There is a long list of 593 institutional holders of ICLR within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of ICLR by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-ICLR table below, the initial column indicates the name of each top institutional holder of ICLR, with a link to that fund's top holdings. The next columns indicate the amount of ICLR stock held by each of the institutional holders of ICLR, followed by the ICLR position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
WCM Investment Management LLC	6,717,813	$2,256,849	03/31/2024
ICLR	6,717,813	$2,256,849	03/31/2024
Massachusetts Financial Services Co. MA	5,532,676	$1,566,135	12/31/2023
ICLR	5,532,676	$1,566,135	12/31/2023
Wellington Management Group LLP	3,427,415	$970,198	12/31/2023
ICLR	3,427,415	$970,198	12/31/2023
Ninety One UK Ltd	2,645,811	$888,860	03/31/2024
ICLR	2,645,811	$888,860	03/31/2024
FMR LLC	3,025,284	$856,367	12/31/2023
ICLR	3,025,284	$856,367	12/31/2023
Lazard Asset Management LLC	2,761,425	$781,676	12/31/2023
ICLR	2,761,425	$781,676	12/31/2023
Boston Partners	2,671,730	$755,203	12/31/2023
ICLR	2,671,730	$755,203	12/31/2023
Capital Research Global Investors	2,553,673	$722,886	12/31/2023
ICLR	2,553,673	$722,886	12/31/2023
Invesco Ltd.	1,965,902	$556,488	12/31/2023
ICLR	1,965,902	$556,488	12/31/2023
BlackRock Inc.	1,806,591	$511,392	12/31/2023
ICLR	1,806,591	$511,392	12/31/2023
Franklin Resources Inc.	1,684,269	$476,778	12/31/2023
ICLR	1,684,269	$476,778	12/31/2023
Comgest Global Investors S.A.S.	1,543,811	$437,007	12/31/2023
ICLR	1,543,811	$437,007	12/31/2023
Alliancebernstein L.P.	1,536,913	$435,054	12/31/2023
ICLR	1,536,913	$435,054	12/31/2023
Price T Rowe Associates Inc. MD	1,524,880	$431,649	12/31/2023
ICLR	1,524,880	$431,649	12/31/2023
American Century Companies Inc.	1,400,401	$396,412	12/31/2023
ICLR	1,400,401	$396,412	12/31/2023
Clearbridge Investments LLC	1,321,120	$373,969	12/31/2023
ICLR	1,321,120	$373,969	12/31/2023
Sustainable Growth Advisers LP	1,304,448	$369,250	12/31/2023
ICLR	1,304,448	$369,250	12/31/2023
Polen Capital Management LLC	1,191,615	$337,310	12/31/2023
ICLR	1,191,615	$337,310	12/31/2023
William Blair Investment Management LLC	1,144,393	$323,943	12/31/2023
ICLR	1,144,393	$323,943	12/31/2023
State Street Corp	1,048,944	$296,925	12/31/2023
ICLR	1,048,944	$296,925	12/31/2023
Bank of America Corp DE	1,021,662	$289,202	12/31/2023
ICLR	1,021,662	$289,202	12/31/2023
Bamco Inc. NY	987,761	$279,606	12/31/2023
ICLR	987,761	$279,606	12/31/2023
FIL Ltd	986,427	$279,228	12/31/2023
ICLR	986,427	$279,228	12/31/2023
JPMorgan Chase & Co.	964,105	$272,909	12/31/2023
ICLR	964,105	$272,909	12/31/2023
Victory Capital Management Inc.	946,177	$267,834	12/31/2023
ICLR	946,177	$267,834	12/31/2023
BlueSpruce Investments LP	892,390	$252,609	12/31/2023
ICLR	892,390	$252,609	12/31/2023
Trinity Street Asset Management LLP	736,385	$247,389	03/31/2024
ICLR	736,385	$247,389	03/31/2024
Citadel Advisors LLC		$244,000	12/31/2023
ICLR	861,679	$243,915	12/31/2023
Call	8,700	$2,463	12/31/2023
Put	8,400	$2,378	12/31/2023
Neuberger Berman Group LLC	857,752	$242,835	12/31/2023
ICLR	857,752	$242,835	12/31/2023
Janus Henderson Group PLC	843,356	$238,706	12/31/2023
ICLR	843,356	$238,706	12/31/2023
Goldman Sachs Group Inc.	740,186	$209,525	12/31/2023
ICLR	740,186	$209,525	12/31/2023
CIBC Private Wealth Group LLC	695,932	$196,998	12/31/2023
ICLR	695,932	$196,998	12/31/2023
Millennium Management LLC	677,825	$191,872	12/31/2023
ICLR	677,825	$191,872	12/31/2023
Northern Trust Corp	623,158	$176,397	12/31/2023
ICLR	623,158	$176,397	12/31/2023
AustralianSuper Pty Ltd	522,828	$173,438	03/31/2024
ICLR	522,828	$173,438	03/31/2024
Earnest Partners LLC	584,477	$165,448	12/31/2023
ICLR	584,477	$165,448	12/31/2023
Westfield Capital Management Co. LP	558,847	$158,193	12/31/2023
ICLR	558,847	$158,193	12/31/2023
Norges Bank	548,196	$155,178	12/31/2023
ICLR	548,196	$155,178	12/31/2023
Wasatch Advisors Inc.	454,280	$152,615	03/31/2024
ICLR	454,280	$152,615	03/31/2024
American Capital Management Inc.	512,728	$145,138	12/31/2023
ICLR	512,728	$145,138	12/31/2023
CCLA Investment Management Ltd	498,210	$141,073	12/31/2023
ICLR	498,210	$141,073	12/31/2023
Envestnet Asset Management Inc.	480,478	$136,009	12/31/2023
ICLR	480,478	$136,009	12/31/2023
Principal Financial Group Inc.	471,929	$133,589	12/31/2023
ICLR	471,929	$133,589	12/31/2023
Bessemer Group Inc.	458,995	$129,928	12/31/2023
ICLR	458,995	$129,928	12/31/2023
Stephens Investment Management Group LLC	453,068	$128,250	12/31/2023
ICLR	453,068	$128,250	12/31/2023
Morgan Stanley	452,981	$128,226	12/31/2023
ICLR	452,981	$128,226	12/31/2023
Baird Financial Group Inc.	421,401	$119,286	12/31/2023
ICLR	421,401	$119,286	12/31/2023
Geode Capital Management LLC	417,365	$118,144	12/31/2023
ICLR	417,365	$118,144	12/31/2023
Renaissance Technologies LLC	366,758	$103,818	12/31/2023
ICLR	366,758	$103,818	12/31/2023
First Pacific Advisors LP	350,816	$99,305	12/31/2023
ICLR	350,816	$99,305	12/31/2023