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 — 1997

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1997-12-31$12.31$12.31287,200
1997-12-30$12.13$12.13303,200
1997-12-29$12.00$12.00174,500
1997-12-26$12.56$12.56174,600
1997-12-24$12.31$12.31138,400
1997-12-23$11.50$11.50131,400
1997-12-22$11.56$11.56260,700
1997-12-19$12.00$12.00221,000
1997-12-18$12.38$12.38150,900
1997-12-17$12.63$12.63164,000
1997-12-16$13.00$13.00140,100
1997-12-15$12.88$12.88184,000
1997-12-12$13.19$13.1981,600
1997-12-11$13.31$13.31133,200
1997-12-10$13.38$13.38166,300
1997-12-09$13.63$13.6356,200
1997-12-08$14.06$14.06108,600
1997-12-05$14.00$14.00100,800
1997-12-04$14.00$14.00118,700
1997-12-03$14.13$14.13114,400
1997-12-02$14.38$14.3868,800
1997-12-01$15.00$15.00194,500
1997-11-28$14.81$14.8133,300
1997-11-26$14.88$14.8855,600
1997-11-25$14.63$14.6383,700
1997-11-24$14.50$14.5063,700
1997-11-21$15.06$15.0651,200
1997-11-20$15.13$15.1386,000
1997-11-19$14.94$14.94101,500
1997-11-18$15.25$15.2551,500
1997-11-17$15.50$15.5091,300
1997-11-14$15.13$15.1373,300
1997-11-13$15.16$15.1671,500
1997-11-12$15.25$15.2574,400
1997-11-11$15.75$15.7560,500
1997-11-10$15.88$15.88129,200
1997-11-07$15.50$15.50154,900
1997-11-06$16.25$16.2556,800
1997-11-05$16.63$16.6331,300
1997-11-04$16.25$16.25110,800
1997-11-03$16.50$16.5051,100
1997-10-31$16.44$16.4463,600
1997-10-30$16.19$16.19144,700
1997-10-29$15.94$15.94146,500
1997-10-28$15.44$15.44425,800
1997-10-27$15.00$15.00320,400
1997-10-24$17.00$17.0068,200
1997-10-23$17.13$17.13101,700
1997-10-22$17.38$17.3865,000
1997-10-21$17.50$17.50104,000
1997-10-20$17.56$17.5679,600
1997-10-17$17.25$17.25221,300
1997-10-16$17.81$17.81168,200
1997-10-15$18.00$18.00105,700
1997-10-14$17.63$17.63109,200
1997-10-13$17.75$17.7564,600
1997-10-10$17.81$17.8172,000
1997-10-09$17.50$17.50149,800
1997-10-08$17.75$17.75238,400
1997-10-07$18.00$18.0073,000
1997-10-06$17.88$17.8864,600
1997-10-03$17.75$17.75130,100
1997-10-02$17.63$17.6344,800
1997-10-01$17.38$17.38130,200
1997-09-30$17.81$17.8194,100
1997-09-29$17.38$17.38208,400
1997-09-26$17.25$17.2565,800
1997-09-25$17.25$17.2560,900
1997-09-24$17.25$17.2555,400
1997-09-23$17.50$17.5049,100
1997-09-22$17.75$17.75117,900
1997-09-19$17.00$17.00152,100
1997-09-18$17.38$17.3868,300
1997-09-17$17.13$17.13150,800
1997-09-16$17.38$17.38283,500
1997-09-15$18.00$18.00470,000
1997-09-12$17.34$17.34335,700
1997-09-11$16.88$16.88301,000
1997-09-10$16.75$16.75895,700
1997-09-09$15.63$15.63166,200
1997-09-08$15.44$15.4482,700
1997-09-05$15.25$15.2545,600
1997-09-04$15.25$15.25170,700
1997-09-03$15.38$15.3855,200
1997-09-02$15.00$15.0088,900
1997-08-29$15.06$15.0692,100
1997-08-28$15.00$15.0096,200
1997-08-27$14.38$14.38245,500
1997-08-26$15.38$15.38227,500
1997-08-25$15.25$15.25262,400
1997-08-22$14.00$14.00100,900
1997-08-21$13.88$13.8898,300
1997-08-20$14.00$14.00144,400
1997-08-19$14.00$14.00126,600
1997-08-18$14.06$14.06104,400
1997-08-15$14.00$14.0069,300
1997-08-14$14.00$14.0050,200
1997-08-13$13.50$13.50225,600
1997-08-12$14.00$14.00180,500
1997-08-11$14.13$14.13185,800
1997-08-08$14.25$14.25128,300
1997-08-07$14.44$14.44179,400
1997-08-06$14.31$14.31218,400
1997-08-05$13.94$13.94178,200
1997-08-04$13.25$13.25119,100
1997-08-01$13.00$13.00115,000
1997-07-31$13.25$13.2571,000
1997-07-30$13.25$13.25124,400
1997-07-29$13.38$13.38105,900
1997-07-28$13.25$13.25147,300
1997-07-25$13.13$13.13343,400
1997-07-24$12.88$12.88348,700
1997-07-23$13.38$13.3881,900
1997-07-22$13.63$13.63100,200
1997-07-21$13.25$13.25125,700
1997-07-18$13.63$13.6389,100
1997-07-17$13.88$13.8876,700
1997-07-16$14.06$14.06162,600
1997-07-15$14.13$14.13243,900
1997-07-14$14.13$14.13241,300
1997-07-11$13.88$13.8854,700
1997-07-10$13.88$13.88168,200
1997-07-09$13.19$13.19300,700
1997-07-08$14.13$14.13108,700
1997-07-07$14.16$14.16111,000
1997-07-03$14.25$14.2531,800
1997-07-02$14.50$14.5059,800
1997-07-01$14.38$14.3877,500
1997-06-30$14.56$14.5667,200
1997-06-27$14.75$14.7597,900
1997-06-26$14.44$14.4496,600
1997-06-25$14.88$14.8896,200
1997-06-24$15.00$15.0054,800
1997-06-23$14.88$14.8860,300
1997-06-20$14.88$14.88127,100
1997-06-19$14.88$14.8871,300
1997-06-18$14.88$14.8834,900
1997-06-17$15.06$15.0647,800
1997-06-16$15.13$15.1371,000
1997-06-13$15.13$15.1353,000
1997-06-12$15.16$15.16148,500
1997-06-11$15.38$15.38149,800
1997-06-10$15.19$15.1974,600
1997-06-09$15.50$15.5074,000
1997-06-06$15.50$15.50139,600
1997-06-05$15.06$15.06153,700
1997-06-04$14.50$14.50156,900
1997-06-03$15.19$15.1985,400
1997-06-02$15.50$15.50125,600
1997-05-30$15.75$15.7527,400
1997-05-29$15.73$15.7327,400
1997-05-28$15.63$15.6379,900
1997-05-27$15.75$15.7585,400
1997-05-23$15.81$15.8198,800
1997-05-22$15.50$15.5052,300
1997-05-21$15.38$15.38215,100
1997-05-20$15.63$15.63262,900
1997-05-19$15.88$15.8855,800
1997-05-16$15.63$15.63117,800
1997-05-15$15.88$15.88354,100
1997-05-14$15.50$15.50146,500
1997-05-13$15.25$15.25170,500
1997-05-12$16.13$16.13158,300
1997-05-09$15.88$15.88249,400
1997-05-08$15.63$15.63162,600
1997-05-07$15.88$15.88197,400
1997-05-06$17.13$17.13395,100
1997-05-05$16.88$16.88214,300
1997-05-02$15.88$15.88387,800
1997-05-01$14.88$14.88264,300
1997-04-30$14.75$14.75374,600
1997-04-29$14.50$14.50258,200
1997-04-28$13.63$13.63188,300
1997-04-25$13.75$13.7553,700
1997-04-24$13.75$13.7532,600
1997-04-23$13.88$13.8866,300
1997-04-22$14.13$14.13238,300
1997-04-21$14.00$14.00161,400
1997-04-18$14.75$14.7550,900
1997-04-17$15.13$15.1345,200
1997-04-16$14.88$14.8859,600
1997-04-15$15.00$15.00139,100
1997-04-14$14.75$14.75272,000
1997-04-11$14.13$14.13107,400
1997-04-10$14.63$14.6344,000
1997-04-09$14.38$14.38155,400
1997-04-08$14.88$14.88120,200
1997-04-07$15.00$15.00195,700
1997-04-04$14.25$14.25252,700
1997-04-03$13.94$13.94296,900
1997-04-02$14.50$14.50195,000
1997-04-01$14.88$14.88207,900
1997-03-31$15.00$15.00321,300
1997-03-27$16.25$16.2550,000
1997-03-26$16.38$16.3884,200
1997-03-25$16.13$16.1380,600
1997-03-24$16.19$16.19168,700
1997-03-21$17.00$17.0075,100
1997-03-20$16.63$16.63106,000
1997-03-19$17.25$17.25153,000
1997-03-18$17.50$17.50133,100
1997-03-17$17.75$17.7572,700
1997-03-14$17.88$17.88118,900
1997-03-13$17.75$17.7577,500
1997-03-12$17.75$17.75242,200
1997-03-11$18.25$18.25111,000
1997-03-10$18.25$18.2555,200
1997-03-07$18.38$18.38105,400
1997-03-06$18.13$18.13138,500
1997-03-05$18.63$18.63214,100
1997-03-04$17.63$17.63313,100
1997-03-03$18.88$18.88371,800
1997-02-28$19.38$19.381,181,300
1997-02-27$18.88$18.881,050,900
1997-02-26$18.63$18.63282,100
1997-02-25$18.38$18.38213,300
1997-02-24$18.75$18.75342,800
1997-02-21$18.25$18.25390,200
1997-02-20$17.63$17.63146,200
1997-02-19$17.88$17.88269,800
1997-02-18$18.00$18.00479,300
1997-02-14$16.50$16.5069,300
1997-02-13$16.75$16.75206,500
1997-02-12$16.50$16.50159,100
1997-02-11$17.13$17.13142,300
1997-02-10$16.25$16.25140,100
1997-02-07$15.88$15.8886,200
1997-02-06$16.00$16.00183,900
1997-02-05$15.63$15.63138,900
1997-02-04$16.25$16.25132,000
1997-02-03$16.25$16.25293,900
1997-01-31$16.13$16.13224,400
1997-01-30$16.13$16.13406,900
1997-01-29$16.63$16.63158,400
1997-01-28$17.00$17.00154,700
1997-01-27$17.38$17.3862,100
1997-01-24$17.75$17.7596,500
1997-01-23$17.75$17.7599,400
1997-01-22$17.75$17.75148,700
1997-01-21$18.00$18.0067,700
1997-01-20$17.88$17.88100,400
1997-01-17$18.00$18.00150,500
1997-01-16$17.88$17.88162,200
1997-01-15$17.25$17.25220,500
1997-01-14$17.63$17.63304,100
1997-01-13$17.75$17.75139,200
1997-01-10$18.50$18.50161,700
1997-01-09$18.13$18.13148,100
1997-01-08$17.75$17.7552,500
1997-01-07$17.50$17.50237,900
1997-01-06$18.00$18.00138,200
1997-01-03$18.38$18.38149,300
1997-01-02$18.00$18.0049,800