156 institutional investment managers reported BLLN positions in their Form 13F filings for Q2 2026, holding 15,278,720 shares worth $1.8B in total. Adams Street Partners LLC reported the largest position.

Are funds buying or selling BLLN?

In Q2 2026, 76 managers opened new BLLN positions, 49 added, 13 trimmed and 11 sold out. Managers that filed in both quarters added a net 3,928,196 shares.

How current is this BLLN institutional ownership data?

It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Funds · BLLN

Who owns BLLN?

Institutional ownership of BillionToOne Inc. from Form 13F, Q2 2026

156 institutional managers reported holding BillionToOne Inc. (BLLN) in Form 13F filings for Q2 2026, with 15,278,720 shares worth $1.8B. The largest reported holder was Adams Street Partners LLC. Managers that filed both quarters added a net 3,928,196 shares (+34.6%). 76 opened new positions and 11 sold out.

Funds holding: 156
Value held: $1.8B
New / sold out: 76 / 11
Net shares, same filers: +34.6%

Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Largest holders of BLLN

Fund	Value	Share of 13F holdings	Shares	Move
Adams Street Partners LLC	$205M	11.2%	1,711,430	Unchanged
Price T Rowe Associates Inc	$121M	6.6%	1,010,322	Added
Baillie Gifford & Co	$108M	5.9%	901,420	Trimmed
Vanguard Portfolio Management LLC	$101M	5.5%	840,970	Added
Invesco Ltd.	$100M	5.5%	835,614	Added
Vanguard Capital Management LLC	$95.9M	5.2%	799,468	Added
Neuberger Berman Group LLC	$91.7M	5.0%	764,215	Added
Bamco Inc	$89.0M	4.9%	742,093	Unchanged
Wasatch Advisors LP	$62.2M	3.4%	518,084	Added
Millennium Management LLC	$51.0M	2.8%	425,032	New
Fuller & Thaler Asset Management, Inc.	$50.2M	2.7%	418,565	New
Emerald Advisers, LLC	$45.1M	2.5%	375,858	Added
Next Century Growth Investors LLC	$43.7M	2.4%	364,467	Added
UBS Group AG	$41.3M	2.3%	344,287	Added
JPMorgan Chase & Co	$41.0M	2.2%	340,371	Added
Ameriprise Financial Inc	$38.5M	2.1%	320,612	Added
Oberweis Asset Management Inc/	$35.9M	2.0%	299,030	New
Wells Fargo & Company	$32.6M	1.8%	271,554	Added
Napean Trading & Investment Co (Singapore) PTE Ltd	$28.0M	1.5%	233,333	Unchanged
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	$26.9M	1.5%	223,933	Trimmed
Emerald Mutual Fund Advisers Trust	$24.5M	1.3%	203,990	Added
Alliancebernstein L.p.	$20.7M	1.7%	262,103	Added
Penn Capital Management Company, LLC	$15.5M	0.8%	129,602	Added
BNP Paribas Financial Markets	$14.7M	0.8%	122,527	Added
Goldman Sachs Group Inc	$14.4M	0.8%	120,325	Added

Share of 13F holdings is each fund's shares as a share of the 15,278,720 BLLN shares all 13F filers reported, not of shares outstanding.

Biggest buyers in Q2 2026

Vanguard Portfolio Management LLC Added+$82.8M
Vanguard Capital Management LLC Added+$74.0M
Invesco Ltd. Added+$51.5M
Millennium Management LLC New+$51.0M
Fuller & Thaler Asset Management, Inc. New+$50.2M
Oberweis Asset Management Inc/ New+$35.9M
Next Century Growth Investors LLC Added+$32.9M
Price T Rowe Associates Inc Added+$32.7M
Wells Fargo & Company Added+$32.4M
UBS Group AG Added+$26.7M

Biggest sellers in Q2 2026

Civilization Ventures Management, LLC Trimmed-$108M
Baillie Gifford & Co Trimmed-$43.0M
NVP Associates, LLC Sold out-$40.5M
Capital International Investors Sold out-$14.1M
Massachusetts Financial Services Co Trimmed-$9.7M
PFM Health Sciences, LP Sold out-$7.0M
Two Sigma Investments, LP Trimmed-$6.3M
Deep Track Capital, LP Sold out-$3.9M
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Trimmed-$2.0M
Squarepoint Ops LLC Trimmed-$1.7M

The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $773M and sold $243M; 49 added and 13 trimmed.

Schedule 13D and 13G filings on BLLN

Owners of more than 5% must file within days, so these can be newer than the 13F data.

2026-02-17Atay Oguzhan SCHEDULE 13G filed by BillionToOne Inc.Schedule 13G
2026-02-13NeoTribe Ventures I, L.P. SCHEDULE 13G filed by BillionToOne Inc.Schedule 13G
2026-01-21Humming Bird Ventures Management NV SCHEDULE 13D filed by BillionToOne Inc.Schedule 13D

Questions about BLLN ownership

Who owns BLLN stock?: 156 institutional investment managers reported BLLN positions in their Form 13F filings for Q2 2026, holding 15,278,720 shares worth $1.8B in total. Adams Street Partners LLC reported the largest position.
Are funds buying or selling BLLN?: In Q2 2026, 76 managers opened new BLLN positions, 49 added, 13 trimmed and 11 sold out. Managers that filed in both quarters added a net 3,928,196 shares.
How current is this BLLN institutional ownership data?: It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to BLLN by CUSIP. Options are left out. BLLN news and filings · BLLN insider trades · Top funds