OneStream, Inc. — Director's Dealing 2026

Feb 19, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OneStream, Inc. (OS)
CIK: 0001889956
Period of Report: 2026-02-17

Reporting Person: Hohenstein Ken (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-17	Class A Common Stock	M	20000	$10.65	Acquired	1010961	Direct
2026-02-17	Class A Common Stock	M	40000	$14.51	Acquired	1050961	Direct
2026-02-17	Class A Common Stock	S	60000	$23.46	Disposed	990961	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-17	Stock Option (right to buy)	$10.65	M	10000	Disposed	2033-03-05	Class A Common Stock (10000)	Direct
2026-02-17	Stock Option (right to buy)	$10.65	M	10000	Disposed	2031-12-04	Class A Common Stock (10000)	Direct
2026-02-17	Stock Option (right to buy)	$14.51	M	40000	Disposed	2034-03-10	Class A Common Stock (40000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	790279	Indirect

Footnotes

F1: The shares reported include unvested restricted stock units.

F2: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 22, 2025.

F3: Shares held by the Hohenstein Purple Elephant 2019 Irrevocable Grantor Trust (the "Hohenstein Purple Elephant Trust"). The Reporting Person may be deemed to have voting and dispositive power over the shares held by the Hohenstein Purple Elephant Trust.

F4: One-fourth of the shares subject to the option vested on February 15, 2024, and 1/48th of the shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to be a service provider through the applicable vesting date.

F5: One-fourth of the shares subject to the option vested on February 15, 2023, and 1/48th of the shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to be a service provider through the applicable vesting date.

F6: One-fourth of the shares subject to the option vested on February 15, 2025, and 1/48th of the shares subject to the option shall vest each month thereafter, subject to the Reporting Person continuing to be a service provider through the applicable vesting date.