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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington , D.C. 20549

FORM 10-K

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For the Fiscal Year Ended December 31, 2021

OR

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For the transition period from ___ to ___

Commission file number: 001-36435

Enzon Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

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Registrant’s telephone number, including area code: (732) 980-4500

Securities registered pursuant to Section 12(b) of the Act:

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Securities registered pursuant to Section 12(g) of the Act:

Common Stock, $0.01 par value

Series A-1 Junior Participating Preferred Stock Purchase Rights

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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. ☐  Yes     ⌧  No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. ☐  Yes     ⌧  No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ⌧  Yes     ☐  No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). ⌧  Yes     ☐  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). ☐  Yes     ☒  No

The aggregate market value of the Common Stock, $0.01 par value per share (“Common Stock”), held by non-affiliates of the registrant was approximately $25,051,961 as of June 30, 2021, based upon the closing sale price quoted on the OTCQX market of the OTC Markets Group, Inc. of $0.66 per share reported for such date. Shares of Common Stock held by each executive officer and director and certain beneficial owners of 10% or more of the Common Stock of the registrant as of June 30, 2021 have been excluded in that such shares may be deemed to be owned by affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

There were 74,214,603 shares of Common Stock issued and outstanding as of February 11, 2022.

DOCUMENTS INCORPORATED BY REFERENCE

If the registrant files a definitive proxy statement relating to its 2022 Annual Meeting of Stockholders with the Commission not later than 120 days after December 31, 2021, portions of such definitive proxy statement will be incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. However, if such definitive proxy statement is not filed with the Commission in such 120-day period, the registrant will file an amendment to this Annual Report on Form 10-K with the Commission not later than the end of such 120-day period to include the information required by Part III of Form 10-K.

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ENZON PHARMACEUTICALS, INC.

2021 Annual Report on Form 10-K

Table of Contents

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Unless the context requires otherwise, references in this Annual Report on Form 10-K to “Enzon,” the “Company,” “we,” “us,” or “our” and similar terms mean Enzon Pharmaceuticals, Inc. and its subsidiaries.

This Annual Report on Form 10-K contains forward-looking statements within the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. All statements contained in this Annual Report on Form 10-K, other than statements that are purely historical, are forward-looking statements. Forward-looking statements can be identified by the use of forward-looking terminology such as “believes,” “expects,” “may,” “will,” “should,” “could,” “potential,” “anticipates,” “estimates,” “plans,” “would,” or “intends” or the negative thereof, or other variations thereof, or comparable terminology, or by discussions of strategy. Forward-looking statements are based upon management’s present expectations, objectives, anticipations, plans, hopes, beliefs, intentions or strategies regarding the future and are subject to risks and uncertainties that could cause actual results, events or developments to be materially different from those indicated in such forward-looking statements, including the risks and uncertainties set forth in Item 1A. Risk Factors of this Annual Report on Form 10-K. These risks and uncertainties should be considered carefully and readers are cautioned not to place undue reliance on such forward-looking statements. We cannot assure that the future results covered by the forward-looking statements will be achieved. All information in this Annual Report on Form 10-K speaks only as of the date of the filing of this report, unless otherwise indicated. We do not intend to update this information to reflect events after the date of this report.

Our website is located at www.enzon.com. Copies of our Annual Reports on Form 10-K, our Quarterly Reports on Form 10-Q, our Current Reports on Form 8-K and our other reports filed with the Securities and Exchange Commission (the “SEC”) can be obtained, free of charge, as soon as reasonably practicable after such material is electronically filed with, or furnished to the SEC, by calling (732) 980-4500, by clicking the SEC Filings link from the Investors and Media page on our website at www.enzon.com or directly from the SEC’s website at www.sec.gov. Our website and the information contained therein or connected thereto are not incorporated into this Annual Report on Form 10-K.

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

FORM 10-K

ENZON PHARMACEUTICALS, INC.

PART I.

Item 1. Business

OVERVIEW

Enzon Pharmaceuticals, Inc. (together with its subsidiaries, the “Company,” “Enzon,” “we” or “us”) is positioned as a public company acquisition vehicle, where we can become an acquisition platform and more fully utilize our net operating loss carryforwards (“NOLs”) and enhance stockholder value.

In September 2020, we initiated a rights offering (the “Rights Offering”) for our common and preferred stock, which closed in October 2020 (see below and Note 13 to our Consolidated Financial Statements), and we realized $43.6 million in gross proceeds. This has enabled us to embark on our plan to realize the value of our approximately $103.4 million NOLs by acquiring potentially profitable businesses or assets. To protect the NOLs, in August 2020, our Board of Directors (the “Board”) adopted a Section 382 rights plan (see Note 12 to our Consolidated Financial Statements).

Historically, we have received royalty revenues from licensing arrangements with other companies primarily related to sales of certain drug products that utilized Enzon’s proprietary technology. In recent years, we have had no clinical operations and limited corporate operations. We have a marketing agreement relating to the drug Vicineum, which, if approved, will potentially generate milestone and royalty payments to us in the future. We cannot assure you that we will earn material future royalties or milestones.

Acquisition Activities

Our Board and our management are actively involved in pursuing, sourcing, reviewing, and evaluating various potential acquisition transactions consistent with our long-term strategy. Our management and our Board have originated a number of potential acquisition opportunities and engaged in discussions with certain potential acquisition targets and financial advisors on behalf of various individual entities, while continuing to evaluate such potential transactions. We will continue to update our stockholders as material developments arise.

Royalty and Milestone Agreements and Revenues

Prior to 2017, we received royalty revenues from sales of PegIntron, which is marketed by Merck & Co., Inc. (“Merck”). In 2020 and 2021 net royalties from PegIntron have not been significant. There is a dispute with Merck regarding royalties (see Note 4 to our Consolidated Financial Statements). We have a licensing agreement regarding SC Oncaspar and certain other drugs.

In 2021, we earned total milestones revenues of approximately $702,000 from Sesen, Inc. (See Note 1 to our Consolidated Financial Statements).

During the years ended December 31, 2021 and 2020, we received a license maintenance fee of approximately $28,000 and $30,000, respectively, from Amgen, Inc. in payment of a worldwide, royalty-free non-exclusive right to license Vicineum.  (See Note 1 to our Consolidated Financial Statements.)

Patents and Intellectual Property Rights

We have a portfolio of issued U.S. patents, many of which have foreign counterparts. Of the patents owned or exclusively licensed by us, one relates to PegIntron. The patent related to PegIntron (peginterferon alfa-2b) expired in the United States in 2016 and expired outside of the United States in 2018 (including any patent term extensions), except for Japan, where the patent expired in 2021, Malaysia, where the patent expired in 2020, and Chile, where it will expire in 2024. Although we believe that our patents provide certain protection from competition and we may be entitled to potential royalty rights and/or milestone payments, we cannot assure you that such patents will be of substantial protection or

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commercial benefit to us, will afford us adequate protection from competing products, or will not be challenged or declared invalid. In addition, we cannot assure you that additional U.S. patents or foreign patent equivalents will be issued to us. At this time, we do not expect to apply for or receive any additional patents.

Patents for individual products extend for varying periods according to the date of patent filing or grant and the legal term of patents in the various countries where patent protection is obtained. Many of our patents have expired or are nearing the end of their patent protection period. The actual protection afforded by a patent, which can vary from country to country, depends upon the type of patent, the scope of its coverage and the availability of legal remedies in the country.

EMPLOYEES AND EXECUTIVE OFFICERS

We currently have no employees. Our executive officer provides services to us on a consulting basis.

Item 1A. Risk Factors

Our business, financial condition and results of operations may be impacted by one or more of the following factors, any of which could cause actual results to vary materially from historical and current results or anticipated future results.

Risks Relating to the Company and its Operations

Our search for a business, company or assets to acquire or in which to invest may be unsuccessful, and we may fail to maximize our return on the proceeds of our Rights Offering and/or realize the value of our NOLs.

We are positioned as a public company acquisition vehicle, where we can become an acquisition platform and more fully utilize our NOLs and enhance stockholder value. We intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our approximately $103.4 million NOLs. However, we do not have any current plans, arrangements or understandings with respect to any acquisitions or investments, and we have not identified any actionable acquisition candidates. We will have significant discretion in the use of the net proceeds of our Rights Offering, and it is possible that we will fail to maximize our return on such proceeds. While we expect that, ultimately, we will be successful in realizing the value of our NOLs, we cannot assure you that we will be able to do so.

The COVID-19 pandemic may continue to disrupt the approval and manufacture of products for which we share the right to receive licensing fees, milestone payments and royalties and may negatively impact our search for an acquisition target, and the business and/or results of operations of any target business that we acquire or in which we invest.

Despite recent progress in the administration of vaccines, both the outbreak of recent variants, including Delta and Omicron, and the related containment measures that have been put in place across the globe, have had and are likely to continue to have a serious adverse impact on the global economy and may adversely affect our business operations. The ongoing global health crisis (including resurgences) resulting from the pandemic have disrupted, and continue to disrupt, the normal operations of many businesses, including restrictions such as the temporary closure or scale-back of business operations and/or the imposition of either quarantine or remote work requirements for employees, either by government order or on a voluntary basis. It is impossible to predict the effect and ultimate impact of the COVID-19 pandemic, as the situation is continually evolving. The COVID-19 pandemic may continue to disrupt the global supply chain and may cause disruptions to our operations, financial condition and prospects.

At the present time, our own business activities have been largely unaffected by COVID-19 restrictions as our workforce is comprised solely of independent contractors who are able to perform their duties remotely. However, these restrictions may impact the third parties who are responsible for obtaining final approval of and manufacturing product candidates for which we share the right to receive licensing fees, milestone payments and royalty revenues. If those third parties are required to curtail their business activities for a significant time, or if global supply chain disruptions impact their ability to procure needed resources, raw materials or components, our right to receive licensing fees, milestone payments or royalties could be materially and adversely affected. Additionally, the development timeline for product candidates that are pending FDA approval could be delayed if the agency is required to shift resources to the review and approval of candidates for treatment of COVID-19.

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In addition, the business and/or results of operations of any potential target business, that we acquire or in which we invest, could be materially and adversely affected. Furthermore, we may be unable to complete any such acquisitions or investments if continued concerns relating to COVID-19 restrict travel, limit the ability to have meetings with potential investors or the target company’s personnel, vendors and service providers are unavailable to negotiate and consummate a transaction in a timely manner or if COVID-19 causes a prolonged economic downturn. The extent to which COVID-19 impacts our search for a business to acquire or in which to invest will depend on future developments, which are highly uncertain and cannot be predicted, including new information which may emerge concerning the severity of COVID-19 and the actions to contain COVID-19 or treat its impact, among others. If the disruptions posed by COVID-19 or other matters of global concern continue for an extensive period of time, our ability to consummate a business acquisition or investment, or the business and/or results of operations of a target business with which we ultimately consummate an acquisition or investment, may be materially adversely affected.

The degree to which the COVID-19 pandemic ultimately impacts our business and results of operations, including our ability to acquire profitable businesses, entities or revenue streams, will depend on future developments beyond our control, including the severity of the pandemic, the extent of actions to contain the virus, availability of a vaccine or other treatment, how quickly and to what extent normal economic and operating conditions can resume and the severity and duration of any global economic recession resulting from the pandemic.

Our sources of revenue are limited and we expect to incur losses for the foreseeable future; while we increased our cash reserve by completing the Rights Offering, unanticipated liabilities and expenses could adversely affect our ability to engage in a public company acquisition or investment, as currently intended, or to continue operations.

We have incurred losses in the current period and have limited sources of revenues. Although we received approximately $43.1 million of net proceeds in the fourth quarter of 2020 from the Rights Offering, which we intend to use to position us as a public company acquisition vehicle, unless and until we can consummate an acquisition or investment that generates income, we do not anticipate generating any additional cash or revenues. We have been informed by Merck that there will likely be no or minimal additional sales of PegIntron and we would likely receive no further significant royalties, although we may remain potentially liable to Merck for product returns and rebates. Based on current estimates, we do not expect any liability for those returns and rebates to be material. Moreover, our right to receive royalty revenues from other products is limited and we currently do not intend to acquire new sources of royalty revenues. For those remaining existing or potential sources of royalty revenue, our licensees may be unable to maintain regulatory approvals for currently licensed products or obtain regulatory approvals for new products. Safety issues could also result in the failure to maintain regulatory approvals or decrease revenues.

While we have substantially reduced our operating expenses in anticipation of the decline in revenues, including ceasing our research and development activities, eliminating our workforce in favor of independent contractors, and discontinuing our significant lease commitments, we may incur unanticipated liabilities or expenses, including expenses to defend unasserted product liability claims or greater than expected liabilities for PegIntron and expenses incurred in our search for a target business to acquire or in which to invest. Any such expenses or liabilities could impact the availability of assets that we expect to use to fund future operations or adversely affect our ability to pay dividends or make distributions to shareholders upon a liquidation of the Company.

We have outsourced all corporate functions, which makes us more dependent on third parties to perform these corporate functions.

We have outsourced all corporate functions, which makes us more dependent on third parties for the performance of these functions. To the extent that we are unable to effectively reallocate employee responsibilities, retain key officers as consultants, maintain effective internal control over financial reporting and effective disclosure controls and procedures, establish and maintain agreements with competent third-party contractors on terms that are acceptable to us, or effectively manage the work performed by any retained third-party contractors, our ability to manage the operations effectively could be compromised.

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While we intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our NOLs, we may be unable to do so and, accordingly, we may be unable to realize our deferred income tax assets.

The ultimate realization of our deferred income tax assets is dependent upon generating future taxable income, executing tax planning strategies, and reversals of existing taxable temporary differences. We have recorded a full valuation allowance against our deferred income tax assets, which may fluctuate as conditions change. While we are positioned as a public company acquisition vehicle and intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our NOLs, we cannot provide any assurance that we will be able to do so.

In addition, our ability to utilize our NOLs to offset our future taxable income and/or to recover previously paid taxes would be limited if we were to undergo an “ownership change” within the meaning of Section 382 of the Internal Revenue Code. In general, an “ownership change” occurs whenever the percentage of the stock of a corporation owned by “5-percent shareholders” (within the meaning of Section 382 of the Internal Revenue Code) increases by more than 50 percentage points over the lowest percentage of the stock of such corporation owned by such “5-percent shareholders” at any time over the testing period.

An ownership change under Section 382 of the Internal Revenue Code would establish an annual limitation to the amount of NOLs we could utilize to offset our taxable income in any single year. The application of these limitations might prevent full utilization of the deferred tax assets attributable to our NOLs. Although we have adopted a Section 382 rights plan in an effort to protect stockholder value by attempting to protect against a possible limitation on our ability to use our NOLs, we cannot assure you that we will not undergo an ownership change within the meaning of Section 382. (See Notes 9 and 12 to the Consolidated Financial Statements.)

Risks Relating to Our Common Stock

Our common stock ranks junior to our Series C Preferred Stock.

With respect to the payment of cash dividends and amount payable in the event our liquidation, dissolution or winding up, our common stock will rank junior to our Series C Non-Convertible Redeemable Preferred Stock (“Series C Preferred Stock”).  This means that, unless full dividends have been (i)  paid, (ii) redeemed in an amount in excess of the initial liquidation value of $1,000 per share of Series C Preferred Stock or (iii) set aside for payment on all outstanding Series C Preferred Stock for all dividends or increases in the liquidation value in excess of the initial liquidation amount of $1,000 of such Series C Preferred Stock, no cash dividends may be declared or paid on our common stock. Likewise, in the event of our voluntary or involuntary liquidation, dissolution or winding up, no distribution of our assets may be made to holders of our common stock until we have paid to the holders of our Series C Preferred Stock the liquidation preference related to such Series C Preferred Stock, plus in each case any accrued and unpaid dividends.

The interests of our significant stockholders may conflict with the interests of other stockholders.

Mr. Carl C. Icahn, directly and indirectly, beneficially owns approximately 49% of the outstanding shares of our common stock, as well as approximately 98% of the outstanding Series C Preferred Stock. Mr. Icahn may have interests that are different from, in addition to or not always consistent with our interests or with the interests of our other common or preferred stockholders. To the extent that conflicts of interest may arise between us and Mr. Icahn and his affiliates, those conflicts may be resolved in a manner adverse to us or our other stockholders. In addition, the existence of significant stockholders may have the effect of making it difficult for, or may discourage or delay, a third party from seeking to acquire a majority of our outstanding common stock, which may adversely affect the market price of our common stock. In addition, such stockholders may exert significant influence over our operations.

The price of our common stock has historically been volatile and may decline significantly if we are unable to consummate a business acquisition or investment.

Historically, the market price of our common stock has fluctuated over a wide range for a variety of reasons, including Company-specific factors and global and industry-wide conditions and events such as the COVID-19 pandemic and resulting recession, as well as the fact that only a few stockholders, in the aggregate, hold more than a majority of our

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common stock, and, therefore, there is a small public float with limited trading activity in our common stock. In the future, the value of our common stock may be impacted by our declining royalty revenues, our ability to monetize our remaining assets, including our NOLs, and any unexpected liabilities or expenses that impact our continued operations, our ability to pay dividends or make distributions to our stockholders and the success of any future activities which we undertake, including our ability to consummate a business acquisition or investment.

In addition, financings that may be available to us under current market conditions frequently involve sales at prices below the prices at which our common stock currently trades on the OTCQX, as well as the issuance of warrants or convertible equity that require exercise or conversion prices that are calculated in the future at a discount to the then market price of our common stock.

Our common stock is quoted on the OTCQX market of the OTC Markets Group, Inc., which has a very limited trading market and, therefore, market liquidity for our common stock is low and our stockholders’ ability to sell their shares of our common stock may be limited.

Our common stock is quoted on the OTCQX market of the OTC Markets Group, Inc. and the quotation of our common stock on the OTCQX market does not assure that a liquid trading market exists or will develop. Stocks traded on the OTCQX market generally have very limited trading volume and exhibit a wider spread between the bid/ask quotations than stocks traded on national exchanges. Moreover, a significant number of institutional investors have investment policies that prohibit them from trading in stocks on the OTCQX marketplace. As a result, investors may find it difficult to dispose of, or to obtain accurate quotations of the price of, our common stock. This significantly limits the liquidity of our common stock and may adversely affect the market price of our common stock.

We do not currently, and are not expected in the future to, meet the listing standards of any national exchange. We presently anticipate that our common stock will continue to be quoted on the OTCQX market. As a result, investors must bear the economic risk of holding their shares of our common stock for an indefinite period of time. In the future, our common stock could become subject to “penny stock” rules which impose additional disclosure requirements on broker-dealers and could further negatively impact market liquidity for our common stock and our stockholders’ ability to sell their shares of our common stock.

The declaration of common stock dividends is within the discretion of our Board, subject to any applicable limitations under Delaware corporate law, as well as the requirements of the Series C Preferred Stock. Our ability to pay dividends in the future depends on, among other things, our fulfillment of the conditions of the Series C Preferred Stock, declining royalty revenues, our ability to acquire other revenue sources and our ability to manage expenses, including costs relating to our ongoing operations.

The declaration of dividends is within the discretion of our Board, subject to any applicable limitations under Delaware corporate law, and, therefore, our Board could decide in the future not to declare dividends. In addition, as described elsewhere, our common stock ranks junior to the Series C Preferred Stock, and we cannot declare or pay cash dividends on our common stock unless we satisfy the dividend requirements of such Series C Preferred Stock. Also, our ability to pay dividends in the future depends on, among other things, our future revenues, including any revenues from existing and any future royalties and/or milestone payments, our ability to acquire other revenue sources and our ability to manage expenses, including costs relating to our ongoing operations. We expect little or no future royalties from existing products for which we have the right to receive royalties. In addition, while we intend to acquire or invest in profitable businesses, entities or revenue streams and we may be entitled to a share of milestone and royalty payments from the approval and sale of Vicineum, we cannot assure you that we will be able to do so or that we will have sufficient royalty or milestone revenues to be able to pay dividends in the future.

We have adopted a Section 382 rights plan, which may discourage a corporate takeover.

On August 14, 2020, our Board of Directors adopted the Section 382 rights plan and declared a dividend distribution of one right for each outstanding share of our common stock to stockholders of record at the close of business on August 24, 2020. Each share of our common stock issued thereafter will also include one right. Each right entitles its holder, under certain circumstances, to purchase from us one one-thousandth of a share of our Series A-1 Junior Participating Preferred Stock at an exercise price of $1.20 per right, subject to adjustment.

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The Board adopted the Section 382 rights plan in an effort to protect stockholder value by attempting to protect against a possible limitation on our ability to use our NOLs. We may utilize these NOLs in certain circumstances to offset future United States taxable income and reduce our United States federal income tax liability. Because the Section 382 rights plan could make it more expensive for a person to acquire a controlling interest in us, it could have the effect of delaying or preventing a change in control even if a change in control was in our stockholders’ interest.

Anti-takeover provisions in our charter documents and under Delaware corporate law may make it more difficult to acquire us, even though such acquisitions may be beneficial to our stockholders.

In addition to our Section 382 rights plan, provisions of our certificate of incorporation and bylaws, as well as provisions of Delaware corporate law, could make it more difficult for a third party to acquire us, even though such acquisitions may be beneficial to our stockholders. These anti-takeover provisions include:

The provisions described above, our Section 382 rights plan and provisions of Delaware corporate law relating to business combinations with interested stockholders, along with the significant amount of common stock beneficially owned by Mr. Icahn, may discourage, delay or prevent a third party from acquiring us. These provisions may also discourage, delay or prevent a third party from acquiring a large portion of our securities, or initiating a tender offer, even if our stockholders might receive a premium for their shares in the acquisition over the then current market price.

Risks Related to the Series C Preferred Stock

In the event of any dissolution, liquidation, or winding up of our Company, we may not be able to make distributions or payments in full to all the holders of the Series C Preferred Stock or, if required, we may not be able to redeem such shares.

The Series C Preferred Stock ranks senior to our common stock, but we may in the future issue one or more series of preferred stock that ranks senior to, junior to or pari passu with our Series C Preferred Stock. In the event of any dissolution, liquidation, winding up or change of control of our Company, we may not be able to make distributions or payments in full to all the holders of the Series C Preferred Stock or, if required, to redeem the Series C Preferred Stock, in which case holders of the Series C Preferred Stock could lose the entire value of their investment.

The dividends on our Series C Preferred Stock can be paid in kind by increasing the liquidation value of the shares of Series C Preferred Stock.

The terms of the Series C Preferred Stock allow dividends on the shares of Series C Preferred Stock to be paid in kind by increasing the liquidation value of the shares of Series C Preferred Stock and, therefore, allow the repayment of the principal and accrued dividends on the Series C Preferred Stock to be deferred until the earliest of the redemption of the Series C Preferred Stock or upon our dissolution, liquidation or winding up. We may not have enough capital to repay the full amount of the principal and accrued dividends when the payment of principal and accrued dividends on the Series C Preferred Stock becomes due.

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The Series C Preferred Stock is equity and is subordinate to our existing and future indebtedness and other liabilities, and your interests may be diluted in the event we issue additional shares of preferred stock.

Shares of the Series C Preferred Stock represent equity interests and do not constitute indebtedness. As such, the Series C Preferred Stock will rank junior to all of our indebtedness and other non-equity claims of our creditors with respect to assets available to satisfy our claims, including in our liquidation, dissolution or winding up. Our future debt may include restrictions on our ability to pay distributions to preferred stockholders. Unlike indebtedness, where principal and interest would customarily be payable on specified due dates, in the case of preferred stock such as the Series C Preferred Stock, dividends are payable only if declared by our Board of Directors (or a duly authorized committee thereof). Our ability to pay dividends on the Series C Preferred Stock may be limited by the terms of our agreements governing future indebtedness and by the provisions of other future agreements.

Subject to limitations prescribed by Delaware law and our charter, our Board of Directors is authorized to issue, from our authorized but unissued shares of capital stock, preferred stock in such classes or series as our Board of Directors may determine and to establish from time to time the number of shares of preferred stock to be included in any such class or series. The issuance of additional shares of Series C Preferred Stock or additional shares of preferred stock designated as ranking on parity with the Series C Preferred Stock would dilute the interests of the holders of shares of the Series C Preferred Stock, and the issuance of shares of any class or series of our capital stock expressly designated as ranking senior to the Series C Preferred Stock or the incurrence of additional indebtedness could affect our ability to pay distributions on, redeem or pay the liquidation preference on the Series C Preferred Stock.

The Series C Preferred Stock is not convertible into common stock.

The Series C Preferred Stock is not convertible into shares of common stock and, therefore, holders of Series C Preferred Stock have no rights with respect to shares of our common stock. In addition, the Series C Preferred Stock accrues dividends at a fixed rate. Accordingly, an increase in market price of our common stock will not necessarily result in an increase in the value of the Series C Preferred Stock. The value of the Series C Preferred Stock may depend more on dividend and interest rates for other preferred stock, commercial paper and other investment alternatives and our actual and perceived ability to pay dividends on, and in the event of dissolution satisfy the liquidation preference with respect to, the Series C Preferred Stock.

Holders of shares of Series C Preferred Stock have no voting rights.

Except as otherwise provided by law, the holders of Series C Preferred Stock have no special voting rights and their consent will not be required for taking any corporate action. As a result, all matters submitted to stockholders will be decided by the vote of holders of our common stock. Holders of Series C Preferred Stock have no ability to influence corporate matters and, as a result, we may take actions that holders of our Series C Preferred Stock do not view as preferable.

There is no public market for the Series C Preferred Stock.

There is no established public trading market for the Series C Preferred Stock, and we do not expect a market to develop. We do not currently intend to apply for listing of the Series C Preferred Stock on any securities exchange or recognized trading system. Purchasers of the Series C Preferred Stock may be unable to resell their shares of Series C Preferred Stock or sell them only at an unfavorable price for an extended period of time, if at all.

 Item 1B. Unresolved Staff Comments

Not applicable.

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Item 2. Properties

We maintain our principal executive offices at 20 Commerce Drive, Suite 135, Cranford, New Jersey, 07016 through a services agreement with Regus Management Group, LLC (“Regus”).

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Item 3. Legal Proceedings

From time to time, we are engaged in litigation arising in the ordinary course of our business. There is currently no pending material litigation to which we are a party or to which any of our property is subject.

Item 4. Mine Safety Disclosures

Not applicable.

PART II.

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Market Information

Since August 9, 2016, our common stock has been quoted for trading on the OTCQX market of the OTC Markets Group, Inc. under the trading symbol “ENZN.”

Over-the-counter market quotations reflect inter-dealer prices, without retail mark-up, markdown or commission and may not represent actual transactions.

Holders

As of February 11, 2022, there were 758 holders of record of our common stock, which does not reflect persons or entities that hold the common stock in nominee or “street” name through various brokerage firms and financial institutions.

Dividends

The declaration of dividends is within the discretion of our Board, subject to any applicable limitations under Delaware corporate law, and therefore our Board could decide in the future not to declare dividends. We did not pay any cash dividends to our common stockholders in 2021 and can provide no assurance that our Board will declare any cash dividends payable to our common stockholders in the future. In addition, as our common stock ranks junior to the Series C Preferred Stock, unless full dividends have been (i)  paid, (ii) redeemed in an amount in excess of the initial liquidation value of $1,000 per share of Series C Preferred Stock or (iii) set aside for payment on all such outstanding Series C Preferred Stock for all dividends or increases in the liquidation value in excess of the initial liquidation amount of $1,000 of such Series C Preferred Stock, no cash dividends may be declared or paid on our common stock. On an annual basis, our Board may, at its sole discretion, cause a dividend with respect to the Series C Preferred Stock to be paid in cash to the holders in an amount equal to 3% of the liquidation preference as in effect at such time. If the dividend is not so paid in cash, the liquidation preference will be adjusted and increased annually by an amount equal to 5% of the liquidation preference per share as in effect at such time, that is not paid in cash to the holders on such date. Also, our ability to pay dividends in the future depends on, among other things, our future revenues from existing royalties and/or milestone payments, our ability to acquire other revenue sources and our ability to manage expenses, including costs relating to our ongoing operations.

Repurchase of Equity Securities

Not applicable.

Item 6. Selected Financial Data

As a smaller reporting company, we are not required to provide the information required by this item.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion of our financial condition and results of operations should be read together with our consolidated financial statements and notes to those statements included elsewhere in this Annual Report on Form 10-K.

Forward-Looking Information and Factors That May Affect Future Results

The following discussion contains forward-looking statements within the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. All statements contained in the following discussion, other than statements that are purely historical, are forward-looking statements. Forward-looking statements can be identified by the use of forward-looking terminology such as “believes,” “expects,” “may,” “will,” “should,” “could,” “potential,” “anticipates,” “estimates,” “plans,” “would,” or “intends” or the negative thereof, or other variations thereof, or comparable terminology, or by discussions of strategy. Forward-looking statements are based upon management’s present expectations, objectives, anticipations, plans, hopes, beliefs, intentions or strategies regarding the future and are subject to risks and uncertainties that could cause actual results, events or developments to be materially different from those indicated in such forward-looking statements, including the risks and uncertainties set forth in Item 1A. Risk Factors. These risks and uncertainties should be considered carefully and readers are cautioned not to place undue reliance on such forward-looking statements. As such, we cannot assure you that the future results covered by the forward-looking statements will be achieved.

The percentage changes throughout the following discussion are based on amounts stated in thousands of dollars.

Overview

During 2020, the Company adopted a Section 382 rights plan and completed a Rights Offering, each as further described below. As a result of the successful completion of the Rights Offering, we are positioned as a public company acquisition vehicle, where we can become an acquisition platform and more fully utilize our NOLs and enhance stockholder value. We intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our approximately $103.4 million NOLs. To date, we have not identified any actionable acquisition candidates and, while we expect that, ultimately, we will be successful in realizing the value of our NOLs, we cannot assure you that we will be able to do so.

In December 2019, an outbreak of a novel strain of coronavirus (COVID-19) was reported in Wuhan, China. Despite recent progress in the administration of vaccines, both the outbreak of recent variants, including Delta and Omicron, and the related containment measures that have been put in place across the globe, have had and are likely to continue to have a serious adverse impact on the global economy and may adversely affect our business operations. The ongoing global health crisis (including resurgences) resulting from the pandemic have disrupted, and continue to disrupt, the normal operations of many businesses, including restrictions such as the temporary closure or scale-back of business operations and/or the imposition of either quarantine or remote work requirements for employees, either by government order or on a voluntary basis. It is impossible to predict the effect and ultimate impact of the COVID-19 pandemic, as the situation is continually evolving. The COVID-19 pandemic may continue to disrupt the global supply chain and may cause disruptions to our operations, financial condition and prospects. At the present time, the Company’s business activities have been largely unaffected by COVID-19 restrictions as the Company’s workforce is comprised solely of independent contractors who are able to perform their duties remotely. However, these restrictions may impact the third parties who are responsible for obtaining final approval of and manufacturing product candidates for which the Company shares the right to receive licensing fees, milestone payments and royalty revenues. If those third parties are required to curtail their business activities for a significant time, or if global supply chain disruptions impact their ability to procure needed resources, raw materials or components, the Company’s right to receive licensing fees, milestone payments or royalties could be materially and adversely affected. Additionally, the development timeline for product candidates being developed by third parties that are pending FDA or other regulatory approval could be delayed if the agency is required to shift resources to the review and approval of candidates for treatment of COVID-19. In addition, the effects of the COVID-19 pandemic may negatively impact our search for a target company,  as well as the business and/or results of operations of any target business that we acquire or in which we invest.

Prior to 2017, the primary source of our royalty revenues was derived from sales of PegIntron, which is marketed by Merck. We currently have no clinical operations and limited corporate operations. We have no intention of resuming

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any clinical development activities. Royalty revenues from sales of PegIntron accounted for (4)% and 42% of our total revenues for the years ended December 31, 2021 and 2020, respectively, net of the effects of Merck’s adjustments for recoupment of previously overpaid royalties.

We have a marketing agreement with Micromet AG, now part of Amgen, Inc. (the “Micromet Agreement”), pursuant to which we may be entitled to certain milestone and royalty payments if Vicineum, a drug being developed by Sesen, Inc., is approved for the treatment of non-muscle invasive bladder cancer. In a press release dated February 16, 2021, Sesen announced that the U.S. Food and Drug Administration (the “FDA”) had accepted for filing Sesen’s Biologic License Application (“BLA”) for Vicineum. The FDA further granted Priority Review, with a target Prescription Drug User Fee Act (“PDUFA”) date for a decision on the BLA of August 18, 2021 Accordingly, we earned a milestone of $409,430 in the first quarter of 2021, all of which was received by June 30, 2021. However, on August 13, 2021, Sesen announced that it had received a Complete Response Letter (“CRL”) from the FDA and that the FDA had determined that it cannot approve the BLA for Vicineum in its present form and had provided recommendations specific to additional clinical/statistical data and analyses in addition to Chemistry, Manufacturing and Controls (“CMA”) issues pertaining to a recent preapproval inspection and product quality. In a press release that Sesen issued on December 9, 2021, it noted that on December 8, 2021 it had a Clinical Type A meeting with the FDA and received greater clarity regarding the requirements for resubmission of the BLA and trial design, which may include a randomized clinical trial assessing the safety and efficacy of Vicineum compared to investigators’ choice of intravesical chemotherapy. In a filing with the U. S. Securities and Exchange Commission (“SEC”) in March 2021, Sesen noted that it had received notice from the European Medicines Agency (“EMA”) that its Marketing Authorization Application (“MMA”) for Vicineum was found to be valid and the review procedure had officially started. Accordingly, we earned and received an additional milestone of $292,284 in the second quarter of 2021. Subsequently, on August 25, 2021, Sesen announced that it had withdrawn its application to market Vicineum in Europe.

Due to the challenges associated with developing and obtaining approval for drug products, and the lack of our involvement in the development and approval process, there is substantial uncertainty as to whether we will receive any milestone or royalty payments under the Micromet Agreement. We will not recognize revenue until all revenue recognition requirements are met.

 We may be entitled to certain potential future milestone payments contingent upon the achievement of certain regulatory approval-related milestones by third-party licensees. We cannot assure you that we will receive any milestone payments resulting from our agreements with any of our third-party licensees or that any sales of related products will be made. We will not recognize revenue from any of our third-party licensees until all revenue recognition requirements are met.

Results of Operations (in thousands of dollars):

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Overview

The following table summarizes our royalties earned in 2021 and 2020:

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Royalties and Milestones Revenues (in thousands of dollars):

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In 2021 and 2020, we earned total net royalties and milestones revenues of approximately $729,000 and $0, respectively, in milestone revenue from Sesen. Separately, in 2021, we were notified by Merck of an approximate $28,000 repayment they believe they are owed of previously-paid royalties on PegIntron. The revenues in 2021 and 2020 were $28,000 and $30,000, respectively, from license fees from Amgen, Inc. in payment of a worldwide, royalty-free non-exclusive right to license Vicineum. In 2020, we also earned $22,000 from royalty revenues from Merck related to sales of PegIntron. Our right to receive royalties on U.S. and European sales of PegIntron expired in 2016 and 2018, respectively, expired in Malaysia in 2020, expired in Japan in 2021 and will expire in Chile in 2024.

At December 31, 2020, we recorded a liability to Merck of approximately $302,000 based primarily on Merck’s assertions regarding recoupments related to prior returns and rebates. During the year ended December 31, 2021, additional recoupments claimed by Merck related to PegIntron were approximately $29,000. As such, as asserted by Merck, the Company’s liability to Merck was $331,000 at December 31, 2021, as discussed in Note 4 to the Consolidated Financial Statements.  During the year ended December 31, 2020, net royalties from PegIntron were approximately $22,000.

We believe that we will receive little or no additional royalties from Merck and may incur additional chargebacks from returns and rebates in amounts that, based on current estimates, are not believed to be material. As reported by Merck, in recent years, sales declines were driven by lower volumes in nearly all regions, as the availability of new therapeutic options resulted in continued loss of market share.

General and Administrative Expenses (in thousands of dollars):

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For the year ended December 31, 2021, general and administrative expenses were approximately $1,170,000, a decrease of approximately $187,000 (14%) from $1,357,000 in the prior year. The change in 2021 from 2020 was primarily from a decrease in legal, consulting, and contracted services fees, as partially offset by an increase in insurance expenses. In particular, legal and other fees associated with the Section 382 rights plan and issues surrounding proxy filings and the annual meeting contributed significantly to the 2020 general and administrative expenses.

In 2021 and 2020, general and administrative expenses consisted primarily of insurance expenses, consulting fees for executive services, outside professional services for accounting, audit, tax and legal services.

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Income Taxes

As a result of our expenses exceeding our royalty and milestone income for the year ended December 31, 2021, we incurred approximately $468,000 in taxable loss before utilization of NOLs. We utilized none of our NOLs due to the taxable loss position. Due to the valuation allowance placed on our deferred tax assets, the deferred tax expense resulting from the usage and/or expiration of deferred tax assets was offset by a corresponding deferred tax benefit from a reduction in valuation allowance, and we recorded no deferred tax expense during the year ended December 31, 2021. We are projecting future tax losses and have recorded a full valuation allowance against our remaining deferred tax assets as of December 31, 2021, as we currently believe it is more likely than not that these assets will not be realized. However, we intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our approximately $103.4 million NOLs. While we anticipate that, ultimately, we will be successful in realizing the value of our NOLs, we cannot assure you that we will be able to do so.

Our management will continue to assess the need for this valuation allowance and will make adjustments when appropriate. Additionally, our management believes that our NOLs will not be limited by any changes in the Company’s ownership as a result of the successful completion of the Rights Offering. (See Note 13 to the Consolidated Financial Statements.)

These projections and beliefs are based upon a variety of estimates and numerous assumptions made by our management with respect to, among other things, forecasted sales of the drug products for which we have the right to receive royalties, our ability to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our NOLs and other matters, many of which are difficult to predict, are subject to significant uncertainties and are beyond our control. As a result, we cannot assure you that the estimates and assumptions upon which these projections and beliefs are based will prove accurate, that the projected results will be realized or that the actual results will not be substantially higher or lower than projected.

Section 382 Rights Plan

On August 14, 2020, in an effort to protect stockholder value by attempting to protect against a possible limitation on our ability to use our NOLs, our Board of Directors adopted a Section 382 rights plan and declared a dividend distribution of one right for each outstanding share of the Company’s common stock to stockholders of record at the close of business on August 24, 2020. Accordingly, holders of the Company’s common stock own one preferred stock purchase right for each share of common stock owned by such holder. The rights are not immediately exercisable and will become exercisable only upon the occurrence of certain events as set forth in the Section 382 rights plan. If the rights become exercisable, each right would initially represent the right to purchase from us one one-thousandth of a share of our Series A-1 Junior Participating Preferred Stock, par value $0.01 per share, for a purchase price of $1.20 per right. If issued, each fractional share of Series A-1 Junior Participating Preferred Stock would give the stockholder approximately the same dividend, voting and liquidation rights as does one share of the Company’s common stock. However, prior to exercise, a right does not give its holder any rights as a stockholder of the Company, including any dividend, voting or liquidation rights. The rights will expire on the earliest of (i) the close of business on June 2. 2024 (unless that date is advanced or extended by the Board of Directors), (ii) the time at which the rights are redeemed or exchanged under the Section 382 rights plan, (iii) the close of business on the day of repeal of Section 382 of the Internal Revenue Code or any successor statute and (iv) the close of business on the first day of a taxable year of the Company to which our Board of Directors determines that no NOLs may be carried forward.

Rights Offering

On September 1, 2020, our Board of Directors approved the Rights Offering consisting of shares of Series C Preferred Stock and shares of the Company’s common stock. On October 9, 2020, the Rights Offering was completed and, as a result, we realized gross proceeds of approximately $43.6 million, issued 40,000 shares of Series C Preferred Stock and 30,000,000 shares of common stock such that there is currently an aggregate of 40,000 shares of Series C Preferred Stock and 74,214,603 shares of common stock outstanding. (See Note 13 to the Consolidated Financial Statements.)

With regard to the Series C Preferred Stock, on an annual basis, the Company’s Board of Directors may, at its sole discretion, cause a dividend with respect to the Series C Preferred Stock to be paid in cash to the holders in an amount

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equal to 3% of the liquidation preference as in effect at such time (initially $1,000 per share). If the dividend is not so paid in cash, the liquidation preference is adjusted and increased annually by an amount equal to 5% of the liquidation preference per share as in effect at such time, that is not paid in cash to the holders on such date. Holders of Series C Preferred Stock do not have any voting rights and the Series C Preferred Stock is not convertible into shares of our common stock. The initial liquidation value of the Series C Preferred Stock was $1,000 per share. No dividends have been declared or paid on the Series C Preferred Stock. On or after November 1, 2022, we may redeem the Series C Preferred Stock at any time, in whole or in part, for an amount based on the liquidation preference per share as in effect at such time. Holders of Series C Preferred Stock have the right to demand that we redeem their shares in the event that we undergo a change of control.

We believe that the completion of the Rights Offering will not limit the use of our NOLs due to any Section 382 limitations.

The Company’s Board of Directors did not declare a dividend on the Series C Preferred Stock as of December 31, 2021 or 2020. Accordingly, the liquidation value at December 31, 2021 and 2020 was $1,062 and $1,012 per share, respectively. (See Note 14 to the Consolidated Financial Statements.)

Liquidity and Capital Resources

Our current source of liquidity is our existing cash on hand, which includes the approximately $43.6 million of gross proceeds from our Rights Offering. (See Note 13 to the Consolidated Financial Statements.) While we no longer have any research and development activities, we continue to retain rights to receive royalties and milestone payments from existing licensing arrangements with other companies and, accordingly, we may be entitled to a share of milestone and royalty payments from the approval and sale of Vicineum, We believe that our existing cash on hand will be sufficient to fund our operations, at least, through February 2023. Our future royalty revenues are expected to be de minimis over the next several years and we cannot assure you that we will receive any royalty, milestone or other revenues.

While we are positioned as a public company acquisition vehicle, where we can become an acquisition platform and more fully utilize our NOLs and enhance stockholder value, we cannot assure you that we will succeed in making acquisitions that are profitable and that will enable us to utilize our NOLs.

Cash provided by operating activities represents net loss, as adjusted for certain non-cash items including the effect of changes in operating assets and liabilities. Cash used in operating activities during 2021 was $501,000, as compared to cash used in operating activities of $380,000 in 2020. The decrease of approximately $121,000 was primarily attributable to our collection of a $970,000 tax refund receivable during 2020, offset by an approximately $843,000 decrease in our net loss.

No cash was provided by financing activities in 2021, as compared to approximately $43.1 million provided by financing activities in 2020, attributable entirely to the net proceeds from the Rights Offering in October 2020, offset by the payment of $0.5 million of offering-related costs.

The net effect of the foregoing was a decrease of cash of approximately $0.5 million, from $48.1 million at December 31, 2020 to $47.6 million at December 31, 2021.

Off-Balance Sheet Arrangements

We do not participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow limited purposes. As of December 31, 2021, we were not involved in any off-balance sheet special purpose entity transactions.

Critical Accounting Policies and Estimates

A critical accounting policy is one that is both important to the portrayal of a company’s financial condition and results of operations and requires management’s most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

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Our consolidated financial statements are presented in accordance with accounting principles that are generally accepted in the U.S. (“U.S. GAAP”). All applicable U.S. GAAP accounting standards effective as of December 31, 2021 have been taken into consideration in preparing the consolidated financial statements. The preparation of the consolidated financial statements requires estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. Some of those estimates are subjective and complex, and, consequently, actual results could differ from those estimates. The following accounting policies and estimates have been highlighted as significant because changes to certain judgments and assumptions inherent in these policies could affect our consolidated financial statements.

We base our estimates, to the extent possible, on historical experience. Historical information is modified as appropriate based on current business factors and various assumptions that we believe are necessary to form a basis for making judgments about the carrying value of assets and liabilities. We evaluate our estimates on an ongoing basis and make changes when necessary. Actual results could differ from our estimates.

Revenues

Royalties under our agreements with third parties and pursuant to the sale of our former specialty pharmaceutical business are recognized when reasonably determinable and earned through the sale of the product by the third party and collection is reasonably assured. Notification from the third-party licensee of the royalties earned under the license agreement is the basis for royalty revenue recognition. This information generally is received from the licensees in the quarter subsequent to the period in which the sales occur.

Contingent payments due under the Asset Purchase Agreement for the sale of our former specialty pharmaceutical business are recognized as income when the milestone has been achieved and collection is assured, such payments are non-refundable and no further effort is required on our part or the other party to complete the earning process.

Income Taxes

Under the asset and liability method of accounting for income taxes, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. A valuation allowance on net deferred tax assets is provided for when it is more likely than not that some portion or all of the deferred tax assets will not be realized. As of December 31, 2021, we believe, based on our projections, that at this time it is more likely than not that our net deferred tax assets, including our net operating losses from operating activities, will not be realized. We are positioned as a public company acquisition vehicle, where we can become an acquisition platform and more fully utilize our NOLs. We intend to acquire profitable businesses, entities or revenue streams that will generate sufficient income so that we can utilize our approximately $103.4 million NOLs. At this time, however, we cannot assure you that we will be successful in doing so. Accordingly, our management will continue to assess the need for this valuation allowance and will make adjustments when appropriate. Additionally, our management believes that our NOLs will not be limited by any changes in our ownership as a result of the successful completion of the Rights Offering (See Note 13 to the Consolidated Financial Statements).

We recognize the benefit of an uncertain tax position that we have taken or expect to take on the income tax returns we file if it is more likely than not that we will be able to sustain our position.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

As a smaller reporting company, we are not required to provide the information required by this item.

Item 8. Financial Statements and Supplementary Data

Financial statements and notes thereto appear on pages F-1 to F-17 of this Annual Report on Form 10-K.

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

(a)Evaluation of Disclosure Controls and Procedures

Our management, under the direction of our Principal Executive Officer and Principal Financial Officer, who is the same individual, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Exchange Act of 1934, as amended (the “Exchange Act”), as of December 31, 2021. Disclosure controls and procedures are designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and that such information is accumulated and communicated to management, including the Principal Executive Officer and Principal Financial Officer, to allow timely decisions regarding required disclosures. Based on that evaluation, our Principal Executive Officer and Principal Financial Officer concluded that our disclosure controls and procedures were effective as of December 31, 2021.

(b)Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting, as such term is defined in Rules 13a-15(f) or 15d-15(f) under the Exchange Act, during the quarter ended December 31, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

(c)Management’s Report on Internal Control over Financial Reporting

It is the responsibility of the management of Enzon Pharmaceuticals, Inc. and Subsidiaries to establish and maintain adequate internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act). Internal control over financial reporting is a process designed by, or under the supervision of, our Principal Executive Officer and Principal Financial Officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles, and includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of Enzon; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of consolidated financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of Enzon are being made only in accordance with authorizations of management and directors of Enzon; and (iii) provide reasonable assurance regarding the prevention or timely detection of unauthorized acquisition, use or disposition of Enzon’s assets that could have a material effect on the consolidated financial statements of Enzon.

Under the supervision and with the participation of our management, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on criteria established in “Internal Control—Integrated Framework - 2013” issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Our management concluded that as of December 31, 2021 our internal control over financial reporting was effective based on those criteria.

(d)Limitations on the Effectiveness of Controls

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

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Item 9B. Other Information

On February 24, 2022, the Company entered into a revised consulting agreement with Richard L. Feinstein, the Company’s Chief Executive Officer, Chief Financial Officer and Secretary. The agreement provides for Mr. Feinstein’s consulting fee to be set at $200,000 per year and an incentive of up to 25% of the fee at the discretion of our Board based on the Company’s and Mr. Feinstein’s performance. A copy of the revised consulting agreement is attached hereto as Exhibit 3.5 and incorporated herein by reference.

In addition, on February 24, 2022, our Board approved an amendment to the Company’s Second Amended and Restated By-Laws to provide that our Board shall no longer require at least three directors but can consist of at least one director. The amendment to the Second Amended and Restated By-Laws is attached hereto as Exhibit 10.7 and incorporated herein by reference.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

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PART III.

Item 10. Directors, Executive Officers and Corporate Governance

If we file a definitive proxy statement relating to our 2022 Annual Meeting of Stockholders with the SEC not later than 120 days after December 31, 2021, the information required by this Item 10 is incorporated herein by reference to such definitive proxy statement. However, if such definitive proxy statement is not filed with the SEC in such 120-day period, we will file an amendment to this Annual Report on Form 10-K with the SEC not later than 120 days after December 31, 2021 to include the information required by this Item 10.

Item 11. Executive Compensation

If we file a definitive proxy statement relating to our 2022 Annual Meeting of Stockholders with the SEC not later than 120 days after December 31, 2021, the information required by this Item 11 is incorporated herein by reference to such definitive proxy statement. However, if such definitive proxy statement is not filed with the SEC in such 120-day period, we will file an amendment to this Annual Report on Form 10-K with the SEC not later than 120 days after December 31, 2021 to include the information required by this Item 11.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

If we file a definitive proxy statement relating to our 2022 Annual Meeting of Stockholders with the SEC not later than 120 days after December 31, 2021, the information required by this Item 12 is incorporated herein by reference to such definitive proxy statement. However, if such definitive proxy statement is not filed with the SEC in such 120-day period, we will file an amendment to this Annual Report on Form 10-K with the SEC not later than 120 days after December 31, 2021 to include the information required by this Item 12.

Item 13. Certain Relationships and Related Transactions, and Director Independence

If we file a definitive proxy statement relating to our 2022 Annual Meeting of Stockholders with the SEC not later than 120 days after December 31, 2021, the information required by this Item 13 is incorporated herein by reference to such definitive proxy statement. However, if such definitive proxy statement is not filed with the SEC in such 120-day period, we will file an amendment to this Annual Report on Form 10-K with the SEC not later than 120 days after December 31, 2021 to include the information required by this Item 13.

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Item 14. Principal Accounting Fees and Services

If we file a definitive proxy statement relating to our 2022 Annual Meeting of Stockholders with the SEC not later than 120 days after December 31, 2021, the information required by this Item 14 is incorporated herein by reference to such definitive proxy statement. However, if such definitive proxy statement is not filed with the SEC in such 120-day period, we will file an amendment to this Annual Report on Form 10-K with the SEC not later than 120 days after December 31, 2021 to include the information required by this Item 14.

PART IV

Item 15. Exhibits, Financial Statement Schedules

(a)(1), (a)(2) and (c). The response to this portion of Item 15 is submitted as a separate section of this report commencing on page F-1.

(a)(3) and (b). Exhibits (numbered in accordance with Item 601 of Regulation S-K).

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+Filed herewith

Referenced exhibit was previously filed with the SEC as an exhibit to the Company’s filing indicated below and is incorporated herein by reference to that filing:

(2)Annual Report on Form 10-K for the year ended December 31, 2012 filed March 18, 2013

(3)Annual Report on Form 10-K for the fiscal year ended June 30, 2002 filed on September 26, 2002

(4)Current Report on Form 8-K filed August 14, 2020

(5)Current Report on Form 8-K filed September 23, 2020

(6)Current Report on Form 8-K filed June 8, 2021

(7)Quarterly report on Form 10-Q for the quarter ended June 30, 2013 filed August 6, 2013

(8)Annual Report on Form 10-K for the fiscal year ended December 31, 2018 filed on February 21, 2019

(9)Current Report on Form 8-K filed September 1, 2020

Item 16. Form 10-K Summary

None.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

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ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

Index

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F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Enzon Pharmaceuticals, Inc. and Subsidiaries

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Enzon Pharmaceuticals, Inc. and Subsidiaries (the “Company”) as of December 31, 2021 and 2020, and the related consolidated statements of operations, mezzanine equity and stockholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2021 and 2020, and the consolidated results of their operations and their cash flows for each of the years then ended, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below arises from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Assessment of realizability of deferred tax assets

As discussed in Note 9 to the consolidated financial statements, the Company records a valuation allowance based on the assessment of the realizability of the Company’s deferred tax assets. For the year ended December 31, 2021, the Company had deferred tax assets before valuation allowances of $38.2 million. As of December 31, 2021, the Company has recognized a full valuation allowance on the deferred tax assets. In assessing the realizability of deferred tax assets the Company must assess its tax planning strategies, enacted and effective tax law considerations, and whether sufficient future taxable income will be generated to support the realization of the existing deferred tax assets before expiration, using assumptions about Company-specific conditions and events.

F-2

We identified the assessment of realizability of deferred tax assets as a critical audit matter due to the significant judgment and estimation required by management in their assessment. This in turn led to a high degree of auditor subjectivity and significant audit effort was required in performing our procedures and evaluating audit evidence relating to estimates and assumptions made by management.

Addressing the matter involved performing procedures and evaluating audit evidence, in connection with forming our overall opinion on the consolidated financial statements. We obtained an understanding and evaluated the design of controls over the valuation of deferred taxes. Our procedures also included, among others, an evaluation of: (a) the expiration dates of certain deferred tax assets, primarily federal and state net operating loss carryforwards, (b) whether the Company may have experienced an ownership change resulting in annual limitation of net operating loss carryforwards, and (c) the assumptions used by the Company to develop projections of future taxable income by income tax jurisdiction and tested the completeness and accuracy of the underlying data used in the projections. We compared the projections of future taxable income with the actual results of prior periods, as well as management’s consideration of current industry and economic trends. We also compared the projections of future taxable income with other forecasted financial information prepared by the Company. These procedures also included, among others, the involvement of professionals with specialized skills and knowledge to assist in considering whether management demonstrated their ability and intent in executing planned strategies, including the reasonableness of the application of enacted and effective tax law.

/s/ EisnerAmper LLP

We have served as the Company’s auditor since 2013.

EISNERAMPER LLP

Philadelphia, Pennsylvania

February 25, 2022

F-3

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share amounts)

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The accompanying notes are an integral part of these consolidated financial statements.

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F-4

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

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The accompanying notes are an integral part of these consolidated financial statements.

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F-5

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS’ EQUITY

(In thousands)

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The accompanying notes are an integral part of these consolidated financial statements.

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F-6

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

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The accompanying notes are an integral part of these consolidated financial statements.

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F-7

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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F-8

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-9

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-10

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-11

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-12

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-13

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-14

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-15

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-16

ENZON PHARMACEUTICALS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

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F-17