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 — 2020

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2020-12-31$56.54$56.54904,000——
2020-12-30$57.20$57.201,001,900——
2020-12-29$57.03$57.031,172,500——
2020-12-28$58.93$58.931,396,500——
2020-12-24$59.68$59.681,105,200——
2020-12-23$60.27$60.272,501,100——
2020-12-22$58.59$58.592,148,100——
2020-12-21$55.34$55.341,938,000——
2020-12-18$54.33$54.332,909,100——
2020-12-17$51.19$51.191,440,700——
2020-12-16$49.79$49.791,282,300——
2020-12-15$51.49$51.492,483,300——
2020-12-14$47.83$47.832,109,700——
2020-12-11$45.81$45.81995,100——
2020-12-10$46.38$46.38970,600——
2020-12-09$46.65$46.651,362,200——
2020-12-08$48.98$48.981,261,900——
2020-12-07$50.31$50.31859,200——
2020-12-04$51.22$51.22566,100——
2020-12-03$50.97$50.97520,400——
2020-12-02$51.31$51.31805,500——
2020-12-01$51.12$51.121,381,600——
2020-11-30$50.53$50.532,616,800——
2020-11-27$51.13$51.13416,000——
2020-11-25$50.24$50.24688,800——
2020-11-24$50.04$50.04606,100——
2020-11-23$50.27$50.27708,500——
2020-11-20$49.14$49.14938,300——
2020-11-19$50.45$50.45655,800——
2020-11-18$50.68$50.68846,600——
2020-11-17$52.51$52.51564,100——
2020-11-16$52.15$52.15866,300——
2020-11-13$51.57$51.57995,400——
2020-11-12$49.25$49.25954,100——
2020-11-11$49.21$49.21589,800——
2020-11-10$50.18$50.18960,800——
2020-11-09$50.10$50.101,226,600——
2020-11-06$48.63$48.63679,400——
2020-11-05$48.72$48.722,392,200——
2020-11-04$47.61$47.611,330,700——
2020-11-03$47.00$47.00651,300——
2020-11-02$46.77$46.77649,600——
2020-10-30$46.95$46.95977,500——
2020-10-29$46.85$46.85726,200——
2020-10-28$45.82$45.82630,700——
2020-10-27$46.98$46.981,200,000——
2020-10-26$47.01$47.01567,300——
2020-10-23$47.34$47.34512,800——
2020-10-22$47.19$47.191,015,000——
2020-10-21$46.36$46.36981,600——
2020-10-20$47.40$47.40569,700——
2020-10-19$47.20$47.20837,800——
2020-10-16$47.13$47.131,435,300——
2020-10-15$48.29$48.292,838,700——
2020-10-14$47.71$47.711,077,000——
2020-10-13$47.97$47.971,534,700——
2020-10-12$46.48$46.48874,200——
2020-10-09$45.94$45.94665,600——
2020-10-08$46.86$46.86853,100——
2020-10-07$46.42$46.42960,100——
2020-10-06$45.30$45.301,277,200——
2020-10-05$47.58$47.582,186,200——
2020-10-02$45.65$45.651,800,600——
2020-10-01$47.76$47.761,602,400——
2020-09-30$47.45$47.451,066,400——
2020-09-29$48.48$48.481,097,800——
2020-09-28$49.03$49.03506,400——
2020-09-25$48.70$48.701,007,300——
2020-09-24$48.64$48.641,691,200——
2020-09-23$49.33$49.332,375,700——
2020-09-22$50.77$50.771,727,900——
2020-09-21$50.20$50.20946,300——
2020-09-18$51.39$51.391,075,500——
2020-09-17$51.29$51.29900,900——
2020-09-16$51.77$51.771,003,000——
2020-09-15$52.93$52.93718,500——
2020-09-14$53.74$53.74685,400——
2020-09-11$51.97$51.97613,500——
2020-09-10$51.52$51.52892,300——
2020-09-09$53.15$53.15708,300——
2020-09-08$52.72$52.72949,900——
2020-09-04$55.61$55.61945,700——
2020-09-03$55.27$55.27773,400——
2020-09-02$55.06$55.06673,900——
2020-09-01$54.27$54.27672,100——
2020-08-31$54.50$54.50802,200——
2020-08-28$52.79$52.79332,400——
2020-08-27$52.61$52.61384,800——
2020-08-26$52.31$52.31419,800——
2020-08-25$52.90$52.90452,100——
2020-08-24$52.13$52.13595,700——
2020-08-21$52.67$52.67383,300——
2020-08-20$53.05$53.05966,100——
2020-08-19$52.28$52.28924,400——
2020-08-18$53.65$53.65536,800——
2020-08-17$53.99$53.99381,700——
2020-08-14$52.78$52.78394,600——
2020-08-13$53.09$53.09486,900——
2020-08-12$52.98$52.98620,300——
2020-08-11$53.42$53.421,124,200——
2020-08-10$54.10$54.10851,600——
2020-08-07$56.21$56.211,217,200——
2020-08-06$56.51$56.51749,400——
2020-08-05$57.48$57.481,338,100——
2020-08-04$59.24$59.24454,300——
2020-08-03$59.19$59.19491,000——
2020-07-31$57.56$57.561,047,400——
2020-07-30$59.02$59.02518,800——
2020-07-29$58.78$58.78528,700——
2020-07-28$59.41$59.41494,000——
2020-07-27$60.29$60.29492,900——
2020-07-24$58.95$58.95486,400——
2020-07-23$59.70$59.70565,400——
2020-07-22$60.67$60.67347,500——
2020-07-21$61.05$61.05412,900——
2020-07-20$62.07$62.07572,900——
2020-07-17$62.15$62.15786,900——
2020-07-16$62.19$62.19634,400——
2020-07-15$62.95$62.95687,200——
2020-07-14$61.50$61.50743,100——
2020-07-13$61.04$61.04826,900——
2020-07-10$62.09$62.09807,600——
2020-07-09$60.44$60.44439,600——
2020-07-08$60.91$60.91631,600——
2020-07-07$61.39$61.39520,400——
2020-07-06$60.78$60.78955,300——
2020-07-02$60.79$60.79615,300——
2020-07-01$60.20$60.20656,600——
2020-06-30$58.96$58.961,253,000——
2020-06-29$59.40$59.40509,900——
2020-06-26$60.09$60.091,796,900——
2020-06-25$61.05$61.05862,800——
2020-06-24$59.10$59.10969,400——
2020-06-23$57.82$57.82953,800——
2020-06-22$59.34$59.34673,400——
2020-06-19$58.95$58.951,610,200——
2020-06-18$58.20$58.20361,300——
2020-06-17$57.65$57.65641,200——
2020-06-16$57.00$57.00698,700——
2020-06-15$57.21$57.21624,500——
2020-06-12$58.37$58.371,007,600——
2020-06-11$56.51$56.511,249,600——
2020-06-10$58.57$58.57995,100——
2020-06-09$58.48$58.48669,400——
2020-06-08$58.83$58.83706,000——
2020-06-05$57.56$57.56880,200——
2020-06-04$55.86$55.86687,300——
2020-06-03$56.82$56.82824,700——
2020-06-02$57.67$57.67731,300——
2020-06-01$56.84$56.84624,800——
2020-05-29$56.21$56.211,327,900——
2020-05-28$56.44$56.44772,200——
2020-05-27$56.12$56.121,054,200——
2020-05-26$56.04$56.041,426,900——
2020-05-22$54.47$54.47392,100——
2020-05-21$54.30$54.30521,300——
2020-05-20$54.22$54.22679,500——
2020-05-19$53.50$53.50929,000——
2020-05-18$55.02$55.02849,200——
2020-05-15$53.07$53.07776,600——
2020-05-14$52.33$52.331,043,200——
2020-05-13$54.43$54.43613,200——
2020-05-12$55.90$55.90920,100——
2020-05-11$56.18$56.18919,800——
2020-05-08$54.40$54.40967,900——
2020-05-07$53.26$53.261,409,100——
2020-05-06$56.51$56.51834,600——
2020-05-05$57.73$57.73587,700——
2020-05-04$57.65$57.65680,800——
2020-05-01$55.32$55.32631,100——
2020-04-30$55.53$55.53893,000——
2020-04-29$56.85$56.85657,600——
2020-04-28$57.20$57.20853,300——
2020-04-27$58.38$58.38831,500——
2020-04-24$58.15$58.15781,500——
2020-04-23$56.96$56.96857,700——
2020-04-22$54.67$54.67642,300——
2020-04-21$53.38$53.38770,800——
2020-04-20$55.54$55.54849,200——
2020-04-17$55.07$55.07936,800——
2020-04-16$53.28$53.28834,400——
2020-04-15$50.81$50.81767,300——
2020-04-14$52.77$52.77777,400——
2020-04-13$51.25$51.25857,800——
2020-04-09$53.00$53.00559,200——
2020-04-08$52.50$52.50824,700——
2020-04-07$50.07$50.071,003,800——
2020-04-06$51.46$51.46965,100——
2020-04-03$48.51$48.511,038,200——
2020-04-02$49.01$49.011,049,200——
2020-04-01$46.85$46.85761,000——
2020-03-31$47.28$47.28709,900——
2020-03-30$48.21$48.21970,800——
2020-03-27$49.41$49.411,024,300——
2020-03-26$49.75$49.751,299,100——
2020-03-25$46.75$46.751,132,000——
2020-03-24$44.83$44.831,156,600——
2020-03-23$41.60$41.601,342,100——
2020-03-20$43.58$43.581,387,500——
2020-03-19$46.07$46.071,064,000——
2020-03-18$43.46$43.461,197,900——
2020-03-17$44.50$44.501,780,200——
2020-03-16$43.25$43.251,417,600——
2020-03-13$48.41$48.411,490,900——
2020-03-12$44.33$44.331,467,600——
2020-03-11$49.14$49.141,314,800——
2020-03-10$52.82$52.821,138,400——
2020-03-09$51.33$51.331,315,300——
2020-03-06$53.88$53.881,302,200——
2020-03-05$52.92$52.921,398,900——
2020-03-04$54.59$54.591,149,800——
2020-03-03$50.72$50.721,237,900——
2020-03-02$52.30$52.301,727,900——
2020-02-28$50.78$50.781,999,100——
2020-02-27$53.29$53.291,267,000——
2020-02-26$56.02$56.021,354,800——
2020-02-25$55.30$55.301,156,000——
2020-02-24$57.10$57.101,030,400——
2020-02-21$60.49$60.49491,300——
2020-02-20$61.29$61.29521,800——
2020-02-19$61.73$61.73427,900——
2020-02-18$61.57$61.57731,100——
2020-02-14$60.13$60.13359,100——
2020-02-13$60.06$60.06666,600——
2020-02-12$60.51$60.51642,000——
2020-02-11$60.31$60.31550,200——
2020-02-10$59.98$59.98378,200——
2020-02-07$60.49$60.49858,700——
2020-02-06$61.28$61.281,747,700——
2020-02-05$58.98$58.98884,600——
2020-02-04$58.99$58.99761,000——
2020-02-03$58.44$58.44543,000——
2020-01-31$58.32$58.321,016,500——
2020-01-30$59.55$59.551,052,500——
2020-01-29$60.69$60.69495,200——
2020-01-28$59.91$59.91487,500——
2020-01-27$59.09$59.09834,500——
2020-01-24$59.42$59.42821,500——
2020-01-23$60.40$60.40657,800——
2020-01-22$61.23$61.231,090,400——
2020-01-21$60.02$60.021,704,200——
2020-01-17$60.13$60.131,916,000——
2020-01-16$61.46$61.461,501,900——
2020-01-15$62.06$62.06810,000——
2020-01-14$63.40$63.40676,900——
2020-01-13$62.78$62.78968,100——
2020-01-10$62.68$62.68675,600——
2020-01-09$63.27$63.27706,800——
2020-01-08$62.44$62.44684,200——
2020-01-07$61.19$61.19690,800——
2020-01-06$60.51$60.51669,000——
2020-01-03$60.44$60.44729,900——
2020-01-02$60.89$60.89939,300——