ICON plc Officer Files Form 144 for Routine Sell-to-Cover Transaction

Executive Summary

On November 2, 2026, Nigel Clerkin, an Officer of ICON plc ($ICLR), filed a Form 144 notice proposing the sale of 1,488 common shares with an estimated aggregate value of approximately $307,501.15 through Morgan Stanley Smith Barney LLC.

Transaction Details

• Securities Proposed for Sale: 1,488 common shares
• Aggregate Market Value: $307,501.15
• Implied Share Price: ~$206.65 per share
• Acquisition Date & Method: Acquired on October 31, 2026, pursuant to restricted stock unit (RSU) vesting under an equity incentive plan.
• Past 3 Months Activity: Mr. Clerkin previously sold 2,267 shares on August 11, 2026, generating gross proceeds of $372,450.64.

Context & Trading Significance

This filing carries Low trading significance:

1. Sell-to-Cover Obligation: Remarks specify that this transaction is mandated by the award agreement to cover tax withholding liabilities arising from the RSU vesting on October 31, 2026. It is not an open-market discretionary sale reflecting insider sentiment.
2. De Minimis Volume: The 1,488 shares represent a fraction of a percent (under 0.002%) of ICON plc's 74,916,724 outstanding common shares, presenting virtually zero market absorption impact.