Eugene Pacelli McCague - 18 Mar 2026 Form 3 Insider Report for ICON PLC (ICLR)

Role: Director
Signature: /s/ Erina Joan Fox, as Attorney-in-Fact
Issuer symbol: ICLR
Transactions as of: 18 Mar 2026
Net transactions value: $0
Form type: 3
Filing time: 18 Mar 2026, 15:29:40 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
McCague Eugene Pacelli	Director	C/O ICON PLC, SOUTH COUNTY BUSINESS PARK, LEOPARDSTOWN, DUBLIN, IRELAND	/s/ Erina Joan Fox, as Attorney-in-Fact	18 Mar 2026	0001973720

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	ICLR	Ordinary Shares						2,920	18 Mar 2026	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	ICLR	Restricted Share Units							18 Mar 2026	Ordinary Shares	1,732		Direct	F1
holding	ICLR	Stock Options							18 Mar 2026	Ordinary Shares	3,255	$125.74	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These restricted share units were granted on May 22, 2025 and vest in full on, where applicable, the later of (i) the first anniversary of the grant date and (ii) the date of payment of withholding taxes. Each restricted share unit represents a contingent right to receive one ordinary share of the Issuer upon vesting, with a nominal conversion price equal to the par value of the ordinary shares (EUR 0.06) per underlying share automatically deducted from the reporting person's pay in connection with vesting.
F2	Fully vested.

Content

These restricted share units were granted on May 22, 2025 and vest in full on, where applicable, the later of (i) the first anniversary of the grant date and (ii) the date of payment of withholding taxes. Each restricted share unit represents a contingent right to receive one ordinary share of the Issuer upon vesting, with a nominal conversion price equal to the par value of the ordinary shares (EUR 0.06) per underlying share automatically deducted from the reporting person's pay in connection with vesting.

Fully vested.

Remarks:

Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the issuer's equity securities are exempt from Sections 16(b) and 16(c) of the Act. Exhibit 24 - Power of Attorney.