NASDAQ:ICLR | Historical Stock Price | 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.

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Historical Stock Price — 1999

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1999-12-31$4.25$4.25400
1999-12-30$4.25$4.2512,800
1999-12-29$4.31$4.3135,200
1999-12-28$4.25$4.2518,000
1999-12-27$4.25$4.2537,200
1999-12-23$4.25$4.25118,400
1999-12-22$3.63$3.638,000
1999-12-21$3.50$3.5023,600
1999-12-20$3.75$3.7556,800
1999-12-17$3.61$3.6113,200
1999-12-16$3.69$3.6932,400
1999-12-15$3.66$3.66126,000
1999-12-14$3.38$3.3815,200
1999-12-13$3.25$3.25109,600
1999-12-10$3.50$3.5032,800
1999-12-09$3.50$3.5013,600
1999-12-08$3.50$3.5051,600
1999-12-07$3.88$3.8814,400
1999-12-06$3.75$3.7565,600
1999-12-03$4.02$4.0279,600
1999-12-02$4.28$4.2874,800
1999-12-01$3.97$3.9759,200
1999-11-30$3.47$3.4726,400
1999-11-29$3.88$3.8816,000
1999-11-26$3.94$3.940
1999-11-24$3.94$3.9416,800
1999-11-23$3.97$3.97102,800
1999-11-22$4.25$4.25234,800
1999-11-19$4.28$4.2826,800
1999-11-18$4.22$4.2251,600
1999-11-17$4.00$4.0010,800
1999-11-16$4.08$4.088,800
1999-11-15$4.08$4.0892,800
1999-11-12$4.25$4.25202,400
1999-11-11$4.23$4.2388,400
1999-11-10$3.63$3.63477,200
1999-11-09$3.63$3.6352,800
1999-11-08$3.56$3.562,800
1999-11-05$3.59$3.59539,200
1999-11-04$3.61$3.61135,600
1999-11-03$3.47$3.4765,600
1999-11-02$3.38$3.380
1999-11-01$3.38$3.3866,000
1999-10-29$3.38$3.3829,200
1999-10-28$3.41$3.4133,200
1999-10-27$3.41$3.4119,200
1999-10-26$3.31$3.31513,200
1999-10-25$3.34$3.3425,600
1999-10-22$3.41$3.4126,400
1999-10-21$3.31$3.317,200
1999-10-20$3.33$3.33112,400
1999-10-19$3.31$3.31112,800
1999-10-18$3.38$3.3835,200
1999-10-15$3.38$3.3855,200
1999-10-14$3.25$3.25314,400
1999-10-13$3.09$3.09210,000
1999-10-12$3.53$3.538,400
1999-10-11$3.84$3.84162,400
1999-10-08$3.84$3.841,200
1999-10-07$3.89$3.89503,600
1999-10-06$3.91$3.91278,000
1999-10-05$3.97$3.97325,200
1999-10-04$3.91$3.91162,000
1999-10-01$3.91$3.9130,800
1999-09-30$3.94$3.944,400
1999-09-29$3.81$3.8168,400
1999-09-28$3.88$3.8885,600
1999-09-27$4.00$4.0016,800
1999-09-24$3.88$3.888,400
1999-09-23$3.91$3.9125,200
1999-09-22$4.13$4.13129,600
1999-09-21$4.22$4.2225,200
1999-09-20$4.44$4.4418,400
1999-09-17$4.47$4.4718,000
1999-09-16$4.69$4.6926,800
1999-09-15$4.84$4.8410,000
1999-09-14$4.72$4.7211,200
1999-09-13$4.72$4.72681,200
1999-09-10$4.78$4.78508,800
1999-09-09$4.84$4.84643,200
1999-09-08$4.81$4.8180,800
1999-09-07$5.00$5.0047,200
1999-09-03$4.94$4.942,800
1999-09-02$4.84$4.8424,800
1999-09-01$4.53$4.5321,600
1999-08-31$4.52$4.526,000
1999-08-30$4.56$4.56800
1999-08-27$4.56$4.56210,400
1999-08-26$4.75$4.75124,400
1999-08-25$4.75$4.754,000
1999-08-24$5.03$5.03223,600
1999-08-23$5.00$5.0014,800
1999-08-20$4.69$4.693,200
1999-08-19$4.81$4.8134,400
1999-08-18$5.00$5.00290,000
1999-08-17$5.00$5.00224,800
1999-08-16$5.13$5.1320,000
1999-08-13$5.09$5.093,600
1999-08-12$5.09$5.09147,600
1999-08-11$5.13$5.13388,800
1999-08-10$5.22$5.22218,000
1999-08-09$5.47$5.47250,000
1999-08-06$5.41$5.41186,800
1999-08-05$5.25$5.25462,400
1999-08-04$5.50$5.50178,000
1999-08-03$5.50$5.50114,000
1999-08-02$5.50$5.50105,200
1999-07-30$5.50$5.50159,600
1999-07-29$5.25$5.2585,600
1999-07-28$5.19$5.19156,800
1999-07-27$4.81$4.81313,200
1999-07-26$4.53$4.5324,000
1999-07-23$4.75$4.75118,000
1999-07-22$4.78$4.78400
1999-07-21$4.78$4.7822,800
1999-07-20$4.81$4.8182,800
1999-07-19$4.69$4.6949,200
1999-07-16$4.47$4.4739,200
1999-07-15$4.59$4.59119,200
1999-07-14$4.78$4.78650,800
1999-07-13$4.50$4.5079,600
1999-07-12$4.06$4.06485,600
1999-07-09$4.11$4.11130,000
1999-07-08$4.25$4.2544,800
1999-07-07$4.38$4.3824,400
1999-07-06$4.16$4.16185,600
1999-07-02$4.47$4.4732,000
1999-07-01$4.88$4.8810,000
1999-06-30$4.91$4.9144,400
1999-06-29$5.22$5.2247,200
1999-06-28$5.13$5.13136,800
1999-06-25$5.50$5.5054,400
1999-06-24$5.56$5.56140,400
1999-06-23$4.97$4.9776,400
1999-06-22$4.56$4.5661,600
1999-06-21$4.97$4.97166,000
1999-06-18$4.50$4.50687,200
1999-06-17$3.44$3.4458,000
1999-06-16$3.25$3.2532,400
1999-06-15$3.19$3.1964,800
1999-06-14$3.41$3.4169,600
1999-06-11$3.22$3.224,800
1999-06-10$3.16$3.16183,600
1999-06-09$3.09$3.0916,000
1999-06-08$3.19$3.1942,000
1999-06-07$3.19$3.191,600
1999-06-04$3.19$3.1988,000
1999-06-03$3.19$3.19248,000
1999-06-02$3.27$3.274,000
1999-06-01$3.09$3.0959,200
1999-05-28$3.13$3.1357,200
1999-05-27$3.03$3.03400
1999-05-26$3.31$3.3185,200
1999-05-25$3.00$3.00816,400
1999-05-24$3.38$3.3816,000
1999-05-21$3.34$3.3475,200
1999-05-20$3.45$3.45800
1999-05-19$3.44$3.4420,800
1999-05-18$3.47$3.4727,200
1999-05-17$3.56$3.5613,600
1999-05-14$3.63$3.6388,000
1999-05-13$3.75$3.7588,400
1999-05-12$3.77$3.7799,200
1999-05-11$3.72$3.7234,000
1999-05-10$3.75$3.75141,200
1999-05-07$3.75$3.7514,000
1999-05-06$3.75$3.75150,000
1999-05-05$3.78$3.78122,000
1999-05-04$3.89$3.89163,600
1999-05-03$3.88$3.8822,800
1999-04-30$3.94$3.9444,800
1999-04-29$3.94$3.9437,600
1999-04-28$3.94$3.94460,000
1999-04-27$3.94$3.9475,200
1999-04-26$3.94$3.9440,800
1999-04-23$4.05$4.05120,800
1999-04-22$4.03$4.0345,600
1999-04-21$3.94$3.9422,800
1999-04-20$3.94$3.94180,400
1999-04-19$4.03$4.03136,800
1999-04-16$4.00$4.00349,600
1999-04-15$3.73$3.73123,200
1999-04-14$3.73$3.73160,000
1999-04-13$3.67$3.67530,000
1999-04-12$3.63$3.63227,600
1999-04-09$3.59$3.59307,600
1999-04-08$3.59$3.59154,000
1999-04-07$3.63$3.63345,600
1999-04-06$3.63$3.63621,200
1999-04-05$3.38$3.38545,200
1999-04-01$3.67$3.67880,800
1999-03-31$3.63$3.634,008,000
1999-03-30$3.28$3.2811,344,800
1999-03-29$6.69$6.69380,800
1999-03-26$6.58$6.5835,200
1999-03-25$6.69$6.69162,400
1999-03-24$6.52$6.52420,400
1999-03-23$6.63$6.63171,200
1999-03-22$6.53$6.53209,200
1999-03-19$6.91$6.91475,600
1999-03-18$7.00$7.00259,200
1999-03-17$7.31$7.3144,800
1999-03-16$7.44$7.4488,800
1999-03-15$7.44$7.4452,000
1999-03-12$7.44$7.449,200
1999-03-11$7.47$7.4724,000
1999-03-10$7.69$7.6944,800
1999-03-09$7.47$7.475,600
1999-03-08$7.50$7.5087,600
1999-03-05$7.44$7.4420,000
1999-03-04$7.75$7.7548,000
1999-03-03$6.94$6.944,000
1999-03-02$7.06$7.061,600
1999-03-01$7.00$7.008,400
1999-02-26$7.06$7.0619,600
1999-02-25$6.88$6.8813,600
1999-02-24$7.00$7.0018,800
1999-02-23$7.13$7.1338,800
1999-02-22$6.75$6.750
1999-02-19$6.75$6.75170,000
1999-02-18$6.56$6.568,800
1999-02-17$7.13$7.1316,800
1999-02-16$7.02$7.02201,200
1999-02-12$6.91$6.9137,200
1999-02-11$6.97$6.973,600
1999-02-10$6.97$6.9740,800
1999-02-09$7.13$7.132,400
1999-02-08$7.06$7.064,800
1999-02-05$6.94$6.94302,000
1999-02-04$7.09$7.0965,600
1999-02-03$7.28$7.2885,600
1999-02-02$7.13$7.1397,200
1999-02-01$7.38$7.3828,000
1999-01-29$7.25$7.2561,200
1999-01-28$7.31$7.316,400
1999-01-27$6.97$6.9784,800
1999-01-26$7.19$7.196,800
1999-01-25$7.31$7.3130,800
1999-01-22$7.19$7.1936,800
1999-01-21$7.38$7.38138,000
1999-01-20$7.31$7.31168,000
1999-01-19$6.97$6.97203,600
1999-01-15$7.31$7.31108,400
1999-01-14$7.94$7.94275,600
1999-01-13$7.91$7.9113,600
1999-01-12$7.50$7.5074,000
1999-01-11$8.25$8.25814,400
1999-01-08$7.88$7.88605,200
1999-01-07$8.06$8.06592,800
1999-01-06$8.13$8.13131,600
1999-01-05$8.13$8.1319,600
1999-01-04$8.16$8.16575,200