Sec Form 4 Filing - Burkland Michael @ OneStream, Inc. - 2024-11-25

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Burkland Michael 2. Issuer Name and Ticker or Trading Symbol OneStream, Inc. [ OS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ONESTREAM, INC., 191 N. CHESTER STREET 3. Date of Earliest Transaction (MM/DD/YY) 11/25/2024 (Street) BIRMINGHAM, MI48009 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 11/25/2024 C( 1 ) 9,541 A 9,541 I See Footnote ( 2 ) Class A Common Stock 11/27/2024 S( 3 ) 9,541 D $ 31 ( 3 ) 0 I See Footnote ( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Common Units ( 4 ) 11/25/2024 C( 4 ) 9,541 ( 5 ) ( 5 ) Class D Common Stock 9,541 $ 0 486,057 I See Footnote ( 2 ) Class D Common Stock ( 4 ) 11/25/2024 C( 4 ) 9,541 ( 6 ) ( 6 ) Class A Common Stock 9,541 $ 0 9,541 I See Footnote ( 2 ) Class D Common Stock ( 1 ) 11/25/2024 C( 1 ) 9,541 ( 6 ) ( 6 ) Class A Common Stock 9,541 $ 0 0 I See Footnote ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Burkland Michael C/O ONESTREAM, INC. 191 N. CHESTER STREET BIRMINGHAM, MI48009 X Signatures /s/ Holly Koczot, attorney-in-fact 11/27/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )Held of record by the Burkland Family Trust dated 1/28/1997 (the "Burkland Trust"), of which the Reporting Person is trustee. By virtue of his relationship, the Reporting Person may be deemed to hold voting and dispositive power with respect to the securities held by the the Burkland Trust. ( 3 )As previously disclosed in the Issuer's prospectus dated November 14, 2024, filed with the Securities and Exchange Commission on November 15, 2024, on November 18, 2024, the Issuer completed an underwritten public offering of Class A Common Stock (the "November 2024 Follow-On Offering"). In connection with the underwriters' exercise of their option to purchase additional shares of Class A Common Stock in the November 2024 Follow-On Offering, the holder sold an additional 9,541 shares of Class A Common Stock at a public offering price of $31 per share, or a net per share price of $29.9925 after deducting $1.0075 per share of underwriting discounts and commissions. ( 4 )On November 25, 2024, the holder redeemed 9,541 Common Units of OneStream Software LLC, and 9,541 shares of the holder's Class C Common Stock were cancelled, in exchange for 9,541 shares of Class D Common Stock. ( 5 )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. ( 6 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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