Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 274

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 274
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 the holders of shares of any series of
our preferred stock that we may designate in the future.

Preferred stock

As of , there were shares of our redeemable convertible preferred stock outstanding. Immediately prior to the
completion of this offering, each outstanding share of redeemable convertible preferred stock will convert into one share of our common stock pursuant to the Preferred Stock Conversion.

Upon the filing and effectiveness of our Post-IPO Certificate of Incorporation, our Board of Directors may, without further
action by our stockholders, fix the rights, preferences, privileges, and restrictions of up to an aggregate of shares of preferred stock in one or more series and authorize their issuance. These rights, preferences, and
privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms, and the number of shares constituting any series or the designation of such series, any or all of which may
be greater than the rights of our common stock. The issuance of our preferred stock could adversely affect the voting power of holders of our common stock, and the likelihood that such holders will receive dividend payments and payments upon
liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring, or preventing a change of control or other corporate action. Upon the completion of this offering, no shares of preferred stock will be
outstanding, and we have no present plan to issue any shares of preferred stock.

Stock options

As of June 30, 2025, options to purchase an aggregate of shares of common stock were outstanding at a weighted-average exercise price of
approximately $ per share. For additional information regarding the terms of our stock options outstanding under our 2018 Plan, see the section titled “Executive compensation—Equity plans.”

Warrants

As of December 31, 2024, we had outstanding warrants to
purchase (i) an aggregate of up to 80,357 shares of our common stock with an exercise price of $2.80 per share (the 2021 Common Warrant), (ii) an aggregate of up to 41,209 shares of our common stock with an exercise price of $10.92 per share
(the 2022 Common Warrant and together with the 2021 Common Warrant, the Common Warrants) and (iii) an aggregate of up to 9,660 shares of our Series A-6 redeemable convertible preferred stock with an
exercise price of $2.5879 per share (the