Atrium Therapeutics (RNA) CMO Steven Hughes Sells 21,459 Shares

What Happened
Steven George Hughes, Chief Medical Officer of Atrium Therapeutics (RNA), had 21,459 shares disposed of on Sept 18, 2026 at $8.95 per share, a total value of $192,058. The transaction is reported as a disposition to satisfy tax withholding obligations tied to vested restricted stock units (RSUs), not an open-market sale.

Key Details

• Transaction date: 2026-09-18
• Price per share: $8.95; Shares involved: 21,459; Total value: $192,058
• Transaction type code: F — shares withheld to satisfy tax withholding on RSU vesting (see footnote F1)
• Shares owned after transaction: not specified in this Form 4 filing
• Filing date / accession: Form filed 2026-09-22 (4 days after the transaction). Form 4s are generally due within 2 business days; this filing appears later than that window unless a weekend/holiday applied.

Context
This was a tax-withholding disposition (often called a cashless or surrender-for-taxes event) tied to RSU vesting. Such withholdings are routine administrative actions and do not necessarily signal insider sentiment about the company. Unlike an open-market sale, the shares were retained by the issuer to cover tax obligations rather than being sold into the market.