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 — 2000

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2000-12-29$10.63$10.63406,200
2000-12-28$10.06$10.06246,700
2000-12-27$10.19$10.19318,900
2000-12-26$10.06$10.06242,600
2000-12-22$10.38$10.38419,200
2000-12-21$9.44$9.44515,900
2000-12-20$9.06$9.06546,200
2000-12-19$9.75$9.75362,400
2000-12-18$9.75$9.75370,300
2000-12-15$9.50$9.50289,200
2000-12-14$9.22$9.22186,500
2000-12-13$9.50$9.50149,400
2000-12-12$9.69$9.69110,000
2000-12-11$10.00$10.00182,400
2000-12-08$10.06$10.06214,600
2000-12-07$9.59$9.59122,800
2000-12-06$9.44$9.44180,300
2000-12-05$10.19$10.19246,500
2000-12-04$9.38$9.38211,100
2000-12-01$10.00$10.00225,100
2000-11-30$9.13$9.13271,400
2000-11-29$9.34$9.34601,700
2000-11-28$10.19$10.19368,400
2000-11-27$11.19$11.19268,100
2000-11-24$10.69$10.69114,300
2000-11-22$9.81$9.81207,600
2000-11-21$10.19$10.19192,400
2000-11-20$10.13$10.13416,800
2000-11-17$11.56$11.56211,100
2000-11-16$11.50$11.50179,500
2000-11-15$12.13$12.13200,800
2000-11-14$12.00$12.00183,400
2000-11-13$11.50$11.50307,700
2000-11-10$12.56$12.56261,100
2000-11-09$13.00$13.00982,800
2000-11-08$13.00$13.002,183,300
2000-11-07$11.75$11.75420,400
2000-11-06$11.50$11.50377,100
2000-11-03$11.06$11.06169,100
2000-11-02$11.50$11.50463,200
2000-11-01$10.69$10.69378,200
2000-10-31$10.31$10.31245,100
2000-10-30$9.78$9.78189,500
2000-10-27$9.94$9.94201,600
2000-10-26$10.13$10.13154,800
2000-10-25$10.06$10.06234,100
2000-10-24$10.50$10.50229,600
2000-10-23$10.31$10.31253,900
2000-10-20$10.19$10.19235,700
2000-10-19$10.31$10.31227,000
2000-10-18$10.25$10.25329,700
2000-10-17$9.50$9.50144,100
2000-10-16$10.06$10.06141,800
2000-10-13$9.72$9.72397,900
2000-10-12$9.56$9.56229,900
2000-10-11$9.75$9.75264,400
2000-10-10$10.19$10.19280,700
2000-10-09$10.50$10.50140,200
2000-10-06$10.80$10.801,260,600
2000-10-05$10.94$10.94999,800
2000-10-04$10.88$10.88293,000
2000-10-03$10.50$10.50247,600
2000-10-02$11.00$11.00335,900
2000-09-29$11.50$11.50546,300
2000-09-28$11.06$11.06435,000
2000-09-27$10.56$10.56147,600
2000-09-26$10.81$10.81229,600
2000-09-25$11.00$11.00190,600
2000-09-22$11.19$11.19185,200
2000-09-21$10.94$10.94135,800
2000-09-20$11.00$11.00357,500
2000-09-19$11.00$11.00296,200
2000-09-18$10.63$10.63417,200
2000-09-15$11.63$11.63410,000
2000-09-14$11.63$11.63354,000
2000-09-13$11.50$11.50258,000
2000-09-12$11.44$11.44522,200
2000-09-11$11.94$11.94307,500
2000-09-08$12.88$12.88164,000
2000-09-07$12.88$12.88162,300
2000-09-06$13.00$13.00426,000
2000-09-05$13.13$13.13708,000
2000-09-01$13.00$13.00191,200
2000-08-31$13.06$13.06385,400
2000-08-30$12.81$12.81167,200
2000-08-29$12.94$12.94302,800
2000-08-28$12.94$12.94578,300
2000-08-25$13.38$13.38445,000
2000-08-24$12.25$12.25270,700
2000-08-23$12.31$12.31185,700
2000-08-22$12.31$12.31182,900
2000-08-21$12.25$12.25135,300
2000-08-18$12.19$12.19178,300
2000-08-17$12.44$12.44149,600
2000-08-16$12.19$12.19216,200
2000-08-15$12.00$12.00212,900
2000-08-14$12.06$12.06147,500
2000-08-11$12.06$12.06216,300
2000-08-10$11.88$11.88205,800
2000-08-09$12.31$12.31272,100
2000-08-08$12.63$12.63114,300
2000-08-07$12.44$12.44212,300
2000-08-04$12.13$12.13425,400
2000-08-03$12.50$12.50789,900
2000-08-02$11.13$11.13199,100
2000-08-01$11.56$11.56297,700
2000-07-31$11.25$11.25401,000
2000-07-28$10.50$10.50314,400
2000-07-27$10.88$10.88153,400
2000-07-26$11.19$11.19213,700
2000-07-25$11.56$11.56266,100
2000-07-24$12.25$12.25132,000
2000-07-21$12.69$12.69170,200
2000-07-20$12.31$12.31182,900
2000-07-19$12.63$12.63168,500
2000-07-18$13.00$13.00220,400
2000-07-17$12.63$12.63252,900
2000-07-14$12.88$12.88295,600
2000-07-13$13.56$13.56243,100
2000-07-12$14.31$14.31178,100
2000-07-11$14.13$14.13309,300
2000-07-10$14.13$14.13313,800
2000-07-07$15.00$15.00793,900
2000-07-06$14.75$14.75204,400
2000-07-05$14.38$14.38192,900
2000-07-03$14.31$14.31147,500
2000-06-30$14.50$14.50407,800
2000-06-29$14.25$14.25408,900
2000-06-28$13.13$13.13190,500
2000-06-27$13.00$13.00154,400
2000-06-26$13.25$13.25243,700
2000-06-23$12.88$12.88223,800
2000-06-22$12.56$12.56305,200
2000-06-21$14.31$14.31437,900
2000-06-20$14.75$14.75451,500
2000-06-19$13.63$13.63248,400
2000-06-16$12.94$12.94168,600
2000-06-15$12.88$12.88162,800
2000-06-14$12.75$12.7599,000
2000-06-13$13.00$13.00279,700
2000-06-12$13.13$13.13432,100
2000-06-09$13.06$13.06350,000
2000-06-08$12.44$12.44412,200
2000-06-07$12.94$12.94573,600
2000-06-06$13.25$13.251,417,400
2000-06-05$10.94$10.94420,200
2000-06-02$10.25$10.25277,900
2000-06-01$10.00$10.00168,700
2000-05-31$9.25$9.25141,200
2000-05-30$10.00$10.00299,400
2000-05-26$8.94$8.94171,800
2000-05-25$8.69$8.69199,100
2000-05-24$8.50$8.50415,500
2000-05-23$9.00$9.00205,100
2000-05-22$9.50$9.50316,200
2000-05-19$10.44$10.44218,700
2000-05-18$10.70$10.70229,600
2000-05-17$10.69$10.69204,500
2000-05-16$11.13$11.13354,100
2000-05-15$10.38$10.38255,500
2000-05-12$10.31$10.31236,300
2000-05-11$10.25$10.25232,200
2000-05-10$10.06$10.06378,200
2000-05-09$10.75$10.75119,700
2000-05-08$11.00$11.00232,900
2000-05-05$11.44$11.44273,100
2000-05-04$11.50$11.50208,000
2000-05-03$10.94$10.94290,000
2000-05-02$11.50$11.50426,400
2000-05-01$12.31$12.31560,400
2000-04-28$11.13$11.13395,300
2000-04-27$10.50$10.50268,400
2000-04-26$10.63$10.63360,100
2000-04-25$11.06$11.06383,700
2000-04-24$11.50$11.50380,600
2000-04-20$10.63$10.63139,800
2000-04-19$10.63$10.63349,000
2000-04-18$11.38$11.38508,800
2000-04-17$9.88$9.88679,600
2000-04-14$10.50$10.50702,900
2000-04-13$12.38$12.38342,900
2000-04-12$13.06$13.06353,200
2000-04-11$13.06$13.06253,600
2000-04-10$14.13$14.13240,400
2000-04-07$15.56$15.56729,200
2000-04-06$15.00$15.00823,400
2000-04-05$13.94$13.94977,300
2000-04-04$12.38$12.381,013,500
2000-04-03$13.56$13.56370,400
2000-03-31$14.06$14.06501,600
2000-03-30$14.00$14.00648,100
2000-03-29$13.94$13.94510,200
2000-03-28$14.88$14.88483,700
2000-03-27$16.38$16.38308,200
2000-03-24$17.31$17.31401,800
2000-03-23$17.75$17.75813,500
2000-03-22$18.50$18.501,109,800
2000-03-21$15.13$15.13855,000
2000-03-20$15.19$15.19974,800
2000-03-17$16.63$16.63797,700
2000-03-16$17.69$17.69671,600
2000-03-15$17.56$17.561,033,800
2000-03-14$18.44$18.441,790,600
2000-03-13$21.81$21.811,060,700
2000-03-10$24.00$24.001,103,300
2000-03-09$24.00$24.001,035,800
2000-03-08$25.50$25.502,876,900
2000-03-07$28.19$28.193,252,800
2000-03-06$33.81$33.815,989,700
2000-03-03$24.38$24.382,672,100
2000-03-02$18.13$18.131,983,700
2000-03-01$16.00$16.002,275,700
2000-02-29$14.13$14.131,571,100
2000-02-28$12.19$12.19592,600
2000-02-25$12.63$12.63464,900
2000-02-24$12.81$12.81616,200
2000-02-23$12.75$12.75548,400
2000-02-22$12.94$12.941,352,300
2000-02-18$13.94$13.941,556,900
2000-02-17$12.50$12.501,360,900
2000-02-16$11.50$11.50749,600
2000-02-15$11.06$11.06344,100
2000-02-14$11.25$11.25442,100
2000-02-11$10.94$10.94735,600
2000-02-10$11.13$11.131,420,700
2000-02-09$10.00$10.00850,400
2000-02-08$9.75$9.75820,200
2000-02-07$9.75$9.751,202,500
2000-02-04$8.50$8.50472,400
2000-02-03$8.38$8.38330,700
2000-02-02$7.94$7.94149,800
2000-02-01$8.38$8.38319,300
2000-01-31$7.81$7.81278,400
2000-01-28$7.81$7.81259,100
2000-01-27$8.25$8.25564,100
2000-01-26$7.56$7.56204,900
2000-01-25$7.59$7.59288,000
2000-01-24$7.69$7.69532,100
2000-01-21$7.31$7.31619,600
2000-01-20$7.44$7.44356,900
2000-01-19$7.50$7.50745,500
2000-01-18$7.69$7.69792,300
2000-01-14$8.69$8.69628,600
2000-01-13$9.25$9.252,870,800
2000-01-12$10.19$10.196,987,100
2000-01-11$7.56$7.56636,100
2000-01-10$7.81$7.81928,100
2000-01-07$7.25$7.25942,200
2000-01-06$6.81$6.81487,900
2000-01-05$6.94$6.94650,800
2000-01-04$5.94$5.94499,600
2000-01-03$5.88$5.88485,500