William A. Koefoed - 15 Dec 2025 Form 4 Insider Report for OneStream, Inc. (OS)

Signature
/s/ Holly Koczot, attorney-in-fact
Issuer symbol
OS
Transactions as of
15 Dec 2025
Net transactions value
-$169,694
Form type
4
Filing time
16 Dec 2025, 18:23:52 UTC
Previous filing
12 Dec 2025
Next filing
05 Jan 2026

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Koefoed William A Chief Financial Officer C/O ONESTREAM, INC., 191 N. CHESTER STREET, BIRMINGHAM /s/ Holly Koczot, attorney-in-fact 16 Dec 2025 0001642337

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OS Class A Common Stock Sale $169,694 -9,571 -4.4% $17.73 206,127 15 Dec 2025 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
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 21, 2025.
F2 The shares reported include unvested restricted stock units.