NASDAQ:IONS | Historical Stock Price | IONIS PHARMACEUTICALS INC

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
1991-05-17 to 2026-09-04
Data captured

Stock Price Chart

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

$2.77$5.54$11.08$22.15$44.28$88.501991-05-172026-08-27

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

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Historical Stock Price — 2008

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2008-12-31$14.18$14.18791,000
2008-12-30$13.73$13.73612,600
2008-12-29$13.09$13.09444,200
2008-12-26$13.32$13.32236,500
2008-12-24$13.44$13.44187,100
2008-12-23$13.47$13.47515,800
2008-12-22$13.32$13.32623,400
2008-12-19$13.96$13.961,458,600
2008-12-18$13.34$13.34822,200
2008-12-17$12.93$12.931,419,100
2008-12-16$12.09$12.09844,800
2008-12-15$11.00$11.00737,800
2008-12-12$11.60$11.60814,300
2008-12-11$11.33$11.33829,100
2008-12-10$11.80$11.80561,000
2008-12-09$11.83$11.831,186,000
2008-12-08$11.66$11.66773,800
2008-12-05$11.40$11.40784,000
2008-12-04$10.74$10.74985,400
2008-12-03$10.80$10.80808,600
2008-12-02$10.54$10.541,095,300
2008-12-01$10.37$10.37833,900
2008-11-28$11.47$11.47247,100
2008-11-26$11.47$11.47765,500
2008-11-25$11.14$11.14636,400
2008-11-24$10.90$10.901,156,400
2008-11-21$10.70$10.702,159,200
2008-11-20$11.42$11.421,562,000
2008-11-19$12.03$12.031,166,400
2008-11-18$13.21$13.21920,000
2008-11-17$13.77$13.771,012,900
2008-11-14$14.09$14.091,139,300
2008-11-13$15.07$15.071,788,300
2008-11-12$13.60$13.601,463,900
2008-11-11$15.12$15.12892,500
2008-11-10$15.52$15.521,286,900
2008-11-07$14.81$14.811,260,600
2008-11-06$14.46$14.46864,300
2008-11-05$14.48$14.48752,400
2008-11-04$15.23$15.231,361,800
2008-11-03$14.69$14.69696,000
2008-10-31$14.06$14.06919,300
2008-10-30$13.56$13.56841,800
2008-10-29$12.82$12.821,143,500
2008-10-28$13.02$13.021,383,400
2008-10-27$12.25$12.25671,900
2008-10-24$13.16$13.16759,300
2008-10-23$13.63$13.631,290,300
2008-10-22$13.58$13.58766,900
2008-10-21$13.95$13.95776,200
2008-10-20$14.21$14.21705,600
2008-10-17$13.36$13.361,122,300
2008-10-16$13.16$13.161,475,400
2008-10-15$12.72$12.721,320,800
2008-10-14$13.97$13.971,619,500
2008-10-13$13.70$13.701,413,400
2008-10-10$12.23$12.232,439,200
2008-10-09$12.62$12.621,344,500
2008-10-08$13.30$13.301,348,800
2008-10-07$13.63$13.63851,400
2008-10-06$14.43$14.431,786,700
2008-10-03$15.61$15.61605,800
2008-10-02$15.82$15.82522,800
2008-10-01$16.84$16.84524,000
2008-09-30$16.89$16.89761,800
2008-09-29$16.23$16.231,336,500
2008-09-26$17.45$17.451,137,900
2008-09-25$17.20$17.20969,400
2008-09-24$16.74$16.742,277,800
2008-09-23$16.10$16.10593,300
2008-09-22$16.56$16.56546,500
2008-09-19$17.14$17.142,094,900
2008-09-18$16.41$16.411,603,700
2008-09-17$15.41$15.411,833,700
2008-09-16$16.45$16.451,121,300
2008-09-15$16.45$16.45903,900
2008-09-12$17.46$17.46321,300
2008-09-11$17.65$17.65838,900
2008-09-10$17.68$17.68807,300
2008-09-09$17.12$17.12986,800
2008-09-08$17.17$17.17854,200
2008-09-05$17.00$17.00930,300
2008-09-04$17.06$17.061,013,400
2008-09-03$17.99$17.99836,500
2008-09-02$17.69$17.691,188,500
2008-08-29$17.68$17.68456,700
2008-08-28$18.00$18.00541,500
2008-08-27$17.73$17.73794,500
2008-08-26$17.82$17.82710,900
2008-08-25$17.93$17.93415,600
2008-08-22$18.50$18.50661,000
2008-08-21$17.95$17.95712,800
2008-08-20$17.94$17.94976,400
2008-08-19$18.15$18.15773,700
2008-08-18$18.71$18.71963,600
2008-08-15$19.08$19.081,222,900
2008-08-14$19.00$19.001,893,800
2008-08-13$19.01$19.011,209,500
2008-08-12$18.79$18.791,329,300
2008-08-11$18.95$18.953,044,000
2008-08-08$17.78$17.782,954,600
2008-08-07$16.16$16.162,091,200
2008-08-06$17.33$17.33907,400
2008-08-05$17.53$17.531,086,600
2008-08-04$17.43$17.431,474,200
2008-08-01$17.46$17.461,891,500
2008-07-31$17.13$17.131,627,500
2008-07-30$16.29$16.291,150,800
2008-07-29$16.52$16.521,037,300
2008-07-28$16.34$16.34809,200
2008-07-25$16.42$16.421,127,800
2008-07-24$16.34$16.341,349,500
2008-07-23$15.98$15.981,377,900
2008-07-22$16.24$16.242,549,600
2008-07-21$15.32$15.321,444,100
2008-07-18$15.00$15.00756,400
2008-07-17$15.21$15.211,159,800
2008-07-16$14.86$14.861,031,600
2008-07-15$15.00$15.001,833,200
2008-07-14$14.53$14.53824,600
2008-07-11$14.81$14.81964,900
2008-07-10$14.36$14.36831,800
2008-07-09$14.36$14.361,532,400
2008-07-08$14.46$14.461,064,600
2008-07-07$13.88$13.881,005,300
2008-07-03$14.24$14.241,050,000
2008-07-02$13.71$13.711,450,300
2008-07-01$13.88$13.881,743,600
2008-06-30$13.63$13.631,549,200
2008-06-27$13.80$13.801,771,400
2008-06-26$13.76$13.76769,900
2008-06-25$13.95$13.951,203,600
2008-06-24$14.18$14.181,534,600
2008-06-23$14.03$14.03890,700
2008-06-20$14.47$14.471,557,600
2008-06-19$14.76$14.76760,100
2008-06-18$14.34$14.34796,500
2008-06-17$14.50$14.50553,500
2008-06-16$14.80$14.80850,800
2008-06-13$14.89$14.89593,400
2008-06-12$14.39$14.39902,800
2008-06-11$14.56$14.56737,000
2008-06-10$14.97$14.971,588,800
2008-06-09$14.51$14.511,494,200
2008-06-06$15.18$15.181,712,400
2008-06-05$14.87$14.871,440,400
2008-06-04$13.84$13.84805,800
2008-06-03$13.97$13.97936,400
2008-06-02$13.99$13.99831,800
2008-05-30$14.14$14.141,976,700
2008-05-29$14.08$14.081,547,800
2008-05-28$13.64$13.641,419,500
2008-05-27$13.37$13.371,493,900
2008-05-23$12.64$12.64701,100
2008-05-22$12.71$12.71666,000
2008-05-21$12.69$12.69785,900
2008-05-20$12.95$12.95869,000
2008-05-19$12.86$12.861,028,700
2008-05-16$12.89$12.891,417,800
2008-05-15$12.72$12.721,888,900
2008-05-14$12.88$12.882,290,400
2008-05-13$12.86$12.862,155,900
2008-05-12$12.64$12.642,703,900
2008-05-09$11.77$11.772,454,000
2008-05-08$11.26$11.261,718,400
2008-05-07$11.14$11.143,207,800
2008-05-06$11.68$11.682,317,500
2008-05-05$11.75$11.752,173,600
2008-05-02$11.91$11.911,779,600
2008-05-01$12.12$12.121,405,600
2008-04-30$11.78$11.782,457,100
2008-04-29$12.11$12.112,746,400
2008-04-28$12.58$12.583,516,800
2008-04-25$11.99$11.9915,952,300
2008-04-24$16.80$16.80850,500
2008-04-23$16.78$16.78856,500
2008-04-22$16.42$16.42792,200
2008-04-21$16.57$16.571,111,600
2008-04-18$16.89$16.892,127,100
2008-04-17$17.38$17.382,598,100
2008-04-16$16.53$16.531,534,100
2008-04-15$15.98$15.98877,300
2008-04-14$16.22$16.221,115,000
2008-04-11$16.17$16.171,128,200
2008-04-10$16.79$16.792,080,800
2008-04-09$15.89$15.891,250,900
2008-04-08$15.57$15.57679,000
2008-04-07$15.77$15.771,353,500
2008-04-04$15.45$15.451,169,500
2008-04-03$15.21$15.211,325,400
2008-04-02$15.18$15.181,130,000
2008-04-01$15.46$15.462,410,100
2008-03-31$14.11$14.112,036,900
2008-03-28$14.47$14.47842,200
2008-03-27$14.73$14.73655,800
2008-03-26$14.76$14.761,088,300
2008-03-25$15.00$15.00970,800
2008-03-24$14.92$14.922,203,300
2008-03-20$14.62$14.622,491,900
2008-03-19$14.20$14.201,557,800
2008-03-18$14.11$14.111,822,900
2008-03-17$13.37$13.372,193,300
2008-03-14$13.81$13.812,177,500
2008-03-13$14.00$14.002,340,600
2008-03-12$13.78$13.781,735,000
2008-03-11$13.45$13.452,190,900
2008-03-10$13.44$13.442,053,600
2008-03-07$14.49$14.491,589,400
2008-03-06$14.65$14.651,253,700
2008-03-05$15.54$15.541,809,500
2008-03-04$15.27$15.271,676,100
2008-03-03$14.52$14.52895,400
2008-02-29$14.40$14.40913,700
2008-02-28$14.87$14.871,084,200
2008-02-27$15.44$15.441,692,400
2008-02-26$14.80$14.801,579,400
2008-02-25$14.68$14.681,595,900
2008-02-22$13.95$13.951,481,000
2008-02-21$14.08$14.081,280,400
2008-02-20$14.49$14.491,527,400
2008-02-19$15.08$15.081,098,700
2008-02-15$14.97$14.971,068,200
2008-02-14$14.93$14.93982,100
2008-02-13$15.47$15.47901,800
2008-02-12$15.28$15.281,053,500
2008-02-11$15.15$15.151,074,400
2008-02-08$14.84$14.841,522,800
2008-02-07$15.50$15.501,195,000
2008-02-06$15.24$15.24997,700
2008-02-05$15.60$15.601,472,000
2008-02-04$16.02$16.021,259,500
2008-02-01$15.97$15.971,900,500
2008-01-31$15.60$15.602,695,800
2008-01-30$15.14$15.141,213,100
2008-01-29$15.53$15.531,382,300
2008-01-28$15.15$15.151,553,700
2008-01-25$15.19$15.191,024,600
2008-01-24$15.24$15.241,800,100
2008-01-23$15.29$15.292,930,800
2008-01-22$15.57$15.571,896,900
2008-01-18$15.78$15.782,127,800
2008-01-17$16.48$16.482,046,600
2008-01-16$16.41$16.412,444,700
2008-01-15$16.60$16.601,547,400
2008-01-14$16.69$16.692,294,500
2008-01-11$17.10$17.101,748,200
2008-01-10$17.40$17.404,513,700
2008-01-09$16.61$16.617,325,200
2008-01-08$18.58$18.5823,325,500
2008-01-07$14.58$14.588,122,300
2008-01-04$15.02$15.021,483,200
2008-01-03$15.12$15.121,178,300
2008-01-02$15.38$15.381,266,800