EX-3.3

Exhibit 3.3

SLR SECURED SPECIALTY LENDING FUND

BYLAWS

Dated as of [•], 2026

These Bylaws are made and adopted pursuant to the Amended and Restated Declaration of Trust governing SLR Secured Specialty Lending Fund (the “Trust”) dated as of [•], 2026, as from time to time amended (hereinafter called the “Declaration”). All words and terms capitalized in these Bylaws shall have the meaning or meanings set forth for such words or terms in the Declaration.

ARTICLE I

Offices

1.1 Principal Office. The principal office of the Trust in the State of Delaware shall be located at such place as the Board of Trustees of the Trust (the “Trustees” or the “Board”) may designate from time to time.

1.2 Additional Offices. The principal executive office of the Trust is at 500 Park Avenue, 3rd Floor New York, NY 10022. The Trust may have additional offices at such places as the Board may from time to time determine or the business of the Trust may require.

ARTICLE II

Shareholder Meetings

2.1 Place. All meetings of Shareholders shall be held at the principal executive office of the Trust or at such other place as shall be set by the Board and stated in the notice of the meeting.

2.2 Chairman. The Chairman, if any, shall act as chairperson at all meetings of the Shareholders; in the Chairman’s absence, the Trustee or Trustees present at each meeting may elect a temporary chairperson for the meeting, who may be one of themselves.

2.3 Inspectors of Election. In advance of any meeting of Shareholders, the Trustees may appoint Inspectors of Election to act at the meeting or any adjournment thereof. If Inspectors of Election are not so appointed, the Chairman, if any, of any meeting of Shareholders may, and on the request of any Shareholder or Shareholder proxy shall, appoint Inspectors of Election of the meeting. The number of Inspectors of Election shall be either one or three. If appointed at the meeting on the request of one or more Shareholders or proxies, a majority of Shares present shall determine whether one or three Inspectors of Election are to be appointed, but failure to allow such determination by the Shareholders shall not affect the validity of the appointment of Inspectors of Election. In case any person appointed as Inspector of Election fails to appear or fails or refuses to act, the vacancy may be filled by appointment made by the Trustees in advance of the convening of the meeting or at the meeting by the person acting as Chairman. The Inspectors of Election shall determine the number of Shares outstanding, the Shares represented at the meeting, the existence of a quorum, the authenticity, validity and effect of proxies, shall

receive votes, ballots or consents, shall hear and determine all challenges and questions in any way arising in connection with the right to vote, shall count and tabulate all votes or consents, determine the results, and do such other acts as may be proper to conduct the election or vote with fairness to all Shareholders. If there are three Inspectors of Election, the decision, act or certificate of a majority is effective in all respects as the decision, act or certificate of all. On request of the Chairman, if any, of the meeting, or of any Shareholder or Shareholder proxy, the Inspectors of Election shall make a report in writing of any challenge or question or matter determined by them and shall execute a certificate of any facts found by them.

2.4 Records at Shareholder Meetings. At each meeting of the Shareholders, there shall be made available for inspection at a convenient time and place during normal business hours, if requested by Shareholders, a list of the Shareholders of the Trust, as of the record date of the meeting or the date of closing of transfer books, as the case may be. Such list of Shareholders shall contain the name and the address of each Shareholder in alphabetical order and the number of Shares owned by such Shareholder. Shareholders shall have such other rights and procedures of inspection of the books and records of the Trust as are granted to shareholders of a Delaware business corporation.

ARTICLE III

Officers

3.1 General Provisions. The officers of the Trust may include a president, a secretary and a treasurer and may also include a chief executive officer, one or more vice presidents, a chief operating officer, a chief financial officer, one or more assistant. secretaries and one or more assistant treasurers. In addition, the Board may from time to time elect such other officers with such powers and duties as it shall deem necessary or desirable. The Board may designate a Chairman of the Board and a Vice Chairman of the Board of the Trustees, who shall not be officers of the Trust but shall have such powers and duties as determined by the Board from time to time. The officers of the Trust shall be elected annually by the Board, except that the chief executive officer or president may from time to time appoint one or more vice presidents, assistant secretaries, assistant treasurers or other officers. Each officer shall hold office until his or her successor is elected and qualifies or until death, resignation or removal in the manner hereinafter provided. Any two or more offices except president and vice president may be held by the same person. Election of an officer or agent shall not of itself create contract rights between the Trust and such officer or agent.

3.2 Removal and Resignation. Any officer or agent of the Trust may be removed, with or without cause, by the Board if in its judgment the best interests of the Trust would be served thereby, but such removal shall be without prejudice to the contract rights, if any, of the person so removed. Any officer of the Trust may resign at any time by giving written notice of his or her resignation to the Board, the chairman of the board, the president or the secretary. Any resignation shall take effect immediately upon its receipt or at such later time specified in the notice of resignation. The acceptance of a resignation shall not be necessary to make it effective unless otherwise stated in the resignation. Such resignation shall be without prejudice to the contract rights, if any, of the Trust.

3.3 Vacancies. A vacancy in any office may be filled by the Board for the balance of the term.

3.4 Chief Executive Officer. The Board may designate a chief executive officer. In the absence of such designation, the president shall be the chief executive officer of the Trust. The chief executive officer shall have general responsibility for implementation of the policies of the Trust, as determined by the Board, and for the management of the business and affairs of the Trust. He or she may execute any deed, mortgage, bond, contract or other instrument, except in cases where the execution thereof shall be expressly delegated by the Board or by these Bylaws to some other officer or agent of the Trust or shall be required by law to be otherwise executed; and in general shall perform all duties incident to the office of chief executive officer and such other duties as may be prescribed by the Board from time to time.

3.5 Chief Operating Officer. The Board may designate a chief operating officer. The chief operating officer shall have the responsibilities and duties as set forth by the Board or the chief executive officer.

3.6 Chief Financial Officer. The Board may designate a chief financial officer. The chief financial officer shall have the responsibilities and duties as set forth by the Board or the chief executive officer.

3.7 President. In the absence of a designation of a chief executive officer by the Board, the president shall be the chief executive officer. He or she may execute any deed, mortgage, bond, contract or other instrument, except in cases where the execution thereof shall be expressly delegated by the Board or by these Bylaws to some other officer or agent of the Trust or shall be required by law to be otherwise executed; and in general shall perform all duties incident to the office of president and such other duties as may be prescribed by the Board from time to time.

3.8 Vice Presidents. In the absence of the president or in the event of a vacancy in such office, the vice president (or in the event there be more than one vice president, the vice presidents in the order designated at the time of their election or, in the absence of any designation, then in the order of their election) shall perform the duties of the president and when so acting shall have all the powers of and be subject to all the restrictions upon the president; and shall perform such other duties as from time to time may be assigned to such vice president by the president or by the Board. The Board may designate one or more vice presidents as executive vice president or as vice president for particular areas of responsibility.

3.9 Secretary The secretary shall (a) keep the minutes of the proceedings of the stockholders, the Board and committees of the Board in one or more books provided for that purpose; (b) see that all notices are duly given in accordance with the provisions of these Bylaws or as required by law; (c) be custodian of the corporate records and of the seal of the Trust; (d) keep a register of the post office address of each stockholder which shall be furnished to the secretary by such stockholder; (e) have general charge of the stock transfer books of the Trust; and (f) in general perform such other duties as from time to time may be assigned to him by the chief executive officer, the president or by the Board.

3.10 Treasurer The treasurer shall keep full and accurate accounts of receipts and disbursements in books belonging to the Trust and shall deposit all moneys and other valuable effects in the name and to the credit of the Trust in such depositories as may be designated by the Board. In the absence of a designation of a chief financial officer by the Board, the treasurer shall be the chief financial officer of the Trust.

The treasurer shall disburse the funds of the Trust as may be ordered by the Board, taking proper vouchers for such disbursements, and shall render to the president and Board, at the regular meetings of the Board or whenever it may so require, an account of all his or her transactions as treasurer and of the financial condition of the Trust.

If required by the Board, the treasurer shall give the Trust a bond in such sum and with such surety or sureties as shall be satisfactory to the Board for the faithful performance of the duties of his or her office and for the restoration to the Trust, in case of his or her death, resignation, retirement or removal from office, of all books, papers, vouchers, moneys and other property of whatever kind in his or her possession or under his or her control belonging to the Trust.

3.11 Assistant Secretaries and Assistant Treasurers. The assistant secretaries and assistant treasurers, in general, shall perform such duties as shall be assigned to them by the secretary or treasurer, respectively, or by the president or the Board. The assistant treasurers shall, if required by the Board, give bonds for the faithful performance of their duties in such sums and with such surety or sureties as shall be satisfactory to the Board.

ARTICLE IV

Committees

4.1 Appointment. The Board may appoint from its members an Audit Committee, a Nominating and Corporate Governance Committee, a Compensation Committee and other committees, composed of one or more trustees, to serve at the pleasure of the Board.

4.2 Powers. The Board may delegate to committees appointed under Section 4.1 any of the powers of the Board, except as prohibited by law.

ARTICLE V

Miscellaneous

5.1 Depositories. The funds of the Trust shall be deposited in such custodians as the Trustees shall designate and shall be drawn out on checks, drafts or other orders signed by such officer, officers, agent or agents (including the adviser, administrator or manager), as the Trustees may from time to time authorize.

5.2 Contracts. The Board may authorize any officer or agent to enter into any contract or to execute and deliver any instrument in the name of and on behalf of the Trust and such authority may be general or confined to specific instances. Any agreement, deed, mortgage, lease or other document shall be valid and binding upon the Trust when authorized or ratified by action of the Board and executed by an authorized person.

5.3 Signatures. All contracts and other instruments shall be executed on behalf of the Trust by its authorized officers, agent or agents, as provided in the Declaration or Bylaws or as the Trustees may from time to time by resolution provide.

5.4 Seal. The Trust is not required to have any seal, and the adoption or use of a seal shall be purely ornamental and be of no legal effect. The seal, if any, of the Trust may be affixed to any instrument, and the seal and its attestation may be lithographed, engraved or otherwise printed on any document with the same force and effect as if it had been imprinted and affixed manually in the same manner and with the same force and effect as if done by a Delaware business corporation. The presence or absence of a seal shall have no effect on the validity, enforceability or binding nature of any document or instrument that is otherwise duly authorized, executed and delivered.

ARTICLE VI

Share Transfers

6.1 Transfer Agents, Registrars and the Like. As provided in Section 6.7 of the Declaration, the Trustees shall have authority to employ and compensate such transfer agents and registrars with respect to the Shares of the Trust as the Trustees shall deem necessary or desirable. In addition, the Trustees shall have power to employ and compensate such dividend disbursing agents, warrant agents and agents for the reinvestment of dividends as they shall deem necessary or desirable. Any of such agents shall have such power and authority as is delegated to any of them by the Trustees.

6.2 Transfer of Shares. The Shares of the Trust shall not be transferrable except as permitted in the Declaration. The Trust, or its transfer agents, shall be authorized to refuse any transfer unless and until presentation of such evidence as may be reasonably required to show that the requested transfer is proper and being made in accordance with the Trust’s offering documents (as may be amended from time to time).

6.3 Registered Shareholders. The Trust may deem and treat the holder of record of any Shares as the absolute owner thereof for all purposes and shall not be required to take any notice of any right or claim of right of any other person.

ARTICLE VII

Fiscal Year

7.1 Fiscal Year. The fiscal year of the Trust shall end on December 31 of each fiscal year, and may thereafter be changed by duly adopted resolution of the Board from time to time.

ARTICLE VIII

Investment Company Act

7.1 Investment Company Act. If and to the extent that any provision of the Statutory Trust Act, or any provision of the Declaration or these Bylaws conflicts with any provision of the 1940 Act, then the applicable provision of the 1940 Act shall control; provided, however, that such conflict shall not affect any of the remaining provisions of these Bylaws or the Declaration or render invalid or improper any action take or omitted prior to such determination.

ARTICLE IX

Amendment of Bylaws

8.1 Amendment and Repeal of Bylaws. In accordance with Section 3.7 of the Declaration, the Trustees shall have the exclusive power to amend or repeal the Bylaws or adopt new Bylaws at any time. Action by the Trustees with respect to the Bylaws shall be taken by an affirmative vote of a majority of the Trustees. The Trustees shall in no event adopt Bylaws which are in conflict with the Declaration, and any apparent inconsistency shall be construed in favor of the related provisions in the Declaration.