OneStream, Inc.
OS • XNYS
OneStream, Inc. is a publicly traded company on XNYS, led by Thomas Shea, with a market cap of $3.3B. As of Q3 2025, 42% of shares are held by 182 institutional investors, with T. Rowe Price Investment Management, Inc. as the largest holder at 5.04%.
CEOThomas Shea
Market Cap$3.3B
Overview
Overview of institutional ownership in OS as of Q3 2025 with a market cap of $3.4B
All Institutions
- Institutions
- 182
- Value Held
- $1.5B
- Shares Held
- 78.7M
- Avg Position
- $8.0M
- Median Position
- $704.5K
Hedge Funds
- Hedge Funds
- 30
- Value Held
- $182.0M
- Shares Held
- 9.9M
- Avg Position
- $6.1M
- Median Position
- $2.8M
Ownership Breakdown
Based on market cap of $3.4B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in OS as of Q3 2025
| Institution | Position Value |
|---|---|
T T. Rowe Price Investment Management, Inc. Insurance Manager | $172.9M 0.11% of portfolio |
 VANGUARD GROUP INC Institution | $158.6M 0.00% of portfolio |
 KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC Long Only Manager | $114.5M 0.28% of portfolio |
T TEMASEK HOLDINGS LTD Institution | $78.6M 0.28% of portfolio |
 DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP Hedge Fund•Value | $70.8M 2.39% of portfolio |
B BROWN ADVISORY INC RIA/Wealth | $67.2M 0.09% of portfolio |
C Champlain Investment Partners, LLC Long Only Manager | $53.2M 0.40% of portfolio |
 ALLIANCEBERNSTEIN L.P. Long Only Manager | $49.0M 0.02% of portfolio |
 TimesSquare Capital Management, LLC Long Only Manager | $46.9M 0.67% of portfolio |
 Marshall Wace LLP Institution | $45.7M 0.05% of portfolio |
Net Capital Flow
Institutional buying and selling activity for OS in Q3 2025
- Traded
- −$71.7M
- Buyers
- 102
- Sellers
- 108
- Total Bought
- +$207.6M
- Total Sold
- −$279.3M
- Avg Position
- $6.3M
Biggest Buyers
| Institution | Net Bought |
|---|---|
T TEMASEK HOLDINGS LTD Institution | +$24.1M +1.3M shares |
 WELLINGTON MANAGEMENT CO LLP Long Only Manager | +$23.3M +1.3M shares |
B BROWN ADVISORY INC RIA/Wealth | +$19.2M +1.0M shares |
VANGUARD GROUP INC Institution | +$14.5M +786.4K shares |
 SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | +$10.4M +565.0K shares |
Marshall Wace LLP Institution | +$9.1M +492.8K shares |
 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Long Only Manager | +$6.6M +360.1K shares |
T T. Rowe Price Investment Management, Inc. Insurance Manager | +$6.6M +357.2K shares |
E EVERGREEN CAPITAL MANAGEMENT LLC Institution | +$6.4M +346.8K shares |
 Verition Fund Management LLC Hedge Fund•Multi-Strategy | +$5.9M +318.4K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
 GOLDMAN SACHS GROUP INC Institution | −$54.6M −3.0M shares |
C Champlain Investment Partners, LLC Long Only Manager | −$16.4M −888.8K shares |
 CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | −$14.9M −809.3K shares |
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC Long Only Manager | −$12.2M −663.1K shares |
D D. E. Shaw & Co., Inc. Institution | −$10.5M −371.3K shares |
 JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | −$10.4M −366.7K shares |
 OZ MANAGEMENT LP Hedge Fund•Multi-Strategy | −$9.9M −350.0K shares |
A AMERICAN CENTURY COMPANIES INC Institution | −$9.3M −506.9K shares |
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy | −$8.7M −474.5K shares |
 Ghisallo Capital Management LLC Hedge Fund•Multi-Strategy | −$8.5M −300.0K shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited OS in Q3 2025
- New Positions
- 42
- New Value
- $53.9M
- Exited Positions
- 50
- Exited Value
- $103.0M
New Positions
| Institution | Position Value |
|---|---|
WELLINGTON MANAGEMENT CO LLP Long Only Manager | $23.3M 1.3M shares |
E EVERGREEN CAPITAL MANAGEMENT LLC Institution | $6.4M 346.8K shares |
 ARMISTICE CAPITAL, LLC Hedge Fund•Long/Short | $4.6M 250.0K shares |
 KORNITZER CAPITAL MANAGEMENT INC /KS Long Only Manager | $4.5M 245.6K shares |
O OSSIAM Institution | $2.4M 129.2K shares |
 Whetstone Capital Advisors, LLC Hedge Fund•Long/Short | $2.1M 112.3K shares |
 Advantage Alpha Capital Partners LP Hedge Fund•Market Neutral | $1.6M 88.2K shares |
C Clearline Capital LP Hedge Fund•Event Driven | $930.3K 50.5K shares |
 Graham Capital Management, L.P. Hedge Fund•Multi-Strategy | $697.8K 37.9K shares |
 Gibbs Wealth Management RIA/Wealth | $616.8K 33.5K shares |
Exited Positions
| Institution | Previous Position |
|---|---|
D D. E. Shaw & Co., Inc. Institution | $10.5M 371.3K shares |
JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | $10.4M 366.7K shares |
OZ MANAGEMENT LP Hedge Fund•Multi-Strategy | $9.9M 350.0K shares |
Ghisallo Capital Management LLC Hedge Fund•Multi-Strategy | $8.5M 300.0K shares |
 ING INVESTMENT MANAGEMENT LLC Insurance Manager | $7.3M 258.8K shares |
 Centiva Capital, LP Hedge Fund•Multi-Strategy | $5.8M 205.0K shares |
 Fortress Investment Group LLC RIA/Wealth | $5.6M 198.8K shares |
 BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy | $5.2M 182.5K shares |
 CAPSTONE INVESTMENT ADVISORS, LLC Hedge Fund•Multi-Strategy | $5.0M 175.0K shares |
 Woodline Partners LP Hedge Fund•Long/Short | $4.8M 169.6K shares |
Options Activity
Institutions with the largest Call and Put options positions in OS as of Q3 2025
- Call Positions
- 10
- Call Value
- $10.3M
- Put Positions
- 5
- Put Value
- $3.7M
Call Positions
| Institution | Position Value |
|---|---|
 MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy | $3.8M 2.0K contracts |
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $2.1M 1.1K contracts |
Verition Fund Management LLC Hedge Fund•Multi-Strategy | $1.8M 987.0 contracts |
J JANE STREET GROUP, LLC Institution | $584.2K 317.0 contracts |
 BANK OF AMERICA CORP /DE/ Institution | $528.9K 287.0 contracts |
W WOLVERINE TRADING, LLC Institution | $505.4K 267.0 contracts |
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $364.9K 198.0 contracts |
D DRW Securities, LLC Institution | $325.2K 179.0 contracts |
 TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy | $208.3K 113.0 contracts |
 Walleye Trading LLC RIA/Wealth | $112.4K 61.0 contracts |
Put Positions
| Institution | Position Value |
|---|---|
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $2.0M 1.1K contracts |
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $742.7K 403.0 contracts |
J JANE STREET GROUP, LLC Institution | $517.9K 281.0 contracts |
W WOLVERINE TRADING, LLC Institution | $372.9K 197.0 contracts |
Walleye Trading LLC RIA/Wealth | $134.5K 73.0 contracts |
Most Committed Institutions
Institutions with OS as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP Hedge Fund•Value | 2.39% $70.8M |
0.78% $3.8M | |
S SEVEN GRAND MANAGERS, LLC Hedge Fund•Multi-Strategy | 0.73% $9.2M |
TimesSquare Capital Management, LLC Long Only Manager | 0.67% $46.9M |
Whetstone Capital Advisors, LLC Hedge Fund•Long/Short | 0.57% $2.1M |
2 2Xideas AG Institution | 0.53% $2.5M |
Advantage Alpha Capital Partners LP Hedge Fund•Market Neutral | 0.49% $1.6M |
 Burkehill Global Management, LP Hedge Fund•Event Driven | 0.43% $7.4M |
C Champlain Investment Partners, LLC Long Only Manager | 0.40% $53.2M |
 WEST PACES ADVISORS INC. RIA/Wealth | 0.31% $1.6M |
Hedge Fund Spotlight
Discover hedge funds investing in OS
T
TWINBEECH CAPITAL LP
Hedge Fund • Quant
Portfolio ManagerJinghua (Nmn) Yan
- Portfolio Value
- $2.5B
- Positions
- 536
- Last Reported
- Q3 2025
Sector Allocation
Position in OneStream, Inc.
- Market Value
- $336.3K
- Shares Held
- 18.2K
- Portfolio Weight
- 0.01%
- Owned Since
- 2025-Q2
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Household & Personal Products Consumer Defensive | $31.9M | 1.26% | |
Industrial - Machinery Industrials | $30.0M | 1.18% | |
Medical - Devices Healthcare | $29.8M | 1.18% |
