UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K/A

Amendment No. 1

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2017

OR

FOR THE TRANSITION PERIOD FROM                 TO                 

COMMISSION FILE NUMBER: 814-00849

SOLAR SENIOR CAPITAL LTD.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 993-1670

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

Securities registered pursuant to Section 12(g) of the Act: None

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 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 Securities 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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☐    No  ☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ☒

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.

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 is a shell company (as defined in Rule 12b-2 of the Act)    Yes  ☐    No  ☒

The aggregate market value of common stock held by non-affiliates of the Registrant on June 30, 2017 based on the closing price on that date of $16.74 on the NASDAQ Global Select Market was approximately $253.4 million. For the purposes of calculating this amount only, all directors and executive officers of the Registrant have been treated as affiliates. There were 16,040,485 shares of the Registrant’s common stock outstanding as of April 24, 2018.

EXPLANATORY NOTE

This Amendment No. 1 on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended December 31, 2017, originally filed with the Securities and Exchange Commission on February 22, 2018 (the “Original Filing”). The sole purpose of this Amendment is to include Part III information in our Form 10-K because we have chosen not to file a definitive proxy statement containing such information within 120 days after the end of the fiscal year covered by the Original Filing. Therefore, we are including information previously omitted from Items 10, 11, 12, 13 and 14 of Part III of the Original Filing, in reliance on General Instruction G(3) to Form 10-K, which provides that registrants may incorporate by reference certain information from a definitive proxy statement filed with the SEC within 120 days after fiscal year end.

For purposes of this Amendment, and in accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended, Part III, Items 10 through 14 of the Original Filing have been amended and restated in their entirety, and Part IV, Item 15 of the Original Filing is hereby amended. Updated certifications of our principal executive officer and principal financial officer are included as exhibits to this Form 10-K/A.

In addition, the reference on the cover of the Original Filing to the incorporation by reference to portions of our definitive proxy statement into Part III of the Original Filing is hereby deleted. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Filing and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Filing.

SOLAR SENIOR CAPITAL LTD.

FORM 10-K/A

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2017

TABLE OF CONTENTS

PART III

Information about Directors

Certain information with respect to Solar Senior Capital Ltd.’s (the “Company” or “Solar Senior Capital”) directors is set forth below, including their names, ages, a brief description of their recent business experience, including present occupations and employment, certain directorships that each person holds, the year in which each person became a director of the Company, and a discussion of their particular experience, qualifications, attributes or skills that lead the Company to conclude that such individual should serve as a director of the Company, in light of the Company’s business and structure. There were no legal proceedings of the type described in Item 401(f)(7) and (8) of Regulation S-K in the past 10 years against any of the directors, director nominees, or officers of the Company and none are currently pending. There is no agreement or understanding between any of the Company’s directors or officers pursuant to which they were selected as directors or officers and the Company or any other person or entity.

Mr. Gross is an “interested person” of Solar Senior Capital Ltd. as defined in the Investment Company Act of 1940 due to his position as the Chief Executive Officer and President of the Company and a managing member of Solar Capital Partners, LLC (“Solar Capital Partners”) the Company’s investment adviser. Mr. Spohler is an “interested person” of the Company as defined in the 1940 Act due to his position as the Chief Operating Officer of the Company and a managing member of Solar Capital Partners, the Company’s investment adviser. Each of Mr. Wachter, Mr. Hochberg and Mr. Potter is not an “interested person” of the Company as defined in the 1940 Act.

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Mr. Gross’ intimate knowledge of the business and operations of Solar Capital Partners, extensive familiarity with the financial industry and the investment management process in particular, and experience as a director of other public and private companies not only gives the board of directors valuable insight but also positions him well to continue to serve as the Chairman of our board of directors.

Mr. Spohler’s depth of experience in managerial positions in investment management, leveraged finance and financial services, as well as his intimate knowledge of Solar Senior Capital’s business and operations, gives the board of directors valuable industry-specific knowledge and expertise on these and other matters.

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Mr. Potter’s experience practicing as a corporate lawyer provides valuable insight to the board of directors on regulatory and risk management issues. In addition, his tenure in private equity and other investments and service as a director of both public and private companies provide industry-specific knowledge and expertise to the board of directors.

Mr. Wachter’s extensive knowledge of private equity and investment banking provides the board of directors with the valuable insight of an experienced financial manager.

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Mr. Hochberg’s varied experience in investing in medical technology companies provides the board of directors with particular knowledge of this field, and his role as chairman of other companies’ board of directors brings the perspective of a knowledgeable corporate leader.

Information about Executive Officers Who Are Not Directors

The following information pertains to our executive officers who are not directors of the Company.

Audit Committee

The Audit Committee operates pursuant to a charter approved by our board of directors, a copy of which is available on our website at http://www.solarseniorcap.com. The charter sets forth the responsibilities of the Audit Committee. The Audit Committee’s responsibilities include selecting the independent registered public accounting firm for the Company, reviewing with such independent registered public accounting firm the planning, scope and results of their audit of the Company’s financial statements, pre-approving the fees for services performed, reviewing with the independent registered public accounting firm the adequacy of internal control systems, reviewing the Company’s annual financial statements and periodic filings and receiving the Company’s audit reports and financial statements. The Audit Committee also establishes guidelines and makes recommendations to our board of directors regarding the valuation of our investments. The Audit Committee is responsible for aiding our board of directors in determining the fair value of debt and equity securities that are not publicly traded or for which current market values are not readily available. The board of directors and Audit Committee utilize the services of nationally recognized third-party valuation firms to help determine the fair value of these securities. The Audit Committee is currently composed of Messrs. Hochberg, Wachter and Potter,

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all of whom are considered independent under the rules of the NASDAQ Stock Market and are not “interested persons” of the Company as that term is defined in Section 2(a)(19) of the 1940 Act. Mr. Hochberg serves as Chairman of the Audit Committee. Our board of directors has determined that Mr. Hochberg is an “audit committee financial expert” as that term is defined under Item 407 of Regulation S-K, as promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Mr. Hochberg meets the current independence and experience requirements of Rule 10A-3 of the Exchange Act.

Communication with the Board of Directors

Stockholders with questions about the Company are encouraged to contact the Company’s investor relations department. However, if stockholders believe that their questions have not been addressed, they may communicate with the Company’s board of directors by sending their communications to Solar Senior Capital Ltd., c/o Richard L. Peteka, Corporate Secretary, 500 Park Avenue, New York, New York 10022. All stockholder communications received in this manner will be delivered to one or more members of the board of directors.

Section 16(a) Beneficial Ownership Reporting Compliance

Pursuant to Section 16(a) of the Exchange Act, the Company’s directors and executive officers, and any persons holding more than 10% of its common stock, are required to report their beneficial ownership and any changes therein to the SEC and the Company. Specific due dates for those reports have been established, and the Company is required to report herein any failure to file such reports by those due dates. Based solely on a review of copies of such reports and written representations delivered to the Company by such persons, the Company believes that there were no violations of Section 16(a) by such persons during the fiscal year ended December 31, 2017.

Code of Ethics

The Company has adopted a code of ethics that applies to, among others, its senior officers, including its Chief Executive Officer and its Chief Financial Officer, as well as every officer, director and employee of the Company. The Company’s code of ethics can be accessed via its website at http://www.solarseniorcap.com. The Company intends to disclose amendments to or waivers from a required provision of the code of ethics on Form 8-K.

Nomination of Directors

There have been no material changes to the procedures by which stockholders may recommend nominees to our Board of Directors implemented since the filing of our Proxy Statement for our 2017 Annual Meeting of Stockholders.

Compensation of Executive Officers

None of our officers receives direct compensation from the Company. As a result, we do not engage any compensation consultants. Mr. Gross, our Chief Executive Officer and President, and Mr. Spohler, our Chief Operating Officer, through their ownership interest in Solar Capital Partners, our investment adviser, are entitled to a portion of any profits earned by Solar Capital Partners, which includes any fees payable by us to Solar Capital Partners under the terms of the Advisory Agreement, less expenses incurred by Solar Capital Partners in performing its services under the Advisory Agreement. Messrs. Gross and Spohler do not receive any additional compensation from Solar Capital Partners in connection with the management of our portfolio.

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Mr. Peteka, our Chief Financial Officer, Treasurer and Secretary and, through Alaric Compliance Services, LLC, Guy Talarico, our Chief Compliance Officer, are paid by Solar Capital Management, LLC (“Solar Capital Management”) our administrator, subject to reimbursement by us of an allocable portion of such compensation for services rendered by such persons to the Company. To the extent that Solar Capital Management outsources any of its functions, we will pay the fees associated with such functions on a direct basis without profit to Solar Capital Management.

Compensation of Directors

The following table sets forth compensation of the Company’s directors, for the year ended December 31, 2017.

Our independent directors’ annual fee is $50,000. The independent directors also receive $1,250 ($500 if participating telephonically) plus reimbursement of reasonable out-of-pocket expenses incurred in connection with attending each board meeting and $500 plus reimbursement of reasonable out-of-pocket expenses incurred in connection with each committee meeting attended. In addition, the Chairman of the Audit Committee receives an annual fee of $3,750, the Chairman of the Nominating and Corporate Governance Committee receives an annual fee of $1,250 and the Chairman of the Compensation Committee receives an annual fee of $1,250. Further, we purchase directors’ and officers’ liability insurance on behalf of our directors and officers. In addition, no compensation was paid to directors who are interested persons of the Company as defined in the 1940 Act.

Compensation Committee

The Compensation Committee operates pursuant to a charter approved by our board of directors, a copy of which is available on our website at http://www.solarseniorcap.com. The charter sets forth the responsibilities of the Compensation Committee. The Compensation Committee is responsible for reviewing and recommending for approval to our board of directors the Company’s First Amended and Restated Investment Advisory and Management Agreement with Solar Capital Partners (the “Advisory Agreement”) and the Company’s Administration Agreement with Solar Capital Management. In addition, although we do not directly compensate our executive officers currently, to the extent that we do so in the future, the Compensation Committee would also be responsible for reviewing and evaluating their compensation and making recommendations to the board of directors regarding their compensation. Lastly, the Compensation Committee would produce a report on our executive compensation practices and policies for inclusion in our proxy statement if required by applicable proxy rules and regulations and, if applicable, make recommendations to the board of directors with matters related to compensation generally. The Compensation Committee has the authority to engage compensation consultants and to delegate their duties and responsibilities to a member or to a subcommittee of the Compensation Committee. The members of the Compensation Committee are Messrs. Hochberg, Wachter and

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Potter, all of whom are considered independent under the rules of the NASDAQ Stock Market and are not “interested persons” of the Company as that term is defined in Section 2(a)(19) of the 1940 Act. Mr. Potter serves as Chairman of the Compensation Committee.

Compensation Committee Interlocks and Insider Participation

During fiscal year 2017 none of the Company’s executive officers served on the board of directors (or a compensation committee thereof or other board committee performing equivalent functions) of any entities that had one or more executive officers serve on the Compensation Committee of the Company or on the Board of Directors of the Company. No current or past executive officers of the Company or its affiliates serve on the Company’s Compensation Committee.

Compensation Committee Report

Currently, none of our executive officers are compensated by the Company and as such the Compensation Committee is not required to produce a report on executive officer compensation for inclusion in our annual report on Form 10-K.

The following table sets forth, as of April 24, 2018, the beneficial ownership of each current director, the nominees for directors, the Company’s executive officers, each person known to us to beneficially own 5% or more of the outstanding shares of our common stock, and the executive officers and directors as a group.

Beneficial ownership is determined in accordance with the rules of the Securities and Exchange Commission (“SEC”) and includes voting or investment power with respect to the securities. Ownership information for those persons who beneficially own 5% or more of our shares of common stock is based upon reports filed by such persons with the SEC and other information obtained from such persons, if available.

Unless otherwise indicated, the Company believes that each beneficial owner set forth in the table has sole voting and investment power and has the same address as the Company. Our address is 500 Park Avenue, New York, New York 10022.

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Set forth below is the dollar range of equity securities beneficially owned by each of our directors as of April 24, 2018. We are not part of a “family of investment companies,” as that term is defined in the 1940 Act.

Certain Relationships and Transactions

We have entered into the Advisory Agreement with Solar Capital Partners. Mr. Gross, our Chairman, Chief Executive Officer and President, and Mr. Spohler, our Chief Operating Officer and board member, are managing members and senior investment professionals of, and have financial and controlling interests in, Solar Capital Partners. In addition, Mr. Peteka, our Chief Financial Officer, Treasurer and Secretary, serves as the Chief Financial Officer for Solar Capital Partners.

Solar Capital Partners and its affiliates may also manage other funds in the future that may have investment mandates that are similar, in whole and in part, with ours. For example, Solar Capital Partners presently serves as

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investment adviser to Solar Capital Ltd., a publicly traded BDC, which focuses on investing primarily in senior secured loans, mezzanine loans and equity securities. In addition, Michael S. Gross, our Chairman and Chief Executive Officer, Bruce Spohler, our Chief Operating Officer, and Richard L. Peteka, our Chief Financial Officer, serve in similar capacities for Solar Capital Ltd.

Solar Capital Partners and certain investment advisory affiliates may determine that an investment is appropriate for us and for one or more of those other funds. In such event, depending on the availability of such investment and other appropriate factors, Solar Capital Partners or its affiliates may determine that we should invest side-by-side with one or more other funds. Any such investments will be made only to the extent permitted by applicable law and interpretive positions of the SEC and its staff, and consistent with Solar Capital Partners’ allocation procedures.

Related party transactions may occur among Solar Senior Capital Ltd. and Gemino Healthcare Finance, LLC, First Lien Loan Program LLC, NorthMill LLC and FLLP 2015-1, LLC. These transactions may occur in the normal course of business. No administrative fees are paid to Solar Capital Partners by Gemino Healthcare Finance, LLC, NorthMill LLC or First Lien Loan Program LLC.

In addition, we have adopted a formal code of ethics that governs the conduct of our officers and directors. Our officers and directors also remain subject to the duties imposed by both the 1940 Act and the Maryland General Corporation Law.

Regulatory restrictions limit our ability to invest in any portfolio company in which any affiliate currently has an investment. The Company obtained an exemptive order from the SEC on July 28, 2014 (the “Exemptive Order”). The Exemptive Order permitted us to participate in negotiated co-investment transactions with certain affiliates, each of whose investment adviser is Solar Capital Partners, in a manner consistent with our investment objective, positions, policies, strategies and restrictions as well as regulatory requirements and other pertinent factors, and pursuant to the conditions to the Exemptive Order. On June 13, 2017, the Company, Solar Capital Ltd., and Solar Capital Partners received an exemptive order that supersedes the Exemptive Order (the “New Exemptive Order”) and extends the relief granted in the Exemptive Order such that it no longer applies to certain affiliates only if their respective investment adviser is Solar Capital Partners, but also applies to certain affiliates whose investment adviser is an investment adviser that controls, is controlled by or is under common control with Solar Capital Partners and is registered as an investment adviser under the Investment Advisers Act of 1940, as amended. The terms and conditions of the New Exemptive Order are otherwise substantially similar to the Exemptive Order. We believe that it will be advantageous for us to co-invest with funds managed by Solar Capital Partners where such investment is consistent with the investment objectives, investment positions, investment policies, investment strategy, investment restrictions, regulatory requirements and other pertinent factors applicable to us.

We have entered into a license agreement with Solar Capital Partners, pursuant to which Solar Capital Partners has agreed to grant us a non-exclusive, royalty-free license to use the name “Solar Senior Capital.” In addition, pursuant to the terms of the Administration Agreement, Solar Capital Management provides us with the office facilities and administrative services necessary to conduct our day-to-day operations.

Board Consideration of the Investment Advisory and Management Agreement

Our board of directors determined at a meeting held on November 2, 2017, to approve the Advisory Agreement between the Company and Solar Capital Partners. In its consideration of the approval of the Advisory Agreement, the board of directors focused on information it had received relating to, among other things:

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Based on the information reviewed and the discussions detailed above, the board of directors, including a majority of the directors who are not “interested persons” as defined in the 1940 Act, concluded that the fees payable to Solar Capital Partners pursuant to the Advisory Agreement were reasonable, and comparable to the fees paid by other management investment companies with similar investment objectives, in relation to the services to be provided. The board of directors did not assign relative weights to the above factors or the other factors considered by it. Individual members of the board of directors may have given different weights to different factors.

Director Independence

In accordance with rules of the NASDAQ Stock Market, our board of directors annually determines each director’s independence. We do not consider a director independent unless the board of directors has determined that he has no material relationship with us. We monitor the relationships of our directors and officers through a questionnaire each director completes no less frequently than annually and updates periodically as information provided in the most recent questionnaire changes.

Our governance guidelines require any director who has previously been determined to be independent to inform the Chairman of the board of directors, the Chairman of the Nominating and Corporate Governance Committee and our Corporate Secretary of any change in circumstance that may cause his status as an independent director to change. The board of directors limits membership on the Audit Committee, the Nominating and Corporate Governance Committee and the Compensation Committee to independent directors.

In order to evaluate the materiality of any such relationship, the board of directors uses the definition of director independence set forth in the rules promulgated by the NASDAQ Stock Market. Rule 5605(a)(2)

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provides that a director of a BDC, shall be considered to be independent if he or she is not an “interested person” of the Company, as defined in Section 2(a)(19) of the 1940 Act.

The board of directors has determined that each of the directors is independent and has no relationship with us, except as a director and stockholder, with the exception of Michael S. Gross, as a result of his positions as the Chief Executive Officer and President of the Company and a managing member of Solar Capital Partners, and Bruce Spohler, as a result of his position as Chief Operating Officer of the Company and a managing member of Solar Capital Partners.

Indemnification Agreements

We have entered into indemnification agreements with our directors. The indemnification agreements are intended to provide our directors the maximum indemnification permitted under Maryland law and the 1940 Act. Each indemnification agreement provides that Solar Senior Capital shall indemnify the director who is a party to the agreement (an “Indemnitee”), including the advancement of legal expenses, if, by reason of his or her corporate status, the Indemnitee is, or is threatened to be, made a party to or a witness in any threatened, pending, or completed proceeding, to the maximum extent permitted by Maryland law and the 1940 Act.

The Audit Committee and the independent directors of the board of directors have selected KPMG LLP to serve as the independent registered public accounting firm for the Company for the fiscal year ending December 31, 2018.

KPMG LLP has advised us that neither the firm nor any present member or associate of it has any material financial interest, direct or indirect, in the Company or its affiliates.

Table below in thousands

Audit Fees: Audit fees consist of fees billed for professional services rendered for the audit of our year-end financial statements and quarterly reviews and services that are normally provided by KPMG LLP in connection with statutory and regulatory filings.

Audit-Related Fees: Audit-related services consist of fees billed for assurance and related services that are reasonably related to the performance of the audit or review of our financial statements and are not reported under “Audit Fees.” These services include attest services that are not required by statute or regulation and consultations concerning financial accounting and reporting standards.

Tax Services Fees: Tax services fees consist of fees billed for professional tax services. These services also include assistance regarding federal, state, and local tax compliance.

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All Other Fees: Other fees would include fees for products and services other than the services reported above.

Pre-Approval Policy

The Audit Committee has established a pre-approval policy that describes the permitted audit, audit-related, tax and other services to be provided by KPMG LLP, the Company’s independent registered public accounting firm. The policy requires that the Audit Committee pre-approve the audit and non-audit services performed by the independent auditor in order to assure that the provision of such service does not impair the auditor’s independence.

Any requests for audit, audit-related, tax and other services that have not received general pre-approval must be submitted to the Audit Committee for specific pre-approval, irrespective of the amount, and cannot commence until such approval has been granted. Normally, pre-approval is provided at regularly scheduled meetings of the Audit Committee. However, the Audit Committee may delegate pre-approval authority to one or more of its members. The member or members to whom such authority is delegated shall report any pre-approval decisions to the Audit Committee at its next scheduled meeting. The Audit Committee does not delegate its responsibilities to pre-approve services performed by the independent registered public accounting firm to management. During the year ended December 31, 2017, the Audit Committee pre-approved 100% of services described in this policy.

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PART IV

a. Documents Incorporated by Reference as Part of this Report

Consolidated financial statements. The financial statements of the Company are set forth in the Original Filing.

Financial Statement Schedule. All financial statement schedules are omitted because of the absence of conditions under which they are required or because the required information is given in the Original Filing.

b. Exhibits

The following exhibits are filed as part of this report or hereby incorporated by reference to exhibits previously filed with the SEC:

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c. Consolidated Financial Statement Schedules

All financial statement schedules are omitted because of the absence of conditions under which they are required or because the required information is given in the Original Filing.

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SIGNATURES

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

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 capacity and on the dates indicated.

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