ONESTREAM INC SEC Filings

Sridharan Baskar filed an initial Form 3 reporting his relationship to OneStream, Inc. (OS) as a director. The event date is 10/03/2025. The filing states no securities are beneficially owned by the reporting person. The form is signed by Holly Koczot, attorney-in-fact on 10/07/2025, indicating the filing was executed by an authorized representative.

John Kinzer, a director of OneStream, Inc. (OS), reported a sequence of transactions in September 2025. On September 18, 2025 he converted 30,000 shares of Class D Common Stock into 30,000 shares of Class A Common Stock. On September 19, 2025 those 30,000 Class A shares were sold at $20 per share under a Rule 10b5-1 trading plan adopted on November 22, 2024. The filing notes that some reported shares include unvested restricted stock units and that the shares are held by the John E. Kinzer Trust, of which the reporting person is a trustee. The Form 4 shows holdings tied to Common Units and Class D/Common C mechanics, including a post-transaction beneficial ownership figure for Class D Common Stock of 300,997 shares and 30,000 Class A shares referenced where applicable.

OneStream, Inc. (OS) Form 144 filing reports a proposed sale of 30,000 Class A shares through Fidelity Brokerage Services with an aggregate market value of $600,000. The filing shows the shares were originally acquired as Pre-IPO shares on 05/31/2019 and paid for in cash. The issuer has 88,136,155 shares outstanding. The filing also discloses a prior sale by the same beneficial owner, the John E Kinzer Trust, of 30,000 Class A shares on 06/20/2025 that generated gross proceeds of $847,932.24. The filer certifies no undisclosed material adverse information.

Ken Hohenstein, Chief Revenue Officer of OneStream, Inc. (OS), reported transactions dated 09/16/2025 involving both non-derivative shares and stock options. He acquired 40,000 shares via option exercises at an exercise price of $10.65 and concurrently sold 40,000 shares under a Rule 10b5-1 trading plan for a weighted average sale price of $18.69. Following these transactions he beneficially owned 1,037,062 shares before the sale line and 997,062 shares after the sale (direct), and held 790,279 shares indirectly through the Hohenstein Purple Elephant Trust. He also holds two option grants exercisable through 2031 and 2033 and unvested restricted stock units are included in the reported totals.

OneStream, Inc. Chief Financial Officer William A. Koefoed reported a sale of 8,943 shares of Class A common stock on 09/15/2025 at a price of $19.03 per share. After the transaction he beneficially owned 221,983 shares; the reported total includes unvested restricted stock units. The filing notes the sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on February 21, 2025. The Form 4 was signed on behalf of Mr. Koefoed and dated 09/16/2025.

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.

OneStream, Inc. (OS) filed a Form 144 notifying the proposed sale of 8,943 Class A shares to be executed through Fidelity Brokerage Services on or about 09/15/2025 at an aggregate market value of $170,185.29. The shares were acquired on 09/10/2025 upon restricted stock vesting and are described as compensation for the holder.

The filing lists three prior Class A sales by the same person in the past three months: 9,354 shares on 06/16/2025 for $260,976.60, 25,000 shares on 06/25/2025 for $669,250.00, and 25,000 shares on 07/25/2025 for $625,000.00. Total outstanding Class A shares reported: 88,136,155.

Jonathan D. Mariner, a director of OneStream, Inc. (OS), sold 141 shares of Class A common stock on 09/03/2025 under a Rule 10b5-1 trading plan. The transactions were executed at a weighted-average price of $20.07 per share within a reported price range of $20.00 to $20.16. After the sale, the reporting person beneficially owned 33,509 shares, which the filing states include unvested restricted stock units. The Form 4 indicates the sale was effected pursuant to a 10b5-1 plan adopted on February 28, 2025 and was reported by an attorney-in-fact on behalf of the reporting person.