Artisan Partners files an amended Schedule 13G reporting beneficial ownership of 8,361,303 Ordinary Shares, equal to 10.9% of the class. The filing states 79,359,932 shares outstanding as of 11/03/2025. It discloses that the shares are held by Artisan Partners Limited Partnership on behalf of discretionary clients, including 6,449,466 shares held for Artisan Partners Funds, Inc.
Positive
None.
Negative
None.
Insights
Artisan Partners reports a 10.9% stake in ICON plc via discretionary accounts.
The filing lists 8,361,303 shares beneficially owned and shows voting/dispositive powers split across related Artisan entities, with 8,131,735 shares of shared voting power and 8,361,303 shared dispositive power.
Holdings are reported as held for discretionary clients of Artisan Partners Limited Partnership, including 6,449,466 shares for Artisan Partners Funds, Inc.; timing and trading intent are not specified in the excerpt.
The amendment clarifies group attribution and inter-entity relationships within Artisan Partners.
The exhibit references a Joint Filing Agreement and provides corporate relationships among Artisan Partners Asset Management Inc., Artisan Holdings, Artisan Investments GP LLC, APLP, and Artisan Funds, supporting the joint reporting of the 8,361,303 shares.
Percent ownership is calculated on a 11/03/2025 outstanding-share base of 79,359,932; the filing preserves customary adviser-client discretionary disclosure rather than specifying voting intentions.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
ICON plc
(Name of Issuer)
Ordinary Shares
(Title of Class of Securities)
02/27/2026
(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 Number(s):
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
8,131,735.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
8,361,303.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
8,361,303.00
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)
10.9 %
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 Number(s):
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
8,131,735.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
8,361,303.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
8,361,303.00
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)
10.9 %
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 Number(s):
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
8,131,735.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
8,361,303.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
8,361,303.00
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)
10.9 %
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 Number(s):
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
8,131,735.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
8,361,303.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
8,361,303.00
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)
10.9 %
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 Number(s):
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
6,449,466.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
6,449,466.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,449,466.00
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)
8.4 %
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:
8,361,303
(b)
Percent of class:
10.9% (based on 79,359,932 shares outstanding as of 11/03/2025)
(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:
8,131,735
(iii) Sole power to dispose or to direct the disposition of:
None
(iv) Shared power to dispose or to direct the disposition of:
8,361,303
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
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 8,361,303 shares, including 6,449,466 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:
03/06/2026
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:
03/06/2026
Artisan Investments GP LLC
Signature:
/s/ Gregory K. Ramirez
Name/Title:
Gregory K. Ramirez, Vice President of Artisan Investments GP LLC
Date:
03/06/2026
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:
03/06/2026
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:
03/06/2026
Exhibit Information
Exhibit Index
Exhibit 1 - Joint Filing Agreement dated 3/6/2026 Artisan Partners Asset Management Inc., Artisan Partners Holdings LP, Artisan Investments GP LLC, Artisan Partners Limited Partnership, and Artisan Partners Funds, Inc.
What stake does Artisan Partners report in ICON plc (ICLR)?
Artisan Partners reports beneficial ownership of 8,361,303 shares, representing 10.9% of ICON plc's Ordinary Shares based on 79,359,932 shares outstanding as of 11/03/2025. The shares are held for discretionary clients.
How much of the holding is held for Artisan Partners Funds, Inc.?
The filing states that 6,449,466 shares are held on behalf of Artisan Partners Funds, Inc. These shares are part of the 8,361,303 total reported as beneficially owned by Artisan Partners Limited Partnership.
What voting and dispositive powers are reported by Artisan Partners?
Artisan reports 8,131,735 shares of shared voting power and 8,361,303 shares of shared dispositive power. No sole voting or sole dispositive powers are listed in the excerpt.
Which Artisan entities jointly filed the Schedule 13G/A amendment?
The joint filing lists Artisan Partners Asset Management Inc., Artisan Partners Holdings LP, Artisan Investments GP LLC, Artisan Partners Limited Partnership, and Artisan Partners Funds, Inc., with a Joint Filing Agreement dated 03/06/2026.
On what basis is the 10.9% ownership percentage calculated?
The 10.9% figure is calculated on a reported share base of 79,359,932 Ordinary Shares outstanding as of 11/03/2025, as stated in the ownership section of the filing.
Does the filing state whether Artisan Partners will trade or vote the shares?
The filing indicates the shares are held on behalf of discretionary clients but does not specify any intended voting direction or planned trading activity. No trading intentions are disclosed in the provided excerpt.
