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.

View year

Historical Stock Price — 2017

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2017-12-29$50.30$50.30569,500
2017-12-28$50.72$50.72605,200
2017-12-27$50.88$50.88434,000
2017-12-26$50.73$50.73419,900
2017-12-22$50.86$50.86643,400
2017-12-21$51.40$51.40609,000
2017-12-20$50.73$50.73691,600
2017-12-19$50.93$50.93942,900
2017-12-18$52.29$52.29658,100
2017-12-15$52.43$52.431,534,200
2017-12-14$51.56$51.56892,200
2017-12-13$53.57$53.57631,300
2017-12-12$53.35$53.35648,900
2017-12-11$53.14$53.141,077,400
2017-12-08$54.60$54.60609,300
2017-12-07$53.93$53.93626,200
2017-12-06$52.54$52.54901,500
2017-12-05$52.46$52.46749,400
2017-12-04$52.26$52.261,246,500
2017-12-01$56.93$56.931,149,200
2017-11-30$55.49$55.491,252,800
2017-11-29$53.07$53.07795,000
2017-11-28$52.93$52.931,354,600
2017-11-27$52.48$52.48972,600
2017-11-24$54.53$54.53255,000
2017-11-22$54.34$54.34347,500
2017-11-21$54.52$54.52476,400
2017-11-20$53.74$53.74683,700
2017-11-17$54.15$54.15417,000
2017-11-16$54.36$54.36701,100
2017-11-15$53.65$53.65909,100
2017-11-14$53.53$53.531,084,700
2017-11-13$54.84$54.84527,300
2017-11-10$55.88$55.88699,500
2017-11-09$55.12$55.12792,900
2017-11-08$54.76$54.761,690,500
2017-11-07$52.30$52.301,545,300
2017-11-06$54.25$54.251,114,700
2017-11-03$54.16$54.161,778,900
2017-11-02$51.82$51.823,042,100
2017-11-01$57.76$57.761,305,300
2017-10-31$57.11$57.111,289,000
2017-10-30$58.31$58.311,284,100
2017-10-27$56.40$56.401,483,900
2017-10-26$54.32$54.321,264,100
2017-10-25$54.02$54.021,560,000
2017-10-24$55.01$55.016,253,400
2017-10-23$62.80$62.801,262,300
2017-10-20$64.39$64.391,631,600
2017-10-19$63.66$63.661,607,600
2017-10-18$63.89$63.891,839,000
2017-10-17$63.85$63.851,988,800
2017-10-16$61.15$61.152,409,800
2017-10-13$59.10$59.101,958,300
2017-10-12$57.73$57.731,152,600
2017-10-11$57.31$57.311,028,400
2017-10-10$55.84$55.84561,000
2017-10-09$55.12$55.12535,700
2017-10-06$55.55$55.55688,900
2017-10-05$56.01$56.011,006,300
2017-10-04$54.31$54.31860,800
2017-10-03$52.69$52.69899,200
2017-10-02$52.91$52.911,216,200
2017-09-29$50.70$50.703,364,300
2017-09-28$52.61$52.61687,700
2017-09-27$51.89$51.891,529,700
2017-09-26$52.40$52.40649,500
2017-09-25$52.72$52.72961,800
2017-09-22$51.32$51.321,094,800
2017-09-21$51.83$51.831,913,900
2017-09-20$53.88$53.884,256,300
2017-09-19$59.07$59.07925,600
2017-09-18$59.57$59.571,000,300
2017-09-15$59.23$59.231,500,900
2017-09-14$58.37$58.37856,600
2017-09-13$57.74$57.74611,600
2017-09-12$57.75$57.75988,400
2017-09-11$56.73$56.73898,400
2017-09-08$56.16$56.16723,800
2017-09-07$56.43$56.431,135,100
2017-09-06$55.17$55.17870,400
2017-09-05$54.85$54.851,224,500
2017-09-01$54.19$54.19673,500
2017-08-31$53.62$53.621,222,800
2017-08-30$50.99$50.99955,200
2017-08-29$48.86$48.86822,000
2017-08-28$48.93$48.93612,700
2017-08-25$47.99$47.99732,800
2017-08-24$49.45$49.45676,800
2017-08-23$48.45$48.45441,900
2017-08-22$48.88$48.88975,500
2017-08-21$46.48$46.48947,100
2017-08-18$46.98$46.98673,200
2017-08-17$47.15$47.151,389,800
2017-08-16$47.41$47.41965,700
2017-08-15$46.53$46.53865,000
2017-08-14$47.16$47.161,061,300
2017-08-11$46.76$46.762,628,000
2017-08-10$45.56$45.561,997,900
2017-08-09$48.06$48.061,249,700
2017-08-08$48.31$48.312,751,000
2017-08-07$52.56$52.561,048,900
2017-08-04$52.36$52.36676,300
2017-08-03$51.02$51.02764,400
2017-08-02$50.78$50.78987,900
2017-08-01$50.94$50.941,096,900
2017-07-31$52.40$52.40883,800
2017-07-28$52.77$52.771,061,500
2017-07-27$52.08$52.081,653,000
2017-07-26$54.33$54.331,482,900
2017-07-25$54.71$54.715,231,500
2017-07-24$59.56$59.561,742,100
2017-07-21$56.39$56.391,165,800
2017-07-20$55.86$55.861,269,500
2017-07-19$54.42$54.42969,200
2017-07-18$53.94$53.941,440,300
2017-07-17$53.01$53.011,061,000
2017-07-14$51.60$51.60567,100
2017-07-13$51.72$51.721,114,500
2017-07-12$51.97$51.971,002,200
2017-07-11$52.31$52.31770,200
2017-07-10$51.50$51.501,367,300
2017-07-07$53.43$53.43819,300
2017-07-06$53.22$53.221,651,100
2017-07-05$54.76$54.761,256,000
2017-07-03$52.22$52.22490,100
2017-06-30$50.87$50.871,250,500
2017-06-29$51.80$51.801,375,900
2017-06-28$53.93$53.93927,400
2017-06-27$52.49$52.491,040,900
2017-06-26$55.50$55.50889,200
2017-06-23$54.97$54.971,146,300
2017-06-22$54.72$54.721,028,600
2017-06-21$54.20$54.201,135,600
2017-06-20$52.15$52.151,446,800
2017-06-19$52.13$52.131,123,700
2017-06-16$49.68$49.682,262,200
2017-06-15$50.25$50.25862,900
2017-06-14$50.80$50.80770,000
2017-06-13$50.54$50.54868,500
2017-06-12$49.86$49.861,180,200
2017-06-09$49.88$49.881,326,200
2017-06-08$49.98$49.981,197,800
2017-06-07$48.36$48.36915,100
2017-06-06$48.31$48.31883,700
2017-06-05$48.53$48.53792,500
2017-06-02$49.36$49.361,278,200
2017-06-01$48.23$48.231,648,400
2017-05-31$45.79$45.791,142,800
2017-05-30$44.98$44.98828,600
2017-05-26$46.38$46.381,170,300
2017-05-25$46.35$46.35986,800
2017-05-24$46.55$46.551,327,300
2017-05-23$45.14$45.141,454,800
2017-05-22$44.76$44.761,296,300
2017-05-19$43.55$43.551,759,500
2017-05-18$42.24$42.241,773,700
2017-05-17$43.16$43.161,581,900
2017-05-16$44.94$44.942,410,800
2017-05-15$43.90$43.907,029,800
2017-05-12$47.08$47.081,739,400
2017-05-11$44.92$44.921,377,900
2017-05-10$44.10$44.104,850,100
2017-05-09$46.80$46.801,582,600
2017-05-08$45.30$45.301,621,700
2017-05-05$47.72$47.72820,400
2017-05-04$47.88$47.88793,200
2017-05-03$47.97$47.97752,200
2017-05-02$47.44$47.441,109,200
2017-05-01$48.72$48.72877,800
2017-04-28$48.19$48.191,223,800
2017-04-27$47.56$47.561,031,300
2017-04-26$46.96$46.961,627,000
2017-04-25$47.88$47.882,707,300
2017-04-24$45.74$45.741,617,700
2017-04-21$44.26$44.262,123,400
2017-04-20$42.91$42.91975,300
2017-04-19$41.87$41.871,084,100
2017-04-18$42.34$42.34916,400
2017-04-17$42.16$42.16976,200
2017-04-13$42.27$42.271,738,300
2017-04-12$39.35$39.35712,800
2017-04-11$39.14$39.14853,700
2017-04-10$38.71$38.71817,200
2017-04-07$38.85$38.85809,600
2017-04-06$37.96$37.961,282,000
2017-04-05$37.91$37.911,141,800
2017-04-04$38.92$38.92989,900
2017-04-03$38.45$38.451,367,000
2017-03-31$40.20$40.20972,200
2017-03-30$40.41$40.411,576,800
2017-03-29$38.59$38.59659,300
2017-03-28$38.85$38.851,378,000
2017-03-27$39.89$39.891,357,500
2017-03-24$38.98$38.981,502,200
2017-03-23$37.93$37.931,778,600
2017-03-22$38.14$38.141,296,400
2017-03-21$38.24$38.241,883,700
2017-03-20$40.07$40.071,746,700
2017-03-17$40.22$40.223,114,500
2017-03-16$41.72$41.722,337,100
2017-03-15$41.47$41.471,275,400
2017-03-14$40.57$40.571,395,100
2017-03-13$41.74$41.742,261,000
2017-03-10$41.84$41.847,799,800
2017-03-09$45.80$45.801,871,200
2017-03-08$47.13$47.132,531,200
2017-03-07$46.51$46.512,611,800
2017-03-06$50.18$50.183,344,900
2017-03-03$54.70$54.703,445,500
2017-03-02$53.56$53.564,056,100
2017-03-01$49.44$49.441,966,400
2017-02-28$49.77$49.773,618,500
2017-02-27$46.90$46.901,956,800
2017-02-24$44.59$44.591,178,200
2017-02-23$44.35$44.351,169,100
2017-02-22$45.67$45.67878,500
2017-02-21$46.20$46.20839,700
2017-02-17$46.94$46.94612,100
2017-02-16$46.79$46.791,545,000
2017-02-15$46.97$46.971,194,800
2017-02-14$46.99$46.991,004,300
2017-02-13$46.09$46.09775,400
2017-02-10$45.42$45.42758,800
2017-02-09$46.08$46.081,342,600
2017-02-08$45.28$45.281,256,400
2017-02-07$44.82$44.821,059,000
2017-02-06$46.67$46.671,198,600
2017-02-03$46.42$46.421,426,500
2017-02-02$44.44$44.44976,700
2017-02-01$44.39$44.391,553,900
2017-01-31$44.50$44.501,853,400
2017-01-30$41.81$41.811,112,800
2017-01-27$42.41$42.41936,000
2017-01-26$41.86$41.861,948,400
2017-01-25$42.90$42.901,528,800
2017-01-24$42.36$42.362,908,500
2017-01-23$43.94$43.943,356,200
2017-01-20$46.97$46.971,614,000
2017-01-19$46.70$46.70899,300
2017-01-18$47.14$47.141,525,100
2017-01-17$46.62$46.622,457,600
2017-01-13$48.09$48.091,713,900
2017-01-12$49.54$49.541,567,100
2017-01-11$48.92$48.923,594,400
2017-01-10$50.07$50.071,863,000
2017-01-09$48.14$48.142,050,700
2017-01-06$47.83$47.833,104,600
2017-01-05$47.09$47.093,534,900
2017-01-04$49.34$49.341,955,900
2017-01-03$47.34$47.341,881,000