NASDAQ:IONS | Stock Price History | 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.

Historical Stock Price

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2026-09-04$58.62140,131
2026-09-03$60.24229,897
2026-09-02$60.43105,932
2026-09-01$60.5477,091
2026-08-31$60.94107,950
2026-08-28$60.69112,365
2026-08-27$62.43$62.431,625,200$63.4888,873
2026-08-26$63.36$63.362,152,200$63.7971,729
2026-08-25$63.57$63.572,432,000$62.27192,077
2026-08-24$62.04$62.042,206,900$60.54158,739
2026-08-21$59.74$59.742,723,500$59.38152,002
2026-08-20$58.76$58.762,124,800$60.03152,342
2026-08-19$60.80$60.803,137,600$60.18224,152
2026-08-18$59.62$59.623,192,500$58.42140,673
2026-08-17$58.63$58.632,000,200$57.4290,268
2026-08-14$57.24$57.241,353,700$55.5261,347
2026-08-13$55.87$55.871,220,400$56.5161,315
2026-08-12$56.53$56.531,999,700$55.3283,183
2026-08-11$55.42$55.422,406,900$57.09115,423
2026-08-10$56.94$56.942,399,800$56.4771,597
2026-08-07$56.56$56.562,009,200$54.7788,661
2026-08-06$54.49$54.492,592,300$54.54116,448
2026-08-05$54.19$54.192,122,300$55.28117,324
2026-08-04$55.07$55.072,688,200$54.77105,011
2026-08-03$54.49$54.493,212,600$52.86128,762
2026-07-31$51.77$51.772,570,500$53.33166,745
2026-07-30$53.28$53.282,875,000$53.65176,769
2026-07-29$54.04$54.043,129,200$55.10166,521
2026-07-28$55.30$55.302,804,600$56.39167,688
2026-07-27$55.96$55.962,584,700$56.93173,738
2026-07-24$56.55$56.553,094,700$56.54149,704
2026-07-23$55.87$55.873,834,300$53.58260,108
2026-07-22$54.01$54.018,732,700$51.26482,753
2026-07-21$53.39$53.393,074,000$52.72183,331
2026-07-20$52.95$52.952,166,900$54.51126,766
2026-07-17$54.39$54.392,572,800
2026-07-16$54.65$54.653,805,300
2026-07-15$54.73$54.733,577,100
2026-07-14$54.93$54.934,700,000
2026-07-13$56.75$56.755,097,900
2026-07-10$58.25$58.2511,444,100
2026-07-09$64.27$64.2720,447,600
2026-07-08$84.46$84.462,280,800
2026-07-07$86.33$86.332,646,700
2026-07-06$83.18$83.181,847,400
2026-07-02$81.80$81.802,301,700
2026-07-01$79.19$79.191,442,400
2026-06-30$79.29$79.292,380,300
2026-06-29$80.69$80.692,806,600
2026-06-26$81.18$81.183,828,200
2026-06-25$78.34$78.342,583,200
2026-06-24$76.52$76.522,485,700
2026-06-23$75.99$75.991,405,400
2026-06-22$75.89$75.891,956,100
2026-06-18$74.12$74.122,984,400
2026-06-17$74.31$74.311,788,200
2026-06-16$73.09$73.091,801,400
2026-06-15$73.96$73.961,506,300
2026-06-12$73.28$73.281,964,900
2026-06-11$73.82$73.822,234,400
2026-06-10$73.32$73.321,595,700
2026-06-09$74.58$74.581,568,700
2026-06-08$73.54$73.541,620,700
2026-06-05$74.48$74.481,982,000
2026-06-04$75.13$75.131,240,800
2026-06-03$73.82$73.821,303,900
2026-06-02$72.97$72.972,086,200
2026-06-01$75.38$75.381,467,700
2026-05-29$76.50$76.501,675,600
2026-05-28$77.33$77.331,603,000
2026-05-27$76.49$76.491,341,300
2026-05-26$76.07$76.071,279,200
2026-05-22$75.56$75.561,579,200
2026-05-21$75.78$75.782,295,200
2026-05-20$75.06$75.062,005,300
2026-05-19$73.84$73.841,519,500
2026-05-18$72.52$72.522,211,500
2026-05-15$74.23$74.232,119,200
2026-05-14$75.68$75.681,798,300
2026-05-13$77.60$77.601,360,300
2026-05-12$75.83$75.831,408,900
2026-05-11$75.38$75.381,533,700
2026-05-08$75.71$75.711,656,200
2026-05-07$76.02$76.021,885,700
2026-05-06$76.85$76.851,799,900
2026-05-05$75.25$75.25850,200
2026-05-04$75.45$75.451,689,400
2026-05-01$75.28$75.281,821,500
2026-04-30$74.76$74.762,430,300
2026-04-29$74.83$74.833,675,200
2026-04-28$71.78$71.782,396,300
2026-04-27$72.23$72.232,311,600
2026-04-24$73.27$73.271,817,400
2026-04-23$74.09$74.091,377,400
2026-04-22$74.83$74.832,024,000
2026-04-21$74.78$74.781,818,800
2026-04-20$74.87$74.871,106,800
2026-04-17$75.71$75.711,719,400
2026-04-16$75.26$75.261,873,900
2026-04-15$76.82$76.821,288,400