Ken Hohenstein - 16 Mar 2026 Form 4 Insider Report for OneStream, Inc. (OS)

Role
Chief Revenue Officer
Signature
/s/ Holly Koczot, attorney-in-fact
Issuer symbol
OS
Transactions as of
16 Mar 2026
Net transactions value
-$1,396,430
Form type
4
Filing time
18 Mar 2026, 16:43:26 UTC
Previous filing
12 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Hohenstein Ken Chief Revenue Officer C/O ONESTREAM, INC., 191 N. CHESTER STREET, BIRMINGHAM /s/ Holly Koczot, attorney-in-fact 18 Mar 2026 0002031265

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OS Class A Common Stock Options Exercise +9,204 +0.93% $10.65* 994,775 16 Mar 2026 Direct F1
transaction OS Class A Common Stock Options Exercise +40,000 +4% $14.51* 1,034,775 16 Mar 2026 Direct F1
transaction OS Class A Common Stock Sale $1,160,230 -49,204 -4.8% $23.58 985,571 16 Mar 2026 Direct F1, F2
transaction OS Class A Common Stock Options Exercise +10,000 +1% $10.65* 995,571 17 Mar 2026 Direct F1
transaction OS Class A Common Stock Sale $236,200 -10,000 -1% $23.62 985,571 17 Mar 2026 Direct F1, F2
holding OS Class A Common Stock 790,279 16 Mar 2026 See Footnote F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction OS Stock Option (right to buy) Options Exercise -9,204 -100% $0.000000* 6 16 Mar 2026 Class A Common Stock 9,204 $10.65 Direct F4
transaction OS Stock Option (right to buy) Options Exercise -40,000 -11% $0.000000* 340,322 16 Mar 2026 Class A Common Stock 40,000 $14.51 Direct F5
transaction OS Stock Option (right to buy) Options Exercise -10,000 -7.2% $0.000000* 128,508 17 Mar 2026 Class A Common Stock 10,000 $10.65 Direct F6
* 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 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, 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.
F5 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.
F6 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.