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 — 2015

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2015-12-31$61.93$61.93722,800
2015-12-30$61.32$61.32581,700
2015-12-29$60.89$60.89636,000
2015-12-28$60.54$60.54868,300
2015-12-24$59.64$59.64538,500
2015-12-23$58.62$58.62769,800
2015-12-22$57.85$57.85521,500
2015-12-21$57.56$57.56995,200
2015-12-18$57.84$57.841,770,000
2015-12-17$58.20$58.201,169,900
2015-12-16$59.36$59.361,444,200
2015-12-15$56.42$56.421,052,900
2015-12-14$53.05$53.05996,400
2015-12-11$53.95$53.951,172,600
2015-12-10$57.67$57.671,055,200
2015-12-09$57.20$57.201,056,500
2015-12-08$59.10$59.101,480,900
2015-12-07$56.85$56.851,075,600
2015-12-04$59.61$59.611,290,900
2015-12-03$58.00$58.001,305,000
2015-12-02$60.70$60.701,549,400
2015-12-01$61.88$61.881,267,700
2015-11-30$61.04$61.041,301,200
2015-11-27$62.46$62.46325,200
2015-11-25$62.43$62.43631,100
2015-11-24$61.73$61.73732,000
2015-11-23$62.06$62.061,059,700
2015-11-20$61.24$61.24790,900
2015-11-19$61.77$61.771,258,800
2015-11-18$60.84$60.842,800,900
2015-11-17$61.32$61.321,427,500
2015-11-16$60.27$60.271,954,400
2015-11-13$62.65$62.651,171,200
2015-11-12$62.04$62.041,275,500
2015-11-11$62.35$62.352,247,600
2015-11-10$64.12$64.123,315,600
2015-11-09$62.77$62.775,825,000
2015-11-06$55.87$55.872,315,600
2015-11-05$53.95$53.952,324,000
2015-11-04$53.01$53.011,700,700
2015-11-03$51.27$51.271,930,200
2015-11-02$51.95$51.951,397,600
2015-10-30$48.15$48.151,493,500
2015-10-29$49.21$49.211,535,700
2015-10-28$51.04$51.041,907,500
2015-10-27$51.90$51.902,600,500
2015-10-26$46.61$46.611,488,700
2015-10-23$45.52$45.521,935,400
2015-10-22$42.98$42.982,231,000
2015-10-21$42.97$42.972,655,000
2015-10-20$41.33$41.331,363,000
2015-10-19$44.11$44.111,447,400
2015-10-16$44.62$44.621,702,600
2015-10-15$43.94$43.941,472,300
2015-10-14$40.79$40.791,355,700
2015-10-13$40.80$40.801,261,400
2015-10-12$42.20$42.201,048,300
2015-10-09$43.24$43.241,292,600
2015-10-08$42.38$42.381,407,500
2015-10-07$42.44$42.442,192,600
2015-10-06$40.17$40.171,827,500
2015-10-05$41.48$41.481,826,400
2015-10-02$43.32$43.322,142,800
2015-10-01$40.90$40.901,939,800
2015-09-30$40.42$40.422,684,700
2015-09-29$38.04$38.042,863,100
2015-09-28$40.32$40.323,125,500
2015-09-25$43.98$43.982,491,500
2015-09-24$45.89$45.892,062,700
2015-09-23$47.42$47.422,236,700
2015-09-22$48.23$48.232,150,200
2015-09-21$50.20$50.202,321,800
2015-09-18$54.56$54.561,748,900
2015-09-17$55.17$55.171,275,500
2015-09-16$54.54$54.541,508,700
2015-09-15$55.18$55.181,508,800
2015-09-14$54.39$54.391,429,200
2015-09-11$54.08$54.081,485,900
2015-09-10$53.01$53.011,474,200
2015-09-09$52.74$52.741,371,200
2015-09-08$54.24$54.241,189,700
2015-09-04$52.10$52.101,103,400
2015-09-03$51.57$51.572,034,100
2015-09-02$51.75$51.751,636,200
2015-09-01$48.75$48.752,163,700
2015-08-31$50.18$50.182,138,800
2015-08-28$51.54$51.541,531,900
2015-08-27$51.56$51.562,186,500
2015-08-26$49.02$49.021,877,500
2015-08-25$46.45$46.452,261,300
2015-08-24$44.15$44.152,573,900
2015-08-21$46.66$46.662,289,000
2015-08-20$46.58$46.581,715,500
2015-08-19$50.67$50.671,353,400
2015-08-18$51.33$51.331,187,600
2015-08-17$51.56$51.561,056,500
2015-08-14$50.00$50.001,544,100
2015-08-13$50.94$50.941,100,600
2015-08-12$52.05$52.051,767,900
2015-08-11$50.51$50.511,597,000
2015-08-10$50.51$50.511,682,800
2015-08-07$49.74$49.742,652,600
2015-08-06$50.74$50.742,265,500
2015-08-05$54.52$54.521,883,500
2015-08-04$55.30$55.301,951,900
2015-08-03$53.96$53.961,534,400
2015-07-31$54.93$54.931,589,200
2015-07-30$53.17$53.171,181,200
2015-07-29$53.05$53.051,854,700
2015-07-28$54.40$54.401,555,900
2015-07-27$53.68$53.682,102,300
2015-07-24$53.15$53.151,577,800
2015-07-23$55.08$55.081,399,600
2015-07-22$55.38$55.38942,500
2015-07-21$56.18$56.181,777,300
2015-07-20$55.68$55.681,345,500
2015-07-17$57.23$57.232,404,100
2015-07-16$57.08$57.082,219,900
2015-07-15$55.32$55.322,527,800
2015-07-14$56.20$56.202,542,000
2015-07-13$53.69$53.692,014,400
2015-07-10$53.50$53.501,842,700
2015-07-09$53.08$53.082,677,600
2015-07-08$53.15$53.151,903,400
2015-07-07$55.36$55.362,259,800
2015-07-06$55.43$55.432,563,000
2015-07-02$56.13$56.131,521,900
2015-07-01$57.16$57.162,138,500
2015-06-30$57.55$57.552,945,500
2015-06-29$56.05$56.053,444,500
2015-06-26$58.89$58.8915,947,500
2015-06-25$61.99$61.991,421,500
2015-06-24$62.04$62.041,860,300
2015-06-23$63.96$63.961,416,500
2015-06-22$64.64$64.641,535,500
2015-06-19$62.55$62.551,853,700
2015-06-18$63.09$63.091,785,100
2015-06-17$61.46$61.461,712,300
2015-06-16$62.18$62.181,958,600
2015-06-15$62.45$62.452,774,100
2015-06-12$64.96$64.962,780,300
2015-06-11$68.00$68.006,075,300
2015-06-10$66.60$66.602,284,700
2015-06-09$65.79$65.791,452,900
2015-06-08$66.94$66.941,978,600
2015-06-05$66.15$66.152,096,900
2015-06-04$64.33$64.332,208,100
2015-06-03$66.45$66.452,124,800
2015-06-02$66.30$66.301,805,900
2015-06-01$66.94$66.941,423,700
2015-05-29$67.32$67.321,774,500
2015-05-28$66.71$66.711,537,000
2015-05-27$67.72$67.721,428,800
2015-05-26$66.99$66.991,237,600
2015-05-22$67.76$67.761,284,000
2015-05-21$67.17$67.171,934,800
2015-05-20$67.56$67.562,760,000
2015-05-19$64.21$64.211,620,400
2015-05-18$64.33$64.331,756,200
2015-05-15$62.55$62.551,347,600
2015-05-14$62.45$62.451,755,200
2015-05-13$60.84$60.841,552,900
2015-05-12$61.90$61.901,597,600
2015-05-11$62.12$62.121,458,900
2015-05-08$61.94$61.942,059,100
2015-05-07$60.43$60.432,434,800
2015-05-06$60.37$60.374,031,300
2015-05-05$58.34$58.344,697,100
2015-05-04$59.66$59.665,393,100
2015-05-01$58.24$58.242,535,900
2015-04-30$56.72$56.723,005,800
2015-04-29$59.31$59.312,416,200
2015-04-28$60.08$60.084,528,300
2015-04-27$62.02$62.023,418,100
2015-04-24$66.37$66.371,751,400
2015-04-23$67.75$67.751,455,700
2015-04-22$66.26$66.261,366,900
2015-04-21$66.29$66.292,175,300
2015-04-20$65.16$65.161,459,700
2015-04-17$65.33$65.332,064,800
2015-04-16$66.31$66.311,806,200
2015-04-15$65.34$65.341,643,500
2015-04-14$64.81$64.812,258,900
2015-04-13$66.58$66.581,949,100
2015-04-10$65.70$65.702,295,900
2015-04-09$64.06$64.062,743,800
2015-04-08$62.00$62.002,592,800
2015-04-07$61.48$61.482,217,800
2015-04-06$61.38$61.381,558,100
2015-04-02$61.63$61.631,989,200
2015-04-01$63.18$63.182,719,600
2015-03-31$63.67$63.673,149,800
2015-03-30$64.81$64.812,638,200
2015-03-27$63.37$63.374,336,100
2015-03-26$61.15$61.155,755,100
2015-03-25$62.39$62.395,379,900
2015-03-24$68.22$68.222,605,100
2015-03-23$69.23$69.234,021,400
2015-03-20$73.59$73.594,091,300
2015-03-19$77.08$77.084,114,400
2015-03-18$71.88$71.881,797,900
2015-03-17$72.09$72.091,773,700
2015-03-16$71.98$71.981,433,100
2015-03-13$70.66$70.661,591,800
2015-03-12$70.60$70.601,431,600
2015-03-11$68.91$68.911,559,400
2015-03-10$69.35$69.352,718,200
2015-03-09$69.96$69.962,386,200
2015-03-06$70.44$70.443,276,000
2015-03-05$71.76$71.763,758,800
2015-03-04$70.16$70.162,740,300
2015-03-03$68.66$68.662,596,600
2015-03-02$66.80$66.803,314,400
2015-02-27$68.56$68.567,527,900
2015-02-26$67.33$67.332,609,400
2015-02-25$68.15$68.152,152,800
2015-02-24$67.85$67.852,917,700
2015-02-23$66.14$66.142,701,300
2015-02-20$67.01$67.011,919,300
2015-02-19$65.35$65.351,536,000
2015-02-18$65.22$65.221,608,600
2015-02-17$63.43$63.431,893,800
2015-02-13$63.86$63.862,167,300
2015-02-12$64.30$64.303,233,700
2015-02-11$61.04$61.042,434,000
2015-02-10$61.29$61.292,996,200
2015-02-09$58.83$58.831,971,300
2015-02-06$59.01$59.013,583,100
2015-02-05$61.40$61.404,035,700
2015-02-04$59.72$59.727,367,400
2015-02-03$64.70$64.707,367,900
2015-02-02$68.67$68.672,711,600
2015-01-30$68.51$68.512,327,800
2015-01-29$69.86$69.862,372,200
2015-01-28$68.58$68.582,633,400
2015-01-27$72.40$72.401,665,400
2015-01-26$72.90$72.902,016,600
2015-01-23$71.28$71.281,495,800
2015-01-22$70.98$70.982,580,900
2015-01-21$69.72$69.723,990,300
2015-01-20$72.33$72.333,994,400
2015-01-16$69.37$69.374,924,400
2015-01-15$68.84$68.843,235,800
2015-01-14$72.29$72.293,146,700
2015-01-13$71.63$71.634,600,300
2015-01-12$73.34$73.342,833,100
2015-01-09$72.26$72.265,158,200
2015-01-08$71.93$71.935,872,100
2015-01-07$68.59$68.594,342,600
2015-01-06$65.44$65.445,874,800
2015-01-05$68.17$68.1710,331,300
2015-01-02$61.57$61.572,080,200