Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 403

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 403
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 Exhibit 1.1 to this registration statement, indemnifying our directors and officers against limited liabilities. In addition, Section 2.8 of our IRA contained in Exhibit 4.1 to this registration statement provides for indemnification of certain of our stockholders against liabilities described therein. We currently carry and intend to continue to carry liability insurance for our directors and officers. Item 15. Recent sales of unregistered securities The following list sets forth information regarding all unregistered securities issued by us since January 1, 2022: Convertible promissory notes

| • |     | In September 2022, we issued convertible promissory notes with an approximate principal value of $30.0 million to                                                                                                                                                                                                                                        
 seventeen accredited investors (the Convertible Promissory Notes). Each Convertible Promissory Note had an interest rate of 8% per annum. In May 2024, such Convertible Promissory Notes converted into an aggregate of 1,726,823 shares of Series C-1 redeemable convertible preferred stock at a conversion price of approximately $19.6143 per share. |

Note Purchase Agreement We entered into a debt facility with availability of up to $140.0 million, issuable in four separate tranches, pursuant a Note Purchase Agreement, dated as of August 2, 2024, by and among us, the purchasers party thereto, and BWCB SA LLC (an entity affiliated with Oberland Capital), as purchaser’s agent (the Note Purchase Agreement). As of June 30, 2025, we have drawn $50 million under the debt facility. The advanced principal accrues interest at a rate of 8.0% per annum. Under the Note Purchase Agreement, subject to the terms and conditions set forth in such Agreement, we have the option, but not the obligation, to issue and sell an additional two separate tranches of notes in the amounts of $35.0 million and $25.0 million, and an obligation to sell a tranche of notes in the amount of $30.0 million prior to March 31, 2026 as we have crossed the thresholds triggering this obligation. The thresholds are trailing six-month revenue of at least $112.5 million and a trailing six-month gross margin (as defined in the Note Purchase Agreement) of at least 45%. II-2

Redeemable convertible preferred stock

| • |     | Between March 2022 and September 2022, we issued an aggregate of 5