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 — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2021-12-31$30.43$30.43639,500——
2021-12-30$30.54$30.54628,400——
2021-12-29$30.63$30.63908,600——
2021-12-28$30.19$30.19836,400——
2021-12-27$31.19$31.19835,200——
2021-12-23$32.71$32.71493,700——
2021-12-22$32.33$32.33747,800——
2021-12-21$32.63$32.631,100,600——
2021-12-20$32.21$32.211,165,700——
2021-12-17$32.46$32.462,510,600——
2021-12-16$30.07$30.07807,900——
2021-12-15$31.11$31.111,100,100——
2021-12-14$30.25$30.251,866,600——
2021-12-13$30.17$30.172,249,000——
2021-12-10$29.47$29.471,063,900——
2021-12-09$30.28$30.282,589,100——
2021-12-08$32.21$32.211,647,800——
2021-12-07$30.57$30.572,150,000——
2021-12-06$27.50$27.501,132,900——
2021-12-03$26.39$26.391,756,000——
2021-12-02$26.15$26.151,350,600——
2021-12-01$25.61$25.611,441,900——
2021-11-30$26.50$26.502,092,300——
2021-11-29$27.45$27.451,635,500——
2021-11-26$29.05$29.05755,700——
2021-11-24$29.76$29.761,302,200——
2021-11-23$30.33$30.331,639,400——
2021-11-22$30.65$30.651,214,900——
2021-11-19$31.99$31.99927,500——
2021-11-18$32.14$32.14927,400——
2021-11-17$32.48$32.48935,900——
2021-11-16$32.67$32.67835,300——
2021-11-15$32.79$32.79630,000——
2021-11-12$32.69$32.69404,200——
2021-11-11$33.56$33.56588,400——
2021-11-10$33.30$33.30610,500——
2021-11-09$34.00$34.00477,600——
2021-11-08$34.88$34.88785,600——
2021-11-05$33.69$33.69929,400——
2021-11-04$34.63$34.63851,700——
2021-11-03$33.76$33.761,388,800——
2021-11-02$32.97$32.97935,500——
2021-11-01$33.00$33.00711,600——
2021-10-29$31.87$31.871,015,200——
2021-10-28$31.20$31.20796,000——
2021-10-27$29.81$29.811,018,500——
2021-10-26$29.84$29.84691,900——
2021-10-25$30.10$30.10478,400——
2021-10-22$30.44$30.44753,400——
2021-10-21$30.33$30.33721,500——
2021-10-20$30.52$30.521,323,100——
2021-10-19$31.28$31.281,965,100——
2021-10-18$30.25$30.255,316,600——
2021-10-15$35.10$35.101,811,800——
2021-10-14$34.49$34.49601,500——
2021-10-13$33.56$33.56435,200——
2021-10-12$34.01$34.01606,300——
2021-10-11$34.41$34.41570,500——
2021-10-08$34.09$34.09439,500——
2021-10-07$33.77$33.77650,100——
2021-10-06$33.34$33.34589,300——
2021-10-05$32.79$32.79798,900——
2021-10-04$32.33$32.33589,400——
2021-10-01$33.57$33.571,020,200——
2021-09-30$33.54$33.54581,300——
2021-09-29$33.58$33.58772,300——
2021-09-28$34.36$34.361,227,200——
2021-09-27$35.87$35.87790,200——
2021-09-24$36.20$36.20445,800——
2021-09-23$37.20$37.20875,800——
2021-09-22$36.56$36.56571,000——
2021-09-21$36.28$36.28916,100——
2021-09-20$36.19$36.19994,600——
2021-09-17$37.21$37.213,056,500——
2021-09-16$36.43$36.431,139,900——
2021-09-15$36.96$36.962,251,300——
2021-09-14$36.21$36.21685,700——
2021-09-13$36.27$36.271,179,000——
2021-09-10$36.09$36.09753,200——
2021-09-09$36.26$36.26542,200——
2021-09-08$36.97$36.97723,400——
2021-09-07$37.55$37.551,372,200——
2021-09-03$39.52$39.52603,700——
2021-09-02$40.55$40.55503,900——
2021-09-01$40.28$40.28655,600——
2021-08-31$39.76$39.76929,700——
2021-08-30$39.14$39.14626,400——
2021-08-27$39.63$39.63760,600——
2021-08-26$38.90$38.90506,100——
2021-08-25$39.54$39.54644,000——
2021-08-24$39.98$39.98544,600——
2021-08-23$39.03$39.03722,200——
2021-08-20$39.26$39.26747,100——
2021-08-19$37.84$37.84918,900——
2021-08-18$38.03$38.03594,400——
2021-08-17$38.76$38.76791,000——
2021-08-16$38.63$38.63799,900——
2021-08-13$39.68$39.68620,000——
2021-08-12$39.31$39.31438,100——
2021-08-11$38.21$38.21775,300——
2021-08-10$38.85$38.85729,900——
2021-08-09$38.56$38.56535,800——
2021-08-06$38.80$38.80763,800——
2021-08-05$39.38$39.38994,300——
2021-08-04$37.81$37.81809,100——
2021-08-03$37.81$37.81622,200——
2021-08-02$37.63$37.63569,200——
2021-07-30$37.14$37.14996,400——
2021-07-29$36.68$36.68927,800——
2021-07-28$37.73$37.73876,100——
2021-07-27$36.37$36.37962,800——
2021-07-26$37.42$37.421,180,300——
2021-07-23$38.03$38.03949,200——
2021-07-22$37.49$37.49881,300——
2021-07-21$36.71$36.71789,000——
2021-07-20$36.65$36.651,018,600——
2021-07-19$35.56$35.56897,500——
2021-07-16$36.55$36.552,214,100——
2021-07-15$35.67$35.671,058,700——
2021-07-14$35.26$35.26878,000——
2021-07-13$36.36$36.36996,700——
2021-07-12$37.29$37.29963,800——
2021-07-09$38.87$38.87649,700——
2021-07-08$38.79$38.791,018,000——
2021-07-07$38.96$38.96872,000——
2021-07-06$39.33$39.331,329,900——
2021-07-02$39.92$39.921,386,200——
2021-07-01$40.05$40.051,076,000——
2021-06-30$39.89$39.891,586,400——
2021-06-29$39.55$39.551,719,000——
2021-06-28$38.97$38.971,908,500——
2021-06-25$38.93$38.932,658,700——
2021-06-24$38.44$38.441,476,200——
2021-06-23$37.78$37.78968,700——
2021-06-22$37.69$37.691,093,600——
2021-06-21$36.91$36.911,206,500——
2021-06-18$37.79$37.792,251,400——
2021-06-17$37.48$37.48741,500——
2021-06-16$37.13$37.131,044,100——
2021-06-15$36.68$36.681,597,600——
2021-06-14$37.79$37.79838,700——
2021-06-11$37.93$37.931,393,700——
2021-06-10$38.21$38.212,579,800——
2021-06-09$36.92$36.922,026,200——
2021-06-08$36.89$36.891,854,900——
2021-06-07$35.87$35.873,206,200——
2021-06-04$34.54$34.54918,900——
2021-06-03$34.72$34.721,348,400——
2021-06-02$35.68$35.681,978,500——
2021-06-01$36.74$36.741,135,600——
2021-05-28$37.25$37.251,475,200——
2021-05-27$36.85$36.859,313,800——
2021-05-26$35.52$35.521,958,800——
2021-05-25$35.28$35.282,015,000——
2021-05-24$35.43$35.431,572,400——
2021-05-21$36.21$36.21989,800——
2021-05-20$36.56$36.561,391,900——
2021-05-19$35.36$35.362,093,000——
2021-05-18$36.87$36.871,879,800——
2021-05-17$37.32$37.321,657,700——
2021-05-14$38.24$38.242,259,900——
2021-05-13$37.37$37.372,152,200——
2021-05-12$37.31$37.312,450,400——
2021-05-11$36.69$36.691,777,700——
2021-05-10$36.24$36.241,942,600——
2021-05-07$36.54$36.542,696,000——
2021-05-06$37.33$37.334,031,600——
2021-05-05$39.89$39.893,205,200——
2021-05-04$41.98$41.981,791,500——
2021-05-03$42.99$42.991,743,400——
2021-04-30$42.82$42.821,048,300——
2021-04-29$43.32$43.32996,900——
2021-04-28$43.56$43.561,269,800——
2021-04-27$43.34$43.341,019,800——
2021-04-26$43.63$43.631,656,400——
2021-04-23$42.69$42.69754,500——
2021-04-22$42.46$42.461,486,100——
2021-04-21$41.49$41.491,612,500——
2021-04-20$41.16$41.161,120,300——
2021-04-19$39.94$39.941,368,400——
2021-04-16$40.78$40.781,860,300——
2021-04-15$41.03$41.031,159,100——
2021-04-14$41.83$41.83841,000——
2021-04-13$41.09$41.091,119,900——
2021-04-12$40.87$40.871,395,600——
2021-04-09$42.36$42.362,121,100——
2021-04-08$42.69$42.693,706,500——
2021-04-07$43.65$43.653,716,500——
2021-04-06$47.25$47.251,272,600——
2021-04-05$46.84$46.84989,100——
2021-04-01$45.05$45.051,092,100——
2021-03-31$44.96$44.96925,100——
2021-03-30$44.71$44.711,007,900——
2021-03-29$44.96$44.962,470,200——
2021-03-26$42.95$42.951,455,000——
2021-03-25$42.51$42.511,423,200——
2021-03-24$43.28$43.283,432,000——
2021-03-23$43.59$43.598,507,300——
2021-03-22$55.64$55.641,338,200——
2021-03-19$54.21$54.211,758,900——
2021-03-18$52.80$52.80709,900——
2021-03-17$53.35$53.35838,600——
2021-03-16$54.30$54.301,090,000——
2021-03-15$54.62$54.62544,400——
2021-03-12$52.99$52.99829,900——
2021-03-11$53.40$53.40652,400——
2021-03-10$51.78$51.781,032,300——
2021-03-09$52.22$52.22603,100——
2021-03-08$51.19$51.19841,400——
2021-03-05$52.78$52.78918,700——
2021-03-04$51.27$51.27934,000——
2021-03-03$52.82$52.82749,300——
2021-03-02$55.30$55.301,412,200——
2021-03-01$54.05$54.05871,600——
2021-02-26$52.40$52.401,230,600——
2021-02-25$53.41$53.411,155,300——
2021-02-24$56.21$56.21704,100——
2021-02-23$56.05$56.05734,900——
2021-02-22$55.94$55.94725,000——
2021-02-19$57.69$57.69519,300——
2021-02-18$57.53$57.53941,700——
2021-02-17$58.30$58.301,130,600——
2021-02-16$56.20$56.201,010,200——
2021-02-12$57.06$57.06681,900——
2021-02-11$57.95$57.95665,400——
2021-02-10$58.09$58.09936,200——
2021-02-09$59.33$59.33531,900——
2021-02-08$59.73$59.73953,300——
2021-02-05$60.19$60.19803,200——
2021-02-04$59.41$59.41928,200——
2021-02-03$61.24$61.24914,400——
2021-02-02$61.22$61.221,264,600——
2021-02-01$58.97$58.97660,400——
2021-01-29$60.07$60.07947,300——
2021-01-28$60.69$60.691,008,200——
2021-01-27$59.19$59.191,091,800——
2021-01-26$62.52$62.52856,900——
2021-01-25$63.78$63.781,113,100——
2021-01-22$61.75$61.75651,700——
2021-01-21$61.27$61.27871,100——
2021-01-20$62.54$62.54720,700——
2021-01-19$61.03$61.03759,400——
2021-01-15$61.28$61.281,273,900——
2021-01-14$61.35$61.35783,300——
2021-01-13$59.65$59.65900,900——
2021-01-12$59.15$59.15822,400——
2021-01-11$62.10$62.101,035,800——
2021-01-08$61.04$61.041,342,100——
2021-01-07$59.14$59.14933,100——
2021-01-06$56.19$56.191,100,800——
2021-01-05$55.93$55.93727,400——
2021-01-04$56.78$56.78925,200——