ICON PLC (ICLR) Top Institutional Shareholders
ICON PLC (ICLR) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $8.42B in ICLR holdings during the latest filing period.
Artisan Partners Limited Partnership is currently the largest disclosed institutional shareholder of ICLR tracked by InsiderSet, reporting ownership valued at approximately $916.15M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.19B, representing an estimated gain of +29.47% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 52% of the total disclosed ICLR value among the investors covered in this analysis. Major shareholders include Artisan Partners Limited Partnership, Wellington Management Group Llp, Harris Associates L P, and several other long-term asset managers with concentrated positions in ICON PLC (ICLR).
This page ranks the largest institutional ICLR shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
409
Total Reported Value
$8.42B
Largest Holder
Artisan Partners Limited Partnership
Largest Position
$916.15M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
59
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Artisan Partners Limited Partnership | 1.49% | 8,278,945 | $916,148,054 | $1,186,124,450 | +$269,976,396 | +29.47% | |
| Wellington Management Group Llp | 0.12% | 5,913,037 | $654,336,675 | $847,160,811 | +$192,824,136 | +29.47% | |
| Harris Associates L P | 0.64% | 4,351,317 | $481,516,739 | $623,413,187 | +$141,896,448 | +29.47% | |
| Fmr Llc | 0.02% | 4,174,006 | $461,895,449 | $598,009,840 | +$136,114,391 | +29.47% | |
| Invesco Ltd. | 0.07% | 3,878,869 | $429,235,666 | $555,725,562 | +$126,489,896 | +29.47% | |
| Principal Financial Group Inc | 0.20% | 3,311,771 | $366,480,578 | $474,477,431 | +$107,996,853 | +29.47% | |
| Brave Warrior Advisors | Glenn Greenberg | 8.21% | 2,996,811 | $331,627,105 | $429,353,112 | +$97,726,007 | +29.47% |
| Massachusetts Financial Services Co | 0.10% | 2,727,824 | $304,904,705 | $390,815,344 | +$85,910,639 | +28.18% | |
| Alliancebernstein L.P. | 0.08% | 1,344,595 | $245,012,101 | $192,640,126 | -$52,371,975 | -21.38% | |
| Greenhaven Associates | Edgar Wachenheim III | 3.65% | 2,002,411 | $221,586,801 | $286,885,424 | +$65,298,623 | +29.47% |
| Sequoia Fund | Ruane, Cunniff & Goldfarb | 3.00% | 1,634,611 | $180,886,053 | $234,190,718 | +$53,304,665 | +29.47% |
| Brandes Investment Partners, Lp | 1.12% | 1,435,053 | $158,804,315 | $205,600,043 | +$46,795,728 | +29.47% | |
| Madison Avenue Partners, Lp | 6.17% | 1,282,838 | $141,958,853 | $183,792,200 | +$41,833,347 | +29.47% | |
| Trinity Street Asset Management Llp | 9.17% | 1,208,148 | $133,693,657 | $173,091,364 | +$39,397,707 | +29.47% | |
| D. E. Shaw & Co., Inc. | 0.10% | 1,198,555 | $132,632,096 | $171,716,975 | +$39,084,879 | +29.47% | |
| 1832 Asset Management L.P. | 0.17% | 1,193,240 | $132,043,938 | $170,955,495 | +$38,911,557 | +29.47% | |
| Capital World Investors | 0.02% | 1,104,831 | $122,260,598 | $158,289,137 | +$36,028,539 | +29.47% | |
| Equity Investment Corp | 2.38% | 1,096,395 | $121,327,085 | $157,080,512 | +$35,753,427 | +29.47% | |
| First Pacific Advisors, Lp | 1.54% | 991,075 | $109,672,359 | $141,991,315 | +$32,318,956 | +29.47% | |
| Lyrical Asset Management Lp | 1.58% | 938,204 | $103,821,655 | $134,416,487 | +$30,594,832 | +29.47% | |
| Van Lanschot Kempen Investment Management N.V. | 0.89% | 918,713 | $101,664,781 | $131,624,012 | +$29,959,231 | +29.47% | |
| Earnest Partners Llc | 0.40% | 885,790 | $98,021,521 | $126,907,133 | +$28,885,612 | +29.47% | |
| Holocene Advisors, Lp | 0.23% | 840,845 | $93,047,908 | $120,467,863 | +$27,419,955 | +29.47% | |
| Boston Partners | 0.10% | 835,139 | $92,419,731 | $119,650,365 | +$27,230,634 | +29.46% | |
| Dimensional Fund Advisors Lp | 0.02% | 788,828 | $87,261,794 | $113,015,388 | +$25,753,594 | +29.51% | |
| Franklin Resources Inc | 0.02% | 816,085 | $86,495,975 | $116,920,498 | +$30,424,523 | +35.17% | |
| Sei Investments Co | 0.08% | 757,489 | $83,824,228 | $108,525,449 | +$24,701,221 | +29.47% | |
| Lakewood Capital Management, Lp | 5.31% | 747,700 | $82,740,482 | $107,122,979 | +$24,382,497 | +29.47% | |
| Goldman Sachs Group Inc | 0.01% | 630,621 | $69,784,519 | $90,349,071 | +$20,564,552 | +29.47% | |
| Sound Shore Management | Harry Burn | 2.32% | 626,958 | $69,379,172 | $89,824,273 | +$20,445,101 | +29.47% |
| Ubs Group Ag | 0.01% | 612,265 | $67,753,245 | $87,719,207 | +$19,965,962 | +29.47% | |
| Stephens Investment Management Group Llc | 0.91% | 599,176 | $66,304,816 | $85,843,946 | +$19,539,130 | +29.47% | |
| Bank Of America Corp | 0.00% | 543,487 | $60,142,271 | $77,865,382 | +$17,723,111 | +29.47% | |
| Russell Investments Group, Ltd. | 0.06% | 514,306 | $56,913,173 | $73,684,621 | +$16,771,448 | +29.47% | |
| State Street Corp | 0.00% | 457,209 | $50,594,748 | $65,504,333 | +$14,909,585 | +29.47% | |
| Impactive Capital Lp | 3.62% | 450,540 | $49,856,756 | $64,548,866 | +$14,692,110 | +29.47% | |
| Bamco Inc | 0.14% | 426,805 | $47,230,241 | $61,148,352 | +$13,918,111 | +29.47% | |
| Blackrock, Inc. | 0.00% | 413,596 | $45,768,536 | $59,255,899 | +$13,487,363 | +29.47% | |
| Aberdeen Group Plc | 0.07% | 399,290 | $44,185,432 | $57,206,278 | +$13,020,846 | +29.47% | |
| River Road Asset Management, Llc | 0.46% | 369,715 | $40,912,662 | $52,969,068 | +$12,056,406 | +29.47% | |
| Eagle Health Investments Lp | 8.33% | 358,500 | $39,671,610 | $51,362,295 | +$11,690,685 | +29.47% | |
| New York State Common Retirement Fund | 0.05% | 345,711 | $38,256,379 | $49,530,015 | +$11,273,636 | +29.47% | |
| Maple Rock Capital Partners Inc. | 1.21% | 335,300 | $37,104,298 | $48,038,431 | +$10,934,133 | +29.47% | |
| Hudson Edge Investment Partners Inc. | 5.16% | 319,003 | $35,300,872 | $45,703,560 | +$10,402,688 | +29.47% | |
| Sio Capital Management, Llc | 4.89% | 306,358 | $33,901,576 | $43,891,911 | +$9,990,335 | +29.47% | |
| Morgan Stanley | 0.00% | 293,142 | $32,439,373 | $41,998,454 | +$9,559,081 | +29.47% | |
| Zuckerman Investment Group, Llc | 2.92% | 280,992 | $31,094,575 | $40,257,724 | +$9,163,149 | +29.47% | |
| Raymond James Financial Inc | 0.01% | 261,432 | $28,930,047 | $37,455,363 | +$8,525,316 | +29.47% | |
| Citadel Advisors Llc | 0.02% | 251,607 | $27,842,831 | $36,047,735 | +$8,204,904 | +29.47% | |
| Perry Creek Capital Lp | 16.89% | 245,000 | $27,111,700 | $35,101,150 | +$7,989,450 | +29.47% |
Frequently asked questions about ICLR
Who owns the most ICLR stock?
The largest holders of ICLR are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ICON PLC (ICLR).
Is ICLR widely held by superinvestors?
Many widely followed stocks like ICLR appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ICLR is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.