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Free · no sign-up · Q2 2026

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.

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.

Managers on file listing it
047Q3 2024: 77Q4 2024: 77Q1 2025: 3325Q2 2025: 66Q3 2025: 33Q4 2025: 44Q1 2026: 3326
  • Q3 2024: 7
  • Q4 2024: 7
  • Q1 2025: 3
  • Q2 2025: 6
  • Q3 2025: 3
  • Q4 2025: 4
  • Q1 2026: 3
Their combined reported value
$0$75m$150mQ3 2024: $95m$95mQ4 2024: $73m$73mQ1 2025: $57m$57m25Q2 2025: $150m$150mQ3 2025: $54m$54mQ4 2025: $88m$88mQ1 2026: $118m$118m26
  • 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

Largest increases, by shares

Largest decreases, by shares

No manager on file sold part of it.

Left it

No manager on file is shown leaving it.

ManagerValue over timeFirst listedLargestQ1 2026
Man Group PLCQ1 2026$53m$53m
Soros Fund Management LLCQ3 2024$44m$44m
Verition Fund Management LLCQ1 2026$21m$21m
Marshall Wace LLPQ2 2025$56mlast listed Q4 2025
Neuberger Berman Group LLCQ1 2025$45mlast listed Q2 2025
Capital World InvestorsQ3 2024$29mlast listed Q3 2024
Moore Capital Management LPQ4 2024$22mlast listed Q4 2025
Voloridge Investment Management LLCQ2 2025$19mlast listed Q2 2025
Holocene Advisors LPQ3 2024$19mlast listed Q2 2025
Durable Capital Partners LPQ3 2024$17mlast listed Q3 2024
Walleye Capital LLCQ2 2025$10mlast listed Q2 2025
ExodusPoint Capital Management LPQ4 2025$8.1mlast listed Q4 2025
Acadian Asset Management LLCQ4 2024$7.5mlast 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

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