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 — 2018

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2018-12-31$54.06$54.06955,400
2018-12-28$51.36$51.36950,100
2018-12-27$53.12$53.12940,200
2018-12-26$52.15$52.15727,300
2018-12-24$49.50$49.50557,800
2018-12-21$48.78$48.781,538,600
2018-12-20$49.78$49.78868,500
2018-12-19$50.86$50.86853,600
2018-12-18$51.27$51.27689,300
2018-12-17$51.87$51.871,119,100
2018-12-14$52.93$52.93634,900
2018-12-13$53.47$53.47902,600
2018-12-12$56.17$56.17988,700
2018-12-11$53.95$53.95692,000
2018-12-10$53.33$53.33884,000
2018-12-07$53.12$53.121,412,000
2018-12-06$56.05$56.051,071,900
2018-12-04$56.00$56.001,510,900
2018-12-03$59.54$59.54906,700
2018-11-30$58.29$58.29791,400
2018-11-29$57.43$57.43937,200
2018-11-28$57.96$57.96874,500
2018-11-27$55.44$55.44970,100
2018-11-26$56.26$56.26843,900
2018-11-23$54.15$54.15399,800
2018-11-21$53.76$53.76469,100
2018-11-20$53.29$53.29803,400
2018-11-19$53.62$53.62669,700
2018-11-16$53.74$53.74972,600
2018-11-15$51.67$51.67738,000
2018-11-14$50.06$50.061,371,000
2018-11-13$51.73$51.73948,900
2018-11-12$50.25$50.251,546,300
2018-11-09$51.50$51.501,136,800
2018-11-08$52.79$52.791,082,600
2018-11-07$54.32$54.321,258,800
2018-11-06$53.65$53.651,508,300
2018-11-05$51.52$51.521,716,400
2018-11-02$51.70$51.70873,500
2018-11-01$51.88$51.881,161,900
2018-10-31$49.55$49.55958,600
2018-10-30$49.06$49.061,076,500
2018-10-29$47.90$47.90750,500
2018-10-26$47.77$47.77954,500
2018-10-25$48.33$48.331,131,900
2018-10-24$46.01$46.011,374,100
2018-10-23$48.84$48.841,930,000
2018-10-22$46.70$46.701,052,200
2018-10-19$45.19$45.19837,500
2018-10-18$46.35$46.35534,600
2018-10-17$47.34$47.34708,900
2018-10-16$47.49$47.49873,600
2018-10-15$45.13$45.13749,900
2018-10-12$45.00$45.00911,700
2018-10-11$43.37$43.371,343,000
2018-10-10$44.06$44.061,460,600
2018-10-09$44.89$44.891,650,900
2018-10-08$45.00$45.003,512,300
2018-10-05$48.73$48.73818,900
2018-10-04$47.48$47.481,202,700
2018-10-03$47.99$47.991,372,500
2018-10-02$48.55$48.551,094,100
2018-10-01$50.06$50.06865,000
2018-09-28$51.58$51.58942,700
2018-09-27$51.73$51.73718,600
2018-09-26$51.39$51.39864,700
2018-09-25$51.52$51.522,152,400
2018-09-24$50.51$50.511,002,900
2018-09-21$49.14$49.141,728,000
2018-09-20$50.80$50.80702,000
2018-09-19$49.98$49.98653,400
2018-09-18$49.36$49.361,481,400
2018-09-17$48.19$48.191,762,000
2018-09-14$46.00$46.00844,900
2018-09-13$45.09$45.09964,800
2018-09-12$45.04$45.04869,200
2018-09-11$44.65$44.65630,700
2018-09-10$44.55$44.55932,700
2018-09-07$44.18$44.18775,500
2018-09-06$44.46$44.461,020,400
2018-09-05$45.06$45.06876,200
2018-09-04$45.76$45.761,448,200
2018-08-31$45.69$45.69556,800
2018-08-30$46.43$46.43908,300
2018-08-29$46.19$46.191,817,000
2018-08-28$45.17$45.176,119,200
2018-08-27$53.70$53.702,671,900
2018-08-24$49.80$49.802,031,400
2018-08-23$51.21$51.211,199,800
2018-08-22$52.68$52.681,030,500
2018-08-21$53.25$53.251,048,100
2018-08-20$51.67$51.67830,700
2018-08-17$50.84$50.84712,600
2018-08-16$51.42$51.42794,600
2018-08-15$49.65$49.65960,400
2018-08-14$51.02$51.021,065,600
2018-08-13$50.01$50.011,226,600
2018-08-10$48.70$48.702,341,600
2018-08-09$48.21$48.211,239,700
2018-08-08$45.57$45.571,543,000
2018-08-07$44.20$44.201,407,300
2018-08-06$43.65$43.65600,900
2018-08-03$43.62$43.62524,000
2018-08-02$44.44$44.44691,600
2018-08-01$43.09$43.09719,500
2018-07-31$43.68$43.68932,900
2018-07-30$43.69$43.69741,600
2018-07-27$45.04$45.04793,200
2018-07-26$46.01$46.01588,700
2018-07-25$45.49$45.49720,800
2018-07-24$45.32$45.321,292,500
2018-07-23$44.56$44.56777,200
2018-07-20$46.50$46.50928,900
2018-07-19$45.84$45.84745,500
2018-07-18$44.79$44.79479,400
2018-07-17$44.11$44.11548,000
2018-07-16$44.27$44.27581,300
2018-07-13$45.24$45.24550,100
2018-07-12$45.59$45.59687,300
2018-07-11$45.17$45.17755,300
2018-07-10$44.95$44.95717,700
2018-07-09$45.20$45.20906,100
2018-07-06$45.53$45.53968,500
2018-07-05$43.44$43.44450,200
2018-07-03$43.44$43.44297,600
2018-07-02$42.88$42.88524,500
2018-06-29$41.67$41.67960,100
2018-06-28$41.98$41.98843,600
2018-06-27$42.00$42.00762,900
2018-06-26$43.46$43.46933,400
2018-06-25$42.17$42.171,456,500
2018-06-22$42.95$42.951,062,800
2018-06-21$42.17$42.171,100,600
2018-06-20$44.03$44.031,446,200
2018-06-19$43.43$43.431,140,300
2018-06-18$43.61$43.613,387,200
2018-06-15$46.57$46.571,341,100
2018-06-14$47.35$47.35851,900
2018-06-13$46.86$46.86627,000
2018-06-12$47.15$47.15738,500
2018-06-11$45.87$45.87872,300
2018-06-08$44.68$44.68880,700
2018-06-07$45.98$45.98720,700
2018-06-06$46.62$46.62572,700
2018-06-05$46.14$46.14611,700
2018-06-04$46.76$46.76541,000
2018-06-01$46.61$46.61911,000
2018-05-31$46.65$46.651,255,900
2018-05-30$47.05$47.05674,200
2018-05-29$46.08$46.081,093,000
2018-05-25$44.85$44.85515,000
2018-05-24$45.23$45.23709,800
2018-05-23$44.09$44.09536,500
2018-05-22$43.80$43.80596,900
2018-05-21$43.23$43.23777,900
2018-05-18$44.64$44.641,117,900
2018-05-17$43.83$43.831,079,800
2018-05-16$43.71$43.711,184,500
2018-05-15$44.39$44.391,141,600
2018-05-14$46.38$46.381,496,000
2018-05-11$45.95$45.951,619,400
2018-05-10$42.80$42.801,400
2018-05-09$42.80$42.801,387,900
2018-05-08$40.53$40.535,628,500
2018-05-07$44.33$44.331,460,800
2018-05-04$44.01$44.012,031,300
2018-05-03$41.27$41.271,266,700
2018-05-02$42.74$42.741,439,500
2018-05-01$42.63$42.631,208,500
2018-04-30$43.03$43.031,593,200
2018-04-27$45.06$45.061,042,300
2018-04-26$43.48$43.481,136,000
2018-04-25$43.98$43.981,024,500
2018-04-24$45.33$45.333,218,900
2018-04-23$50.70$50.702,625,200
2018-04-20$48.51$48.514,732,500
2018-04-19$45.85$45.851,378,700
2018-04-18$46.03$46.031,405,700
2018-04-17$44.49$44.49619,900
2018-04-16$43.47$43.47537,900
2018-04-13$43.62$43.62524,600
2018-04-12$43.82$43.82964,900
2018-04-11$43.55$43.551,322,000
2018-04-10$43.60$43.601,196,800
2018-04-09$41.61$41.61973,400
2018-04-06$40.68$40.68978,700
2018-04-05$42.54$42.54771,300
2018-04-04$43.00$43.001,098,600
2018-04-03$42.00$42.001,148,400
2018-04-02$42.12$42.121,586,400
2018-03-29$44.08$44.082,397,900
2018-03-28$45.93$45.931,254,100
2018-03-27$45.80$45.801,556,500
2018-03-26$48.99$48.991,554,800
2018-03-23$47.74$47.741,015,100
2018-03-22$50.78$50.78760,100
2018-03-21$51.90$51.90527,700
2018-03-20$51.12$51.12635,400
2018-03-19$52.61$52.61973,600
2018-03-16$51.69$51.69877,000
2018-03-15$52.18$52.182,059,500
2018-03-14$53.57$53.57725,500
2018-03-13$55.05$55.051,271,700
2018-03-12$54.78$54.781,081,200
2018-03-09$52.98$52.98770,400
2018-03-08$52.28$52.28629,600
2018-03-07$53.31$53.311,366,200
2018-03-06$51.63$51.631,153,500
2018-03-05$49.93$49.931,070,300
2018-03-02$48.94$48.941,677,800
2018-03-01$49.89$49.891,818,400
2018-02-28$52.82$52.821,426,800
2018-02-27$51.47$51.471,593,200
2018-02-26$51.37$51.37537,400
2018-02-23$51.03$51.03547,400
2018-02-22$49.88$49.88789,200
2018-02-21$49.86$49.86611,200
2018-02-20$49.99$49.99628,700
2018-02-16$50.05$50.05497,100
2018-02-15$49.78$49.78710,000
2018-02-14$48.34$48.34551,900
2018-02-13$47.59$47.591,068,900
2018-02-12$46.53$46.531,296,400
2018-02-09$46.75$46.751,894,400
2018-02-08$47.47$47.47935,200
2018-02-07$50.26$50.26734,200
2018-02-06$50.92$50.921,116,000
2018-02-05$48.61$48.611,125,800
2018-02-02$51.11$51.11721,800
2018-02-01$52.69$52.69612,100
2018-01-31$52.52$52.52681,100
2018-01-30$52.76$52.76837,900
2018-01-29$52.96$52.961,727,200
2018-01-26$52.95$52.95781,300
2018-01-25$52.37$52.371,558,600
2018-01-24$53.34$53.341,181,200
2018-01-23$51.82$51.821,021,500
2018-01-22$51.70$51.70801,700
2018-01-19$50.22$50.221,164,500
2018-01-18$49.69$49.69748,400
2018-01-17$51.61$51.61621,100
2018-01-16$51.05$51.051,159,400
2018-01-12$53.22$53.22946,400
2018-01-11$53.17$53.17759,700
2018-01-10$53.75$53.751,033,200
2018-01-09$53.85$53.851,188,200
2018-01-08$51.66$51.661,458,000
2018-01-05$49.89$49.891,065,400
2018-01-04$49.48$49.481,067,600
2018-01-03$50.02$50.02928,500
2018-01-02$49.25$49.251,154,700