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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$79.11$79.111,096,900
2025-12-30$78.97$78.971,146,100
2025-12-29$79.98$79.981,077,900
2025-12-26$79.93$79.93725,300
2025-12-24$80.65$80.65480,200
2025-12-23$80.33$80.331,229,900
2025-12-22$81.34$81.342,257,800
2025-12-19$79.57$79.573,557,500
2025-12-18$77.63$77.631,765,600
2025-12-17$77.08$77.082,145,800
2025-12-16$78.37$78.371,959,700
2025-12-15$79.76$79.761,977,600
2025-12-12$80.82$80.821,468,900
2025-12-11$79.14$79.142,052,200
2025-12-10$78.63$78.632,659,300
2025-12-09$78.86$78.861,866,200
2025-12-08$81.51$81.511,553,600
2025-12-05$81.68$81.681,715,000
2025-12-04$81.81$81.812,317,800
2025-12-03$81.84$81.842,531,200
2025-12-02$81.31$81.312,454,600
2025-12-01$81.99$81.991,865,400
2025-11-28$82.73$82.73852,900
2025-11-26$82.70$82.702,955,400
2025-11-25$80.93$80.932,543,000
2025-11-24$78.52$78.523,217,000
2025-11-21$76.09$76.092,075,900
2025-11-20$73.12$73.123,208,800
2025-11-19$74.00$74.003,620,800
2025-11-18$74.50$74.502,056,700
2025-11-17$73.26$73.263,504,600
2025-11-14$71.55$71.553,372,300
2025-11-13$69.84$69.8411,502,700
2025-11-12$72.67$72.675,067,900
2025-11-11$72.45$72.452,268,600
2025-11-10$69.54$69.544,399,700
2025-11-07$73.55$73.552,332,300
2025-11-06$74.10$74.102,424,200
2025-11-05$74.68$74.682,259,100
2025-11-04$72.88$72.881,726,300
2025-11-03$73.65$73.652,576,000
2025-10-31$74.30$74.302,395,600
2025-10-30$74.17$74.172,177,600
2025-10-29$71.88$71.882,164,200
2025-10-28$73.57$73.572,559,600
2025-10-27$72.99$72.991,842,500
2025-10-24$70.86$70.861,990,300
2025-10-23$71.50$71.501,605,800
2025-10-22$71.50$71.501,508,400
2025-10-21$71.64$71.642,529,900
2025-10-20$73.55$73.551,395,600
2025-10-17$73.09$73.091,310,800
2025-10-16$73.07$73.071,739,500
2025-10-15$72.39$72.393,234,200
2025-10-14$71.37$71.371,264,800
2025-10-13$70.59$70.592,624,000
2025-10-10$69.97$69.971,697,200
2025-10-09$70.27$70.271,958,900
2025-10-08$69.96$69.963,102,600
2025-10-07$68.94$68.941,903,600
2025-10-06$69.02$69.021,824,000
2025-10-03$69.15$69.152,579,800
2025-10-02$68.40$68.402,999,300
2025-10-01$65.80$65.802,222,100
2025-09-30$65.42$65.422,140,300
2025-09-29$64.15$64.151,454,500
2025-09-26$64.09$64.091,522,300
2025-09-25$62.97$62.972,314,500
2025-09-24$63.94$63.941,592,500
2025-09-23$62.57$62.572,066,200
2025-09-22$61.36$61.362,682,800
2025-09-19$61.01$61.013,305,100
2025-09-18$61.74$61.741,644,700
2025-09-17$61.17$61.171,636,400
2025-09-16$61.32$61.321,787,600
2025-09-15$61.10$61.102,151,200
2025-09-12$63.16$63.161,471,400
2025-09-11$64.04$64.041,816,700
2025-09-10$64.00$64.002,258,100
2025-09-09$64.40$64.404,303,700
2025-09-08$61.00$61.002,774,500
2025-09-05$61.23$61.233,197,700
2025-09-04$59.35$59.353,906,300
2025-09-03$60.49$60.4910,338,200
2025-09-02$57.49$57.4916,461,700
2025-08-29$42.64$42.641,152,700
2025-08-28$42.62$42.621,097,700
2025-08-27$42.75$42.751,949,900
2025-08-26$42.17$42.172,596,500
2025-08-25$41.82$41.821,572,000
2025-08-22$42.69$42.691,859,900
2025-08-21$43.24$43.241,876,600
2025-08-20$42.81$42.812,286,000
2025-08-19$42.48$42.482,003,800
2025-08-18$43.43$43.431,500,800
2025-08-15$43.78$43.781,602,700
2025-08-14$42.85$42.851,582,300
2025-08-13$43.10$43.103,020,900
2025-08-12$41.41$41.411,488,500
2025-08-11$40.84$40.841,799,800
2025-08-08$41.64$41.641,739,200
2025-08-07$41.05$41.052,741,700
2025-08-06$40.69$40.692,469,800
2025-08-05$43.05$43.052,818,400
2025-08-04$43.45$43.452,311,200
2025-08-01$43.03$43.032,327,900
2025-07-31$42.98$42.983,544,000
2025-07-30$43.37$43.374,183,400
2025-07-29$41.48$41.481,503,900
2025-07-28$41.17$41.171,640,700
2025-07-25$42.25$42.25887,900
2025-07-24$42.15$42.15879,300
2025-07-23$42.38$42.381,440,100
2025-07-22$41.95$41.951,458,500
2025-07-21$41.55$41.551,417,800
2025-07-18$41.76$41.761,266,300
2025-07-17$42.17$42.171,996,400
2025-07-16$42.77$42.771,384,400
2025-07-15$42.00$42.001,799,400
2025-07-14$42.55$42.552,444,800
2025-07-11$41.73$41.731,545,200
2025-07-10$42.38$42.381,951,900
2025-07-09$42.83$42.831,686,200
2025-07-08$41.34$41.341,752,900
2025-07-07$41.78$41.782,239,900
2025-07-03$43.00$43.001,336,000
2025-07-02$43.59$43.594,232,700
2025-07-01$39.94$39.943,308,500
2025-06-30$39.51$39.511,597,100
2025-06-27$39.80$39.802,481,700
2025-06-26$39.78$39.781,806,000
2025-06-25$40.00$40.001,988,500
2025-06-24$39.64$39.642,840,100
2025-06-23$37.67$37.671,438,600
2025-06-20$37.41$37.412,290,500
2025-06-18$37.01$37.011,964,400
2025-06-17$36.15$36.151,621,600
2025-06-16$35.24$35.241,716,600
2025-06-13$35.59$35.591,484,000
2025-06-12$35.62$35.621,683,300
2025-06-11$36.19$36.191,577,300
2025-06-10$36.84$36.841,596,400
2025-06-09$36.76$36.762,032,600
2025-06-06$35.29$35.291,197,300
2025-06-05$35.24$35.24835,100
2025-06-04$35.11$35.111,202,200
2025-06-03$34.76$34.761,504,200
2025-06-02$34.11$34.111,398,700
2025-05-30$33.51$33.511,654,700
2025-05-29$33.46$33.462,018,000
2025-05-28$32.43$32.432,857,500
2025-05-27$33.32$33.321,919,300
2025-05-23$32.98$32.98963,500
2025-05-22$33.26$33.26943,400
2025-05-21$33.50$33.501,086,800
2025-05-20$34.47$34.471,173,300
2025-05-19$34.03$34.03811,300
2025-05-16$33.56$33.56894,000
2025-05-15$32.99$32.991,113,600
2025-05-14$32.60$32.60693,300
2025-05-13$32.53$32.531,358,500
2025-05-12$33.53$33.531,438,800
2025-05-09$32.26$32.26946,900
2025-05-08$32.75$32.751,916,000
2025-05-07$33.07$33.072,155,200
2025-05-06$31.86$31.861,955,900
2025-05-05$33.65$33.652,004,500
2025-05-02$32.78$32.781,890,300
2025-05-01$31.71$31.712,691,100
2025-04-30$30.71$30.712,396,900
2025-04-29$29.81$29.811,693,700
2025-04-28$29.74$29.741,652,700
2025-04-25$29.70$29.701,015,600
2025-04-24$29.57$29.571,797,700
2025-04-23$29.10$29.101,095,000
2025-04-22$29.03$29.031,197,900
2025-04-21$28.51$28.51950,600
2025-04-17$28.40$28.40842,700
2025-04-16$28.35$28.351,627,000
2025-04-15$28.38$28.381,522,800
2025-04-14$28.68$28.682,798,600
2025-04-11$27.90$27.902,011,000
2025-04-10$26.71$26.712,145,200
2025-04-09$27.77$27.773,444,700
2025-04-08$25.51$25.512,478,000
2025-04-07$27.57$27.572,735,200
2025-04-04$27.09$27.092,292,700
2025-04-03$28.52$28.521,920,700
2025-04-02$28.71$28.711,947,500
2025-04-01$27.26$27.263,019,900
2025-03-31$30.17$30.172,042,900
2025-03-28$31.15$31.15799,700
2025-03-27$31.72$31.721,151,300
2025-03-26$31.49$31.491,431,200
2025-03-25$32.27$32.271,980,300
2025-03-24$33.45$33.451,443,100
2025-03-21$32.91$32.911,999,100
2025-03-20$32.73$32.731,215,500
2025-03-19$33.34$33.341,120,400
2025-03-18$32.95$32.951,014,000
2025-03-17$34.30$34.301,352,300
2025-03-14$32.96$32.961,205,700
2025-03-13$32.90$32.901,791,700
2025-03-12$33.41$33.412,084,400
2025-03-11$33.03$33.031,931,400
2025-03-10$32.22$32.222,259,400
2025-03-07$33.81$33.811,534,400
2025-03-06$34.39$34.391,703,600
2025-03-05$33.75$33.751,827,400
2025-03-04$32.95$32.951,482,600
2025-03-03$32.60$32.601,512,200
2025-02-28$33.19$33.192,008,900
2025-02-27$31.35$31.35840,600
2025-02-26$31.76$31.761,457,800
2025-02-25$31.85$31.851,944,900
2025-02-24$31.89$31.891,430,700
2025-02-21$32.32$32.321,569,900
2025-02-20$32.69$32.693,189,900
2025-02-19$31.81$31.813,382,400
2025-02-18$31.95$31.952,535,500
2025-02-14$31.04$31.041,445,700
2025-02-13$30.35$30.351,490,200
2025-02-12$30.84$30.841,231,200
2025-02-11$31.58$31.581,101,100
2025-02-10$31.48$31.48898,300
2025-02-07$31.40$31.401,184,400
2025-02-06$32.63$32.631,237,500
2025-02-05$33.17$33.171,594,400
2025-02-04$31.64$31.641,700,600
2025-02-03$32.13$32.131,662,600
2025-01-31$31.90$31.902,457,700
2025-01-30$33.32$33.322,135,400
2025-01-29$32.88$32.881,923,400
2025-01-28$34.11$34.111,284,800
2025-01-27$34.05$34.052,080,900
2025-01-24$34.75$34.751,643,000
2025-01-23$34.46$34.462,329,400
2025-01-22$32.50$32.501,052,400
2025-01-21$32.68$32.681,540,400
2025-01-17$31.43$31.431,374,600
2025-01-16$32.28$32.282,547,700
2025-01-15$33.21$33.211,720,200
2025-01-14$32.69$32.692,017,100
2025-01-13$34.94$34.941,890,400
2025-01-10$33.46$33.461,171,900
2025-01-08$34.10$34.10759,300
2025-01-07$34.97$34.971,490,300
2025-01-06$34.10$34.101,136,800
2025-01-03$34.81$34.81756,600
2025-01-02$34.69$34.691,921,100