OS files Form 144 to sell 7,412 Class A shares

OS reports a Form 144 notice for the proposed disposition of 7,412 shares of Class A common stock tied to a restricted stock vesting event.

Rhea-AI Filing Summary

OS reports a Form 144 notice for the proposed disposition of 7,412 shares of Class A common stock tied to a restricted stock vesting event. The filing lists the proposed sale method as Issuer placement on 03/10/2026. The filing also records prior dispositions of 6,011 Class A shares on 12/11/2025.

Insights

Securities Compliance Analyst

Form 144 records a planned sale of 7,412 vested shares and prior dispositions of 6,011 shares.

The notice identifies the source as restricted stock vesting and lists the method as Issuer on 03/10/2026, indicating the securities became available via compensation vesting.

Cash‑flow treatment and planned sale mechanics beyond the listed method are not detailed; subsequent filings or trade reports would show execution and proceeds.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does OS's Form 144 report about the 7,412 Class A shares?

The Form 144 reports a proposed disposition of 7,412 Class A shares tied to restricted stock vesting with an indicated sale method of Issuer on 03/10/2026.

Did the filing show any recent sales by insiders of OS (ticker OS)?

Yes. The filing lists prior dispositions of 6,011 Class A shares executed on 12/11/2025, recorded in the "Securities Sold During The Past 3 Months" section.

Who is listed as the broker or recipient for the proposed sale in the Form 144?

The filing shows Fidelity Brokerage Services LLC with an address in Smithfield, RI, associated with the Class A line; no further execution detail or proceeds recipient is provided in the excerpt.

Is the 7,412 share disposition an open‑market sale or compensation‑related transfer?

The disposition is linked to restricted stock vesting, indicating the shares arose from compensation; the filing labels the method as Issuer, not explicitly an open‑market trade.

Does the Form 144 excerpt state the cash proceeds expected from the sale?

The excerpt does not provide an explicit aggregate proceeds figure tied to the 7,412 shares; the filing lists numeric fields but does not label a clear total proceeds amount for this disposition.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/11/2026 - 11:53 AM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002098850
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	OneStream, Inc.
SEC File Number	001-42187
Address of Issuer	191 N. CHESTER STREET BIRMINGHAM MICHIGAN 48009
Phone	(248) 650-1490
Name of Person for Whose Account the Securities are To Be Sold	Leshinski Scott
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	7412	175516.16	99803647	03/11/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A	03/10/2026	Restricted Stock Vesting	Issuer			7412	03/10/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Scott Leshinski 191 N. Chester Street Birmingham MI 48009	Class A	12/11/2025	6011	109460.31

144: Remarks and Signature

Remarks
Date of Notice	03/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/13/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Corey Walter, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Scott Leshinski
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)