Odysseas Kostas D 4

What Happened
Odysseas Kostas, a director of Amarin Corporation plc (AMRN), had 838 restricted stock units (RSUs convert/derivative) vest/convert on April 18, 2026 and acquired 838 shares at a $0.00 exercise price. To cover tax withholding related to the vesting, 403 shares were withheld by the issuer at $14.98 per share, generating $6,037 in withholding; this withholding is not an open-market sale.

Key Details

• Transaction date: April 18, 2026; Form 4 filed April 21, 2026 (timely filing).
• Conversion/acquisition: 838 shares reported as acquired at $0.00 (derivative exercise/conversion).
• Tax withholding: 403 shares withheld at $14.98 per share for $6,037 (reported as a disposition via withholding, not a market sale).
• Origin of award: These shares reflect the 2026 vesting installment of 2,514 RSUs granted April 18, 2024 (2,514 ÷ 3 = 838).
• ADS/ratio note: Effective April 11, 2025 the issuer changed the ADS ratio (1 ADS = 20 Ordinary Shares); reported amounts reflect that adjustment.
• Shares owned after transaction: Not specified in the filing.

Context

• The filing code M indicates exercise/conversion of a derivative (here, RSU vesting/conversion); exercise price $0.00 means no cash was paid to acquire the shares.
• The F-code withholding reflects the company retaining shares to cover taxes on vesting (a routine administrative step), which should not be read as a directional market sale by the insider.