Atrium (RNA) Director Flanagan W. Michael Sells 22,812 Shares

What Happened
Flanagan W. Michael, a director of Atrium Therapeutics, disposed of 22,812 shares on 2026-09-18 as part of a tax-withholding transaction tied to the vesting of restricted stock units (RSUs). The filing reports the shares were valued at $8.95 each for a total of $204,167. This was a tax-withholding disposition (code F), not an open-market sale.

Key Details

• Transaction date: 2026-09-18; Filing date: 2026-09-22 (filed within the standard two-business-day window).
• Reported disposition: 22,812 shares at $8.95 per share, total ~$204,167.
• Transaction code: F — shares withheld by the issuer to satisfy tax withholding on RSU vesting (see footnote F1).
• Shares owned after transaction: Not specified in the provided summary of the Form 4.
• Footnote: F1 — issuer withheld shares to satisfy tax withholding obligations in connection with RSU vesting.

Context
Tax-withholding share dispositions are routine when equity awards vest; the company retains (withholds) shares to cover the employee’s or insider’s tax liability. These transactions typically do not indicate a decision to diversify or a market-view change by the insider the way an open-market sale might.