Schedule 13G/A: Artisan Discloses 7,184,870 ICON Shares (9.0%)

Rhea-AI Filing Summary

Artisan Partners filed Amendment No. 1 to a Schedule 13G reporting a beneficial ownership position in ICON plc Ordinary Shares (CUSIP G4705A100). The filing discloses ownership of 7,184,870 shares, equal to 9.0% of the class based on 79,483,795 shares outstanding as of 06/05/2025. The reporting group reports no sole voting or dispositive power, shared voting power of 6,946,790 and shared dispositive power of 7,184,870.

The statement notes that 5,518,132 of the shares are held on behalf of Artisan Funds and that the shares were acquired on behalf of discretionary clients of Artisan Partners Limited Partnership. The filing certifies the holdings are in the ordinary course of business and not intended to change control and is signed by Gregory K. Ramirez. A joint filing agreement is included as an exhibit.

Positive

• Material disclosure: Reports 7,184,870 shares, representing 9.0% of ICON plc based on 79,483,795 shares outstanding.
• Detailed power breakdown: Filing specifies shared voting power (6,946,790) and shared dispositive power (7,184,870) with no sole powers.
• Client transparency: Identifies that 5,518,132 shares are held on behalf of Artisan Funds and that shares were acquired for discretionary clients.
• Certification and documentation: Filed as Amendment No. 1, signed by Gregory K. Ramirez, and includes a joint filing agreement exhibit.

Negative

• None.

Insights

Financial Analyst

TL;DR: Artisan Partners discloses a material passive stake of 9.0% (7.18M shares) in ICON plc; disclosure is informational, not a control move.

The Schedule 13G/A reports a meaningful institutional holding at 9.0% of ICON plc based on 79,483,795 shares outstanding. The breakdown between shared voting power (6,946,790) and shared dispositive power (7,184,870) indicates collective decision-making authority rather than sole control. The filing specifies that significant shares (5,518,132) are held on behalf of Artisan Funds and that the position is held for discretionary clients, underscoring an investment-management, passive posture. For investors, this is material ownership information but not a governance action.

Corporate Governance Expert

TL;DR: The filing shows institutional influence potential through shared voting power, but the signatories certify the stake is passive and not aimed at changing control.

The document provides clear governance-relevant facts: a 9.0% beneficial ownership stake with no sole voting or dispositive power and a shared voting allocation of 6,946,790. The certification language and use of Schedule 13G (rather than 13D) are consistent with a passive investor disclosure. The inclusion of a joint filing agreement and explicit identification of client-held shares clarifies the reporting structure. This increases transparency about who holds economic and voting rights without indicating any active governance campaign.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

ICON plc

(Name of Issuer)

Ordinary Shares

(Title of Class of Securities)

G4705A100

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G4705A100

1

Names of Reporting Persons

Artisan Partners Asset Management Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,946,790.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,184,870.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,184,870.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.0 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. G4705A100

1

Names of Reporting Persons

Artisan Partners Holdings LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,946,790.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,184,870.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,184,870.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.0 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. G4705A100

1

Names of Reporting Persons

Artisan Investments GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,946,790.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,184,870.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,184,870.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.0 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. G4705A100

1

Names of Reporting Persons

Artisan Partners Limited Partnership

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,946,790.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,184,870.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,184,870.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.0 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: (e) Artisan Partners Limited Partnership is an investment adviser registered under section 203 of the Investment Advisers Act of 1940. (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. G4705A100

1

Names of Reporting Persons

Artisan Partners Funds, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

WISCONSIN

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 5,518,132.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,518,132.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,518,132.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.9 %

12

Type of Reporting Person (See Instructions)

IC

Comment for Type of Reporting Person: (d) Artisan Partners Funds, Inc. is an Investment Company under section 8 of the Investment Company Act.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ICON plc
(b)	Address of issuer's principal executive offices: South County Business Park, Leopardstown, Dublin 18, D18 X5R3, Ireland
Item 2.
(a)	Name of person filing: Artisan Partners Asset Management Inc. ("APAM") Artisan Partners Holdings LP ("Artisan Holdings") Artisan Investments GP LLC ("Artisan Investments") Artisan Partners Limited Partnership ("APLP") Artisan Partners Funds, Inc. ("Artisan Funds")
(b)	Address or principal business office or, if none, residence: APAM, Artisan Holdings, Artisan Investments, APLP, and Artisan Funds are all located at: 875 East Wisconsin Avenue, Suite 800 Milwaukee, WI 53202
(c)	Citizenship: APAM is a Delaware corporation; Artisan Holdings is a Delaware limited partnership; Artisan Investments is a Delaware limited liability company; APLP is a Delaware limited partnership; Artisan Funds is a Wisconsin corporation
(d)	Title of class of securities: Ordinary Shares
(e)	CUSIP No.: G4705A100
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 7,184,870
(b)	Percent of class: 9.0% (based on 79,483,795 shares outstanding as of 06/05/2025)
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: None
	(ii) Shared power to vote or to direct the vote: 6,946,790
	(iii) Sole power to dispose or to direct the disposition of: None
	(iv) Shared power to dispose or to direct the disposition of: 7,184,870
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The shares reported herein have been acquired on behalf of discretionary clients of APLP; as reported herein, APLP holds 7,184,870 shares, including 5,518,132 shares on behalf of Artisan Funds. Persons other than APLP are entitled to receive all dividends from, and proceeds from the sale of, those shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Artisan Partners Asset Management Inc.

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Executive Vice President of Artisan Partners Asset Management Inc.
Date:	08/12/2025

Artisan Partners Holdings LP

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Executive Vice President of Artisan Partners Asset Management Inc., as the general partner of Artisan Partners Holdings LP
Date:	08/12/2025

Artisan Investments GP LLC

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Vice President of Artisan Investments GP LLC
Date:	08/12/2025

Artisan Partners Limited Partnership

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Vice President of Artisan Investments GP LLC, as the general partner of Artisan Partners Limited Partnership
Date:	08/12/2025

Artisan Partners Funds, Inc.

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, President and Chief Executive Officer of Artisan Partners Funds, Inc.
Date:	08/12/2025

Comments accompanying signature: Exhibit Index Exhibit 1 - Joint Filing Agreement dated 08/12/2025 by and among Artisan Partners Asset Management Inc., Artisan Partners Holdings LP, Artisan Investments GP LLC, Artisan Partners Limited Partnership, and Artisan Partners Funds, Inc.

FAQ

What stake does Artisan Partners report in ICON plc (ICLR)?

Artisan Partners reports beneficial ownership of 7,184,870 shares, equal to 9.0% of ICON plc.

When was the Schedule 13G/A signed and what event date is reported?

The filing is signed on 08/12/2025 and lists the date of the event requiring the filing as 06/30/2025.

What voting and dispositive powers are reported by Artisan Partners for ICLR?

The filing reports no sole voting or dispositive power, shared voting power of 6,946,790 and shared dispositive power of 7,184,870.

What shares are held on behalf of other entities or clients?

The filing states that APLP holds shares on behalf of discretionary clients and that 5,518,132 of the reported shares are held on behalf of Artisan Funds.

What outstanding share count was used to calculate the percentage?

Percent of class is calculated using 79,483,795 shares outstanding as of 06/05/2025.