OS in the 13F filings

Onestream Inc · CUSIP 68278B107

Quarter

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024

Quarter end: 31 Dec 2025; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 22 Jan 2026
Managers listing it: 23; at least, of 95 tracked, among listed positions
Comparable managers: 92; filed both Q3 2025 and Q4 2025; 2 listed it in both
Shares listed: 13,318,845; combined, among listed positions
Reported value: $245m; combined, at the quarter end

Among the 92 comparable managers: 14 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +752,323.

Managers listing OS in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, 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

23 of 23 holders

				Action		Filing
Marshall Wace LLP	2,786,155	$51m	under 0.1%	Added	+304,238	13 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC	2,272,311	$42m	under 0.1%	Added	+1,871,452	17 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP	1,342,754	$25m	under 0.1%	Added	+81,202	17 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC	1,281,694	$24m	under 0.1%	Trimmed	-46,372	27 Oct 2026 (the filing on sec.gov)
Moore Capital Management LP	1,204,698	$22m	0.32%	New	new	17 Feb 2026 (the filing on sec.gov)
MFS Investment Management	1,050,802	$19m	under 0.1%	Trimmed	-373,066	22 Jan 2026 (the filing on sec.gov)
Point72 Asset Management LP	470,765	$8.7m	under 0.1%	New	new	17 Feb 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP	442,851	$8.1m	0.06%	New	new	17 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	409,625	$7.5m	under 0.1%	New	new	17 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	353,662	$6.5m	under 0.1%	Trimmed	-82,416	17 Feb 2026 (the filing on sec.gov)
Millennium Management LLC	335,581	$6.2m	under 0.1%	Trimmed	-368,195	17 Feb 2026 (the filing on sec.gov)
Soros Fund Management LLC	330,000	$6.1m	0.07%	Added	+7,400	13 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC	290,426	$5.3m	under 0.1%	New	new	17 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC	240,041	$4.4m	under 0.1%	Added	+174,157	12 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp	177,462	$3.3m	under 0.1%	Added	+143,794	17 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP	127,208	$2.3m	under 0.1%	Trimmed	-450,260	17 Feb 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP	70,922	$1.3m	under 0.1%	New	new	13 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	45,061	$828k	under 0.1%	Trimmed	-1,077	17 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	29,294	$539k	under 0.1%	Held	0	17 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	19,855	$365k	under 0.1%	Added	+2,700	17 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC	13,754	$253k	under 0.1%	New	new	17 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC	13,700	$252k	under 0.1%	Trimmed	-322,109	13 Feb 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP	10,224	$188k	under 0.1%	Trimmed	-3,128	17 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Citadel Advisors LLCexisting position · 2,272,311 shares now+1,871,452
Moore Capital Management LPnew position · 1,204,698 shares now+1,204,698
Point72 Asset Management LPnew position · 470,765 shares now+470,765
ExodusPoint Capital Management LPnew position · 442,851 shares now+442,851
Balyasny Asset Management LLCnew position · 409,625 shares now+409,625

Reductions

Susquehanna International Group LLPexisting position · 127,208 shares now-450,260
MFS Investment Managementexisting position · 1,050,802 shares now-373,066
Millennium Management LLCexisting position · 335,581 shares now-368,195
Verition Fund Management LLCexisting position · 13,700 shares now-322,109
Voloridge Investment Management LLCexisting position · 353,662 shares now-82,416

New positions and exits

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

New (7)

Exited (6)

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.

7 in Q3 2024 to 3 in Q1 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.

Choose a stock to compare with OS →

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 OS, latest filings →Back to the 13F Explorer →

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Quarter	Holders	Reported value	Buyers	Sellers
Q3 2024	7	$95m	7	0
Q4 2024	7	$73m	7	3
Q1 2025	3	$57m	2	2
Q2 2025	6	$150m	4	2
Q3 2025	3	$54m	2	1
Q4 2025	4	$88m	14	14
Q1 2026	3	$118m	15	13