$BLLN

$114.07 +$2.60 (2.34%) Close

$BLLN Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 46.4M shares outstanding

Who owns BLLN?

By type of holder

Institutions 32.8% Insiders 1.3% Everyone else 65.9%

Concentration Top 10 holders own 50.4%

Hummingbird Ventures Management NV 17.0% · Firat Ileri 17.0%

Institutional ownership

32.8%

+8.4 pts vs last qtr

Institutional holders

154

+64 vs last qtr

Net shares bought

+3.9M

by institutions in Q2 2026

New / sold out

76 / 12

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Vanguard Portfolio Management LLC +689.8K
Vanguard Capital Management LLC +617.0K

Biggest sellers in Q2 2026

Civilization Ventures Management, LLC −1.1M
NVP Associates, LLC SOLD OUT −513.3K

Who is planning to sell?

Notices of proposed sale, last 12 months

$51.5M

51 notices from 6 people

Shares covered

477.6K

1.03% of the company

Arranged in advance

100%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Atay Oguzhan Officer 10b5-1 $26.7M
Tsao David Officer 10b5-1 $10.3M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+117.0%

+47.32% a year

Each share's claim on the business

−53.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$546K vs $29.1M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years0% Under 1 year100%

Quarterly turnover

39.6%

of institutional shares changed hands

Top 10 managers, median time held

2 quarters

Super Investors

Investment managers reporting BLLN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
AS Adams Street Partners LLC	1.7M	3.69%	Unchanged	Q4 '25	46.4%
Shares held by quarter Peak holding1.7M (Q4'25) Change over 8 quarters+1.7M Share of the company3.690% Adams Street Partners LLC's full portfolio →
BG Baillie Gifford & Co	901.4K	1.94%	−358.6K (−28.5%)	Q4 '25	0.1%
Shares held by quarter Peak holding1.3M (Q4'25) Change over 8 quarters+901.4K Share of the company1.940% Baillie Gifford & Co's full portfolio →

Adams Street Partners LLC

1.7M

% of company

3.69%

Change vs last qtr

Unchanged

Held since

Q4 '25

Baillie Gifford & Co

901.4K

% of company

1.94%

Change vs last qtr

−358.6K (−28.5%)

Held since

Q4 '25

28 more super investors behind a free account

See every manager holding BillionToOne, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting BLLN on Form N-PORT; together they hold 14.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$86.9M	724.1K	1.56%	0.00%	June 30, 2026
VS Vanguard Small-Cap Index Fund Vanguard Index Funds	$62.7M	522.9K	1.13%	0.03%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$86.9M

% of company

1.56%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Small-Cap Index Fund

Vanguard Index Funds

Position value

$62.7M

% of company

1.13%

% of the fund

0.03%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding BillionToOne, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HV Hummingbird Ventures Management NV 5%+ holder 13D · 19.6%	7.9M	17.00%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company17.000% Disclosed stake13D · 19.6% View the 13D/G filing →
FI Firat Ileri 5%+ holder 13D · 19.6%	7.9M	17.00%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company17.000% Disclosed stake13D · 19.6% View the 13D/G filing →

Hummingbird Ventures Management NV

5%+ holder13D · 19.6%

7.9M

% of company

17.00%

Change vs last qtr

—

Held since

—

Firat Ileri

5%+ holder13D · 19.6%

7.9M

% of company

17.00%

Change vs last qtr

—

Held since

—

1 more holders behind a free account

See every insider and 5%+ holder of BillionToOne, Inc..

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