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 — 2019

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2019-12-31$60.41$60.41602,400——
2019-12-30$60.28$60.28749,200——
2019-12-27$60.78$60.78797,200——
2019-12-26$61.47$61.47388,500——
2019-12-24$61.87$61.87224,900——
2019-12-23$62.11$62.11694,300——
2019-12-20$61.64$61.641,197,600——
2019-12-19$61.58$61.58955,600——
2019-12-18$62.01$62.01917,500——
2019-12-17$63.93$63.931,207,400——
2019-12-16$65.27$65.271,730,400——
2019-12-13$63.05$63.051,438,400——
2019-12-12$62.22$62.224,164,800——
2019-12-11$61.69$61.69786,400——
2019-12-10$62.91$62.91639,300——
2019-12-09$63.24$63.24774,600——
2019-12-06$64.61$64.61940,500——
2019-12-05$64.53$64.53872,500——
2019-12-04$65.00$65.00883,800——
2019-12-03$64.18$64.18739,500——
2019-12-02$63.89$63.89949,400——
2019-11-29$63.96$63.96632,700——
2019-11-27$64.36$64.36909,800——
2019-11-26$63.10$63.101,025,500——
2019-11-25$63.14$63.141,037,400——
2019-11-22$61.43$61.43908,600——
2019-11-21$60.38$60.38951,300——
2019-11-20$59.69$59.691,701,200——
2019-11-19$58.09$58.09766,000——
2019-11-18$57.78$57.78751,000——
2019-11-15$58.61$58.61620,200——
2019-11-14$57.79$57.79911,000——
2019-11-13$57.63$57.63688,800——
2019-11-12$56.98$56.98637,700——
2019-11-11$56.65$56.65624,800——
2019-11-08$57.06$57.06925,100——
2019-11-07$55.35$55.351,037,100——
2019-11-06$55.60$55.601,785,800——
2019-11-05$54.39$54.39800,300——
2019-11-04$54.75$54.75694,700——
2019-11-01$55.34$55.34855,900——
2019-10-31$55.72$55.72872,300——
2019-10-30$56.72$56.721,054,100——
2019-10-29$54.73$54.731,385,600——
2019-10-28$55.46$55.461,357,900——
2019-10-25$53.89$53.891,492,800——
2019-10-24$53.85$53.85722,000——
2019-10-23$54.49$54.49943,700——
2019-10-22$54.73$54.731,253,500——
2019-10-21$55.26$55.261,228,100——
2019-10-18$55.79$55.791,227,000——
2019-10-17$56.54$56.541,784,900——
2019-10-16$57.62$57.622,232,200——
2019-10-15$61.46$61.46964,300——
2019-10-14$62.53$62.53476,400——
2019-10-11$62.74$62.74810,600——
2019-10-10$62.10$62.10774,400——
2019-10-09$59.74$59.74399,800——
2019-10-08$58.71$58.71586,000——
2019-10-07$60.11$60.11880,800——
2019-10-04$58.64$58.64603,800——
2019-10-03$58.56$58.56547,700——
2019-10-02$57.85$57.85899,300——
2019-10-01$57.14$57.14911,000——
2019-09-30$59.91$59.91833,100——
2019-09-27$59.06$59.061,058,900——
2019-09-26$59.32$59.321,142,700——
2019-09-25$61.32$61.321,078,200——
2019-09-24$61.25$61.251,085,200——
2019-09-23$61.00$61.001,228,100——
2019-09-20$62.71$62.711,597,100——
2019-09-19$62.94$62.94715,100——
2019-09-18$63.11$63.11683,500——
2019-09-17$64.78$64.78719,000——
2019-09-16$65.13$65.13882,300——
2019-09-13$66.20$66.201,903,100——
2019-09-12$66.88$66.881,460,300——
2019-09-11$64.83$64.83833,400——
2019-09-10$62.79$62.791,357,200——
2019-09-09$60.12$60.121,109,800——
2019-09-06$61.75$61.75717,700——
2019-09-05$62.76$62.76635,800——
2019-09-04$62.19$62.191,388,000——
2019-09-03$62.06$62.061,025,900——
2019-08-30$63.21$63.21614,800——
2019-08-29$64.10$64.10799,100——
2019-08-28$64.20$64.201,191,500——
2019-08-27$66.14$66.141,250,700——
2019-08-26$67.60$67.60728,800——
2019-08-23$67.96$67.961,097,600——
2019-08-22$67.85$67.851,156,000——
2019-08-21$72.15$72.15854,200——
2019-08-20$70.98$70.98980,600——
2019-08-19$70.00$70.00908,000——
2019-08-16$69.08$69.08603,500——
2019-08-15$67.48$67.48846,200——
2019-08-14$66.93$66.93845,500——
2019-08-13$67.05$67.051,256,700——
2019-08-12$68.06$68.061,340,200——
2019-08-09$68.44$68.44969,800——
2019-08-08$68.30$68.301,212,500——
2019-08-07$67.68$67.681,536,100——
2019-08-06$64.07$64.072,208,300——
2019-08-05$62.00$62.001,004,300——
2019-08-02$64.49$64.49811,500——
2019-08-01$66.07$66.07829,900——
2019-07-31$65.86$65.861,080,400——
2019-07-30$65.53$65.53986,200——
2019-07-29$64.33$64.33704,400——
2019-07-26$63.93$63.93723,000——
2019-07-25$63.00$63.00910,700——
2019-07-24$62.96$62.961,325,900——
2019-07-23$63.96$63.963,517,700——
2019-07-22$68.88$68.88952,400——
2019-07-19$68.76$68.761,325,100——
2019-07-18$70.44$70.441,311,900——
2019-07-17$67.41$67.41574,500——
2019-07-16$67.61$67.61984,500——
2019-07-15$67.86$67.861,086,900——
2019-07-12$65.52$65.52946,200——
2019-07-11$65.45$65.45808,000——
2019-07-10$65.20$65.20919,000——
2019-07-09$65.59$65.59914,400——
2019-07-08$64.02$64.02779,800——
2019-07-05$64.57$64.57742,000——
2019-07-03$65.56$65.56972,700——
2019-07-02$66.01$66.011,304,900——
2019-07-01$64.80$64.801,035,700——
2019-06-28$64.27$64.271,936,100——
2019-06-27$64.69$64.69797,000——
2019-06-26$63.59$63.59875,400——
2019-06-25$64.46$64.46659,200——
2019-06-24$63.84$63.84828,000——
2019-06-21$64.33$64.331,190,800——
2019-06-20$64.92$64.921,042,800——
2019-06-19$65.24$65.24806,400——
2019-06-18$64.90$64.90844,600——
2019-06-17$64.73$64.731,133,500——
2019-06-14$62.09$62.09902,500——
2019-06-13$63.88$63.88848,600——
2019-06-12$64.44$64.441,121,700——
2019-06-11$63.36$63.361,144,600——
2019-06-10$63.90$63.901,015,800——
2019-06-07$63.68$63.681,034,100——
2019-06-06$63.49$63.491,083,100——
2019-06-05$66.27$66.27736,700——
2019-06-04$65.57$65.571,592,300——
2019-06-03$64.91$64.911,563,200——
2019-05-31$65.60$65.601,506,100——
2019-05-30$64.72$64.721,076,700——
2019-05-29$64.42$64.421,390,500——
2019-05-28$65.04$65.048,094,400——
2019-05-24$64.72$64.722,588,000——
2019-05-23$67.14$67.141,265,600——
2019-05-22$68.56$68.561,236,100——
2019-05-21$69.24$69.241,022,700——
2019-05-20$67.46$67.461,092,500——
2019-05-17$67.40$67.401,013,400——
2019-05-16$67.78$67.78988,300——
2019-05-15$66.55$66.551,163,600——
2019-05-14$66.74$66.741,687,300——
2019-05-13$66.55$66.551,425,200——
2019-05-10$69.28$69.281,401,300——
2019-05-09$67.36$67.362,001,600——
2019-05-08$68.65$68.655,360,900——
2019-05-07$67.62$67.622,450,500——
2019-05-06$72.74$72.741,153,500——
2019-05-03$73.46$73.461,177,700——
2019-05-02$72.21$72.211,577,300——
2019-05-01$73.57$73.57720,300——
2019-04-30$74.33$74.33935,400——
2019-04-29$74.38$74.38889,700——
2019-04-26$74.73$74.73956,700——
2019-04-25$73.86$73.861,008,000——
2019-04-24$73.33$73.331,665,400——
2019-04-23$75.00$75.001,110,400——
2019-04-22$72.64$72.641,130,200——
2019-04-18$72.99$72.992,181,800——
2019-04-17$72.67$72.673,767,700——
2019-04-16$83.28$83.281,196,300——
2019-04-15$83.88$83.881,000,800——
2019-04-12$84.61$84.61680,000——
2019-04-11$83.76$83.76891,300——
2019-04-10$85.62$85.62909,100——
2019-04-09$83.72$83.721,114,000——
2019-04-08$86.14$86.141,274,600——
2019-04-05$84.99$84.991,381,100——
2019-04-04$82.15$82.151,155,000——
2019-04-03$84.89$84.892,015,700——
2019-04-02$81.74$81.74876,700——
2019-04-01$81.31$81.31893,500——
2019-03-29$81.17$81.17893,000——
2019-03-28$79.75$79.751,126,600——
2019-03-27$77.03$77.031,331,000——
2019-03-26$80.18$80.18931,400——
2019-03-25$79.04$79.04906,500——
2019-03-22$78.90$78.90790,900——
2019-03-21$80.50$80.501,579,200——
2019-03-20$80.21$80.21930,400——
2019-03-19$79.61$79.611,172,900——
2019-03-18$79.52$79.521,364,300——
2019-03-15$78.54$78.541,288,400——
2019-03-14$77.44$77.441,224,000——
2019-03-13$76.61$76.611,287,600——
2019-03-12$74.88$74.881,115,900——
2019-03-11$73.92$73.921,375,400——
2019-03-08$70.46$70.461,151,500——
2019-03-07$69.81$69.81786,100——
2019-03-06$69.18$69.18937,000——
2019-03-05$71.22$71.221,328,600——
2019-03-04$70.49$70.491,106,400——
2019-03-01$69.69$69.691,711,300——
2019-02-28$70.99$70.991,848,300——
2019-02-27$70.94$70.944,747,400——
2019-02-26$61.62$61.621,026,400——
2019-02-25$61.67$61.671,497,400——
2019-02-22$58.76$58.76414,500——
2019-02-21$57.41$57.41525,900——
2019-02-20$58.37$58.37452,000——
2019-02-19$58.54$58.54487,300——
2019-02-15$58.98$58.98617,100——
2019-02-14$58.87$58.87503,100——
2019-02-13$60.55$60.55821,000——
2019-02-12$59.67$59.67719,700——
2019-02-11$59.10$59.10675,900——
2019-02-08$58.73$58.73596,900——
2019-02-07$58.03$58.03764,500——
2019-02-06$58.05$58.05530,800——
2019-02-05$58.26$58.26520,600——
2019-02-04$59.01$59.01607,800——
2019-02-01$58.49$58.49693,200——
2019-01-31$58.00$58.00818,900——
2019-01-30$55.92$55.92750,900——
2019-01-29$54.55$54.551,082,200——
2019-01-28$56.96$56.96773,200——
2019-01-25$58.74$58.74844,000——
2019-01-24$57.05$57.05906,700——
2019-01-23$57.21$57.21800,700——
2019-01-22$57.44$57.44782,700——
2019-01-18$58.03$58.031,241,200——
2019-01-17$57.60$57.60694,700——
2019-01-16$57.18$57.18583,800——
2019-01-15$58.26$58.26727,200——
2019-01-14$56.39$56.39613,300——
2019-01-11$57.80$57.80610,900——
2019-01-10$57.34$57.34884,400——
2019-01-09$57.21$57.21653,100——
2019-01-08$57.20$57.201,205,800——
2019-01-07$56.81$56.811,099,100——
2019-01-04$54.33$54.332,567,600——
2019-01-03$52.92$52.92859,200——
2019-01-02$53.77$53.77902,000——