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 — 2009

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2009-12-31$11.11$11.11699,400
2009-12-30$11.26$11.26834,400
2009-12-29$11.12$11.12562,400
2009-12-28$11.16$11.16608,800
2009-12-24$11.19$11.19579,200
2009-12-23$11.17$11.172,886,200
2009-12-22$10.44$10.441,225,300
2009-12-21$10.04$10.041,225,200
2009-12-18$9.94$9.942,520,500
2009-12-17$9.95$9.951,135,400
2009-12-16$10.19$10.191,364,500
2009-12-15$10.00$10.001,249,500
2009-12-14$9.98$9.981,342,400
2009-12-11$9.98$9.981,949,900
2009-12-10$10.15$10.151,246,800
2009-12-09$10.22$10.221,607,700
2009-12-08$10.53$10.532,277,300
2009-12-07$10.54$10.54906,200
2009-12-04$10.53$10.531,768,700
2009-12-03$10.61$10.61859,200
2009-12-02$10.64$10.641,114,000
2009-12-01$10.58$10.582,141,200
2009-11-30$10.71$10.711,945,900
2009-11-27$11.00$11.00394,000
2009-11-25$11.19$11.19636,600
2009-11-24$11.14$11.14767,400
2009-11-23$11.15$11.151,416,200
2009-11-20$11.23$11.231,435,200
2009-11-19$11.03$11.032,087,400
2009-11-18$11.20$11.204,165,200
2009-11-17$11.12$11.1213,238,900
2009-11-16$13.40$13.401,702,900
2009-11-13$13.11$13.111,266,100
2009-11-12$13.40$13.40696,100
2009-11-11$13.56$13.561,037,600
2009-11-10$13.48$13.48724,100
2009-11-09$13.58$13.58943,300
2009-11-06$13.46$13.461,150,100
2009-11-05$13.55$13.551,617,200
2009-11-04$12.56$12.561,128,100
2009-11-03$12.66$12.66797,200
2009-11-02$12.38$12.381,505,900
2009-10-30$12.67$12.671,554,400
2009-10-29$12.52$12.52941,400
2009-10-28$12.31$12.311,835,600
2009-10-27$12.82$12.821,395,400
2009-10-26$13.16$13.161,238,000
2009-10-23$13.85$13.851,524,900
2009-10-22$13.80$13.801,493,900
2009-10-21$13.27$13.271,584,800
2009-10-20$13.66$13.661,074,100
2009-10-19$13.98$13.98802,000
2009-10-16$13.96$13.961,085,100
2009-10-15$13.86$13.861,313,400
2009-10-14$13.94$13.941,130,800
2009-10-13$13.55$13.551,117,800
2009-10-12$13.86$13.86373,800
2009-10-09$14.02$14.02370,700
2009-10-08$13.82$13.82850,300
2009-10-07$13.88$13.881,076,300
2009-10-06$14.16$14.161,040,300
2009-10-05$13.76$13.76958,800
2009-10-02$13.88$13.88809,100
2009-10-01$14.02$14.02909,700
2009-09-30$14.57$14.57643,500
2009-09-29$14.83$14.83578,700
2009-09-28$15.05$15.05617,200
2009-09-25$14.56$14.56758,400
2009-09-24$14.84$14.84724,800
2009-09-23$15.18$15.18810,000
2009-09-22$15.09$15.09899,300
2009-09-21$15.20$15.20486,400
2009-09-18$15.24$15.241,164,600
2009-09-17$15.23$15.23638,900
2009-09-16$15.12$15.121,322,300
2009-09-15$15.52$15.52453,700
2009-09-14$15.66$15.66850,700
2009-09-11$15.49$15.49575,100
2009-09-10$15.66$15.66545,600
2009-09-09$15.53$15.53547,400
2009-09-08$15.43$15.43476,200
2009-09-04$15.48$15.48477,000
2009-09-03$15.24$15.24646,300
2009-09-02$15.53$15.53415,400
2009-09-01$15.69$15.69832,100
2009-08-31$16.14$16.14729,000
2009-08-28$16.15$16.15455,700
2009-08-27$16.47$16.47814,600
2009-08-26$16.27$16.27816,600
2009-08-25$16.00$16.00865,900
2009-08-24$16.00$16.00483,100
2009-08-21$15.92$15.92672,500
2009-08-20$15.52$15.52450,900
2009-08-19$15.52$15.52524,600
2009-08-18$15.29$15.29843,200
2009-08-17$15.32$15.32695,500
2009-08-14$15.68$15.68845,900
2009-08-13$16.03$16.03804,500
2009-08-12$15.78$15.781,164,400
2009-08-11$15.87$15.871,134,000
2009-08-10$16.48$16.48635,400
2009-08-07$16.50$16.501,230,700
2009-08-06$17.05$17.051,454,600
2009-08-05$18.41$18.41659,800
2009-08-04$18.70$18.70762,200
2009-08-03$18.45$18.45606,600
2009-07-31$18.28$18.28489,100
2009-07-30$18.38$18.38654,300
2009-07-29$18.03$18.03560,500
2009-07-28$17.92$17.92572,300
2009-07-27$17.45$17.45686,300
2009-07-24$17.61$17.61493,200
2009-07-23$17.30$17.301,260,300
2009-07-22$16.48$16.48763,400
2009-07-21$16.39$16.39586,400
2009-07-20$16.39$16.39495,900
2009-07-17$16.08$16.08645,400
2009-07-16$15.70$15.70432,600
2009-07-15$15.71$15.71570,500
2009-07-14$15.35$15.35341,500
2009-07-13$15.37$15.37461,400
2009-07-10$15.05$15.05459,600
2009-07-09$15.26$15.26576,600
2009-07-08$15.25$15.25736,700
2009-07-07$15.44$15.44492,700
2009-07-06$15.86$15.86408,000
2009-07-02$15.83$15.83528,800
2009-07-01$16.32$16.32845,900
2009-06-30$16.50$16.50673,100
2009-06-29$16.64$16.64677,800
2009-06-26$16.59$16.591,625,900
2009-06-25$16.08$16.08761,900
2009-06-24$15.39$15.39563,900
2009-06-23$15.02$15.02510,000
2009-06-22$15.07$15.07562,300
2009-06-19$15.51$15.512,132,800
2009-06-18$15.39$15.39555,200
2009-06-17$15.30$15.301,221,100
2009-06-16$14.65$14.651,030,600
2009-06-15$14.35$14.351,192,300
2009-06-12$15.28$15.28531,300
2009-06-11$15.41$15.41500,800
2009-06-10$15.27$15.27737,300
2009-06-09$15.40$15.40656,900
2009-06-08$15.07$15.07536,600
2009-06-05$15.13$15.13680,300
2009-06-04$15.33$15.33704,000
2009-06-03$15.15$15.15779,600
2009-06-02$14.89$14.891,593,900
2009-06-01$14.28$14.281,038,900
2009-05-29$13.80$13.80914,100
2009-05-28$13.63$13.63589,600
2009-05-27$13.59$13.59654,300
2009-05-26$13.66$13.66874,900
2009-05-22$13.13$13.13721,300
2009-05-21$13.50$13.501,327,700
2009-05-20$13.88$13.883,608,100
2009-05-19$15.48$15.48587,600
2009-05-18$15.39$15.39443,400
2009-05-15$14.91$14.91616,600
2009-05-14$15.22$15.22394,300
2009-05-13$15.31$15.31619,000
2009-05-12$15.84$15.84702,000
2009-05-11$15.86$15.86720,700
2009-05-08$15.50$15.50796,200
2009-05-07$15.07$15.07764,400
2009-05-06$15.24$15.241,270,400
2009-05-05$15.93$15.93544,800
2009-05-04$15.72$15.72542,200
2009-05-01$15.39$15.39499,000
2009-04-30$15.68$15.68824,000
2009-04-29$16.10$16.10753,300
2009-04-28$15.72$15.72594,500
2009-04-27$15.65$15.65878,200
2009-04-24$15.92$15.92789,200
2009-04-23$15.64$15.64727,800
2009-04-22$15.50$15.501,053,200
2009-04-21$15.72$15.721,029,200
2009-04-20$15.32$15.32676,500
2009-04-17$15.32$15.32567,000
2009-04-16$15.28$15.28746,500
2009-04-15$14.96$14.96718,500
2009-04-14$14.67$14.67612,500
2009-04-13$15.26$15.26476,800
2009-04-09$15.18$15.18620,000
2009-04-08$14.84$14.84416,700
2009-04-07$14.34$14.34491,300
2009-04-06$14.70$14.70479,700
2009-04-03$14.98$14.98556,300
2009-04-02$15.30$15.301,141,200
2009-04-01$14.68$14.68669,600
2009-03-31$15.01$15.011,015,400
2009-03-30$14.82$14.82575,100
2009-03-27$15.12$15.12880,300
2009-03-26$15.12$15.121,429,400
2009-03-25$14.56$14.56732,300
2009-03-24$13.89$13.89453,100
2009-03-23$14.29$14.29745,700
2009-03-20$13.49$13.491,466,500
2009-03-19$13.57$13.57455,600
2009-03-18$13.89$13.89861,600
2009-03-17$13.48$13.481,072,300
2009-03-16$13.57$13.57547,100
2009-03-13$13.81$13.81587,800
2009-03-12$13.18$13.181,383,000
2009-03-11$12.37$12.37897,900
2009-03-10$13.16$13.161,169,800
2009-03-09$12.38$12.38822,300
2009-03-06$12.13$12.13839,100
2009-03-05$11.70$11.70907,200
2009-03-04$12.47$12.47806,000
2009-03-03$12.14$12.14884,900
2009-03-02$12.04$12.04990,600
2009-02-27$12.86$12.86855,500
2009-02-26$13.69$13.69744,900
2009-02-25$14.31$14.311,716,000
2009-02-24$13.59$13.59728,200
2009-02-23$13.02$13.02631,900
2009-02-20$13.24$13.24836,900
2009-02-19$13.68$13.68387,000
2009-02-18$13.87$13.87610,300
2009-02-17$14.25$14.25731,900
2009-02-13$14.65$14.65400,300
2009-02-12$15.10$15.10576,100
2009-02-11$14.94$14.94537,700
2009-02-10$14.50$14.50756,600
2009-02-09$15.15$15.15480,900
2009-02-06$15.31$15.31733,200
2009-02-05$15.08$15.08579,000
2009-02-04$14.82$14.82813,000
2009-02-03$14.80$14.80685,000
2009-02-02$14.22$14.22780,200
2009-01-30$14.13$14.13818,100
2009-01-29$13.83$13.83827,700
2009-01-28$14.60$14.60791,600
2009-01-27$14.15$14.15818,200
2009-01-26$13.66$13.66557,200
2009-01-23$13.30$13.30706,900
2009-01-22$13.23$13.23753,000
2009-01-21$13.61$13.61882,600
2009-01-20$12.57$12.57998,000
2009-01-16$13.99$13.99617,000
2009-01-15$14.09$14.09504,800
2009-01-14$13.92$13.92575,300
2009-01-13$14.13$14.13668,700
2009-01-12$13.87$13.87633,300
2009-01-09$13.93$13.93739,700
2009-01-08$14.01$14.01601,400
2009-01-07$14.10$14.10736,100
2009-01-06$14.86$14.86909,400
2009-01-05$14.41$14.41630,200
2009-01-02$14.47$14.47369,300