Form 4: OneStream Director Jonathan Mariner Executes Pre-Arranged Stock Sale

OneStream, Inc. Director Jonathan D. Mariner sold 6,630 shares of Class A Common Stock at a weighted average price of $26.59 per share on July 7, 2025, pursuant to a Rule 10b5-1 trading plan.

Summary

• Jonathan D. Mariner, a Director of OneStream, Inc., reported a transaction on July 7, 2025.
• He disposed of 6,630 shares of Class A Common Stock.
• The shares were sold at a weighted average price of $26.59 per share, with the sales occurring within a price range of $26.35 to $26.76.
• This transaction was executed under a Rule 10b5-1 trading plan, which was adopted on February 28, 2025.
• Following this transaction, Jonathan D. Mariner beneficially owns 40,280 shares of Class A Common Stock, which includes unvested restricted stock units.

Sentiment

Score: 5

Explanation: The transaction is a routine insider sale executed under a pre-arranged Rule 10b5-1 trading plan, which typically indicates a scheduled liquidity event rather than a change in sentiment based on new information.

Positives

• The transaction was executed under a pre-arranged Rule 10b5-1 trading plan, indicating a scheduled sale rather than a reaction to new, non-public information.

Negatives

• A Director, Jonathan D. Mariner, reduced his direct beneficial ownership in OneStream, Inc. by selling 6,630 shares.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders: The sale slightly reduces direct insider ownership, but its execution under a Rule 10b5-1 plan suggests it is a pre-planned liquidity event rather than a signal of negative company prospects.

Key Dates

Recommendation

Keywords

OneStream, OS, Jonathan Mariner, SEC Form 4, Insider Trading, Stock Sale, Director, Beneficial Ownership, Rule 10b5-1