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 — 2001

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2001-12-31$22.19$22.19616,800
2001-12-28$23.08$23.08512,700
2001-12-27$22.55$22.55364,400
2001-12-26$22.76$22.76455,800
2001-12-24$21.81$21.81176,400
2001-12-21$21.39$21.39834,500
2001-12-20$21.17$21.17575,900
2001-12-19$22.34$22.34607,800
2001-12-18$22.05$22.05447,900
2001-12-17$22.38$22.38796,500
2001-12-14$21.84$21.84718,600
2001-12-13$21.99$21.991,679,100
2001-12-12$19.15$19.15914,700
2001-12-11$20.28$20.281,281,500
2001-12-10$19.89$19.892,157,700
2001-12-07$22.76$22.76415,900
2001-12-06$23.21$23.21272,400
2001-12-05$23.15$23.15705,400
2001-12-04$24.01$24.01831,400
2001-12-03$22.83$22.83324,800
2001-11-30$22.75$22.75542,700
2001-11-29$23.00$23.001,135,500
2001-11-28$22.43$22.432,498,400
2001-11-27$25.43$25.43472,300
2001-11-26$26.65$26.65744,300
2001-11-23$25.59$25.59153,200
2001-11-21$25.64$25.64450,800
2001-11-20$25.40$25.401,105,900
2001-11-19$24.17$24.17697,600
2001-11-16$23.22$23.22705,200
2001-11-15$22.80$22.80614,000
2001-11-14$22.79$22.79482,900
2001-11-13$22.82$22.82395,100
2001-11-12$21.76$21.76354,900
2001-11-09$21.92$21.92407,900
2001-11-08$22.20$22.20800,000
2001-11-07$21.60$21.60682,500
2001-11-06$21.85$21.85972,400
2001-11-05$21.50$21.50578,600
2001-11-02$21.25$21.25270,200
2001-11-01$21.98$21.98417,200
2001-10-31$20.76$20.76332,200
2001-10-30$21.25$21.25621,500
2001-10-29$21.92$21.92685,500
2001-10-26$21.88$21.881,078,300
2001-10-25$20.65$20.651,064,300
2001-10-24$20.40$20.40610,300
2001-10-23$21.29$21.293,452,800
2001-10-22$20.15$20.15819,300
2001-10-19$19.87$19.87760,600
2001-10-18$19.72$19.72807,300
2001-10-17$20.95$20.95685,000
2001-10-16$21.45$21.45896,200
2001-10-15$20.21$20.21729,800
2001-10-12$19.30$19.30558,600
2001-10-11$19.90$19.901,352,700
2001-10-10$18.92$18.92876,600
2001-10-09$17.98$17.981,119,300
2001-10-08$18.30$18.30513,500
2001-10-05$18.15$18.15518,400
2001-10-04$18.09$18.09320,100
2001-10-03$17.89$17.89580,500
2001-10-02$18.15$18.15419,100
2001-10-01$18.31$18.311,307,800
2001-09-28$17.05$17.051,811,800
2001-09-27$14.98$14.98378,000
2001-09-26$14.42$14.42470,400
2001-09-25$15.00$15.00442,500
2001-09-24$14.60$14.60240,900
2001-09-21$14.35$14.35614,600
2001-09-20$16.02$16.02599,500
2001-09-19$15.20$15.20805,800
2001-09-18$15.99$15.99587,600
2001-09-17$15.97$15.97720,300
2001-09-10$17.61$17.61809,700
2001-09-07$17.60$17.60935,900
2001-09-06$17.52$17.52669,400
2001-09-05$17.87$17.87626,600
2001-09-04$17.30$17.30802,000
2001-08-31$16.30$16.30269,100
2001-08-30$16.17$16.17535,500
2001-08-29$16.00$16.00747,100
2001-08-28$16.33$16.33938,900
2001-08-27$16.01$16.01781,500
2001-08-24$16.35$16.351,784,500
2001-08-23$15.03$15.032,128,600
2001-08-22$14.89$14.894,384,600
2001-08-21$10.08$10.0898,300
2001-08-20$10.10$10.1090,600
2001-08-17$10.06$10.06174,200
2001-08-16$10.05$10.05186,000
2001-08-15$10.52$10.5284,600
2001-08-14$10.55$10.55117,600
2001-08-13$10.60$10.60115,300
2001-08-10$10.53$10.53118,900
2001-08-09$10.80$10.80363,400
2001-08-08$11.13$11.1399,300
2001-08-07$11.96$11.96103,300
2001-08-06$11.92$11.92203,800
2001-08-03$11.95$11.95251,800
2001-08-02$12.03$12.03141,500
2001-08-01$12.22$12.22116,500
2001-07-31$11.97$11.97144,000
2001-07-30$11.99$11.9950,700
2001-07-27$12.17$12.1795,400
2001-07-26$11.76$11.76186,400
2001-07-25$11.89$11.89198,300
2001-07-24$12.48$12.48208,000
2001-07-23$12.76$12.76166,200
2001-07-20$13.61$13.61434,500
2001-07-19$12.96$12.96488,500
2001-07-18$12.48$12.48309,900
2001-07-17$12.13$12.13110,400
2001-07-16$12.08$12.08300,600
2001-07-13$11.90$11.9058,400
2001-07-12$12.04$12.0498,200
2001-07-11$11.96$11.96186,700
2001-07-10$12.18$12.18203,300
2001-07-09$11.88$11.88266,100
2001-07-06$12.25$12.25150,900
2001-07-05$12.08$12.0897,000
2001-07-03$12.34$12.3450,500
2001-07-02$12.00$12.00143,900
2001-06-29$12.39$12.39386,100
2001-06-28$11.89$11.89313,500
2001-06-27$11.50$11.50153,400
2001-06-26$11.45$11.45283,200
2001-06-25$11.09$11.09421,500
2001-06-22$11.47$11.47144,900
2001-06-21$11.61$11.61232,800
2001-06-20$11.74$11.74453,200
2001-06-19$11.30$11.30142,300
2001-06-18$11.50$11.50360,000
2001-06-15$11.68$11.68208,900
2001-06-14$11.33$11.3397,200
2001-06-13$11.44$11.44109,800
2001-06-12$11.60$11.60171,600
2001-06-11$11.70$11.70175,500
2001-06-08$11.76$11.76156,600
2001-06-07$12.26$12.26122,300
2001-06-06$12.48$12.48279,700
2001-06-05$12.92$12.92599,300
2001-06-04$12.04$12.04184,100
2001-06-01$12.00$12.00203,700
2001-05-31$12.00$12.00131,000
2001-05-30$11.98$11.98172,600
2001-05-29$12.35$12.35561,600
2001-05-25$12.20$12.20567,100
2001-05-24$12.20$12.20694,800
2001-05-23$12.09$12.09797,500
2001-05-22$11.90$11.90302,200
2001-05-21$11.90$11.90576,400
2001-05-18$11.44$11.44535,400
2001-05-17$11.38$11.38199,200
2001-05-16$10.82$10.82351,900
2001-05-15$11.01$11.01143,100
2001-05-14$11.64$11.64359,900
2001-05-11$12.32$12.32189,900
2001-05-10$12.13$12.13258,000
2001-05-09$11.57$11.5779,600
2001-05-08$11.36$11.36201,800
2001-05-07$11.84$11.84199,500
2001-05-04$11.00$11.00160,300
2001-05-03$10.94$10.94147,100
2001-05-02$11.04$11.0493,300
2001-05-01$11.00$11.0099,900
2001-04-30$11.00$11.00182,000
2001-04-27$10.35$10.35132,800
2001-04-26$10.25$10.25195,200
2001-04-25$10.46$10.46101,600
2001-04-24$9.65$9.65117,100
2001-04-23$9.51$9.5156,200
2001-04-20$10.00$10.0085,800
2001-04-19$10.00$10.00186,200
2001-04-18$10.15$10.15301,700
2001-04-17$9.50$9.5074,900
2001-04-16$9.23$9.23134,200
2001-04-12$8.95$8.95296,400
2001-04-11$9.01$9.01145,000
2001-04-10$9.07$9.07102,200
2001-04-09$8.58$8.58119,500
2001-04-06$8.63$8.63137,000
2001-04-05$8.81$8.81200,400
2001-04-04$7.94$7.94148,000
2001-04-03$8.50$8.50171,900
2001-04-02$8.38$8.38229,000
2001-03-30$9.25$9.2576,500
2001-03-29$9.09$9.0979,300
2001-03-28$8.81$8.81136,600
2001-03-27$9.69$9.69255,900
2001-03-26$8.84$8.84121,200
2001-03-23$8.53$8.53318,900
2001-03-22$8.00$8.00349,500
2001-03-21$9.25$9.25219,200
2001-03-20$9.50$9.50125,000
2001-03-19$9.88$9.88134,300
2001-03-16$8.88$8.88222,000
2001-03-15$9.75$9.75114,500
2001-03-14$9.56$9.56148,800
2001-03-13$9.75$9.75240,600
2001-03-12$9.38$9.38263,900
2001-03-09$10.38$10.38155,800
2001-03-08$10.28$10.2847,400
2001-03-07$10.81$10.8182,400
2001-03-06$10.63$10.6345,100
2001-03-05$10.44$10.4489,900
2001-03-02$10.56$10.56165,100
2001-03-01$10.50$10.50121,000
2001-02-28$10.88$10.88136,700
2001-02-27$10.50$10.5069,900
2001-02-26$11.88$11.88120,600
2001-02-23$10.94$10.94238,200
2001-02-22$11.06$11.06163,600
2001-02-21$11.31$11.31100,000
2001-02-20$11.38$11.38216,400
2001-02-16$11.75$11.75147,500
2001-02-15$12.00$12.00100,900
2001-02-14$11.75$11.7590,300
2001-02-13$12.31$12.31185,400
2001-02-12$12.44$12.44165,700
2001-02-09$11.94$11.94135,000
2001-02-08$11.88$11.88103,300
2001-02-07$11.69$11.69133,200
2001-02-06$12.25$12.25166,700
2001-02-05$11.69$11.69105,500
2001-02-02$11.69$11.69136,500
2001-02-01$12.33$12.33159,000
2001-01-31$12.38$12.38181,400
2001-01-30$12.94$12.94308,800
2001-01-29$12.06$12.06113,000
2001-01-26$12.00$12.00119,100
2001-01-25$12.19$12.19120,600
2001-01-24$12.38$12.38143,200
2001-01-23$12.13$12.13214,200
2001-01-22$11.75$11.75188,800
2001-01-19$11.25$11.25183,100
2001-01-18$11.69$11.69118,100
2001-01-17$11.13$11.13286,400
2001-01-16$11.75$11.75559,700
2001-01-12$10.13$10.13172,800
2001-01-11$10.38$10.38202,500
2001-01-10$9.78$9.78130,100
2001-01-09$9.50$9.50133,100
2001-01-08$9.25$9.25368,100
2001-01-05$9.50$9.50189,900
2001-01-04$10.19$10.19207,100
2001-01-03$10.38$10.38288,400
2001-01-02$9.63$9.63183,800