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OneStream, Inc. Director's Dealing 2025

Sep 5, 2025

31088_dirs_2025-09-04_7eb041a8-cfd3-45ea-9df3-b95371ef36e9.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OneStream, Inc. (OS)
CIK: 0001889956
Period of Report: 2025-09-03

Reporting Person: MARINER JONATHAN D (N/A)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-09-03 Class A Common Stock S 141 $20.07 Disposed 33509 Direct

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 28, 2025.

F2: Represents the weighted average share price of an aggregate total of 141 shares sold in the price range of $20.00 to $20.16, inclusive, by the Reporting Person. The Reporting Person undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer or any security holder of the issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

F3: The shares reported include unvested restricted stock units.