ICON PLC

Ticker: ICLR CUSIP: G4705A100 Class: SHS

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2025

Shares 2,534 Value ($000) $462 Avg Close $178.08 Range $154.12 - $198.30

Q3 2025

Shares 396,354 Value ($000) $69,362 Avg Close $167.36 Range $139.15 - $211.00

Q2 2025

Shares 345,828 Value ($000) $50,301 Avg Close $141.84 Range $125.10 - $175.88

Q1 2025

Shares 361,912 Value ($000) $63,331 Avg Close $193.87 Range $168.00 - $228.29

Q4 2024

Shares 602,999 Value ($000) $126,455 Avg Close $233.52 Range $183.38 - $303.69

Q3 2024

Shares 591,750 Value ($000) $170,016 Avg Close $315.33 Range $269.08 - $347.72

Q2 2024

Shares 527,751 Value ($000) $165,434 Avg Close $313.39 Range $287.02 - $338.98

Q1 2024

Shares 536,883 Value ($000) $180,366 Avg Close $294.81 Range $244.59 - $344.77

Q4 2023

Shares 558,847 Value ($000) $158,193 Avg Close $258.75 Range $221.20 - $288.50

Q3 2023

Shares 556,017 Value ($000) $136,919 Avg Close $252.02 Range $233.81 - $268.07

Q2 2023

Shares 1,377,475 Value ($000) $344,644 Avg Close $212.31 Range $181.92 - $252.15

Q1 2023

Shares 1,365,572 Value ($000) $291,672 Avg Close $222.55 Range $190.73 - $247.47

Q4 2022

Shares 1,391,209 Value ($000) $270,242 Avg Close $198.26 Range $171.43 - $229.84

Q3 2022

Shares 1,400,192 Value ($000) $257,328 Avg Close $217.64 Range $179.95 - $249.62

Q2 2022

Shares 1,374,683 Value ($000) $297,894 Avg Close $224.24 Range $196.34 - $263.62

Q1 2022

Shares 1,321,231 Value ($000) $321,350 Avg Close $250.60 Range $208.13 - $312.28

Q4 2021

Shares 1,254,559 Value ($000) $388,537 Avg Close $279.80 Range $254.34 - $313.00

Q3 2021

Shares 1,284,943 Value ($000) $336,681 Avg Close $243.05 Range $205.10 - $301.72

Q2 2021

Shares 1,306,581 Value ($000) $270,083 Avg Close $215.79 Range $193.25 - $234.22

Q1 2021

Shares 1,502,334 Value ($000) $295,013 Avg Close $197.42 Range $168.76 - $223.62

Q4 2020

Shares 826,956 Value ($000) $161,240 Avg Close $195.53 Range $177.52 - $215.29

Q3 2020

Shares 829,878 Value ($000) $158,581 Avg Close $183.83 Range $166.66 - $199.83

Q2 2020

Shares 828,417 Value ($000) $139,555 Avg Close $157.56 Range $127.00 - $173.77

Q1 2020

Shares 772,782 Value ($000) $105,098 Avg Close $160.09 Range $104.28 - $178.99

Q4 2019

Shares 679,761 Value ($000) $117,075 Avg Close $154.22 Range $138.50 - $172.45

Q3 2019

Shares 657,146 Value ($000) $96,824 Avg Close $153.57 Range $145.33 - $165.14

Q2 2019

Shares 659,490 Value ($000) $101,542 Avg Close $140.24 Range $128.52 - $154.40

Q1 2019

Shares 682,325 Value ($000) $93,192 Avg Close $136.30 Range $118.10 - $147.31

Q4 2018

Shares 698,029 Value ($000) $90,192 Avg Close $138.12 Range $119.08 - $155.33

Q3 2018

Shares 643,879 Value ($000) $98,996 Avg Close $143.37 Range $130.22 - $154.10

Q2 2018

Shares 592,615 Value ($000) $78,539 Avg Close $124.66 Range $110.21 - $138.17

Q1 2018

Shares 535,751 Value ($000) $63,294 Avg Close $114.70 Range $101.22 - $124.65

Q4 2017

Shares 844,053 Value ($000) $94,661 Avg Close $115.23 Range $110.54 - $124.48

Q3 2017

Shares 869,018 Value ($000) $98,964 Avg Close $106.27 Range $96.03 - $117.53

Q2 2017

Shares 774,673 Value ($000) $75,755 Avg Close $88.44 Range $76.46 - $100.87

Q1 2017

Shares 942,754 Value ($000) $75,156 Avg Close $81.89 Range $74.30 - $88.90

Q4 2016

Shares 916,280 Value ($000) $68,904 Avg Close $77.66 Range $73.76 - $85.74

Q3 2016

Shares 1,001,700 Value ($000) $77,502 Avg Close $75.14 Range $69.05 - $79.61

Q2 2016

Shares 1,079,645 Value ($000) $75,586 Avg Close $68.64 Range $62.31 - $77.08

Q1 2016

Shares 1,037,225 Value ($000) $77,896 Avg Close $70.08 Range $64.08 - $77.79

Q4 2015

Shares 1,040,495 Value ($000) $80,846 Avg Close $71.41 Range $63.20 - $78.88

Q3 2015

Shares 1,226,480 Value ($000) $87,043 Avg Close $75.27 Range $64.27 - $84.14

Q2 2015

Shares 1,232,135 Value ($000) $82,923 Avg Close $67.47 Range $62.36 - $71.80

Q1 2015

Shares 1,328,708 Value ($000) $93,714 Avg Close $61.98 Range $50.91 - $72.40

Q4 2014

Shares 1,295,034 Value ($000) $66,034 Avg Close $53.92 Range $49.75 - $59.81

Q3 2014

Shares 1,259,344 Value ($000) $72,072 Avg Close $51.48 Range $45.50 - $57.98

Q2 2014

Shares 1,471,984 Value ($000) $69,345 Avg Close $43.18 Range $35.33 - $49.39

Q1 2014

Shares 1,722,379 Value ($000) $81,899 Avg Close $44.59 Range $38.91 - $50.00

Q4 2013

Shares 1,752,999 Value ($000) $70,849 Avg Close $39.76 Range $36.42 - $44.23

Q3 2013

Shares 1,419,249 Value ($000) $58,090 Avg Close $38.50 Range $35.50 - $41.29

Q2 2013

Shares 1,503,834 Value ($000) $53,281 Avg Close $32.90 Range $29.07 - $36.71

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,534	$462	$178.08	$154.12 - $198.30
Q3 2025	396,354	$69,362	$167.36	$139.15 - $211.00
Q2 2025	345,828	$50,301	$141.84	$125.10 - $175.88
Q1 2025	361,912	$63,331	$193.87	$168.00 - $228.29
Q4 2024	602,999	$126,455	$233.52	$183.38 - $303.69
Q3 2024	591,750	$170,016	$315.33	$269.08 - $347.72
Q2 2024	527,751	$165,434	$313.39	$287.02 - $338.98
Q1 2024	536,883	$180,366	$294.81	$244.59 - $344.77
Q4 2023	558,847	$158,193	$258.75	$221.20 - $288.50
Q3 2023	556,017	$136,919	$252.02	$233.81 - $268.07
Q2 2023	1,377,475	$344,644	$212.31	$181.92 - $252.15
Q1 2023	1,365,572	$291,672	$222.55	$190.73 - $247.47
Q4 2022	1,391,209	$270,242	$198.26	$171.43 - $229.84
Q3 2022	1,400,192	$257,328	$217.64	$179.95 - $249.62
Q2 2022	1,374,683	$297,894	$224.24	$196.34 - $263.62
Q1 2022	1,321,231	$321,350	$250.60	$208.13 - $312.28
Q4 2021	1,254,559	$388,537	$279.80	$254.34 - $313.00
Q3 2021	1,284,943	$336,681	$243.05	$205.10 - $301.72
Q2 2021	1,306,581	$270,083	$215.79	$193.25 - $234.22
Q1 2021	1,502,334	$295,013	$197.42	$168.76 - $223.62
Q4 2020	826,956	$161,240	$195.53	$177.52 - $215.29
Q3 2020	829,878	$158,581	$183.83	$166.66 - $199.83
Q2 2020	828,417	$139,555	$157.56	$127.00 - $173.77
Q1 2020	772,782	$105,098	$160.09	$104.28 - $178.99
Q4 2019	679,761	$117,075	$154.22	$138.50 - $172.45
Q3 2019	657,146	$96,824	$153.57	$145.33 - $165.14
Q2 2019	659,490	$101,542	$140.24	$128.52 - $154.40
Q1 2019	682,325	$93,192	$136.30	$118.10 - $147.31
Q4 2018	698,029	$90,192	$138.12	$119.08 - $155.33
Q3 2018	643,879	$98,996	$143.37	$130.22 - $154.10
Q2 2018	592,615	$78,539	$124.66	$110.21 - $138.17
Q1 2018	535,751	$63,294	$114.70	$101.22 - $124.65
Q4 2017	844,053	$94,661	$115.23	$110.54 - $124.48
Q3 2017	869,018	$98,964	$106.27	$96.03 - $117.53
Q2 2017	774,673	$75,755	$88.44	$76.46 - $100.87
Q1 2017	942,754	$75,156	$81.89	$74.30 - $88.90
Q4 2016	916,280	$68,904	$77.66	$73.76 - $85.74
Q3 2016	1,001,700	$77,502	$75.14	$69.05 - $79.61
Q2 2016	1,079,645	$75,586	$68.64	$62.31 - $77.08
Q1 2016	1,037,225	$77,896	$70.08	$64.08 - $77.79
Q4 2015	1,040,495	$80,846	$71.41	$63.20 - $78.88
Q3 2015	1,226,480	$87,043	$75.27	$64.27 - $84.14
Q2 2015	1,232,135	$82,923	$67.47	$62.36 - $71.80
Q1 2015	1,328,708	$93,714	$61.98	$50.91 - $72.40
Q4 2014	1,295,034	$66,034	$53.92	$49.75 - $59.81
Q3 2014	1,259,344	$72,072	$51.48	$45.50 - $57.98
Q2 2014	1,471,984	$69,345	$43.18	$35.33 - $49.39
Q1 2014	1,722,379	$81,899	$44.59	$38.91 - $50.00
Q4 2013	1,752,999	$70,849	$39.76	$36.42 - $44.23
Q3 2013	1,419,249	$58,090	$38.50	$35.50 - $41.29
Q2 2013	1,503,834	$53,281	$32.90	$29.07 - $36.71