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 — 2023

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2023-12-29$50.59$50.591,104,400——
2023-12-28$50.50$50.501,134,700——
2023-12-27$50.16$50.16944,000——
2023-12-26$51.30$51.30779,000——
2023-12-22$51.19$51.191,545,500——
2023-12-21$49.11$49.11837,400——
2023-12-20$48.33$48.331,308,900——
2023-12-19$50.31$50.311,287,300——
2023-12-18$50.71$50.71985,500——
2023-12-15$49.70$49.701,958,000——
2023-12-14$49.82$49.821,576,600——
2023-12-13$49.13$49.131,649,300——
2023-12-12$49.46$49.46970,900——
2023-12-11$49.18$49.18772,300——
2023-12-08$48.69$48.69742,000——
2023-12-07$49.47$49.47715,900——
2023-12-06$49.94$49.941,191,300——
2023-12-05$50.00$50.001,567,300——
2023-12-04$51.46$51.461,080,500——
2023-12-01$51.63$51.631,656,700——
2023-11-30$49.47$49.471,184,600——
2023-11-29$49.41$49.411,133,000——
2023-11-28$48.34$48.34835,400——
2023-11-27$49.70$49.70764,900——
2023-11-24$49.83$49.83240,100——
2023-11-22$49.58$49.58440,900——
2023-11-21$49.04$49.04592,200——
2023-11-20$49.67$49.67761,900——
2023-11-17$48.97$48.971,185,500——
2023-11-16$48.54$48.54902,000——
2023-11-15$49.77$49.771,784,900——
2023-11-14$49.15$49.151,480,300——
2023-11-13$47.04$47.04770,600——
2023-11-10$46.36$46.361,060,000——
2023-11-09$47.31$47.311,347,700——
2023-11-08$47.09$47.091,179,600——
2023-11-07$47.71$47.711,085,500——
2023-11-06$46.29$46.291,160,300——
2023-11-03$47.19$47.191,692,400——
2023-11-02$43.73$43.731,146,000——
2023-11-01$45.26$45.261,087,500——
2023-10-31$44.27$44.27782,200——
2023-10-30$44.00$44.00595,700——
2023-10-27$44.05$44.05809,900——
2023-10-26$45.63$45.63810,600——
2023-10-25$44.37$44.37986,700——
2023-10-24$46.28$46.28755,100——
2023-10-23$45.79$45.791,170,500——
2023-10-20$46.16$46.161,189,100——
2023-10-19$46.56$46.561,283,700——
2023-10-18$45.98$45.981,737,600——
2023-10-17$48.51$48.511,123,000——
2023-10-16$48.14$48.141,089,300——
2023-10-13$47.98$47.981,345,300——
2023-10-12$46.10$46.10856,500——
2023-10-11$46.91$46.91646,200——
2023-10-10$46.65$46.65776,300——
2023-10-09$46.44$46.44870,900——
2023-10-06$46.39$46.391,082,300——
2023-10-05$46.85$46.851,735,500——
2023-10-04$43.67$43.671,465,900——
2023-10-03$43.39$43.391,287,300——
2023-10-02$43.43$43.431,730,000——
2023-09-29$45.36$45.361,339,100——
2023-09-28$46.26$46.261,972,700——
2023-09-27$47.13$47.132,202,200——
2023-09-26$46.28$46.282,684,400——
2023-09-25$42.66$42.66714,400——
2023-09-22$42.71$42.71704,500——
2023-09-21$42.48$42.48527,400——
2023-09-20$42.54$42.541,117,600——
2023-09-19$42.98$42.98645,700——
2023-09-18$42.93$42.93973,700——
2023-09-15$42.91$42.911,376,300——
2023-09-14$43.64$43.641,404,400——
2023-09-13$43.15$43.15987,600——
2023-09-12$43.51$43.511,250,400——
2023-09-11$41.29$41.29759,400——
2023-09-08$41.21$41.211,056,400——
2023-09-07$40.38$40.38553,800——
2023-09-06$39.79$39.79661,700——
2023-09-05$39.34$39.341,060,800——
2023-09-01$40.50$40.50441,800——
2023-08-31$40.27$40.27666,500——
2023-08-30$40.57$40.57587,800——
2023-08-29$41.06$41.06483,500——
2023-08-28$40.86$40.86457,100——
2023-08-25$40.32$40.32462,500——
2023-08-24$39.81$39.81496,000——
2023-08-23$39.72$39.72861,200——
2023-08-22$39.32$39.32938,000——
2023-08-21$39.20$39.20408,200——
2023-08-18$38.85$38.85669,500——
2023-08-17$39.13$39.13958,600——
2023-08-16$39.55$39.55562,300——
2023-08-15$40.00$40.00842,900——
2023-08-14$39.88$39.88597,000——
2023-08-11$40.22$40.22542,600——
2023-08-10$39.82$39.82781,200——
2023-08-09$39.99$39.991,071,000——
2023-08-08$39.55$39.55807,500——
2023-08-07$39.12$39.12846,400——
2023-08-04$39.74$39.74600,700——
2023-08-03$39.42$39.42701,500——
2023-08-02$40.41$40.41721,100——
2023-08-01$41.21$41.21985,400——
2023-07-31$41.43$41.431,619,800——
2023-07-28$39.79$39.791,424,000——
2023-07-27$38.50$38.501,093,000——
2023-07-26$38.98$38.98867,100——
2023-07-25$39.85$39.851,714,800——
2023-07-24$39.24$39.24976,900——
2023-07-21$40.65$40.652,077,100——
2023-07-20$40.96$40.961,183,000——
2023-07-19$42.03$42.031,093,200——
2023-07-18$42.08$42.081,017,800——
2023-07-17$42.20$42.201,582,400——
2023-07-14$42.48$42.48641,100——
2023-07-13$42.66$42.661,258,800——
2023-07-12$42.52$42.521,184,800——
2023-07-11$42.10$42.10618,700——
2023-07-10$41.78$41.781,139,700——
2023-07-07$41.78$41.78871,000——
2023-07-06$41.76$41.76902,100——
2023-07-05$42.19$42.19617,900——
2023-07-03$41.08$41.08419,800——
2023-06-30$41.03$41.03769,700——
2023-06-29$41.11$41.111,314,700——
2023-06-28$40.85$40.851,355,600——
2023-06-27$39.36$39.36850,500——
2023-06-26$39.10$39.10911,000——
2023-06-23$39.64$39.641,377,200——
2023-06-22$41.20$41.201,338,900——
2023-06-21$41.27$41.271,434,300——
2023-06-20$41.07$41.071,388,300——
2023-06-16$41.02$41.021,168,700——
2023-06-15$41.69$41.691,320,500——
2023-06-14$40.82$40.821,193,300——
2023-06-13$41.89$41.891,323,100——
2023-06-12$41.63$41.63961,900——
2023-06-09$40.65$40.651,453,900——
2023-06-08$41.65$41.656,509,900——
2023-06-07$40.55$40.555,552,000——
2023-06-06$43.33$43.33856,200——
2023-06-05$42.26$42.26882,700——
2023-06-02$41.75$41.75959,000——
2023-06-01$42.94$42.941,509,500——
2023-05-31$40.90$40.901,245,700——
2023-05-30$40.55$40.551,332,300——
2023-05-26$40.74$40.741,059,700——
2023-05-25$39.17$39.171,657,100——
2023-05-24$41.28$41.281,480,900——
2023-05-23$42.28$42.282,114,000——
2023-05-22$40.71$40.711,580,200——
2023-05-19$39.19$39.191,855,100——
2023-05-18$36.63$36.631,211,900——
2023-05-17$36.30$36.301,050,800——
2023-05-16$35.99$35.99991,000——
2023-05-15$36.24$36.24797,300——
2023-05-12$35.51$35.51575,500——
2023-05-11$35.59$35.59656,500——
2023-05-10$35.83$35.83844,000——
2023-05-09$35.70$35.70905,600——
2023-05-08$35.18$35.18880,600——
2023-05-05$36.20$36.20809,900——
2023-05-04$35.98$35.98996,600——
2023-05-03$34.73$34.731,419,100——
2023-05-02$35.52$35.52912,900——
2023-05-01$35.68$35.68760,600——
2023-04-28$35.37$35.37727,800——
2023-04-27$35.25$35.25975,900——
2023-04-26$35.75$35.75942,700——
2023-04-25$35.88$35.881,004,400——
2023-04-24$35.72$35.72941,900——
2023-04-21$36.93$36.93769,100——
2023-04-20$36.13$36.13892,000——
2023-04-19$36.73$36.73760,600——
2023-04-18$36.38$36.381,018,100——
2023-04-17$37.78$37.781,017,600——
2023-04-14$37.00$37.00750,800——
2023-04-13$37.56$37.56950,200——
2023-04-12$36.59$36.59633,900——
2023-04-11$37.23$37.23638,400——
2023-04-10$36.91$36.91980,300——
2023-04-06$37.27$37.27921,900——
2023-04-05$36.59$36.591,193,900——
2023-04-04$35.35$35.351,110,900——
2023-04-03$35.35$35.35732,600——
2023-03-31$35.74$35.741,091,900——
2023-03-30$34.89$34.89649,300——
2023-03-29$35.48$35.48880,300——
2023-03-28$34.29$34.29894,400——
2023-03-27$33.72$33.721,101,300——
2023-03-24$33.95$33.95827,200——
2023-03-23$33.62$33.621,556,100——
2023-03-22$35.29$35.291,320,400——
2023-03-21$35.62$35.621,077,300——
2023-03-20$35.60$35.601,173,500——
2023-03-17$35.18$35.181,446,400——
2023-03-16$35.00$35.00839,200——
2023-03-15$34.19$34.19998,800——
2023-03-14$33.76$33.76969,500——
2023-03-13$33.58$33.58841,400——
2023-03-10$33.96$33.96765,400——
2023-03-09$34.76$34.76996,800——
2023-03-08$35.63$35.63630,600——
2023-03-07$35.66$35.66487,500——
2023-03-06$36.25$36.25543,900——
2023-03-03$36.60$36.60616,000——
2023-03-02$35.81$35.81926,500——
2023-03-01$35.95$35.95575,400——
2023-02-28$35.90$35.901,212,000——
2023-02-27$36.21$36.21699,600——
2023-02-24$35.69$35.691,129,600——
2023-02-23$36.69$36.691,312,100——
2023-02-22$36.80$36.801,449,000——
2023-02-21$38.23$38.231,009,300——
2023-02-17$38.60$38.60761,400——
2023-02-16$38.11$38.11665,400——
2023-02-15$38.58$38.58728,100——
2023-02-14$39.21$39.21414,800——
2023-02-13$39.67$39.67522,800——
2023-02-10$39.00$39.00621,700——
2023-02-09$39.36$39.36676,000——
2023-02-08$39.32$39.32935,700——
2023-02-07$40.97$40.97584,600——
2023-02-06$40.50$40.50481,200——
2023-02-03$40.92$40.92593,500——
2023-02-02$41.20$41.201,023,200——
2023-02-01$40.03$40.03760,800——
2023-01-31$39.87$39.87454,600——
2023-01-30$39.24$39.24670,600——
2023-01-27$40.02$40.02487,200——
2023-01-26$39.38$39.38730,300——
2023-01-25$39.75$39.75948,900——
2023-01-24$40.07$40.07617,000——
2023-01-23$39.42$39.421,020,100——
2023-01-20$40.76$40.761,796,800——
2023-01-19$40.58$40.581,090,700——
2023-01-18$39.82$39.821,578,900——
2023-01-17$39.80$39.80890,600——
2023-01-13$39.85$39.851,478,200——
2023-01-12$39.03$39.031,263,900——
2023-01-11$37.95$37.951,052,200——
2023-01-10$38.31$38.311,127,100——
2023-01-09$37.25$37.252,147,400——
2023-01-06$40.52$40.521,229,900——
2023-01-05$40.12$40.121,852,900——
2023-01-04$39.25$39.251,301,100——
2023-01-03$37.58$37.581,138,500——