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 — 1998

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1998-12-31$12.94$12.94179,100
1998-12-30$12.50$12.50154,900
1998-12-29$13.00$13.00345,800
1998-12-28$12.13$12.13367,100
1998-12-24$11.63$11.63100,000
1998-12-23$11.44$11.44157,500
1998-12-22$11.38$11.38183,100
1998-12-21$11.25$11.25200,400
1998-12-18$11.00$11.00149,200
1998-12-17$10.94$10.94112,900
1998-12-16$10.75$10.75179,300
1998-12-15$10.69$10.69144,400
1998-12-14$10.88$10.88134,600
1998-12-11$11.38$11.38118,800
1998-12-10$11.56$11.56100,200
1998-12-09$12.00$12.00137,000
1998-12-08$11.75$11.75111,800
1998-12-07$12.00$12.00163,600
1998-12-04$11.50$11.50142,700
1998-12-03$11.69$11.69133,400
1998-12-02$11.56$11.56197,000
1998-12-01$11.19$11.1994,200
1998-11-30$11.38$11.38236,800
1998-11-27$11.50$11.50293,900
1998-11-25$10.25$10.25101,500
1998-11-24$10.63$10.63147,900
1998-11-23$10.75$10.75166,400
1998-11-20$11.00$11.0085,100
1998-11-19$11.13$11.13113,800
1998-11-18$11.00$11.0050,400
1998-11-17$11.00$11.00167,300
1998-11-16$11.00$11.00150,700
1998-11-13$11.06$11.06125,000
1998-11-12$11.63$11.63127,500
1998-11-11$11.25$11.25113,800
1998-11-10$11.00$11.00133,900
1998-11-09$11.88$11.88327,400
1998-11-06$11.94$11.94483,600
1998-11-05$11.00$11.00294,700
1998-11-04$10.44$10.44189,000
1998-11-03$10.44$10.44288,900
1998-11-02$10.31$10.31397,200
1998-10-30$9.63$9.63189,600
1998-10-29$9.50$9.50480,100
1998-10-28$9.81$9.81412,500
1998-10-27$10.44$10.44305,700
1998-10-26$11.31$11.31388,700
1998-10-23$10.25$10.25128,900
1998-10-22$10.13$10.1387,500
1998-10-21$9.75$9.7575,200
1998-10-20$9.81$9.81208,400
1998-10-19$9.88$9.88167,100
1998-10-16$9.69$9.69138,500
1998-10-15$9.50$9.50113,100
1998-10-14$9.50$9.50125,000
1998-10-13$9.38$9.38143,300
1998-10-12$10.31$10.31275,300
1998-10-09$9.69$9.69368,700
1998-10-08$9.50$9.50410,800
1998-10-07$9.81$9.81220,300
1998-10-06$10.25$10.25286,600
1998-10-05$9.25$9.25373,700
1998-10-02$10.94$10.94302,100
1998-10-01$9.75$9.75197,800
1998-09-30$11.38$11.38127,400
1998-09-29$12.19$12.19157,000
1998-09-28$12.00$12.00175,300
1998-09-25$11.50$11.5098,000
1998-09-24$11.38$11.38101,200
1998-09-23$12.00$12.00245,300
1998-09-22$11.75$11.75276,200
1998-09-21$10.50$10.50104,200
1998-09-18$10.38$10.3884,200
1998-09-17$10.00$10.00264,800
1998-09-16$10.44$10.44139,700
1998-09-15$10.38$10.38168,900
1998-09-14$10.75$10.75442,300
1998-09-11$9.50$9.50198,200
1998-09-10$9.00$9.00147,300
1998-09-09$9.38$9.38397,500
1998-09-08$9.75$9.75252,100
1998-09-04$8.88$8.88257,500
1998-09-03$8.44$8.44229,300
1998-09-02$8.56$8.56440,200
1998-09-01$7.06$7.06687,300
1998-08-31$7.25$7.25499,200
1998-08-28$8.75$8.75578,100
1998-08-27$9.81$9.811,166,600
1998-08-26$9.25$9.25163,300
1998-08-25$9.94$9.9474,400
1998-08-24$10.25$10.25130,100
1998-08-21$10.63$10.63350,700
1998-08-20$11.13$11.1370,900
1998-08-19$11.25$11.25112,100
1998-08-18$11.44$11.4463,400
1998-08-17$11.50$11.50122,000
1998-08-14$11.38$11.38139,900
1998-08-13$11.63$11.6388,800
1998-08-12$12.00$12.00179,700
1998-08-11$11.50$11.50181,200
1998-08-10$11.88$11.8883,700
1998-08-07$12.06$12.06159,800
1998-08-06$12.50$12.50194,600
1998-08-05$11.88$11.88165,400
1998-08-04$11.75$11.75197,600
1998-08-03$12.19$12.19218,600
1998-07-31$12.00$12.00177,600
1998-07-30$13.50$13.50119,100
1998-07-29$13.25$13.25200,100
1998-07-28$12.38$12.38179,600
1998-07-27$12.94$12.94165,800
1998-07-24$13.56$13.56597,300
1998-07-23$14.19$14.192,440,300
1998-07-22$13.44$13.440
1998-07-21$13.44$13.44296,400
1998-07-20$14.25$14.25272,500
1998-07-17$13.81$13.81156,900
1998-07-16$13.75$13.7578,400
1998-07-15$14.06$14.0690,900
1998-07-14$13.88$13.8840,500
1998-07-13$13.94$13.9481,700
1998-07-10$14.00$14.0058,400
1998-07-09$14.00$14.0079,700
1998-07-08$14.31$14.31290,700
1998-07-07$14.00$14.00186,700
1998-07-06$12.63$12.63188,400
1998-07-02$12.63$12.63161,300
1998-07-01$13.25$13.25146,200
1998-06-30$13.69$13.69199,900
1998-06-29$13.88$13.88328,400
1998-06-26$12.88$12.88257,900
1998-06-25$11.75$11.75148,400
1998-06-24$12.06$12.06102,700
1998-06-23$12.13$12.13141,500
1998-06-22$11.94$11.9470,000
1998-06-19$12.13$12.13146,300
1998-06-18$12.13$12.13112,900
1998-06-17$12.25$12.25147,000
1998-06-16$12.13$12.13132,700
1998-06-15$12.00$12.00174,100
1998-06-12$12.63$12.63147,700
1998-06-11$12.69$12.69233,500
1998-06-10$13.06$13.06140,900
1998-06-09$13.19$13.19213,400
1998-06-08$13.06$13.06295,700
1998-06-05$13.50$13.5045,000
1998-06-04$13.50$13.5044,100
1998-06-03$13.69$13.6950,600
1998-06-02$13.69$13.6978,800
1998-06-01$13.63$13.63140,700
1998-05-29$13.88$13.8897,200
1998-05-28$14.00$14.00109,300
1998-05-27$13.38$13.38124,800
1998-05-26$13.75$13.75105,400
1998-05-22$14.50$14.50154,000
1998-05-21$14.44$14.44400,600
1998-05-20$14.75$14.75117,600
1998-05-19$14.88$14.88535,800
1998-05-18$15.13$15.13200,500
1998-05-15$14.63$14.6389,100
1998-05-14$14.78$14.7861,700
1998-05-13$15.13$15.1387,500
1998-05-12$15.19$15.19164,000
1998-05-11$14.81$14.81572,700
1998-05-08$15.00$15.00191,600
1998-05-07$13.94$13.9468,700
1998-05-06$14.06$14.06127,200
1998-05-05$14.31$14.3188,700
1998-05-04$14.31$14.31160,500
1998-05-01$14.19$14.1978,400
1998-04-30$14.25$14.2585,100
1998-04-29$14.13$14.1363,600
1998-04-28$13.88$13.8882,600
1998-04-27$13.25$13.25242,100
1998-04-24$13.94$13.94115,500
1998-04-23$14.06$14.06116,700
1998-04-22$14.25$14.25192,700
1998-04-21$14.25$14.25187,900
1998-04-20$14.69$14.69112,800
1998-04-17$14.56$14.56189,400
1998-04-16$14.44$14.44273,000
1998-04-15$15.38$15.38133,500
1998-04-14$15.50$15.50155,100
1998-04-13$15.38$15.38182,000
1998-04-09$15.44$15.44444,500
1998-04-08$15.31$15.31270,900
1998-04-07$15.38$15.38197,000
1998-04-06$15.44$15.44140,100
1998-04-03$15.69$15.6980,800
1998-04-02$15.69$15.69118,400
1998-04-01$15.31$15.3189,100
1998-03-31$15.25$15.2571,400
1998-03-30$15.19$15.19103,000
1998-03-27$15.44$15.44104,700
1998-03-26$15.25$15.2586,400
1998-03-25$15.44$15.44148,200
1998-03-24$15.13$15.1394,700
1998-03-23$15.00$15.00134,200
1998-03-20$15.00$15.00211,100
1998-03-19$14.88$14.8880,500
1998-03-18$14.94$14.94138,100
1998-03-17$14.81$14.81269,300
1998-03-16$15.25$15.25313,000
1998-03-13$15.13$15.13407,200
1998-03-12$14.25$14.25134,200
1998-03-11$13.94$13.94132,700
1998-03-10$13.81$13.81132,900
1998-03-09$13.63$13.6381,500
1998-03-06$13.50$13.50110,100
1998-03-05$13.44$13.44120,700
1998-03-04$13.75$13.75214,200
1998-03-03$13.63$13.63127,100
1998-03-02$13.69$13.6984,600
1998-02-27$13.44$13.4461,100
1998-02-26$13.50$13.5076,700
1998-02-25$13.69$13.69228,700
1998-02-24$13.13$13.13142,700
1998-02-23$12.75$12.75369,400
1998-02-20$13.00$13.00143,000
1998-02-19$13.27$13.27127,200
1998-02-18$13.38$13.38123,000
1998-02-17$13.31$13.31202,700
1998-02-13$13.50$13.50218,800
1998-02-12$13.94$13.94224,700
1998-02-11$14.13$14.13132,100
1998-02-10$14.38$14.38182,900
1998-02-09$14.63$14.63186,200
1998-02-06$14.50$14.501,381,000
1998-02-05$14.75$14.752,432,900
1998-02-04$14.00$14.00153,600
1998-02-03$14.13$14.13185,300
1998-02-02$14.06$14.06228,900
1998-01-30$13.75$13.75132,100
1998-01-29$14.13$14.13141,700
1998-01-28$14.13$14.1397,700
1998-01-27$14.13$14.13138,000
1998-01-26$14.13$14.13439,700
1998-01-23$14.06$14.06355,400
1998-01-22$13.50$13.50172,000
1998-01-21$13.88$13.8871,300
1998-01-20$14.13$14.13238,200
1998-01-16$13.69$13.69318,300
1998-01-15$13.88$13.88146,700
1998-01-14$14.88$14.8879,200
1998-01-13$15.31$15.31275,800
1998-01-12$15.31$15.31235,500
1998-01-09$15.50$15.50424,500
1998-01-08$15.44$15.44152,700
1998-01-07$15.38$15.38221,500
1998-01-06$15.13$15.13379,000
1998-01-05$14.00$14.00444,200
1998-01-02$12.63$12.6389,600