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 — 2012

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2012-12-31$10.44$10.441,185,400
2012-12-28$10.10$10.10703,500
2012-12-27$10.28$10.281,027,100
2012-12-26$10.12$10.12771,200
2012-12-24$10.11$10.11519,400
2012-12-21$10.27$10.272,636,000
2012-12-20$10.27$10.271,500,200
2012-12-19$10.26$10.261,692,200
2012-12-18$10.06$10.061,867,500
2012-12-17$10.04$10.041,803,000
2012-12-14$9.98$9.985,872,400
2012-12-13$9.61$9.611,347,900
2012-12-12$9.57$9.57622,500
2012-12-11$9.55$9.551,761,000
2012-12-10$9.42$9.421,437,000
2012-12-07$8.99$8.99460,400
2012-12-06$9.00$9.00660,200
2012-12-05$9.04$9.04764,800
2012-12-04$9.01$9.01931,400
2012-12-03$9.23$9.23724,000
2012-11-30$9.20$9.20790,600
2012-11-29$9.22$9.22675,500
2012-11-28$9.07$9.07538,900
2012-11-27$9.01$9.01659,300
2012-11-26$9.00$9.00708,700
2012-11-23$9.06$9.06522,500
2012-11-21$8.78$8.78858,300
2012-11-20$8.94$8.941,445,800
2012-11-19$8.88$8.881,427,300
2012-11-16$8.41$8.411,442,300
2012-11-15$8.08$8.08839,900
2012-11-14$8.18$8.181,481,000
2012-11-13$8.64$8.641,004,300
2012-11-12$8.56$8.561,324,200
2012-11-09$8.78$8.784,073,800
2012-11-08$7.67$7.671,849,300
2012-11-07$8.11$8.111,716,600
2012-11-06$8.09$8.092,966,900
2012-11-05$8.72$8.721,125,100
2012-11-02$8.54$8.541,500,200
2012-11-01$8.92$8.921,435,000
2012-10-31$8.64$8.641,175,800
2012-10-26$8.90$8.901,253,000
2012-10-25$8.90$8.901,555,200
2012-10-24$9.05$9.051,823,700
2012-10-23$9.31$9.312,926,100
2012-10-22$9.16$9.162,922,700
2012-10-19$9.35$9.359,860,200
2012-10-18$9.62$9.620
2012-10-17$9.62$9.627,350,700
2012-10-16$10.27$10.2717,508,800
2012-10-15$13.15$13.154,320,900
2012-10-12$12.64$12.641,418,800
2012-10-11$12.50$12.50891,100
2012-10-10$12.44$12.44932,400
2012-10-09$12.46$12.461,061,000
2012-10-08$12.26$12.261,171,300
2012-10-05$12.49$12.491,062,300
2012-10-04$12.60$12.602,239,600
2012-10-03$12.82$12.823,152,300
2012-10-02$13.21$13.211,540,800
2012-10-01$13.77$13.77803,300
2012-09-28$14.07$14.07486,900
2012-09-27$14.38$14.38905,200
2012-09-26$14.04$14.04824,500
2012-09-25$14.86$14.861,077,100
2012-09-24$14.32$14.321,045,400
2012-09-21$14.37$14.373,631,400
2012-09-20$15.41$15.411,390,500
2012-09-19$14.86$14.86975,000
2012-09-18$14.59$14.59645,200
2012-09-17$14.46$14.46618,800
2012-09-14$14.63$14.631,180,600
2012-09-13$14.50$14.501,020,300
2012-09-12$14.61$14.61598,400
2012-09-11$14.56$14.56885,700
2012-09-10$14.61$14.61882,100
2012-09-07$14.85$14.851,299,600
2012-09-06$15.27$15.271,391,700
2012-09-05$14.79$14.792,198,300
2012-09-04$15.09$15.093,347,300
2012-08-31$13.61$13.61846,100
2012-08-30$13.62$13.62648,400
2012-08-29$13.87$13.87622,000
2012-08-28$13.81$13.81430,400
2012-08-27$13.81$13.81465,600
2012-08-24$13.62$13.62438,200
2012-08-23$13.68$13.68683,800
2012-08-22$13.60$13.60559,800
2012-08-21$13.63$13.63722,100
2012-08-20$13.53$13.53852,300
2012-08-17$13.40$13.40831,400
2012-08-16$13.55$13.55795,600
2012-08-15$13.39$13.39902,100
2012-08-14$13.35$13.351,546,100
2012-08-13$13.09$13.09985,400
2012-08-10$12.71$12.711,511,100
2012-08-09$12.87$12.871,080,400
2012-08-08$12.60$12.603,509,900
2012-08-07$12.55$12.556,312,900
2012-08-06$13.19$13.191,613,500
2012-08-03$12.08$12.08663,200
2012-08-02$11.72$11.72944,300
2012-08-01$11.80$11.80888,300
2012-07-31$12.12$12.12796,200
2012-07-30$12.54$12.541,137,600
2012-07-27$13.04$13.04716,700
2012-07-26$12.75$12.75697,600
2012-07-25$12.48$12.48671,700
2012-07-24$12.30$12.30883,000
2012-07-23$12.58$12.58981,500
2012-07-20$12.97$12.97686,100
2012-07-19$12.96$12.961,526,800
2012-07-18$14.03$14.03894,500
2012-07-17$13.74$13.74606,800
2012-07-16$13.51$13.51584,800
2012-07-13$13.41$13.41699,200
2012-07-12$13.19$13.191,334,200
2012-07-11$12.63$12.631,995,800
2012-07-10$13.56$13.561,907,000
2012-07-09$13.99$13.991,935,900
2012-07-06$13.17$13.17766,000
2012-07-05$12.97$12.97784,400
2012-07-03$12.92$12.92724,300
2012-07-02$12.94$12.941,664,300
2012-06-29$12.00$12.001,269,200
2012-06-28$11.64$11.64944,200
2012-06-27$11.80$11.80809,200
2012-06-26$11.59$11.59717,700
2012-06-25$11.61$11.61692,600
2012-06-22$11.89$11.891,422,100
2012-06-21$10.87$10.87515,700
2012-06-20$11.03$11.03457,500
2012-06-19$11.02$11.02592,000
2012-06-18$10.99$10.99561,300
2012-06-15$10.87$10.871,029,600
2012-06-14$10.94$10.941,165,000
2012-06-13$10.21$10.21602,400
2012-06-12$10.28$10.28512,900
2012-06-11$10.18$10.18502,200
2012-06-08$10.46$10.46803,400
2012-06-07$9.99$9.99555,500
2012-06-06$10.19$10.19511,100
2012-06-05$10.10$10.10395,600
2012-06-04$9.95$9.95510,500
2012-06-01$9.72$9.72901,000
2012-05-31$9.89$9.89911,300
2012-05-30$10.04$10.04949,300
2012-05-29$9.91$9.91580,400
2012-05-25$9.79$9.79529,800
2012-05-24$9.90$9.90825,300
2012-05-23$9.60$9.60548,000
2012-05-22$9.50$9.50975,000
2012-05-21$9.41$9.41660,200
2012-05-18$8.95$8.951,228,100
2012-05-17$9.22$9.22680,200
2012-05-16$9.23$9.23500,600
2012-05-15$9.19$9.19529,700
2012-05-14$9.17$9.17500,300
2012-05-11$9.06$9.06544,400
2012-05-10$8.95$8.95516,000
2012-05-09$8.98$8.98925,400
2012-05-08$8.32$8.32485,200
2012-05-07$8.11$8.11429,700
2012-05-04$7.99$7.99773,000
2012-05-03$8.02$8.02440,500
2012-05-02$8.10$8.10417,000
2012-05-01$8.09$8.09982,700
2012-04-30$8.00$8.00440,200
2012-04-27$8.21$8.21686,800
2012-04-26$7.88$7.88386,900
2012-04-25$7.81$7.81499,500
2012-04-24$7.59$7.59387,500
2012-04-23$7.48$7.48626,700
2012-04-20$7.66$7.66928,400
2012-04-19$7.09$7.091,040,200
2012-04-18$7.21$7.21482,700
2012-04-17$7.45$7.45649,700
2012-04-16$7.33$7.33994,800
2012-04-13$7.53$7.53819,600
2012-04-12$7.87$7.87473,600
2012-04-11$7.87$7.87553,000
2012-04-10$7.78$7.78812,700
2012-04-09$8.15$8.15780,600
2012-04-05$8.55$8.55302,700
2012-04-04$8.49$8.49485,900
2012-04-03$8.79$8.79398,200
2012-04-02$8.93$8.93610,700
2012-03-30$8.77$8.77705,800
2012-03-29$9.12$9.12828,600
2012-03-28$9.08$9.08411,000
2012-03-27$9.13$9.13522,500
2012-03-26$9.11$9.11773,500
2012-03-23$8.57$8.57248,000
2012-03-22$8.54$8.54361,900
2012-03-21$8.63$8.63444,100
2012-03-20$8.54$8.54367,600
2012-03-19$8.59$8.59411,300
2012-03-16$8.54$8.541,040,000
2012-03-15$8.40$8.40228,100
2012-03-14$8.28$8.28219,400
2012-03-13$8.32$8.32394,400
2012-03-12$8.21$8.21300,200
2012-03-09$8.31$8.31668,800
2012-03-08$8.21$8.21500,500
2012-03-07$8.33$8.33351,800
2012-03-06$8.34$8.34818,800
2012-03-05$8.87$8.871,053,400
2012-03-02$8.95$8.951,326,300
2012-03-01$8.85$8.85865,300
2012-02-29$9.11$9.111,509,100
2012-02-28$8.61$8.61390,900
2012-02-27$8.64$8.64300,200
2012-02-24$8.92$8.92349,000
2012-02-23$8.73$8.73467,100
2012-02-22$8.32$8.32636,900
2012-02-21$8.35$8.35422,400
2012-02-17$8.49$8.49600,600
2012-02-16$8.73$8.73427,800
2012-02-15$8.37$8.37365,900
2012-02-14$8.41$8.41316,100
2012-02-13$8.62$8.62438,400
2012-02-10$8.33$8.33375,100
2012-02-09$8.59$8.59235,300
2012-02-08$8.68$8.68508,100
2012-02-07$8.75$8.75542,000
2012-02-06$8.79$8.79394,000
2012-02-03$8.80$8.80889,900
2012-02-02$8.59$8.59476,800
2012-02-01$8.39$8.39588,200
2012-01-31$8.16$8.16403,900
2012-01-30$8.24$8.24371,400
2012-01-27$8.25$8.25503,000
2012-01-26$8.16$8.16628,600
2012-01-25$8.13$8.13375,200
2012-01-24$7.85$7.85361,600
2012-01-23$7.80$7.80352,700
2012-01-20$7.90$7.90379,100
2012-01-19$8.00$8.00417,000
2012-01-18$8.02$8.02797,300
2012-01-17$7.87$7.87992,100
2012-01-13$7.60$7.60456,000
2012-01-12$7.59$7.59946,400
2012-01-11$7.38$7.38548,600
2012-01-10$7.44$7.44469,900
2012-01-09$7.27$7.27638,400
2012-01-06$7.27$7.27771,800
2012-01-05$7.44$7.441,203,000
2012-01-04$7.19$7.191,226,700
2012-01-03$7.25$7.25717,800