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 — 1991

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1991-12-31$13.75$13.75280,000
1991-12-30$13.00$13.0055,200
1991-12-27$12.50$12.5016,300
1991-12-26$12.50$12.5033,100
1991-12-24$12.50$12.5094,800
1991-12-23$12.75$12.7581,600
1991-12-20$12.75$12.7594,900
1991-12-19$12.00$12.0039,200
1991-12-18$12.25$12.2538,400
1991-12-17$11.75$11.7547,700
1991-12-16$12.13$12.1345,200
1991-12-13$11.38$11.38200,500
1991-12-12$11.00$11.00281,700
1991-12-11$12.00$12.0054,700
1991-12-10$12.50$12.5066,900
1991-12-09$12.75$12.75163,500
1991-12-06$13.00$13.00114,500
1991-12-05$12.25$12.25700,100
1991-12-04$13.00$13.00106,200
1991-12-03$14.50$14.5068,200
1991-12-02$13.50$13.5032,600
1991-11-29$13.50$13.509,900
1991-11-27$13.50$13.5020,400
1991-11-26$13.75$13.7534,900
1991-11-25$13.75$13.7524,400
1991-11-22$13.63$13.6366,400
1991-11-21$15.00$15.0096,800
1991-11-20$14.75$14.7592,200
1991-11-19$14.75$14.7592,500
1991-11-18$14.75$14.75252,200
1991-11-15$15.75$15.75148,700
1991-11-14$17.75$17.75142,400
1991-11-13$19.25$19.2596,200
1991-11-12$19.75$19.7534,300
1991-11-11$19.75$19.7521,900
1991-11-08$19.13$19.1327,600
1991-11-07$19.00$19.0012,200
1991-11-06$19.50$19.5043,900
1991-11-05$20.00$20.0084,900
1991-11-04$21.25$21.2565,200
1991-11-01$21.00$21.0070,600
1991-10-31$20.00$20.0090,700
1991-10-30$19.00$19.0058,900
1991-10-29$19.00$19.0023,800
1991-10-28$19.00$19.0034,600
1991-10-25$18.25$18.2590,000
1991-10-24$18.75$18.75235,200
1991-10-23$21.25$21.25296,100
1991-10-22$20.00$20.00127,200
1991-10-21$18.75$18.7591,700
1991-10-18$17.50$17.50102,100
1991-10-17$16.75$16.7527,200
1991-10-16$17.50$17.50150,500
1991-10-15$17.25$17.2531,400
1991-10-14$17.00$17.0067,500
1991-10-11$16.25$16.2540,200
1991-10-10$16.75$16.7511,100
1991-10-09$16.75$16.7516,400
1991-10-08$16.88$16.88164,100
1991-10-07$16.63$16.6318,400
1991-10-04$17.00$17.007,500
1991-10-03$17.25$17.2525,900
1991-10-02$16.25$16.2545,300
1991-10-01$16.25$16.2585,200
1991-09-30$16.75$16.7520,100
1991-09-27$16.75$16.75100,800
1991-09-26$16.50$16.5012,700
1991-09-25$16.25$16.2510,200
1991-09-24$16.75$16.752,800
1991-09-23$16.00$16.00186,200
1991-09-20$18.00$18.0039,200
1991-09-19$17.25$17.2533,000
1991-09-18$17.25$17.2513,200
1991-09-17$17.75$17.754,400
1991-09-16$17.75$17.7545,700
1991-09-13$17.50$17.5099,300
1991-09-12$16.25$16.25176,400
1991-09-11$17.88$17.8852,200
1991-09-10$17.50$17.5030,400
1991-09-09$16.75$16.7515,900
1991-09-06$16.75$16.7517,400
1991-09-05$16.75$16.7512,500
1991-09-04$16.75$16.7553,700
1991-09-03$18.00$18.0060,000
1991-08-30$18.25$18.2571,200
1991-08-29$18.25$18.2571,600
1991-08-28$18.00$18.00248,400
1991-08-27$16.75$16.75148,500
1991-08-26$15.25$15.2581,500
1991-08-23$15.25$15.2560,900
1991-08-22$15.00$15.0063,700
1991-08-21$15.25$15.2542,300
1991-08-20$14.63$14.6349,400
1991-08-19$14.50$14.5052,800
1991-08-16$15.00$15.00113,100
1991-08-15$15.00$15.0072,100
1991-08-14$14.50$14.5028,900
1991-08-13$14.50$14.5057,600
1991-08-12$15.00$15.008,100
1991-08-09$14.75$14.7521,700
1991-08-08$14.75$14.7575,600
1991-08-07$15.00$15.0073,700
1991-08-06$14.75$14.7595,300
1991-08-05$14.75$14.7579,400
1991-08-02$14.50$14.5076,200
1991-08-01$14.25$14.2586,600
1991-07-31$14.25$14.25299,900
1991-07-30$13.75$13.75184,200
1991-07-29$12.75$12.7595,700
1991-07-26$12.50$12.5089,600
1991-07-25$12.00$12.00129,700
1991-07-24$12.00$12.0010,700
1991-07-23$11.88$11.8898,300
1991-07-22$12.50$12.50276,000
1991-07-19$12.75$12.75761,200
1991-07-18$10.00$10.007,000
1991-07-17$10.00$10.003,100
1991-07-16$9.50$9.5016,000
1991-07-15$9.25$9.2530,700
1991-07-12$10.00$10.001,900
1991-07-11$9.50$9.509,400
1991-07-10$9.63$9.6318,900
1991-07-09$9.75$9.7513,200
1991-07-08$9.50$9.50101,800
1991-07-05$9.75$9.751,200
1991-07-03$9.75$9.757,500
1991-07-02$10.25$10.2515,400
1991-07-01$10.25$10.2517,100
1991-06-28$10.25$10.2556,400
1991-06-27$10.25$10.252,500
1991-06-26$9.75$9.754,900
1991-06-25$10.25$10.2523,300
1991-06-24$9.75$9.754,600
1991-06-21$10.13$10.1342,800
1991-06-20$10.25$10.2517,000
1991-06-19$10.25$10.2550,000
1991-06-18$10.25$10.2565,300
1991-06-17$10.25$10.2525,000
1991-06-14$10.75$10.75106,200
1991-06-13$10.00$10.0067,700
1991-06-12$10.50$10.50179,900
1991-06-11$9.25$9.2515,900
1991-06-10$9.50$9.5010,100
1991-06-07$9.50$9.5027,500
1991-06-06$9.25$9.257,400
1991-06-05$9.25$9.257,000
1991-06-04$9.25$9.2521,400
1991-06-03$9.25$9.2561,400
1991-05-31$9.50$9.5024,100
1991-05-30$9.75$9.7515,100
1991-05-29$9.75$9.7550,700
1991-05-28$9.25$9.2518,200
1991-05-24$9.13$9.1322,600
1991-05-23$9.13$9.1381,100
1991-05-22$9.00$9.0054,800
1991-05-21$9.00$9.00281,700
1991-05-20$9.00$9.00251,600
1991-05-17$10.00$10.001,291,600