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 — 2003

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2003-12-31$6.50$6.50544,800
2003-12-30$6.76$6.76509,800
2003-12-29$6.81$6.81779,200
2003-12-26$6.76$6.76272,700
2003-12-24$6.74$6.74610,000
2003-12-23$6.45$6.451,408,000
2003-12-22$5.94$5.94428,600
2003-12-19$5.74$5.74517,600
2003-12-18$5.62$5.62331,900
2003-12-17$5.41$5.41223,100
2003-12-16$5.55$5.55225,700
2003-12-15$5.38$5.38357,400
2003-12-12$5.62$5.62172,500
2003-12-11$5.48$5.48423,300
2003-12-10$5.20$5.20432,500
2003-12-09$5.41$5.41599,000
2003-12-08$5.44$5.44359,500
2003-12-05$5.61$5.61237,300
2003-12-04$5.60$5.60326,700
2003-12-03$5.61$5.61411,400
2003-12-02$5.69$5.69463,200
2003-12-01$5.87$5.87686,800
2003-11-28$5.89$5.89346,200
2003-11-26$5.89$5.89402,300
2003-11-25$5.94$5.94408,700
2003-11-24$6.02$6.02515,000
2003-11-21$5.70$5.701,613,600
2003-11-20$5.56$5.56658,100
2003-11-19$5.60$5.60562,600
2003-11-18$5.46$5.46382,700
2003-11-17$5.50$5.50637,400
2003-11-14$5.61$5.61911,400
2003-11-13$5.98$5.98330,200
2003-11-12$5.99$5.99357,800
2003-11-11$5.65$5.65285,000
2003-11-10$5.82$5.82327,700
2003-11-07$6.15$6.15285,500
2003-11-06$6.10$6.10562,700
2003-11-05$6.28$6.28503,300
2003-11-04$6.26$6.26947,100
2003-11-03$6.54$6.54449,300
2003-10-31$6.65$6.65488,600
2003-10-30$6.61$6.61608,700
2003-10-29$6.47$6.47478,500
2003-10-28$6.45$6.45524,300
2003-10-27$6.30$6.30956,700
2003-10-24$6.14$6.14487,000
2003-10-23$6.22$6.22543,800
2003-10-22$6.25$6.25428,800
2003-10-21$6.35$6.35427,400
2003-10-20$6.29$6.29484,300
2003-10-17$6.20$6.20499,900
2003-10-16$6.50$6.50254,300
2003-10-15$6.53$6.53175,100
2003-10-14$6.72$6.72168,000
2003-10-13$6.69$6.69256,800
2003-10-10$6.50$6.50218,600
2003-10-09$6.60$6.60362,800
2003-10-08$6.50$6.50347,200
2003-10-07$6.62$6.62521,800
2003-10-06$6.60$6.60422,900
2003-10-03$6.65$6.65546,000
2003-10-02$6.67$6.67342,400
2003-10-01$6.60$6.60443,400
2003-09-30$6.52$6.52327,200
2003-09-29$6.53$6.53500,700
2003-09-26$6.41$6.41549,100
2003-09-25$6.77$6.77602,400
2003-09-24$6.83$6.83836,500
2003-09-23$7.50$7.50590,900
2003-09-22$7.61$7.61526,400
2003-09-19$8.05$8.05434,400
2003-09-18$7.85$7.85551,700
2003-09-17$7.52$7.52516,700
2003-09-16$7.50$7.50664,600
2003-09-15$7.13$7.13347,000
2003-09-12$7.20$7.20503,300
2003-09-11$7.20$7.20501,900
2003-09-10$7.36$7.361,223,900
2003-09-09$7.31$7.311,054,500
2003-09-08$7.03$7.031,468,400
2003-09-05$6.51$6.511,101,700
2003-09-04$6.20$6.20312,700
2003-09-03$6.31$6.31299,700
2003-09-02$6.39$6.39462,500
2003-08-29$6.61$6.61777,800
2003-08-28$6.29$6.29555,900
2003-08-27$5.81$5.81216,400
2003-08-26$5.75$5.75292,300
2003-08-25$5.76$5.76157,800
2003-08-22$5.84$5.84361,700
2003-08-21$5.96$5.96342,100
2003-08-20$5.88$5.88290,500
2003-08-19$5.78$5.78362,600
2003-08-18$5.68$5.68439,500
2003-08-15$5.40$5.4093,200
2003-08-14$5.46$5.46167,100
2003-08-13$5.35$5.35122,200
2003-08-12$5.43$5.43243,900
2003-08-11$5.34$5.34520,700
2003-08-08$5.33$5.33728,800
2003-08-07$5.03$5.03552,500
2003-08-06$4.72$4.72480,900
2003-08-05$4.92$4.92414,500
2003-08-04$4.98$4.98298,500
2003-08-01$5.01$5.01147,900
2003-07-31$5.19$5.19266,000
2003-07-30$5.12$5.12237,500
2003-07-29$5.00$5.00348,600
2003-07-28$5.15$5.15313,100
2003-07-25$4.97$4.97342,400
2003-07-24$5.07$5.07199,000
2003-07-23$5.09$5.09270,100
2003-07-22$5.30$5.30415,700
2003-07-21$5.11$5.11289,500
2003-07-18$5.33$5.33219,600
2003-07-17$5.30$5.30412,600
2003-07-16$5.50$5.50336,700
2003-07-15$5.52$5.52409,600
2003-07-14$5.49$5.49571,600
2003-07-11$5.41$5.41520,800
2003-07-10$5.46$5.46209,200
2003-07-09$5.69$5.69343,700
2003-07-08$5.55$5.55258,100
2003-07-07$5.48$5.48411,500
2003-07-03$5.32$5.32222,500
2003-07-02$5.25$5.25610,200
2003-07-01$5.17$5.17631,000
2003-06-30$5.34$5.34694,600
2003-06-27$5.40$5.40288,400
2003-06-26$5.72$5.72542,900
2003-06-25$5.44$5.44788,600
2003-06-24$5.75$5.751,001,300
2003-06-23$5.02$5.02575,900
2003-06-20$5.31$5.31403,800
2003-06-19$5.37$5.37846,100
2003-06-18$5.88$5.88661,100
2003-06-17$6.09$6.09386,900
2003-06-16$6.31$6.311,194,000
2003-06-13$6.42$6.42341,300
2003-06-12$6.67$6.67523,000
2003-06-11$6.45$6.45557,200
2003-06-10$6.08$6.08303,500
2003-06-09$6.03$6.03334,300
2003-06-06$6.21$6.211,094,300
2003-06-05$6.37$6.371,231,700
2003-06-04$6.03$6.03647,300
2003-06-03$5.83$5.831,171,300
2003-06-02$6.15$6.151,180,100
2003-05-30$6.39$6.39780,400
2003-05-29$6.22$6.22661,500
2003-05-28$5.95$5.951,865,800
2003-05-27$5.68$5.68600,200
2003-05-23$5.56$5.56316,600
2003-05-22$5.47$5.47323,300
2003-05-21$5.36$5.36406,400
2003-05-20$5.63$5.63332,700
2003-05-19$5.22$5.22408,800
2003-05-16$5.43$5.43606,900
2003-05-15$5.87$5.87500,400
2003-05-14$5.81$5.81385,500
2003-05-13$5.44$5.44329,400
2003-05-12$5.46$5.46333,600
2003-05-09$5.14$5.14260,800
2003-05-08$5.15$5.15889,200
2003-05-07$5.25$5.25572,700
2003-05-06$5.57$5.57566,100
2003-05-05$5.80$5.80540,600
2003-05-02$5.60$5.601,176,100
2003-05-01$5.54$5.54547,000
2003-04-30$5.53$5.53864,500
2003-04-29$4.92$4.92302,900
2003-04-28$4.64$4.64282,400
2003-04-25$4.62$4.62408,700
2003-04-24$4.46$4.46465,900
2003-04-23$4.39$4.39452,800
2003-04-22$4.35$4.35603,700
2003-04-21$4.45$4.45859,700
2003-04-17$4.00$4.00244,600
2003-04-16$3.89$3.89206,900
2003-04-15$3.95$3.95237,700
2003-04-14$3.86$3.86181,000
2003-04-11$3.80$3.80477,300
2003-04-10$3.81$3.81158,100
2003-04-09$3.93$3.93428,100
2003-04-08$3.93$3.93404,700
2003-04-07$3.74$3.74475,600
2003-04-04$3.74$3.74449,700
2003-04-03$3.76$3.76395,900
2003-04-02$3.75$3.751,171,200
2003-04-01$3.75$3.75649,100
2003-03-31$3.58$3.58934,000
2003-03-28$3.31$3.311,879,900
2003-03-27$3.29$3.29387,900
2003-03-26$3.28$3.28677,800
2003-03-25$3.10$3.10564,000
2003-03-24$3.12$3.121,419,400
2003-03-21$3.00$3.00919,600
2003-03-20$3.00$3.00820,900
2003-03-19$2.98$2.981,923,500
2003-03-18$2.80$2.801,594,500
2003-03-17$2.83$2.835,320,800
2003-03-14$4.16$4.161,226,100
2003-03-13$3.96$3.96358,500
2003-03-12$3.90$3.90257,700
2003-03-11$3.94$3.94782,700
2003-03-10$3.86$3.86700,500
2003-03-07$4.14$4.14997,700
2003-03-06$4.44$4.44916,800
2003-03-05$4.27$4.27359,200
2003-03-04$4.31$4.31443,500
2003-03-03$4.33$4.33798,400
2003-02-28$4.48$4.48471,500
2003-02-27$4.38$4.38554,900
2003-02-26$4.50$4.50991,700
2003-02-25$4.60$4.60554,100
2003-02-24$4.36$4.36991,200
2003-02-21$4.50$4.50532,800
2003-02-20$4.60$4.60875,200
2003-02-19$4.66$4.66462,900
2003-02-18$4.81$4.81529,000
2003-02-14$4.93$4.93399,500
2003-02-13$5.02$5.02771,700
2003-02-12$5.00$5.002,065,200
2003-02-11$4.89$4.891,021,200
2003-02-10$4.98$4.981,145,900
2003-02-07$4.99$4.99892,900
2003-02-06$5.01$5.01404,000
2003-02-05$5.10$5.10917,700
2003-02-04$5.05$5.051,793,000
2003-02-03$5.70$5.70483,800
2003-01-31$5.99$5.99676,200
2003-01-30$5.89$5.89871,400
2003-01-29$6.16$6.16507,000
2003-01-28$6.34$6.34393,200
2003-01-27$6.32$6.321,030,300
2003-01-24$6.63$6.63599,200
2003-01-23$7.15$7.15937,400
2003-01-22$7.29$7.291,174,200
2003-01-21$7.29$7.29792,300
2003-01-17$7.03$7.03479,500
2003-01-16$6.92$6.92590,100
2003-01-15$6.79$6.79517,200
2003-01-14$6.55$6.55850,300
2003-01-13$6.46$6.46463,500
2003-01-10$6.47$6.47408,300
2003-01-09$6.39$6.39356,200
2003-01-08$6.34$6.34383,400
2003-01-07$6.45$6.45437,400
2003-01-06$6.60$6.60416,800
2003-01-03$6.51$6.51741,000
2003-01-02$6.84$6.84393,700