ICON PLC

Ticker: ICLR CUSIP: G4705A100 Class: SHS

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 2,514 Value ($000) $458 Avg Close $178.08 Range $154.12 - $198.30

Q3 2025

Shares 2,193 Value ($000) $384 Avg Close $167.36 Range $139.15 - $211.00

Q2 2025

Shares 2,264 Value ($000) $329 Avg Close $141.84 Range $125.10 - $175.88

Q1 2025

Shares 2,300 Value ($000) $402 Avg Close $193.87 Range $168.00 - $228.29

Q4 2024

Shares 2,306 Value ($000) $484 Avg Close $233.52 Range $183.38 - $303.69

Q3 2024

Shares 1,259,345 Value ($000) $361,822 Avg Close $315.33 Range $269.08 - $347.72

Q2 2024

Shares 1,158,537 Value ($000) $363,167 Avg Close $313.39 Range $287.02 - $338.98

Q1 2024

Shares 1,147,970 Value ($000) $385,661 Avg Close $294.81 Range $244.59 - $344.77

Q4 2023

Shares 1,144,393 Value ($000) $323,943 Avg Close $258.75 Range $221.20 - $288.50

Q3 2023

Shares 1,043,165 Value ($000) $256,879 Avg Close $252.02 Range $233.81 - $268.07

Q2 2023

Shares 1,059,656 Value ($000) $265,126 Avg Close $212.31 Range $181.92 - $252.15

Q1 2023

Shares 1,347,623 Value ($000) $287,839 Avg Close $222.55 Range $190.73 - $247.47

Q4 2022

Shares 1,484,301 Value ($000) $288,325 Avg Close $198.26 Range $171.43 - $229.84

Q3 2022

Shares 1,516,238 Value ($000) $278,654 Avg Close $217.64 Range $179.95 - $249.62

Q2 2022

Shares 1,520,498 Value ($000) $329,492 Avg Close $224.24 Range $196.34 - $263.62

Q1 2022

Shares 1,111,762 Value ($000) $270,403 Avg Close $250.60 Range $208.13 - $312.28

Q4 2021

Shares 902,807 Value ($000) $279,599 Avg Close $279.80 Range $254.34 - $313.00

Q3 2021

Shares 913,720 Value ($000) $239,413 Avg Close $243.05 Range $205.10 - $301.72

Q2 2021

Shares 633,067 Value ($000) $130,861 Avg Close $215.79 Range $193.25 - $234.22

Q1 2021

Shares 447,815 Value ($000) $87,937 Avg Close $197.42 Range $168.76 - $223.62

Q4 2020

Shares 479,287 Value ($000) $93,451 Avg Close $195.53 Range $177.52 - $215.29

Q3 2020

Shares 509,484 Value ($000) $97,357 Avg Close $183.83 Range $166.66 - $199.83

Q2 2020

Shares 534,495 Value ($000) $90,041 Avg Close $157.56 Range $127.00 - $173.77

Q1 2020

Shares 488,904 Value ($000) $66,491 Avg Close $160.09 Range $104.28 - $178.99

Q4 2019

Shares 500,384 Value ($000) $86,181 Avg Close $154.22 Range $138.50 - $172.45

Q3 2019

Shares 513,609 Value ($000) $75,675 Avg Close $153.57 Range $145.33 - $165.14

Q2 2019

Shares 525,713 Value ($000) $80,944 Avg Close $140.24 Range $128.52 - $154.40

Q1 2019

Shares 555,287 Value ($000) $75,841 Avg Close $136.30 Range $118.10 - $147.31

Q4 2018

Shares 575,983 Value ($000) $74,423 Avg Close $138.12 Range $119.08 - $155.33

Q3 2018

Shares 591,017 Value ($000) $90,869 Avg Close $143.37 Range $130.22 - $154.10

Q2 2018

Shares 598,143 Value ($000) $79,272 Avg Close $124.66 Range $110.21 - $138.17

Q1 2018

Shares 635,444 Value ($000) $75,071 Avg Close $114.70 Range $101.22 - $124.65

Q4 2017

Shares 544,756 Value ($000) $61,094 Avg Close $115.23 Range $110.54 - $124.48

Q3 2017

Shares 556,296 Value ($000) $63,351 Avg Close $106.27 Range $96.03 - $117.53

Q2 2017

Shares 564,946 Value ($000) $55,246 Avg Close $88.44 Range $76.46 - $100.87

Q1 2017

Shares 640,792 Value ($000) $51,084 Avg Close $81.89 Range $74.30 - $88.90

Q4 2016

Shares 1,004,249 Value ($000) $75,520 Avg Close $77.66 Range $73.76 - $85.74

Q3 2016

Shares 1,250,955 Value ($000) $96,786 Avg Close $75.14 Range $69.05 - $79.61

Q2 2016

Shares 1,571,227 Value ($000) $110,002 Avg Close $68.64 Range $62.31 - $77.08

Q1 2016

Shares 1,614,593 Value ($000) $121,256 Avg Close $70.08 Range $64.08 - $77.79

Q4 2015

Shares 1,625,707 Value ($000) $126,317 Avg Close $71.41 Range $63.20 - $78.88

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,514	$458	$178.08	$154.12 - $198.30
Q3 2025	2,193	$384	$167.36	$139.15 - $211.00
Q2 2025	2,264	$329	$141.84	$125.10 - $175.88
Q1 2025	2,300	$402	$193.87	$168.00 - $228.29
Q4 2024	2,306	$484	$233.52	$183.38 - $303.69
Q3 2024	1,259,345	$361,822	$315.33	$269.08 - $347.72
Q2 2024	1,158,537	$363,167	$313.39	$287.02 - $338.98
Q1 2024	1,147,970	$385,661	$294.81	$244.59 - $344.77
Q4 2023	1,144,393	$323,943	$258.75	$221.20 - $288.50
Q3 2023	1,043,165	$256,879	$252.02	$233.81 - $268.07
Q2 2023	1,059,656	$265,126	$212.31	$181.92 - $252.15
Q1 2023	1,347,623	$287,839	$222.55	$190.73 - $247.47
Q4 2022	1,484,301	$288,325	$198.26	$171.43 - $229.84
Q3 2022	1,516,238	$278,654	$217.64	$179.95 - $249.62
Q2 2022	1,520,498	$329,492	$224.24	$196.34 - $263.62
Q1 2022	1,111,762	$270,403	$250.60	$208.13 - $312.28
Q4 2021	902,807	$279,599	$279.80	$254.34 - $313.00
Q3 2021	913,720	$239,413	$243.05	$205.10 - $301.72
Q2 2021	633,067	$130,861	$215.79	$193.25 - $234.22
Q1 2021	447,815	$87,937	$197.42	$168.76 - $223.62
Q4 2020	479,287	$93,451	$195.53	$177.52 - $215.29
Q3 2020	509,484	$97,357	$183.83	$166.66 - $199.83
Q2 2020	534,495	$90,041	$157.56	$127.00 - $173.77
Q1 2020	488,904	$66,491	$160.09	$104.28 - $178.99
Q4 2019	500,384	$86,181	$154.22	$138.50 - $172.45
Q3 2019	513,609	$75,675	$153.57	$145.33 - $165.14
Q2 2019	525,713	$80,944	$140.24	$128.52 - $154.40
Q1 2019	555,287	$75,841	$136.30	$118.10 - $147.31
Q4 2018	575,983	$74,423	$138.12	$119.08 - $155.33
Q3 2018	591,017	$90,869	$143.37	$130.22 - $154.10
Q2 2018	598,143	$79,272	$124.66	$110.21 - $138.17
Q1 2018	635,444	$75,071	$114.70	$101.22 - $124.65
Q4 2017	544,756	$61,094	$115.23	$110.54 - $124.48
Q3 2017	556,296	$63,351	$106.27	$96.03 - $117.53
Q2 2017	564,946	$55,246	$88.44	$76.46 - $100.87
Q1 2017	640,792	$51,084	$81.89	$74.30 - $88.90
Q4 2016	1,004,249	$75,520	$77.66	$73.76 - $85.74
Q3 2016	1,250,955	$96,786	$75.14	$69.05 - $79.61
Q2 2016	1,571,227	$110,002	$68.64	$62.31 - $77.08
Q1 2016	1,614,593	$121,256	$70.08	$64.08 - $77.79
Q4 2015	1,625,707	$126,317	$71.41	$63.20 - $78.88