Subsequent Events	12 Months Ended
Dec. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	12. SUBSEQUENT EVENTS Subsequent events after the date of the Statements of Financial Condition have been evaluated through the date the audited financial statements were issued. Other than the items discussed below, the Company has concluded that there is no impact requiring adjustment or disclosure in the financial statements. Amendment to SCB Revolving Credit Facility On January 30, 2026, the Company entered into a first amendment to the SCB Revolving Credit Facility, by and among the Company, as borrower, and Standard Chartered Bank Ltd., as administrative agent, lead arranger, sole bookrunner, letter of credit issuer and lender (the “Amendment”). The Amendment, among other things, (i) increases the Maximum Commitment amount to $400,000, (ii) extends the Stated Maturity Date from September 25, 2026 to September 24, 2027 and (iii) decreases the Applicable Margin (a) with respect to Term SOFR Loans, Alternative Currency Term Rate Loans, Daily CORRA Loans, Daily SONIA Loans and Letters of Credit, to 1.85% per annum, and (b) with respect to Base Rate Loans, to 0.85% per annum. Capitalized terms used but not otherwise defined have the meanings ascribed to them in the SCB Revolving Credit Facility. Distributions The Company will pay a distribution equal to an amount up to the Company’s taxable earnings per Unit, including net investment income (if positive) for the period beginning January 1, 2026 through March 31, 2026, which will be payable on or about April 29, 2026 to Unitholders of record as of April 2, 2026. Capital Call On February 23, 2026, the Company delivered a capital drawdown notice to its investors relating to the issuance and sale of approximately 2.7 million common units for an aggregate offering price of approximately $46,351. The units will be issued on or about March 9, 2026. West Bay BDC LLC—Tax Information (unaudited) During the year ended December 31, 2025, the Company designated 98.68% of its distributions from net investment income as interest-related dividends pursuant to Section 871(k) of the Internal Revenue Code. For the year ended December 31, 2025, the Company designated 95.74% of the dividends paid from net investment company taxable income as Section 163(j) Interest Dividends.

Subsequent Events

12 Months Ended

Dec. 31, 2025

12. SUBSEQUENT EVENTS

Subsequent events after the date of the Statements of Financial Condition have been evaluated through the date the audited financial statements were issued. Other than the items discussed below, the Company has concluded that there is no impact requiring adjustment or disclosure in the financial statements.

Amendment to SCB Revolving Credit Facility

On January 30, 2026, the Company entered into a first amendment to the SCB Revolving Credit Facility, by and among the Company, as borrower, and Standard Chartered Bank Ltd., as administrative agent, lead arranger, sole bookrunner, letter of credit issuer and lender (the “Amendment”). The Amendment, among other things, (i) increases the Maximum Commitment amount to $400,000, (ii) extends the Stated Maturity Date from September 25, 2026 to September 24, 2027 and (iii) decreases the Applicable Margin (a) with respect to Term SOFR Loans, Alternative Currency Term Rate Loans, Daily CORRA Loans, Daily SONIA Loans and Letters of Credit, to 1.85% per annum, and (b) with respect to Base Rate Loans, to 0.85% per annum. Capitalized terms used but not otherwise defined have the meanings ascribed to them in the SCB Revolving Credit Facility.

Distributions

The Company will pay a distribution equal to an amount up to the Company’s taxable earnings per Unit, including net investment income (if positive) for the period beginning January 1, 2026 through March 31, 2026, which will be payable on or about April 29, 2026 to Unitholders of record as of April 2, 2026.

Capital Call

On February 23, 2026, the Company delivered a capital drawdown notice to its investors relating to the issuance and sale of approximately 2.7 million common units for an aggregate offering price of approximately $46,351. The units will be issued on or about March 9, 2026.

West Bay BDC LLC—Tax Information (unaudited)

During the year ended December 31, 2025, the Company designated 98.68% of its distributions from net investment income as interest-related dividends pursuant to Section 871(k) of the Internal Revenue Code.

For the year ended December 31, 2025, the Company designated 95.74% of the dividends paid from net investment company taxable income as Section 163(j) Interest Dividends.