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 — 2005

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2005-12-30$5.24$5.24426,900
2005-12-29$5.20$5.20234,500
2005-12-28$5.21$5.21305,400
2005-12-27$5.20$5.20244,400
2005-12-23$5.27$5.27306,100
2005-12-22$5.39$5.39325,600
2005-12-21$5.25$5.25203,300
2005-12-20$5.21$5.21249,900
2005-12-19$5.12$5.12375,800
2005-12-16$5.27$5.27783,400
2005-12-15$5.22$5.22348,500
2005-12-14$5.22$5.22306,600
2005-12-13$5.17$5.17475,200
2005-12-12$5.23$5.23197,600
2005-12-09$5.26$5.26227,900
2005-12-08$5.21$5.21440,200
2005-12-07$5.20$5.20337,200
2005-12-06$5.24$5.24436,600
2005-12-05$5.35$5.35439,600
2005-12-02$5.28$5.28372,100
2005-12-01$5.21$5.21349,600
2005-11-30$5.07$5.071,138,400
2005-11-29$5.30$5.30379,900
2005-11-28$5.22$5.22404,100
2005-11-25$5.08$5.08104,700
2005-11-23$5.10$5.10166,900
2005-11-22$5.04$5.04218,800
2005-11-21$5.05$5.05293,100
2005-11-18$4.98$4.98285,200
2005-11-17$4.78$4.78324,700
2005-11-16$4.54$4.54204,000
2005-11-15$4.68$4.68191,100
2005-11-14$4.96$4.96488,000
2005-11-11$5.00$5.00190,200
2005-11-10$5.01$5.01314,100
2005-11-09$4.98$4.98277,100
2005-11-08$4.85$4.85158,200
2005-11-07$4.88$4.88220,900
2005-11-04$4.78$4.78183,500
2005-11-03$4.86$4.86319,000
2005-11-02$4.50$4.50343,000
2005-11-01$4.23$4.23144,800
2005-10-31$4.34$4.34268,800
2005-10-28$4.24$4.24112,300
2005-10-27$4.20$4.20205,200
2005-10-26$4.43$4.43267,600
2005-10-25$4.53$4.53161,300
2005-10-24$4.58$4.58300,700
2005-10-21$4.33$4.33247,100
2005-10-20$4.42$4.42275,500
2005-10-19$4.64$4.64284,800
2005-10-18$4.53$4.53152,100
2005-10-17$4.61$4.61206,200
2005-10-14$4.72$4.72185,800
2005-10-13$4.52$4.52247,100
2005-10-12$4.40$4.40374,500
2005-10-11$4.61$4.61715,300
2005-10-10$5.00$5.00302,200
2005-10-07$5.05$5.05189,400
2005-10-06$5.08$5.08379,900
2005-10-05$5.08$5.08526,200
2005-10-04$5.07$5.07358,800
2005-10-03$5.16$5.16317,200
2005-09-30$5.05$5.05385,200
2005-09-29$5.10$5.10258,600
2005-09-28$5.17$5.17237,500
2005-09-27$5.32$5.32249,700
2005-09-26$5.29$5.29233,100
2005-09-23$5.20$5.20221,700
2005-09-22$5.20$5.20304,300
2005-09-21$5.39$5.39347,000
2005-09-20$5.36$5.36279,200
2005-09-19$5.35$5.35290,000
2005-09-16$5.29$5.29378,800
2005-09-15$5.25$5.25254,000
2005-09-14$5.06$5.06264,200
2005-09-13$5.24$5.24393,500
2005-09-12$5.47$5.47356,600
2005-09-09$5.42$5.42554,400
2005-09-08$5.40$5.40691,800
2005-09-07$5.05$5.05472,300
2005-09-06$5.04$5.04308,400
2005-09-02$5.02$5.02154,700
2005-09-01$5.02$5.02338,300
2005-08-31$5.09$5.09418,200
2005-08-30$4.88$4.88185,800
2005-08-29$5.05$5.05339,100
2005-08-26$4.95$4.95454,200
2005-08-25$5.05$5.05324,900
2005-08-24$5.05$5.05397,000
2005-08-23$4.97$4.97560,600
2005-08-22$5.05$5.05588,600
2005-08-19$5.08$5.08420,900
2005-08-18$4.98$4.98487,600
2005-08-17$5.07$5.07505,900
2005-08-16$5.28$5.28303,700
2005-08-15$5.49$5.49389,300
2005-08-12$5.58$5.58329,100
2005-08-11$5.79$5.79403,400
2005-08-10$5.66$5.66619,300
2005-08-09$5.64$5.64559,600
2005-08-08$5.41$5.411,029,700
2005-08-05$5.65$5.651,705,700
2005-08-04$5.37$5.371,646,800
2005-08-03$4.98$4.98385,700
2005-08-02$4.91$4.91547,500
2005-08-01$4.67$4.67153,800
2005-07-29$4.62$4.62213,200
2005-07-28$4.69$4.69172,900
2005-07-27$4.70$4.70214,200
2005-07-26$4.74$4.74272,600
2005-07-25$4.69$4.69161,800
2005-07-22$4.85$4.85263,800
2005-07-21$4.77$4.77542,400
2005-07-20$4.58$4.58280,800
2005-07-19$4.60$4.60426,900
2005-07-18$4.54$4.54562,200
2005-07-15$4.83$4.83488,300
2005-07-14$4.69$4.69317,200
2005-07-13$4.53$4.53563,600
2005-07-12$4.50$4.50824,000
2005-07-11$4.21$4.21375,100
2005-07-08$4.10$4.10456,200
2005-07-07$4.02$4.02255,600
2005-07-06$3.99$3.99235,000
2005-07-05$3.92$3.92309,700
2005-07-01$3.95$3.95179,800
2005-06-30$3.91$3.91174,900
2005-06-29$4.11$4.11199,600
2005-06-28$4.04$4.04265,800
2005-06-27$3.93$3.93258,600
2005-06-24$4.10$4.10523,000
2005-06-23$4.01$4.01339,600
2005-06-22$4.17$4.17201,600
2005-06-21$4.15$4.15269,300
2005-06-20$4.16$4.16492,800
2005-06-17$4.10$4.10554,800
2005-06-16$4.00$4.00378,000
2005-06-15$3.92$3.92535,600
2005-06-14$3.89$3.89630,100
2005-06-13$3.90$3.90302,000
2005-06-10$3.81$3.81204,300
2005-06-09$3.76$3.76506,400
2005-06-08$3.52$3.52215,400
2005-06-07$3.50$3.50473,400
2005-06-06$3.75$3.75220,700
2005-06-03$3.73$3.73375,100
2005-06-02$3.77$3.77270,900
2005-06-01$3.71$3.71311,600
2005-05-31$3.66$3.66473,800
2005-05-27$3.56$3.56684,600
2005-05-26$3.62$3.621,596,600
2005-05-25$3.94$3.942,334,400
2005-05-24$3.39$3.391,645,200
2005-05-23$2.94$2.94352,100
2005-05-20$2.91$2.91286,500
2005-05-19$2.93$2.93282,100
2005-05-18$2.93$2.93403,400
2005-05-17$2.80$2.80240,200
2005-05-16$2.86$2.86178,900
2005-05-13$2.92$2.92584,200
2005-05-12$2.94$2.94178,100
2005-05-11$2.92$2.92266,200
2005-05-10$2.98$2.98234,400
2005-05-09$3.12$3.12284,500
2005-05-06$3.07$3.07284,000
2005-05-05$2.89$2.89293,400
2005-05-04$2.84$2.84473,200
2005-05-03$2.90$2.90261,700
2005-05-02$2.96$2.96205,600
2005-04-29$2.90$2.90244,600
2005-04-28$2.90$2.90229,900
2005-04-27$3.09$3.09322,100
2005-04-26$2.99$2.99343,900
2005-04-25$3.05$3.05292,400
2005-04-22$3.13$3.13206,900
2005-04-21$3.36$3.36618,200
2005-04-20$3.19$3.19430,600
2005-04-19$2.99$2.99435,100
2005-04-18$2.97$2.97552,300
2005-04-15$3.24$3.24200,700
2005-04-14$3.25$3.25235,900
2005-04-13$3.32$3.32421,600
2005-04-12$3.54$3.54371,000
2005-04-11$3.55$3.55157,400
2005-04-08$3.59$3.59246,600
2005-04-07$3.63$3.63177,600
2005-04-06$3.60$3.60359,400
2005-04-05$3.66$3.66388,300
2005-04-04$3.59$3.59282,200
2005-04-01$3.70$3.70330,400
2005-03-31$3.87$3.87353,900
2005-03-30$3.93$3.93235,500
2005-03-29$3.86$3.86379,400
2005-03-28$4.04$4.04230,100
2005-03-24$4.05$4.05258,400
2005-03-23$4.05$4.05129,700
2005-03-22$4.10$4.10286,400
2005-03-21$4.17$4.171,281,500
2005-03-18$4.04$4.04666,000
2005-03-17$4.10$4.10225,800
2005-03-16$4.04$4.04298,600
2005-03-15$4.09$4.09544,900
2005-03-14$4.13$4.13462,000
2005-03-11$3.95$3.95323,400
2005-03-10$3.98$3.98440,400
2005-03-09$4.09$4.09343,800
2005-03-08$4.20$4.20358,900
2005-03-07$4.22$4.22475,400
2005-03-04$4.49$4.49461,700
2005-03-03$4.47$4.471,346,300
2005-03-02$4.36$4.36663,400
2005-03-01$4.00$4.00430,700
2005-02-28$4.06$4.06503,100
2005-02-25$4.12$4.12305,900
2005-02-24$4.13$4.13486,400
2005-02-23$4.20$4.20271,100
2005-02-22$4.25$4.25387,900
2005-02-18$4.38$4.38539,900
2005-02-17$4.43$4.43402,200
2005-02-16$4.63$4.63295,000
2005-02-15$4.52$4.52227,800
2005-02-14$4.50$4.50475,200
2005-02-11$4.71$4.71348,600
2005-02-10$4.70$4.70456,200
2005-02-09$4.82$4.82254,900
2005-02-08$4.93$4.93179,100
2005-02-07$4.83$4.83621,900
2005-02-04$4.95$4.95317,900
2005-02-03$5.01$5.01434,800
2005-02-02$5.05$5.05271,500
2005-02-01$5.08$5.08205,200
2005-01-31$5.08$5.08208,400
2005-01-28$5.05$5.05311,200
2005-01-27$5.10$5.10259,100
2005-01-26$5.14$5.14307,000
2005-01-25$4.99$4.99262,900
2005-01-24$4.97$4.97472,100
2005-01-21$5.01$5.01410,900
2005-01-20$4.92$4.92315,100
2005-01-19$5.00$5.00280,600
2005-01-18$5.10$5.10398,300
2005-01-14$5.01$5.01493,800
2005-01-13$4.87$4.87525,700
2005-01-12$5.01$5.01340,300
2005-01-11$4.97$4.97748,900
2005-01-10$5.16$5.16502,300
2005-01-07$5.01$5.01461,300
2005-01-06$5.20$5.20240,400
2005-01-05$5.36$5.36464,500
2005-01-04$5.41$5.41600,900
2005-01-03$5.80$5.80367,800