ICON PLC

Ticker: ICLR CUSIP: G4705A100 Class: SHS

GW&K Investment Management, LLC's Holding History (CIK: 0001082917)

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

Q1 2021

Shares 30,721 Value ($000) $6,033 Avg Close $197.42 Range $168.76 - $223.62

Q4 2020

Shares 31,371 Value ($000) $6,117 Avg Close $195.53 Range $177.52 - $215.29

Q3 2020

Shares 43,207 Value ($000) $8,256 Avg Close $183.83 Range $166.66 - $199.83

Q2 2020

Shares 44,557 Value ($000) $7,506 Avg Close $157.56 Range $127.00 - $173.77

Q1 2020

Shares 42,507 Value ($000) $5,781 Avg Close $160.09 Range $104.28 - $178.99

Q4 2019

Shares 48,467 Value ($000) $8,347 Avg Close $154.22 Range $138.50 - $172.45

Q3 2019

Shares 50,789 Value ($000) $7,483 Avg Close $153.57 Range $145.33 - $165.14

Q2 2019

Shares 52,907 Value ($000) $8,146 Avg Close $140.24 Range $128.52 - $154.40

Q1 2019

Shares 14,431 Value ($000) $1,971 Avg Close $136.30 Range $118.10 - $147.31

Q4 2018

Shares 14,431 Value ($000) $1,865 Avg Close $138.12 Range $119.08 - $155.33

Q3 2018

Shares 14,241 Value ($000) $2,190 Avg Close $143.37 Range $130.22 - $154.10

Q2 2018

Shares 14,241 Value ($000) $1,887 Avg Close $124.66 Range $110.21 - $138.17

Q1 2018

Shares 13,941 Value ($000) $1,647 Avg Close $114.70 Range $101.22 - $124.65

Q4 2017

Shares 11,496 Value ($000) $1,289 Avg Close $115.23 Range $110.54 - $124.48

Q3 2017

Shares 10,796 Value ($000) $1,229 Avg Close $106.27 Range $96.03 - $117.53

Q2 2017

Shares 9,421 Value ($000) $921 Avg Close $88.44 Range $76.46 - $100.87

Q1 2017

Shares 7,300 Value ($000) $582 Avg Close $81.89 Range $74.30 - $88.90

Q4 2016

Shares 6,250 Value ($000) $470 Avg Close $77.66 Range $73.76 - $85.74

Q3 2016

Shares 4,500 Value ($000) $348 Avg Close $75.14 Range $69.05 - $79.61

Q2 2016

Shares 4,050 Value ($000) $284 Avg Close $68.64 Range $62.31 - $77.08

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	30,721	$6,033	$197.42	$168.76 - $223.62
Q4 2020	31,371	$6,117	$195.53	$177.52 - $215.29
Q3 2020	43,207	$8,256	$183.83	$166.66 - $199.83
Q2 2020	44,557	$7,506	$157.56	$127.00 - $173.77
Q1 2020	42,507	$5,781	$160.09	$104.28 - $178.99
Q4 2019	48,467	$8,347	$154.22	$138.50 - $172.45
Q3 2019	50,789	$7,483	$153.57	$145.33 - $165.14
Q2 2019	52,907	$8,146	$140.24	$128.52 - $154.40
Q1 2019	14,431	$1,971	$136.30	$118.10 - $147.31
Q4 2018	14,431	$1,865	$138.12	$119.08 - $155.33
Q3 2018	14,241	$2,190	$143.37	$130.22 - $154.10
Q2 2018	14,241	$1,887	$124.66	$110.21 - $138.17
Q1 2018	13,941	$1,647	$114.70	$101.22 - $124.65
Q4 2017	11,496	$1,289	$115.23	$110.54 - $124.48
Q3 2017	10,796	$1,229	$106.27	$96.03 - $117.53
Q2 2017	9,421	$921	$88.44	$76.46 - $100.87
Q1 2017	7,300	$582	$81.89	$74.30 - $88.90
Q4 2016	6,250	$470	$77.66	$73.76 - $85.74
Q3 2016	4,500	$348	$75.14	$69.05 - $79.61
Q2 2016	4,050	$284	$68.64	$62.31 - $77.08