Company: BLLN
Filing Date: 2025-09-17
Form Type: DRS/A
Source: 0001193125-25-206347
Chunk: 134

Company: BillionToOne, Inc.
Filing Date: 2025-09-17
Form: DRS/A
Chunk 134
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us, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. The following table summarizes, as of June 30, 2025, on the pro forma as adjusted basis described above, the number of shares of our Class A common stock, the total consideration and the average price per share (i) paid to us by our existing stockholders and (ii) to be paid by investors purchasing shares of our Class A common stock in this offering at an assumed initial public offering price of $ per share, the midpoint of the estimated offering price range set forth on the cover page of this prospectus, before deducting underwriting discounts and commissions and estimated offering expenses payable by us.

| (in thousands, except share and per share data and 
 percentages)                                       |     | Shares purchased 
 Number           |     | Percent |      |     | Total consideration 
 Amount              |     | Percent |      |     | Weighted- 
 average   
 price per 
 share     |
|:---------------------------------------------------|:----|:-----------------|:----|:--------|:-----|:----|:--------------------|:----|:--------|:-----|:----|:----------|
| Existing stockholders                              |     |                  |     |         | %    |     | $                   |     |         | %    |     | $         |
| New investors                                      |     |                  |     |         |      |     |                     |     |         |      |     | $         |
| Total                                              |     |                  |     |         | 100% |     | $                   |     |         | 100% |     |           |

The presentation in this table regarding ownership by existing stockholders does not give effect to any purchases that existing stockholders may make through our directed share program or otherwise purchase in this offering. If the underwriters exercise their option to purchase additional shares of Class A common stock in full, the number of shares held by the existing stockholders after this offering would be reduced to shares, or % of the total number of shares of our Class A common stock outstanding after this offering, and the number of shares held by new investors would increase to shares, or % of the total number of shares of our Class A common stock outstanding after this offering. 85

The foregoing discussion and calculations above (other than the historical net tangible book value calculations) are based on shares of our Class A common stock and shares of our Class B common stock outstanding as of June 30,