Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 289

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 289
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 rules of the Foreign Investment in Real Property Tax Act (FIRPTA), treat the gain as effectively connected with a U.S. 
 trade or business.                                                                                                         |

The FIRPTA rules may apply to a sale, exchange or other disposition of our Class A common stock if we are, or were within the shorter of the five-year period preceding the disposition and the non-U.S.holder’s holding period, a U.S. real property holding corporation, or USRPHC. In general, we would be a USRPHC if interests in U.S. real property comprised at least half of the value of our worldwide real property and our other assets held for use in a trade or business. Although there can be no assurances, we believe that we are not currently and will not become a USRPHC for U.S. federal income tax purposes, and the remainder of this discussion so assumes. However, because the determination of whether we are a USRPHC depends on the fair market value of our U.S. real property interests relative to the fair market value of our U.S. and worldwide real property interests plus our other assets used or held for use in a trade or business, there can be no assurance that we will not become a USRPHC in the future. Even if we are or were to become a USRPHC gain arising from the sale or other taxable disposition by a non-U.S.holder will not be subject to U.S. federal income tax if our Class A common stock is “regularly traded,” as defined by applicable Treasury Regulations, on an established securities market, and such non-U.S.holder owned, actually and constructively, 5% or less of our Class A common stock throughout the shorter of the five-year period ending on the date of the sale or other taxable disposition or the non-U.S.holder’s holding period. If the foregoing exception does not apply, and we are a USRPHC, a Non-U.S.Holder’s proceeds received on the disposition of our Class A common stock will generally be subject to withholding at a rate of 15%. No assurances can be provided that our Class A common stock will be regularly traded on an established securities market for the purposes of the rule described above. 223

If any gain from the sale, exchange or other disposition of our Class A common stock, (1) is effectively
connected with a U.S. trade or business conducted by a non-U.S. holder and (2) if required by an applicable