ICON PLC ICLR
SHS · Common Stock · CUSIP G4705A100
- SectorHealth care
- IndustryServices-Commercial Physical & Biological Research
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($59.6m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $145.31. Options: 11 managers hold calls ($18.1m notional), 8 hold puts ($8.9m).
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 487 |
| Q4 2022 | 527 |
| Q1 2023 | 536 |
| Q2 2023 | 531 |
| Q3 2023 | 554 |
| Q4 2023 | 601 |
| Q1 2024 | 646 |
| Q2 2024 | 674 |
| Q3 2024 | 661 |
| Q4 2024 | 595 |
| Q1 2025 | 561 |
| Q2 2025 | 490 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 240 | 244 |
| Q4 2023 | 262 | 267 |
| Q1 2024 | 305 | 280 |
| Q2 2024 | 332 | 282 |
| Q3 2024 | 294 | 321 |
| Q4 2024 | 251 | 402 |
| Q1 2025 | 258 | 316 |
| Q2 2025 | 217 | 343 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $82.9m | $20.1m | 0.24 |
| Q4 2024 | $33.1m | $96.4m | 2.91 |
| Q1 2025 | $14.9m | $24.6m | 1.65 |
| Q2 2025 | $18.1m | $8.9m | 0.49 |
Biggest buyers
| Artisan Partners Limited Partnership | Added | +2.9m |
| HARRIS ASSOCIATES L P | New | +1.6m |
| CITADEL ADVISORS LLC | Added | +1.2m |
| 1832 Asset Management L.P. | Added | +984.0k |
| D. E. Shaw & Co., Inc. | Added | +772.3k |
| Balyasny Asset Management L.P. | New | +651.9k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Added | +650.4k |
| UBS Group AG | Added | +599.1k |
| EQUITY INVESTMENT CORP | New | +565.6k |
| MILLENNIUM MANAGEMENT LLC | Added | +502.5k |
Biggest sellers
| WCM INVESTMENT MANAGEMENT, LLC | Reduced | -6.2m |
| Sustainable Growth Advisers, LP | Sold out | -1.5m |
| Clearbridge Investments, LLC | Reduced | -696.4k |
| JANUS HENDERSON GROUP PLC | Reduced | -660.1k |
| CCLA Investment Management | Sold out | -659.9k |
| NEUBERGER BERMAN GROUP LLC | Reduced | -553.4k |
| Boston Partners | Reduced | -548.4k |
| ALLIANCEBERNSTEIN L.P. | Reduced | -540.2k |
| FIL Ltd | Reduced | -539.9k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | -522.6k |
Biggest calls
| CITADEL ADVISORS LLC | Added | $8.3m56.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $6.4m43.8k shares |
| JANE STREET GROUP, LLC | New | $858.2k5.9k shares |
| Cubist Systematic Strategies, LLC | Reduced | $814.5k5.6k shares |
| TUDOR INVESTMENT CORP ET AL | Added | $523.6k3.6k shares |
| WOLVERINE TRADING, LLC | New | $419.2k2.9k shares |
| Walleye Capital LLC | Added | $363.6k2.5k shares |
| Walleye Trading LLC | Added | $276.4k1.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $159.0k1.1k shares |
| GROUP ONE TRADING LLC | Added | $29.1k200 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $3.3m22.7k shares |
| CITADEL ADVISORS LLC | Reduced | $2.6m18.1k shares |
| WOLVERINE TRADING, LLC | New | $852.9k5.9k shares |
| Cubist Systematic Strategies, LLC | Reduced | $843.6k5.8k shares |
| Walleye Capital LLC | Added | $610.9k4.2k shares |
| Walleye Trading LLC | Added | $421.8k2.9k shares |
| JANE STREET GROUP, LLC | Reduced | $261.8k1.8k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Artisan Partners Limited Partnership 13G · institution +1.9 pts · filed 2026-03-06 | 10.9% |
| WELLINGTON MANAGEMENT GROUP LLP 13G · institution +1.7 pts · filed 2026-05-15 | 7.7% |
| Invesco Ltd. 13G · institution +1.8 pts · filed 2026-08-13 | 6.9% |
| FMR LLC 13G · institution +1.4 pts · filed 2026-08-06 | 6.9% |
| HARRIS ASSOCIATES L P 13G · institution new · filed 2026-05-15 | 5.7% |
Fell to 5% or below in the last year: ORBIS INVESTMENT MANAGEMENT LTD (0.0%, 2026-05-15)
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
None reported in Q2 2025.
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| Artisan Partners Limited Partnership 1.56% of their portfolio | 7.2m $1.0bn | Added +2.9m |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.17% of their portfolio | 3.8m $545.7m | Added +650.4k |
| WELLINGTON MANAGEMENT GROUP LLP 0.10% of their portfolio | 3.7m $532.6m | Reduced -31.3k |
| Invesco Ltd. 0.08% of their portfolio | 3.1m $448.9m | Added +98.0k |
| Ninety One UK Ltd 1.02% of their portfolio | 3.0m $435.4m | Added +75.5k |
| D. E. Shaw & Co., Inc. 0.35% of their portfolio | 2.4m $354.0m | Added +772.3k |
| FRANKLIN RESOURCES INC 0.08% of their portfolio | 2.0m $295.9m | Reduced -65.8k |
| FMR LLC 0.02% of their portfolio | 2.0m $285.7m | Added +71.6k |
| CITADEL ADVISORS LLC 0.25% of their portfolio | 1.9m $283.1m | Added +1.2m |
| Ruane, Cunniff & Goldfarb L.P. 4.26% of their portfolio | 1.7m $248.5m | Added +453.8k |
| HARRIS ASSOCIATES L P 0.39% of their portfolio | 1.6m $238.3m | New |
| ALLIANCEBERNSTEIN L.P. 0.06% of their portfolio | 1.3m $192.1m | Reduced -540.2k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.02% of their portfolio | 1.2m $172.7m | Reduced -522.6k |
| 1832 Asset Management L.P. 0.29% of their portfolio | 1.2m $167.5m | Added +984.0k |
| Clearbridge Investments, LLC 0.14% of their portfolio | 1.1m $167.0m | Reduced -696.4k |
| NORGES BANK 0.02% of their portfolio | 1.1m $158.6m | Added +48.1k |
| COMGEST GLOBAL INVESTORS S.A.S. 2.64% of their portfolio | 1.1m $154.9m | Reduced -124.2k |
| Allspring Global Investments Holdings, LLC 0.26% of their portfolio | 1.1m $157.9m | Added +162.9k |
| WGI DM, LLC 7.58% of their portfolio | 1.0m $146.9m | Added +462.6k |
| UBS Group AG 0.03% of their portfolio | 979.2k $142.4m | Added +599.1k |
| First Pacific Advisors, LP 2.01% of their portfolio | 964.1k $140.2m | Added +417.2k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.11% of their portfolio | 851.5k $123.8m | Added +386.6k |
| Trinity Street Asset Management LLP 8.40% of their portfolio | 841.4k $122.4m | Added +7.6k |
| MORGAN STANLEY 0.01% of their portfolio | 813.8k $118.4m | Added +187.6k |
| JANUS HENDERSON GROUP PLC 0.06% of their portfolio | 777.9k $113.2m | Reduced -660.1k |
| Qube Research & Technologies Ltd 0.16% of their portfolio | 774.6k $112.7m | Added +492.0k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 753.0k $109.5m | Reduced -221.2k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.39% of their portfolio | 721.2k $104.9m | Added +375.9k |
| LAZARD ASSET MANAGEMENT LLC 0.14% of their portfolio | 700.9k $101.9m | Reduced -308.1k |
| BAMCO INC /NY/ 0.27% of their portfolio | 690.6k $100.5m | Reduced -13.9k |
| Holocene Advisors, LP 0.24% of their portfolio | 679.7k $98.9m | Added +437.8k |
| Balyasny Asset Management L.P. 0.22% of their portfolio | 651.9k $94.8m | New |
| FIDUCIARY MANAGEMENT INC /WI/ 0.91% of their portfolio | 650.6k $94.6m | Added +217.1k |
| MILLENNIUM MANAGEMENT LLC 0.08% of their portfolio | 617.9k $89.9m | Added +502.5k |
| BANK OF AMERICA CORP /DE/ 0.01% of their portfolio | 614.9k $89.4m | Reduced -257.6k |
| SEI INVESTMENTS CO 0.10% of their portfolio | 606.2k $88.2m | Added +113.1k |
| EARNEST PARTNERS LLC 0.39% of their portfolio | 594.3k $86.4m | Added +18.1k |
| USS Investment Management Ltd 0.52% of their portfolio | 569.6k $82.9m | Unchanged |
| EQUITY INVESTMENT CORP 1.80% of their portfolio | 565.6k $82.3m | New |
| POLEN CAPITAL MANAGEMENT LLC 0.24% of their portfolio | 540.4k $78.6m | Reduced -94.6k |
| Point72 Asset Management, L.P. 0.18% of their portfolio | 535.8k $77.9m | Added +478.8k |
| AMERICAN CENTURY COMPANIES INC 0.04% of their portfolio | 531.4k $77.3m | Added +53.5k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 503.2k $73.2m | Added +92.3k |
| BNP PARIBAS FINANCIAL MARKETS 0.06% of their portfolio | 487.4k $70.9m | Added +290.3k |
| Cantillon Capital Management LLC 0.39% of their portfolio | 465.2k $67.7m | New |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 456.1k $66.3m | Reduced -1.7k |
| Ninety One North America, Inc. 3.06% of their portfolio | 428.9k $62.4m | Added +72.9k |
| STATE STREET CORP 0.00% of their portfolio | 417.6k $60.7m | Added +61.8k |
| Stephens Investment Management Group LLC 0.80% of their portfolio | 414.8k $60.3m | Reduced -14.0k |
| BAUPOST GROUP LLC/MA 1.43% of their portfolio | 405.0k $58.9m | Unchanged |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 390.5k $56.8m | Added +88.4k |
| Fisher Funds Management LTD 1.33% of their portfolio | 386.7k $56.2m | Reduced -130.0k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 373.8k $54.4m | Added +274.8k |
| BROWN BROTHERS HARRIMAN & CO 0.34% of their portfolio | 364.8k $53.1m | Added +99.7k |
| Brandywine Global Investment Management, LLC 0.36% of their portfolio | 354.8k $51.1m | Added +220.4k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.21% of their portfolio | 345.8k $50.3m | Reduced -16.1k |
| Orbis Allan Gray Ltd 0.24% of their portfolio | 335.7k $48.8m | New |
| BlackRock, Inc. 0.00% of their portfolio | 326.6k $47.5m | Added +27.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.06% of their portfolio | 324.8k $47.2m | Added +145.9k |
| Camber Capital Management LP 6.08% of their portfolio | 300.0k $43.6m | New |
| ExodusPoint Capital Management, LP 0.52% of their portfolio | 293.3k $42.7m | New |
| Mawer Investment Management Ltd. 0.20% of their portfolio | 266.0k $38.7m | Reduced -310.1k |
| Legal & General Group Plc 0.01% of their portfolio | 262.0k $38.1m | Reduced -14.0k |
| Diamond Hill Capital Management, LLC (Investment Advisor) 0.17% of their portfolio | 261.6k $38.1m | Reduced -4.3k |
| Iron Triangle Partners LP 5.75% of their portfolio | 250.0k $36.4m | New |
| Coho Partners, Ltd. 2.51% of their portfolio | 231.3k $33.6m | New |
| VANGUARD GROUP INC 0.00% of their portfolio | 225.0k $32.7m | Added +10.2k |
| Employees Retirement System of Texas 0.26% of their portfolio | 219.7k $32.0m | Reduced -3.5k |
| CIBC Private Wealth Group LLC 0.06% of their portfolio | 214.6k $31.2m | Reduced -38.2k |
| River Road Asset Management, LLC 0.45% of their portfolio | 209.1k $35.4m | New |
| NEUBERGER BERMAN GROUP LLC 0.02% of their portfolio | 208.3k $30.3m | Reduced -553.4k |
| BRANDES INVESTMENT PARTNERS, LP 0.27% of their portfolio | 207.5k $30.2m | New |
| Eagle Health Investments LP 7.28% of their portfolio | 202.8k $29.5m | Reduced -6.4k |
| WCM INVESTMENT MANAGEMENT, LLC 0.07% of their portfolio | 199.9k $28.9m | Reduced -6.2m |
| LAKEWOOD CAPITAL MANAGEMENT, LP 2.16% of their portfolio | 195.2k $28.4m | New |
| Canoe Financial LP 0.40% of their portfolio | 193.9k $28.2m | Added +18.2k |
| Hudson Bay Capital Management LP 0.18% of their portfolio | 193.0k $28.1m | New |
| MACQUARIE GROUP LTD 0.03% of their portfolio | 192.0k $27.9m | Added +20.2k |
| MAK CAPITAL ONE LLC 4.72% of their portfolio | 184.1k $26.8m | New |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 179.8k $26.1m | Added +31.3k |
| BROWN CAPITAL MANAGEMENT LLC 0.76% of their portfolio | 179.5k $26.1m | Reduced -2.5k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.02% of their portfolio | 179.4k $26.1m | Added +13.8k |
| Walleye Capital LLC 0.24% of their portfolio | 179.3k $26.1m | Added +146.2k |
| HUDSON EDGE INVESTMENT PARTNERS INC. 4.44% of their portfolio | 178.6k $26.0m | Reduced -3.0k |
| Russell Investments Group, Ltd. 0.03% of their portfolio | 177.2k $25.8m | Added +18.2k |
| Alyeska Investment Group, L.P. 0.09% of their portfolio | 172.5k $25.1m | Reduced -54.6k |
| Jump Financial, LLC 0.30% of their portfolio | 168.7k $24.5m | Added +141.1k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 160.2k $23.3m | Reduced -211.9k |
| Zuckerman Investment Group, LLC 2.23% of their portfolio | 158.2k $23.0m | Added +28.3k |
| TT International Asset Management LTD 0.50% of their portfolio | 158.0k $2.6m | Added +125.8k |
| California Public Employees Retirement System 0.01% of their portfolio | 155.1k $22.6m | Added +7.1k |
| Grandeur Peak Global Advisors, LLC 2.64% of their portfolio | 150.5k $21.9m | Reduced -88.5k |
| Cubist Systematic Strategies, LLC 0.21% of their portfolio | 136.3k $19.8m | Reduced -26.1k |
| TWO SIGMA INVESTMENTS, LP 0.03% of their portfolio | 132.6k $19.3m | New |
| Amundi 0.01% of their portfolio | 124.2k $18.7m | Reduced -7.2k |
| FIL Ltd 0.01% of their portfolio | 119.4k $17.4m | Reduced -539.9k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 110.9k $16.1m | Reduced -74.0k |
| Running Oak Capital LLC 1.73% of their portfolio | 107.2k $15.6m | Added +24.3k |
| HRT FINANCIAL LP 0.08% of their portfolio | 104.1k $15.1m | Added +96.1k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 102.5k $14.9m | Reduced -138.2k |