Regulation FD Disclosure (Form 8-K)

Item 7.01 - Regulation FD Disclosure.

Phillip Street Middle Market Lending Fund LLC (the "Company") is furnishing the following additional information regarding its investment portfolio:

Loans underwritten by the Company based on the portfolio company's annualized recurring revenue rather than its EBITDA represented 1.9% of the Company's total portfolio at fair value as of December 31, 2025. Additionally, the Company's portfolio contains investments with payment-in-kind("PIK") terms, where borrowers pay accrued interest not with cash, but by adding the accrued interest to the principal balance of the loan. Investments with PIK may be a proactive financing strategy structured into the loan agreement from the outset or it may be introduced as a loan modification or amendment after the initial agreement. During the fourth quarter of 2025, 2.3% of the Company's total investment income was derived from investments with PIK terms, of which 0.3% of the Company's total investment income was from PIK that was introduced as a loan modification or amendment after the initial agreement.

The information disclosed under this Item 7.01 is being "furnished" and shall not be deemed "filed" by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.