NASDAQ:ICLR | Stock Price History | ICON PLC

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
1998-05-15 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$3.03$7.85$20.34$52.72$136.64$354.141998-05-152026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

Historical Stock Price

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2026-09-04$161.0751,800
2026-09-03$159.7640,579
2026-09-02$161.5493,626
2026-09-01$163.6334,910
2026-08-31$170.2544,739
2026-08-28$169.4123,259
2026-08-27$169.72$169.72376,400$169.3225,793
2026-08-26$168.93$168.93414,100$165.4545,565
2026-08-25$168.91$168.91444,900$172.6527,284
2026-08-24$173.48$173.48420,700$171.7135,271
2026-08-21$172.23$172.23391,200$174.6723,936
2026-08-20$174.27$174.27516,300$171.6635,144
2026-08-19$172.49$172.49687,900$169.5381,575
2026-08-18$167.05$167.05556,600$168.5161,665
2026-08-17$169.45$169.45490,000$162.0038,962
2026-08-14$163.15$163.15323,800$166.4024,675
2026-08-13$167.48$167.48442,100$167.9334,573
2026-08-12$167.17$167.17822,300$165.2748,317
2026-08-11$165.58$165.58662,300$164.0254,731
2026-08-10$166.05$166.05516,600$166.0739,710
2026-08-07$164.51$164.51388,400$162.2040,109
2026-08-06$161.17$161.17469,300$161.0049,270
2026-08-05$163.51$163.51617,800$157.9962,618
2026-08-04$156.85$156.851,045,200$156.56127,508
2026-08-03$158.41$158.411,212,100$167.78124,450
2026-07-31$163.57$163.57871,900$168.31123,610
2026-07-30$165.53$165.531,774,100$166.68191,842
2026-07-29$178.18$178.181,572,000$180.25129,679
2026-07-28$180.24$180.241,790,400$177.57125,650
2026-07-27$168.78$168.78778,200$165.0557,313
2026-07-24$165.76$165.76757,700$172.1053,269
2026-07-23$170.32$170.321,282,000$176.97128,482
2026-07-22$167.28$167.28568,100$166.3041,051
2026-07-21$166.62$166.62576,100$163.7359,645
2026-07-20$166.18$166.18703,100$170.7279,261
2026-07-17$170.00$170.00579,600
2026-07-16$170.00$170.00501,800
2026-07-15$172.08$172.08460,300
2026-07-14$167.97$167.97661,100
2026-07-13$166.10$166.10401,600
2026-07-10$167.72$167.72308,500
2026-07-09$168.77$168.77525,300
2026-07-08$165.47$165.47653,800
2026-07-07$168.72$168.72665,500
2026-07-06$170.94$170.94777,200
2026-07-02$173.06$173.06938,200
2026-07-01$175.05$175.05809,200
2026-06-30$173.71$173.711,067,800
2026-06-29$172.99$172.991,359,700
2026-06-26$169.86$169.861,443,200
2026-06-25$160.96$160.962,251,000
2026-06-24$158.17$158.172,406,500
2026-06-23$142.67$142.67696,200
2026-06-22$140.73$140.73918,700
2026-06-18$146.00$146.00870,100
2026-06-17$143.27$143.27989,800
2026-06-16$143.54$143.54568,500
2026-06-15$147.72$147.72598,000
2026-06-12$146.18$146.18703,900
2026-06-11$149.92$149.92790,300
2026-06-10$144.59$144.591,014,500
2026-06-09$151.82$151.821,220,500
2026-06-08$152.24$152.241,129,000
2026-06-05$149.45$149.451,348,900
2026-06-04$152.80$152.801,689,900
2026-06-03$143.90$143.901,380,500
2026-06-02$137.54$137.541,244,100
2026-06-01$138.03$138.031,308,100
2026-05-29$136.07$136.071,581,300
2026-05-28$136.80$136.803,417,900
2026-05-27$118.45$118.451,760,000
2026-05-26$113.85$113.85996,400
2026-05-22$116.78$116.78383,700
2026-05-21$116.57$116.57371,700
2026-05-20$115.09$115.09859,100
2026-05-19$113.55$113.55967,100
2026-05-18$113.78$113.78567,500
2026-05-15$116.38$116.38643,400
2026-05-14$117.09$117.091,184,800
2026-05-13$117.38$117.38641,100
2026-05-12$121.94$121.94803,700
2026-05-11$118.96$118.96824,500
2026-05-08$124.49$124.49681,200
2026-05-07$125.00$125.001,121,600
2026-05-06$124.13$124.131,230,800
2026-05-05$121.32$121.321,594,500
2026-05-04$111.97$111.97781,100
2026-05-01$112.85$112.851,000,900
2026-04-30$118.33$118.331,561,200
2026-04-29$116.17$116.174,097,200
2026-04-28$102.49$102.491,580,300
2026-04-27$103.21$103.213,350,300
2026-04-24$102.17$102.171,802,000
2026-04-23$106.34$106.342,320,400
2026-04-22$115.43$115.431,164,500
2026-04-21$115.18$115.181,023,900
2026-04-20$117.12$117.12995,000
2026-04-17$119.68$119.681,175,700
2026-04-16$115.58$115.581,139,200
2026-04-15$116.50$116.501,356,600