---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-274195"
form_type: "8-K"
ticker: "BLLN"
cik: "0002070849"
company_name: "BillionToOne, Inc."
filed_at: "2025-11-10T23:59:59+00:00"
generated_at: "2026-05-16T22:43:03.856243+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# BillionToOne closes IPO of 5.23M shares at $60; gross proceeds ~$314M

## Summary
- Closed IPO on Nov 7, 2025, selling 5,233,765 shares (including full underwriter option) at $60.00 per share.
- Gross proceeds of approximately $314.0 million before underwriting discounts and offering expenses.
- Filed amended and restated certificate of incorporation and bylaws effective upon IPO closing.

## SEC filing metadata
- accession: 0001193125-25-274195
- form_type: 8-K
- ticker: BLLN
- cik: 0002070849
- company_name: BillionToOne, Inc.
- filed_at: 2025-11-10T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2070849/000119312525274195/0001193125-25-274195-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2070849/000119312525274195/d59194d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-274195
- JSON: https://secwatch.observer/filing/0001193125-25-274195.json
- Plain text: https://secwatch.observer/filing/0001193125-25-274195.txt

## Key facts
- Governance Changes
  BillionToOne, Inc.: Amended and restated bylaws became effective upon IPO closing (effective 2025-11-07).
  - Change: bylaw amendment
  - Effective: 2025-11-07
  source text: and its amended and restated bylaws (the “Bylaws”) became effective, in connection with the closing of the initial public offering
  evidence_url: https://www.sec.gov/Archives/edgar/data/2070849/000119312525274195/0001193125-25-274195-index.htm
- Governance Changes
  BillionToOne, Inc.: Amended and restated certificate of incorporation became effective upon IPO closing (effective 2025-11-07).
  - Change: charter amendment
  - Effective: 2025-11-07
  source text: On November 7, 2025, BillionToOne, Inc. (the “Company”) filed its amended and restated certificate of incorporation (the “Certificate of Incorporation”) with the Secretary of State of the State of Delaware
  evidence_url: https://www.sec.gov/Archives/edgar/data/2070849/000119312525274195/0001193125-25-274195-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.