OS Form 144: 40,000 Class A shares to be sold via Fidelity on 09/16/2025

Rhea-AI Filing Summary

OneStream, Inc. (OS) Form 144 shows a proposed sale of 40,000 Class A shares to be executed on 09/16/2025 through Fidelity Brokerage Services (900 Salem Street, Smithfield, RI) on the NASDAQ, with an aggregate market value listed at $740,000.00. The filing reports the shares were acquired via stock options granted on 06/30/2022 (30,000 shares) and 03/06/2023 (10,000 shares), and payment for these securities is noted as cash on the sale date. The filer has completed three prior sales of Class A shares in the past three months (three separate 20,000-share sales on 06/18/2025, 07/18/2025, and 08/18/2025) generating gross proceeds of $565,600.00, $502,400.00, and $431,200.00, respectively. The issuer name and several filer contact fields are not provided in the visible content.

Positive

• Planned sale routed through a reputable broker (Fidelity Brokerage Services), supporting orderly execution
• Acquisitions are documented as stock options (06/30/2022 and 03/06/2023), matching the securities being sold
• Previous recent sales disclosed, indicating consistency in reporting and transparency about past dispositions

Negative

• None.

Insights

Securities Analyst

TL;DR: Insider proposes a routine sale of 40,000 Class A shares acquired via prior option grants; recent monthly sales also reported.

The filing documents a planned single-block sale of 40,000 Class A shares on 09/16/2025 through a major broker, with acquisition traced to option grants in 2022 and 2023 and cash payment at sale. The filing also discloses three prior monthly dispositions of 20,000 shares each over June–August 2025 with declining gross proceeds across those dates. From an equity-impact perspective, the disclosed amounts appear operationally routine and are consistent with option exercise followed by sale. The filing lacks the issuer name in the visible sections, which limits cross-referencing with other disclosures.

Compliance/Risk Analyst

TL;DR: Documentation shows standard Rule 144 notice and seller certification; some issuer and filer contact fields are missing.

The Form 144 includes the required sale schedule, acquisition dates and nature (options granted), broker identification, and gross proceeds for recent sales, and contains the signature/representation language attesting no undisclosed material adverse information. Missing issuer identification and filer contact details in the provided excerpt are compliance-relevant because they impede verification; however, the core sale-specific fields are completed. Overall, the filing meets core procedural requirements visible here but would benefit from the omitted identifying details for full transparency.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	40000	740000.00	88136155	09/16/2025	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	09/16/2025	Options Granted - 06/30/2022	Issuer			30000	09/16/2025	Cash
Class A	09/16/2025	Options Granted - 03/06/2023	Issuer			10000	09/16/2025	Cash

* 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
Kenneth Hohenstein 191 N. Chester Street Birmingham MI 48009	Class A	06/18/2025	20000	565600.00
Kenneth Hohenstein 191 N. Chester Street Birmingham MI 48009	Class A	07/18/2025	20000	502400.00
Kenneth Hohenstein 191 N. Chester Street Birmingham MI 48009	Class A	08/18/2025	20000	431200.00

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What is being sold in the OneStream, Inc. (OS) Form 144?

The filing proposes the sale of 40,000 Class A shares on 09/16/2025 through Fidelity Brokerage Services on NASDAQ, with an aggregate market value of $740,000.00.

How were the shares being sold acquired according to the Form 144?

The shares were acquired via stock options granted on 06/30/2022 (30,000 shares) and 03/06/2023 (10,000 shares), and payment at sale is listed as cash.

Has the seller recently sold other OneStream shares?

Yes. The seller reported three sales of 20,000 Class A shares on 06/18/2025, 07/18/2025, and 08/18/2025, with gross proceeds of $565,600, $502,400, and $431,200, respectively.

Does the filing include issuer and filer contact details?

In the provided content the issuer name and several filer contact fields are not included or are blank, which prevents full identification within this excerpt.

What certification does the seller make on this Form 144?

The seller signs a representation that they do not know any material adverse information about the issuer that has not been publicly disclosed and references Rule 10b5-1 plan language if applicable.