Hummingbird Ventures Management NV discloses 18.6% stake in BillionToOne
BillionToOne
- 18.6%[1]
Hummingbird Ventures Management NV reported a 18.6% stake in BillionToOne (BLLN) in a Schedule 13D filed with the SEC on Nov 9, 2026. The filing covers 8,034,797 shares.[1]
| Reporting person | Security | Shares | Ownership | Filed |
|---|---|---|---|---|
| Hummingbird Ventures Management NV | BillionToOne, Inc | 8,034,797 | 18.6% | 2026-11-09 |
What is a Schedule 13D?
A Schedule 13D can signal intent to influence a company. Holders above five percent of a class must file one. It reports ownership, not a trade price.[1]
What does this filing not show?
The form shows ownership on its cover page. It does not show what the holder paid or what it plans to do next.[1]
BLLN insider trading activity
In open-market trades dated in the last 90 days, no insider bought and 3 insiders sold $20.9M, all of it under preset trading plans, per Form 4 filings.
- Oguzhan Atay (Chairman and CEO) sold 112,999 shares for $11.9M under a preset plan, last filed Nov 5.
- David Tsao (Chief Technology Officer) sold 73,333 shares for $7.7M under a preset plan, last filed Nov 5.
- Bosch John Roderick Ten (SVP of Laboratory Operations) sold 11,333 shares for $1.2M under a preset plan, last filed Nov 5.
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BLLN 13F fund activity
In 13F filings for the quarter ended Jun 30, 2026, 2 funds we track made a large change in BLLN: 2 opened a position or grew one by half or more, and none cut one by half or more.
- Millennium Management LLC added 425,032 shares.
- Oberweis Asset Management Inc/ added 299,030 shares.
