BillionToOne, Inc. (BLLN) Stock

HealthcareDiagnostics & Research Website

5 of the hedge funds AlphaScala tracks reported BLLN in 13F filings for the quarter ended Jun 30, 2026; the largest reported position is Millennium Management's at $51.00M. Company insiders reported 0 open-market buys and 91 sales on SEC Form 4 in the 90 days to Oct 21, 2026.

Which hedge funds own BLLN?

From 13F filings
FundShares HeldPosition ValueChange vs prior Q
Millennium Management
Israel Englander
425K$51.00MNEW
Renaissance Technologies
Jim Simons (founder)
97K$11.59M+88%
Marshall Wace45K$5.36MNEW
D.E. Shaw
David Shaw
26K$3.12M+573%
Citadel
Ken Griffin
15K$1.82MNEW

13F holdings as of Jun 30, 2026

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Are BillionToOne, Inc. insiders buying or selling?

SEC Form 4 filings
90 days to Oct 21, 2026
Buys
0
Sells
91
Net $
-$29.7M
Unique insiders
5
DateInsiderRoleTypeSharesValue
Oct 15, 26Atay OguzhanChairman and CEOSELL900$89K
Oct 15, 26Atay OguzhanChairman and CEOSELL1.9K$186K
Oct 15, 26Atay OguzhanChairman and CEOSELL1.3K$128K
Oct 15, 26Atay OguzhanChairman and CEOSELL980$100K
Oct 15, 26Atay OguzhanChairman and CEOSELL133$14K
Oct 14, 26Atay OguzhanChairman and CEOSELL3.1K$303K
Oct 14, 26Atay OguzhanChairman and CEOSELL100$10K
Oct 14, 26Atay OguzhanChairman and CEOSELL2.7K$261K
Oct 12, 26Atay OguzhanChairman and CEOSELL2.0K$180K
Oct 12, 26Atay OguzhanChairman and CEOSELL2.6K$238K

SEC Form 4 filings as of Oct 21, 2026

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What does BillionToOne, Inc. do?

BillionToOne, Inc. is a precision diagnostics company specializing in the development of advanced molecular diagnostic tests for healthcare applications. The company’s core innovation is its proprietary single-molecule next-generation sequencing (smNGS) platform, which enables highly sensitive and accurate detection and quantification of DNA molecules at the single-molecule level. This technological breakthrough underpins BillionToOne’s flagship product lines, including UNITY Complete, a non-invasive prenatal screening test that assesses fetal risk for chromosomal aneuploidies, recessive conditions such as sickle cell disease and cystic fibrosis, and fetal antigens, all from a single maternal blood draw. Additionally, the company’s Northstar Select and Northstar Response tests are designed for oncology, offering sensitive liquid biopsy solutions that guide therapy selection and provide longitudinal monitoring of cancer burden. BillionToOne’s molecular counting technologies are intended to address significant unmet needs in both the prenatal and oncology sectors, enabling earlier, safer, and more comprehensive disease detection. With a mission to improve healthcare accessibility and patient outcomes, BillionToOne plays a transformative role in the diagnostics and research segment of the healthcare market, supporting the shift toward personalized and non-invasive medicine.

CEO
Dr. Oguzhan Atay Ph.D.
Employees
713
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