UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2026

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 814-01758

West Bay BDC LLC

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s Telephone Number, Including Area Code: (312) 655-4419

Not Applicable

Former Name, Former Address and Former Fiscal Year, If Changed Since Last Report.

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

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 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.

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 ☒

As of May 12, 2026, there were 14,487,726 of the limited liability company's common units outstanding.

West Bay BDC LLC

QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2026

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This report contains forward-looking statements that involve substantial risks and uncertainties. You can identify these statements by the use of forward-looking terminology such as “may,” “will,” “should,” “expect,” “anticipate,” “project,” “target,” “estimate,” “intend,” “continue” or “believe” or the negatives of, or other variations on, these terms or comparable terminology. You should read statements that contain these words carefully because they discuss our plans, strategies, prospects and expectations concerning our business, operating results, financial condition and other similar matters. We believe that it is important to communicate our future expectations to our investors. Our forward-looking statements include information in this report regarding general domestic and global economic conditions, our future financing plans, our ability to operate as a business development company (“BDC”) and the expected performance of, and the yield on, our portfolio companies. There may be events in the future, however, that we are not able to predict accurately or control. The factors listed under “Risk Factors” in our annual report on Form 10-K for the year ended December 31, 2025, as well as any cautionary language in this report, provide examples of risks, uncertainties and events that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. The occurrence of the events described in these risk factors and elsewhere in this report could have a material adverse effect on our business, results of operations and financial position. Any forward-looking statement made by us in this report speaks only as of the date of this report. Factors or events that could cause our actual results to differ from our forward-looking statements may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. You are advised to consult any additional disclosures that we may make directly to you or through reports that we have filed or in the future may file with the U.S. Securities and Exchange Commission (the “SEC”), including annual reports on Form 10-K, registration statements on Form N-2, quarterly reports on Form 10-Q and current reports on Form 8-K. The safe harbor provisions of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), which preclude civil liability for certain forward-looking statements, do not apply to the forward-looking statements in this quarterly report because we are an investment company. The following factors are among those that may cause actual results to differ materially from our forward-looking statements:

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

West Bay BDC LLC

Statements of Financial Condition

(in thousands, except unit and per unit amounts)

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

West Bay BDC LLC

Statements of Operations

(in thousands, except unit and per unit amounts)

(Unaudited)

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

West Bay BDC LLC

Statements of Changes in Members' Capital

(in thousands, except per unit amounts)

(Unaudited)

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

West Bay BDC LLC

Statements of Cash Flows

(in thousands, except unit and per unit amounts)

(Unaudited)