OneStream, Inc. Class A Common Stock
OneStream, Inc. Class A Common Stock (OS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · OS · as of Sep 30, 2025
Ownership Breakdown
200
Institutional Holders
▲ 9 vs Q2
$1.45B
Total Inst. Value
▼ $1.01B vs Q2
99.80M
Shares Outstanding
freeFloat 96.33%
78.88M
13F Shares Held
▼ 8.22M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
OS largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. services-prepackaged software | 9.38M | 5.26% | 5.26% | $172.92B | Nov 14, 2025 | ▲ 357.2K |
VANGUARD GROUP INC services-prepackaged software | 8.61M | 4.83% | 4.83% | $158.61B | Nov 7, 2025 | ▲ 786.4K |
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC services-prepackaged software | 6.21M | 3.48% | 3.48% | $114.49B | Nov 13, 2025 | ▼ 663.1K |
TEMASEK HOLDINGS (PRIVATE) LTD services-prepackaged software | 4.27M | 2.39% | 2.39% | $78.64B | Nov 14, 2025 | ▲ 1.31M |
DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP services-prepackaged software | 3.84M | 2.15% | 2.15% | $70.76B | Nov 14, 2025 | — held |
BROWN ADVISORY INC services-prepackaged software | 3.65M | 2.04% | 2.04% | $67.20B | Nov 14, 2025 | ▲ 1.04M |
CHAMPLAIN INVESTMENT PARTNERS, LLC services-prepackaged software | 2.89M | 1.62% | 1.62% | $53.19B | Nov 12, 2025 | ▼ 888.8K |
ALLIANCEBERNSTEIN L.P. services-prepackaged software | 2.66M | 1.49% | 1.49% | $49.02B | Nov 14, 2025 | ▲ 314.3K |
TIMESSQUARE CAPITAL MANAGEMENT, LLC services-prepackaged software | 2.55M | 1.43% | 1.43% | $46.91B | Nov 7, 2025 | ▼ 121.2K |
MARSHALL WACE, LLP services-prepackaged software | 2.48M | 1.39% | 1.39% | $45.74B | Nov 13, 2025 | ▲ 492.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
25
Increased
+6.98M shares4
New Positions
first time holders18
Decreased
−8.36M shares0
Sold Out
fully exitedNet shares change (top 50)
1.37M
+6.98M / −8.36M
Net new holders
+11
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
OS insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
43
Sell transactions
0.00
Buy/Sell ratio
$15M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
K-PRIME AG Financing LP 10 percent owner | Apr 1, 2026 | J-Other | 1,136,425 | — | — | 0 | Form 4 ↗ |
K-PRIME AG Financing LP 10 percent owner | Apr 1, 2026 | J-Other | 45,795,416 | — | — | 0 | Form 4 ↗ |
KKR Dream Holdings LLC 10 percent owner | Apr 1, 2026 | J-Other | 1,136,425 | — | — | 0 | Form 4 ↗ |
KKR Dream Holdings LLC 10 percent owner | Apr 1, 2026 | J-Other | 45,795,416 | — | — | 0 | Form 4 ↗ |
KKR TFO Partners L.P. 10 percent owner | Apr 1, 2026 | J-Other | 1,136,425 | — | — | 0 | Form 4 ↗ |
KKR TFO Partners L.P. 10 percent owner | Apr 1, 2026 | J-Other | 45,795,416 | — | — | 0 | Form 4 ↗ |
KKR NGT (Dream) Blocker Parent L.P. 10 percent owner | Apr 1, 2026 | J-Other | 1,136,425 | — | — | 0 | Form 4 ↗ |
KKR NGT (Dream) Blocker Parent L.P. 10 percent owner | Apr 1, 2026 | J-Other | 45,795,416 | — | — | 0 | Form 4 ↗ |
KKR Group Partnership L.P. 10 percent owner | Apr 1, 2026 | J-Other | 1,136,425 | — | — | 0 | Form 4 ↗ |
KKR Group Partnership L.P. 10 percent owner | Apr 1, 2026 | J-Other | 45,795,416 | — | — | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
OneStream, Inc. Class A Common Stock (OS) is primarily owned by institutional investors, who hold approximately 79.0% of total shares outstanding. Company insiders own approximately 3.67%, while retail and public investors account for the remaining 17.29%.
The largest institutional shareholder of OneStream, Inc. Class A Common Stock is T. ROWE PRICE INVESTMENT MANAGEMENT, INC., holding approximately 9.38 million shares — equal to 5.26% of outstanding shares — as of September 30, 2025.
A total of 200 institutional investors currently hold OS stock, with a combined institutional value of approximately $1.45 billion as of the most recent 13F filing period.
Frequently asked questions
OS ownershipOneStream, Inc. Class A Common Stock (OS) is primarily owned by institutional investors, who hold approximately 79.0% of shares. The largest shareholder is T. ROWE PRICE INVESTMENT MANAGEMENT, INC. with a 5.26% stake. Company insiders hold 3.67%. Data sourced from SEC Form 13F as of September 30, 2025.