Which funds own OS
Onestream Inc in the Q2 2026 filings. None of the 91 current managers lists it among its largest positions this quarter. What is here is what they held before selling out.
- Managers holding
- 0
- at least, of 91 current
- Combined value
- $0
- as reported
- Opened
- 0
- new this quarter
- Added to
- 0
- already held
- Trimmed or sold out
- 14
- 14 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- Millennium Management LLC · Multi-strategy$59m held before
- Man Group PLC · Quantitative$53m held before
- Citadel Advisors LLC · Multi-strategy$46m held before
- Soros Fund Management LLC · Macro$44m held before
- AllianceBernstein LP · Long-only$28m held before
- Susquehanna International Group LLP · Quantitative$26m held before
- Marshall Wace LLP · Quantitative$24m held before
- Verition Fund Management LLC · Multi-strategy$21m held before
- Balyasny Asset Management LLC · Multi-strategy$20m held before
- Squarepoint Ops LLC · Multi-strategy$12m held before
- AQR Capital Management LLC · Quantitative$7.8m held before
- Fidelity (FMR LLC) · Long-only$1.1m held before
- T. Rowe Price Associates Inc · Long-only$500k held before
- GAMCO Investors Inc · Activist$400k held before
Ownership through time
At least 3 of the 95 managers whose filings are on file listed OS in Q1 2026, against 7 in Q3 2024. 1 manager fewer than in Q4 2025: 1 started a position; 1 listed it again; 3 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q3 2024: 7
- Q4 2024: 7
- Q1 2025: 3
- Q2 2025: 6
- Q3 2025: 3
- Q4 2025: 4
- Q1 2026: 3
- Q3 2024: $95m
- Q4 2024: $73m
- Q1 2025: $57m
- Q2 2025: $150m
- Q3 2025: $54m
- Q4 2025: $88m
- Q1 2026: $118m
Between the quarter ends of Q4 2025 and Q1 2026. Each change in shares is valued at the Q1 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q1 2026
- Man Group PLC$53m
Largest increases, by shares
- Man Group PLCnew: 2,204,520 shares+$53m
- Soros Fund Management LLC330,000 to 1,830,222 shares+$36m
Largest decreases, by shares
No manager on file sold part of it.
Left it
No manager on file is shown leaving it.
| Manager | Value over time | First listed | Largest | Q1 2026 |
|---|---|---|---|---|
| Man Group PLC | Q1 2026 | $53m | $53m | |
| Soros Fund Management LLC | Q3 2024 | $44m | $44m | |
| Verition Fund Management LLC | Q1 2026 | $21m | $21m | |
| Marshall Wace LLP | Q2 2025 | $56m | last listed Q4 2025 | |
| Neuberger Berman Group LLC | Q1 2025 | $45m | last listed Q2 2025 | |
| Capital World Investors | Q3 2024 | $29m | last listed Q3 2024 | |
| Moore Capital Management LP | Q4 2024 | $22m | last listed Q4 2025 | |
| Voloridge Investment Management LLC | Q2 2025 | $19m | last listed Q2 2025 | |
| Holocene Advisors LP | Q3 2024 | $19m | last listed Q2 2025 | |
| Durable Capital Partners LP | Q3 2024 | $17m | last listed Q3 2024 | |
| Walleye Capital LLC | Q2 2025 | $10m | last listed Q2 2025 | |
| ExodusPoint Capital Management LP | Q4 2025 | $8.1m | last listed Q4 2025 | |
| Acadian Asset Management LLC | Q4 2024 | $7.5m | last listed Q4 2024 |
What OS is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around OS →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
One email a week on what moved in the market and what it means for the people interviewing into it, with the 13F changes the quarter they are filed.
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