Atrium Therapeutics (RNA) CSO Rocio Hoyos Withholds 8,320 Shares for Taxes

What Happened
Rocio Hoyos Martin, Chief Strategy Officer of Atrium Therapeutics, had 8,320 shares withheld by the company on Sept. 18, 2026 to satisfy tax withholding obligations related to the vesting of restricted stock units (RSUs). The shares were valued at $8.95 each, for a total value of $74,464. This transaction is a withholding to cover taxes (disposition), not an open-market sale or a purchase.

Key Details

• Transaction date: 2026-09-18; Form 4 filed: 2026-09-22 (Accession: 0001193125-26-397936).
• Shares withheld/disposed: 8,320 at $8.95 per share; total value ~$74,464.
• Shares owned after transaction: Not disclosed in the provided filing.
• Footnote: F1 — shares were withheld by the issuer to satisfy tax withholding obligations in connection with RSU vesting.
• Filing timeliness: Filing shows a Sep 22 filing for a Sep 18 transaction; no late-filing code was provided in the data you supplied.

Context
Tax-withholding dispositions are routine when RSUs vest; the company withholds and cancels or transfers shares to cover the officer’s tax bill. Because this was a tax withholding (code F), it does not carry the same informational weight as an insider purchase or an intentional open-market sale and should not be interpreted on its own as bullish or bearish. Purchases or deliberate sales generally provide stronger signals about an insider’s view.