Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 98

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 98
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     | developments or disputes concerning our or third-party intellectual property or proprietary rights; |

| • |     | announced or completed acquisitions of businesses or technologies, or other strategic transactions by us or our 
 competitors;                                                                                                    |

| • |     | actual or perceived breaches of, or failures relating to, privacy, data protection or data security; |

| • |     | new laws or regulations or new interpretations of existing laws or regulations applicable to our business; |

| • |     | actual or anticipated changes in our senior management or key personnel; |

| • |     | expiration of contractual lock-up agreements and market stand-off agreements with our executive officers, directors, employees and stockholders; |

| • |     | changes in the size or growth of our target markets; |

| • |     | economic and market conditions in general, including those resulting from geopolitical tensions, tariffs and other trade 
 actions, war, pandemics, terrorism or responses to these events; and                                                     |

| • |     | the realization of any risks described under this “Risk factors” section, or other risks that may materialize in 
 the future.                                                                                                      |

Furthermore, the stock market has experienced extreme volatility that in some cases has been unrelated or disproportionate to the operating performance of particular companies. These and other factors may cause the market price and demand for our Class A common stock to fluctuate substantially, which may limit or prevent investors from readily selling their shares of Class A common stock and may otherwise negatively affect the liquidity of our Class A common stock. Our dual-class capital structure will have the effect of concentrating voting power with holders of our Class B common stock, who will have significant influence over us and, if acting together, will be able to control matters requiring stockholder approval. Our Class A common stock, which is the stock we are offering by means of this prospectus, will have one vote per share and our Class B common stock will have 10 votes per share. After the completion of this offering, the 67

holders of our outstanding Class B common stock, Drs. Atay and Tsao, will together hold % of the voting power of our outstanding capital stock (or %
if the underwriters exercise their option to purchase additional shares of our Class A common stock in full). See the section titled “Principal stockholders.” As a result, Drs. Atay and Tsao will be able to exert significant influence
over us and, if acting together, will be able to control matters requiring stockholder approval, including the election