BLLN in the 13F filings

BillionToOne Inc · CUSIP 090168105

Sector · Health care services and research

Quarter

Q3 2026 · early filers Q2 2026 Q1 2026 Q4 2025

Quarter end: 30 Jun 2026; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 3 Aug 2026
Managers listing it: 22; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q1 2026 and Q2 2026; 1 listed it in both
Shares listed: 4,794,212; combined, among listed positions
Reported value: $564m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 18 buyers (opened or added shares) and 7 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,041,614.

Managers listing BLLN in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

22 of 22 holders

				Action		Filing
T. Rowe Price Associates Inc	1,010,322	$121m	under 0.1%	Added	+272,804	14 Aug 2026 (the filing on sec.gov)
Baillie Gifford & Co	901,420	$108m	0.10%	Trimmed	-358,573	6 Aug 2026 (the filing on sec.gov)
Invesco Ltd	835,614	$100m	under 0.1%	Added	+429,102	14 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC	764,215	$92m	0.06%	Added	+55,001	27 Oct 2026 (the filing on sec.gov)
Millennium Management LLC	425,032	$51m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP	262,103	$21m	under 0.1%	Added	+38,852	14 Aug 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	117,063	$14m	0.06%	New	new	14 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC	96,600	$12m	under 0.1%	Added	+45,346	13 Aug 2026 (the filing on sec.gov)
MFS Investment Management	78,977	$9.5m	under 0.1%	Trimmed	-80,596	3 Aug 2026 (the filing on sec.gov)
Verition Fund Management LLC	57,000	$6.8m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP	54,598	$6.6m	under 0.1%	Added	+42,112	14 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP	44,662	$5.4m	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP	30,176	$3.6m	under 0.1%	Trimmed	-52,600	14 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.	25,981	$3.1m	under 0.1%	Added	+22,119	14 Aug 2026 (the filing on sec.gov)
Quantbot Technologies LP	24,651	$3.0m	0.12%	Added	+24,611	12 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp	21,517	$2.6m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Polen Capital Management LLC	16,975	$2.0m	under 0.1%	New	new	4 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC	15,155	$1.8m	under 0.1%	New	new	2 Sep 2026 (the filing on sec.gov)
Squarepoint Ops LLC	8,773	$1.1m	under 0.1%	Trimmed	-14,173	14 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP	1,838	$221k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Freestone Grove Partners LP	1,533	$184k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	7	$1k	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Invesco Ltdexisting position · 835,614 shares now+429,102
Millennium Management LLCnew position · 425,032 shares now+425,032
T. Rowe Price Associates Incexisting position · 1,010,322 shares now+272,804
Voloridge Investment Management LLCnew position · 117,063 shares now+117,063
Verition Fund Management LLCnew position · 57,000 shares now+57,000

Reductions

Baillie Gifford & Coexisting position · 901,420 shares now-358,573
MFS Investment Managementexisting position · 78,977 shares now-80,596
Two Sigma Investments LPexisting position · 30,176 shares now-52,600
Squarepoint Ops LLCexisting position · 8,773 shares now-14,173

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (10)

Exited (3)

Soros Fund Management LLCwas $1.1m
Brevan Howard Capital Management LPwas $609k
Walleye Capital LLCwas $470k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

3 in Q4 2025 to 5 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

BLLN and UNH →BLLN and ELV →BLLN and CI →Choose a stock to compare with BLLN →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own BLLN, latest filings →Back to the 13F Explorer →

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BLLN by quarter
Quarter	Holders	Reported value	Buyers	Sellers
Q4 2025	3	$162m	17	0
Q1 2026	2	$101m	11	10
Q2 2026	5	$219m	18	7