John Kinzer - 18 Sep 2025 Form 4 Insider Report for OneStream, Inc. (OS)

Role
Director
Signature
/s/ Holly Koczot, attorney-in-fact
Issuer symbol
OS
Transactions as of
18 Sep 2025
Net transactions value
-$600,000
Form type
4
Filing time
22 Sep 2025, 16:40:54 UTC
Previous filing
24 Jun 2025
Next filing
04 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Kinzer John Director C/O ONESTREAM, INC., 191 N. CHESTER STREET, BIRMINGHAM /s/ Holly Koczot, attorney-in-fact 22 Sep 2025 0001621078

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OS Class A Common Stock Conversion of derivative security +30,000 30,000 18 Sep 2025 See Footnote F1, F2
transaction OS Class A Common Stock Sale $600,000 -30,000 -100% $20.00 0 19 Sep 2025 See Footnote F2, F3
holding OS Class A Common Stock 7,130 18 Sep 2025 Direct F4

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 Common Units Conversion of derivative security $0 -30,000 -9.1% $0.000000 300,997 18 Sep 2025 Class D Common Stock 30,000 See Footnote F2, F5, F6
transaction OS Class D Common Stock Conversion of derivative security $0 +30,000 $0.000000 30,000 18 Sep 2025 Class A Common Stock 30,000 See Footnote F2, F5, F7
transaction OS Class D Common Stock Conversion of derivative security $0 -30,000 -100% $0.000000 0 18 Sep 2025 Class A Common Stock 30,000 See Footnote F1, F2, F7
* 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 Class A Common Stock was acquired upon the conversion, at the holder's election, of Class D Common Stock held by the holder on a 1:1 basis.
F2 The shares are held by the John E. Kinzer Trust, of which the Reporting Person is a trustee.
F3 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 22, 2024.
F4 The shares reported include unvested restricted stock units.
F5 On September 18, 2025, the holder redeemed 30,000 Common Units of OneStream Software LLC, and 30,000 shares of the holder's Class C Common Stock were cancelled, in exchange for 30,000 shares of Class D Common Stock.
F6 The Common Units may be redeemed by the holder for shares of Class D Common Stock on a 1:1 basis, and an equal number of the holder's shares of Class C Common Stock (which have no economic rights) will be cancelled in connection with the redemption. The Common Units have no expiration date.
F7 The Class D Common Stock is convertible at any time, at the holder's election, into Class A Common Stock on a 1:1 basis. Each outstanding share of Class D Common Stock will automatically convert into one share of Class A Common Stock upon the earlier of (i) any transfer, whether or not for value, except for certain transfers exempted by the Issuer's amended and restated certificate of incorporation, (ii) death or incapacity (if the holder is a natural person), and (iii) the first trading day following the seventh anniversary of the Issuer's initial public offering.