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 ($8.7m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $172.70. Options: 17 managers hold calls ($135.2m notional), 15 hold puts ($85.5m).
Trends to Q2 2026
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 |
| Q3 2025 | 513 |
| Q4 2025 | 514 |
| Q1 2026 | 419 |
| Q2 2026 | 424 |
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 2024 | 294 | 321 |
| Q4 2024 | 251 | 402 |
| Q1 2025 | 258 | 316 |
| Q2 2025 | 217 | 343 |
| Q3 2025 | 256 | 244 |
| Q4 2025 | 217 | 266 |
| Q1 2026 | 216 | 285 |
| Q2 2026 | 227 | 217 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $23.0m | $19.1m | 0.83 |
| Q4 2025 | $46.7m | $18.5m | 0.40 |
| Q1 2026 | $40.0m | $26.5m | 0.66 |
| Q2 2026 | $135.2m | $85.5m | 0.63 |
Biggest buyers
| Invesco Ltd. | Added | +1.4m |
| GREENHAVEN ASSOCIATES INC | Added | +1.1m |
| FMR LLC | Added | +1.1m |
| AMERIPRISE FINANCIAL INC | Added | +877.4k |
| Maple Rock Capital Partners Inc. | Added | +864.3k |
| Boston Partners | Added | +785.6k |
| DIMENSIONAL FUND ADVISORS LP | Added | +481.4k |
| Ruane, Cunniff & Goldfarb L.P. | Added | +413.5k |
| JANE STREET GROUP, LLC | Added | +372.4k |
| Zurich Insurance Group Ltd/FI | Added | +371.3k |
Biggest sellers
| Sachem Head Capital Management LP | Sold out | -2.1m |
| Madison Avenue Partners, LP | Sold out | -1.3m |
| Holocene Advisors, LP | Sold out | -840.8k |
| Sound Shore Management Inc /CT/ | Sold out | -627.0k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | -622.7k |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | -593.0k |
| Impactive Capital LP | Sold out | -450.5k |
| First Pacific Advisors, LP | Reduced | -384.6k |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | -360.8k |
| BRANDES INVESTMENT PARTNERS, LP | Reduced | -249.3k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $34.0m196.0k shares |
| JANE STREET GROUP, LLC | Added | $21.6m124.6k shares |
| CITADEL ADVISORS LLC | Added | $14.4m82.9k shares |
| Arvin Capital Management LP | New | $12.2m70.0k shares |
| Caption Management, LLC | New | $11.2m64.4k shares |
| Walleye Trading LLC | Added | $10.9m62.6k shares |
| IMC-Chicago, LLC | Added | $9.7m55.6k shares |
| MILLENNIUM MANAGEMENT LLC | Added | $7.0m40.2k shares |
| GROUP ONE TRADING LLC | Added | $5.2m29.7k shares |
| Squarepoint Ops LLC | Added | $2.7m15.4k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $29.1m167.6k shares |
| Oribel Capital Management, LP | New | $17.0m98.1k shares |
| CITADEL ADVISORS LLC | Added | $10.1m58.1k shares |
| Caption Management, LLC | New | $6.7m38.7k shares |
| JANE STREET GROUP, LLC | Added | $5.9m34.0k shares |
| IMC-Chicago, LLC | Added | $4.6m26.2k shares |
| D. E. Shaw & Co., Inc. | Unchanged | $4.1m23.7k shares |
| GROUP ONE TRADING LLC | Added | $2.5m14.6k shares |
| BOOTHBAY FUND MANAGEMENT, LLC | New | $1.8m10.1k shares |
| Walleye Trading LLC | Added | $1.5m8.9k 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 since 1 Apr 2026
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.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 9 | $3.6m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-17 | Murphy Ronan Martin Director | Sold | $875.9k5.0k shares |
| 2026-09-17 | McCague Eugene Pacelli Director | Sold | $569.6k3.3k shares |
| 2026-09-16 | CLIMAX JOHN DR Director | Sold | $875.9k5.0k shares |
| 2026-08-11 | Murray Ciaran Director | Sold | $439.8k2.7k shares |
| 2026-08-11 | Clerkin Nigel Bernard John Chief Financial Officer | Sold | $372.4k2.3k shares |
| 2026-08-11 | O'Neill Julie Director | Sold | $150.3k915 shares |
| 2026-08-11 | Grais Linda Director | Sold | $138.2k841 shares |
| 2026-08-11 | CLIMAX JOHN DR Director | Sold | $138.2k841 shares |
| 2026-08-11 | McCague Eugene Pacelli Director | Sold | $138.2k841 shares |
| 2026-08-11 | Murphy Ronan Martin Director | Sold | $138.2k841 shares |
| 2026-08-11 | Whitaker Anne Clem Director | Sold | $138.2k841 shares |
| 2026-08-10 | Balfe Barry Edward Chief Executive Officer, director | Sold | $62.7k382 shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Artisan Partners Limited Partnership 2.45% of their portfolio | 8.6m $1.5bn | Added +357.5k |
| WELLINGTON MANAGEMENT GROUP LLP 0.16% of their portfolio | 5.3m $924.1m | Reduced -593.0k |
| FMR LLC 0.04% of their portfolio | 5.3m $915.7m | Added +1.1m |
| Invesco Ltd. 0.07% of their portfolio | 5.3m $914.5m | Added +1.4m |
| HARRIS ASSOCIATES L P 1.03% of their portfolio | 4.5m $776.2m | Added +116.8k |
| Brave Warrior Advisors, LLC 11.94% of their portfolio | 3.2m $547.8m | Added +156.5k |
| GREENHAVEN ASSOCIATES INC 6.22% of their portfolio | 3.1m $538.6m | Added +1.1m |
| PRINCIPAL FINANCIAL GROUP INC 0.25% of their portfolio | 3.0m $512.6m | Reduced -360.8k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.12% of their portfolio | 2.1m $369.4m | Reduced -622.7k |
| Ruane, Cunniff & Goldfarb L.P. 5.54% of their portfolio | 2.0m $355.8m | Added +413.5k |
| Boston Partners 0.25% of their portfolio | 1.6m $281.4m | Added +785.6k |
| Trinity Street Asset Management LLP 13.74% of their portfolio | 1.5m $266.7m | Added +327.3k |
| ALLIANCEBERNSTEIN L.P. 0.05% of their portfolio | 1.4m $152.5m | Added +33.6k |
| D. E. Shaw & Co., Inc. 0.15% of their portfolio | 1.4m $235.7m | Added +158.6k |
| DIMENSIONAL FUND ADVISORS LP 0.04% of their portfolio | 1.3m $220.6m | Added +481.4k |
| EARNEST PARTNERS LLC 0.78% of their portfolio | 1.2m $215.9m | Added +356.8k |
| Maple Rock Capital Partners Inc. 4.09% of their portfolio | 1.2m $208.4m | Added +864.3k |
| 1832 Asset Management L.P. 0.25% of their portfolio | 1.2m $207.6m | Added +1.6k |
| BRANDES INVESTMENT PARTNERS, LP 1.44% of their portfolio | 1.2m $206.0m | Reduced -249.3k |
| Capital World Investors 0.02% of their portfolio | 1.1m $192.1m | Added +1.2k |
| AMERIPRISE FINANCIAL INC 0.03% of their portfolio | 979.6k $170.2m | Added +877.4k |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. 1.28% of their portfolio | 961.7k $167.1m | Added +43.0k |
| SEI INVESTMENTS CO 0.14% of their portfolio | 902.2k $156.7m | Added +144.7k |
| EQUITY INVESTMENT CORP 2.95% of their portfolio | 888.9k $154.4m | Reduced -207.5k |
| LYRICAL ASSET MANAGEMENT LP 1.94% of their portfolio | 881.2k $153.1m | Reduced -57.0k |
| NORGES BANK 0.01% of their portfolio | 821.0k $142.6m | Not comparable |
| Thrivent Financial for Lutherans 0.23% of their portfolio | 802.4k $139.4m | Added +180.0k |
| FRANKLIN RESOURCES INC 0.03% of their portfolio | 771.1k $136.2m | Reduced -45.0k |
| Stephens Investment Management Group LLC 1.34% of their portfolio | 720.3k $125.1m | Added +121.1k |
| First Pacific Advisors, LP 1.30% of their portfolio | 606.5k $105.4m | Reduced -384.6k |
| Russell Investments Group, Ltd. 0.09% of their portfolio | 599.2k $104.1m | Added +84.9k |
| LAKEWOOD CAPITAL MANAGEMENT, LP 5.27% of their portfolio | 585.2k $101.7m | Reduced -162.5k |
| UBS Group AG 0.02% of their portfolio | 546.4k $94.9m | Reduced -65.8k |
| BlackRock, Inc. 0.00% of their portfolio | 534.9k $92.9m | Added +121.3k |
| BANK OF AMERICA CORP /DE/ 0.01% of their portfolio | 503.1k $87.4m | Reduced -40.4k |
| Zurich Insurance Group Ltd/FI 0.58% of their portfolio | 481.2k $83.6m | Added +371.3k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 450.7k $78.3m | Reduced -179.9k |
| STATE STREET CORP 0.00% of their portfolio | 437.9k $76.1m | Reduced -19.4k |
| MORGAN STANLEY 0.00% of their portfolio | 414.2k $71.9m | Added +121.0k |
| Aberdeen Group plc 0.10% of their portfolio | 394.4k $68.5m | Reduced -4.9k |
| BAMCO INC /NY/ 0.10% of their portfolio | 376.8k $65.5m | Reduced -50.0k |
| JANE STREET GROUP, LLC 0.04% of their portfolio | 374.8k $65.1m | Added +372.4k |
| HUDSON EDGE INVESTMENT PARTNERS INC. 8.70% of their portfolio | 366.5k $63.7m | Added +47.5k |
| Point72 Asset Management, L.P. 0.10% of their portfolio | 365.9k $63.6m | Added +356.1k |
| Woodline Partners LP 0.18% of their portfolio | 327.2k $56.8m | New |
| Eagle Health Investments LP 8.87% of their portfolio | 308.1k $53.5m | Reduced -50.4k |
| Zuckerman Investment Group, LLC 4.33% of their portfolio | 294.4k $51.1m | Added +13.4k |
| VOYA INVESTMENT MANAGEMENT LLC 0.04% of their portfolio | 289.9k $50.4m | New |
| River Road Asset Management, LLC 0.55% of their portfolio | 285.1k $49.5m | Reduced -84.6k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.02% of their portfolio | 246.0k $42.7m | Added +143.3k |
| PERRY CREEK CAPITAL LP 19.48% of their portfolio | 245.0k $42.6m | Unchanged |
| CIBC Bancorp USA Inc. 0.05% of their portfolio | 231.2k $40.2m | Added +2.3k |
| Legal & General Group Plc 0.01% of their portfolio | 229.8k $39.9m | Added +54.4k |
| Hyperion Capital Advisors LP 17.60% of their portfolio | 224.7k $39.0m | Added +82.2k |
| BROWN ADVISORY INC 0.05% of their portfolio | 202.3k $35.1m | Added +29.0k |
| Diamond Hill Capital Management, LLC (Investment Advisor) 0.27% of their portfolio | 194.6k $33.8m | Reduced -25.7k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 194.0k $33.7m | Added +40.3k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 192.0k $33.3m | Reduced -69.5k |
| KENSICO CAPITAL MANAGEMENT CORP 0.56% of their portfolio | 188.0k $32.7m | New |
| MARSHALL WACE, LLP 0.03% of their portfolio | 175.4k $30.5m | Added +161.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 154.0k $26.7m | New |
| Fisher Funds Management LTD 0.74% of their portfolio | 149.7k $26.0m | Reduced -24.6k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 148.6k $25.8m | Reduced -103.0k |
| Stanley Capital Management, LLC 3.23% of their portfolio | 140.2k $24.3m | Added +40.2k |
| PFM Health Sciences, LP 2.06% of their portfolio | 136.5k $23.7m | Added +79.0k |
| Parkwood LLC 1.68% of their portfolio | 134.8k $23.4m | New |
| Eldred Rock Partners, LLC 5.01% of their portfolio | 134.2k $23.3m | Reduced -221 |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 133.8k $23.2m | Reduced -11.4k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.03% of their portfolio | 122.9k $21.4m | Reduced -222.8k |
| Foresight Group Ltd Liability Partnership 3.71% of their portfolio | 119.2k $20.6m | Added +38.5k |
| Polar Capital Holdings Plc 0.06% of their portfolio | 116.9k $20.3m | Added +16.5k |
| Corient Private Wealth LP 0.03% of their portfolio | 114.8k $19.9m | Reduced -465 |
| Vident Advisory, LLC 0.15% of their portfolio | 114.3k $19.9m | Added +5.2k |
| California Public Employees Retirement System 0.01% of their portfolio | 113.4k $19.7m | Reduced -6.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 106.3k $18.5m | Added +18.9k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.17% of their portfolio | 104.3k $18.1m | Reduced -4.1k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 98.6k $17.1m | Added +2.8k |
| Oribel Capital Management, LP 1.42% of their portfolio | 98.1k $17.0m | New |
| BANK OF MONTREAL /CAN/ 0.01% of their portfolio | 97.6k $17.0m | Added +1.2k |
| TEACHER RETIREMENT SYSTEM OF TEXAS 0.05% of their portfolio | 97.1k $16.9m | New |
| Sio Capital Management, LLC 2.63% of their portfolio | 88.2k $15.3m | Reduced -218.2k |
| Distillate Capital Partners LLC 0.78% of their portfolio | 86.7k $15.1m | Reduced -67.1k |
| STATE OF MICHIGAN RETIREMENT SYSTEM 0.07% of their portfolio | 85.1k $14.8m | Unchanged |
| Sone Capital Management, LLC 1.10% of their portfolio | 83.3k $14.5m | New |
| FARMERS & MERCHANTS INVESTMENTS INC 0.35% of their portfolio | 82.9k $14.4m | Reduced -93 |
| PARTHENON LLC 1.42% of their portfolio | 78.7k $13.7m | Reduced -550 |
| Leith Wheeler Investment Counsel Ltd. 1.00% of their portfolio | 75.8k $13.2m | Reduced -5.6k |
| Handelsbanken Fonder AB 0.04% of their portfolio | 71.8k $12.5m | Added +59.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 69.7k $12.1m | Reduced -3.7k |
| FIRETRAIL INVESTMENTS PTY LTD 3.39% of their portfolio | 69.6k $12.0m | Added +12.0k |
| MUHLENKAMP & CO INC 3.34% of their portfolio | 66.3k $11.5m | Added +332 |
| Arvin Capital Management LP 2.11% of their portfolio | 64.8k $11.3m | New |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 62.8k $10.9m | Added +4.2k |
| Khrom Capital Management LLC 0.90% of their portfolio | 61.9k $10.8m | New |
| Schonfeld Strategic Advisors LLC 0.05% of their portfolio | 54.6k $9.5m | Added +4.9k |
| Verition Fund Management LLC 0.07% of their portfolio | 53.6k $9.3m | Added +11.3k |
| GATEWAY INVESTMENT ADVISERS LLC 0.09% of their portfolio | 53.6k $9.3m | Reduced -4.3k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.01% of their portfolio | 52.4k $9.1m | Added +830 |
| OSBORNE PARTNERS CAPITAL MANAGEMENT, LLC 0.47% of their portfolio | 48.7k $8.5m | Reduced -1.1k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 48.5k $8.4m | Reduced -2.3k |