Nasdaq · IONS · stock
Ionis Pharmaceuticals INC (IONS) stock price history
Every Nasdaq trading session of Ionis Pharmaceuticals INC from May 17, 1991 to Sep 28, 2026: 8,904 daily bars, adjusted for splits and dividends, with minute bars from Jul 13, 2026 forward. The full series is served by the API: a free key covers the last year, paid plans the whole history and minute bars.
IONS adjusted close, 1991 to 2026
- $86.50
- All time high, 2026
- $86.74
- 52 week high, $43.01 low
- 8,904
- Daily sessions since 1991
Last updated Sep 28, 2026, the last stored session. Refreshes after each trading day. Full 1991 to 2026 series and minute bars.
IONS key facts
- Ionis Pharmaceuticals INC (IONS) closed at $45.57 on Sep 28, 2026 on Nasdaq.
- IONS's all time high close is $86.50, set on Feb 6, 2026; its all time low close is $2.80 on Mar 18, 2003.
- IONS's 52 week range is $43.01 to $86.74.
- IONS returned -28.9% over the year to Sep 28, 2026 and +32.6% over five years.
- Over ten years IONS returned +26%, +2.3% a year compounded.
- IONS's deepest drawdown was -91.7% from Mar 6, 2000 to Mar 18, 2003.
- DataCedar holds 8,904 daily sessions of IONS history from May 17, 1991 and minute bars from Jul 13, 2026, adjusted for splits and dividends, served by the API under a key.
IONS price chart, 1991 to 2026
IONS returns
Price return from the last close on or before the window start to Sep 28, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | -25.4% |
| 3 months | -43.9% |
| 6 months | -36.8% |
| Year to date | -42.3% |
| 1 year | -28.9% |
| 3 years | -1.5% |
| 5 years | +32.6% |
| 10 years | +25.9% |
| Since May 17, 1991 | +355.7% |
| Compound annual growth, 35.4 years | +4.4% |
IONS records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $86.50 on Feb 6, 2026
- All time low close
- $2.80 on Mar 18, 2003
- 52 week high
- $86.74 on Feb 5, 2026
- 52 week low
- $43.01 on Sep 23, 2026
- Deepest drawdown
- -91.7% from Mar 6, 2000 to Mar 18, 2003, recovered Sep 19, 2013
- Best single session
- +47.7% on Aug 22, 2001
- Worst single session
- -63.9% on Dec 15, 1999
- Volatility, 1 year annualised
- 44.1%
- Sessions closing higher, 1 year
- 49%
- Growth of 1 since 1991
- 4.6×
- Best calendar year
- 2013, +282%
- Worst calendar year
- 2002, -70%
IONS price history by year
Open is the first session's open, high and low span the year, close is the last session's close, and the return is close over the previous year's close. 1991 starts on May 17, 1991; 2026 runs to Sep 28, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $79.88 | $86.74 | $43.01 | $45.57 | -42.4% | 489.7M | 185 |
| 2025 | $35.33 | $83.61 | $23.95 | $79.11 | +126.3% | 512.4M | 250 |
| 2024 | $51.41 | $54.44 | $33.33 | $34.96 | -30.9% | 340M | 252 |
| 2023 | $37.95 | $52.27 | $32.69 | $50.59 | +33.9% | 266.8M | 250 |
| 2022 | $30.73 | $48.82 | $28.25 | $37.77 | +24.1% | 266.5M | 251 |
| 2021 | $56.87 | $64.37 | $25.04 | $30.43 | -46.2% | 314M | 252 |
| 2020 | $60.89 | $64.34 | $39.32 | $56.54 | -6.4% | 242M | 253 |
| 2019 | $53.13 | $86.58 | $52.45 | $60.41 | +11.7% | 283.1M | 252 |
| 2018 | $50.08 | $59.81 | $39.07 | $54.06 | +7.5% | 278.2M | 251 |
| 2017 | $48.02 | $65.51 | $37.26 | $50.30 | +5.2% | 355.1M | 251 |
| 2016 | $61.05 | $62.68 | $19.59 | $47.83 | -22.8% | 588.2M | 252 |
| 2015 | $62.52 | $77.80 | $37.38 | $61.93 | +0.3% | 576.4M | 252 |
| 2014 | $39.79 | $67.12 | $22.25 | $61.74 | +55.0% | 581.9M | 252 |
| 2013 | $10.63 | $42.69 | $10.36 | $39.84 | +281.6% | 379.1M | 252 |
| 2012 | $7.35 | $15.61 | $7.02 | $10.44 | +44.8% | 274.3M | 250 |
| 2011 | $10.20 | $10.45 | $6.25 | $7.21 | -28.8% | 168.3M | 252 |
| 2010 | $11.24 | $11.82 | $7.59 | $10.12 | -8.9% | 304.7M | 252 |
| 2009 | $14.23 | $18.81 | $9.77 | $11.11 | -21.7% | 235.9M | 252 |
| 2008 | $15.85 | $20.15 | $9.90 | $14.18 | -10.0% | 382.5M | 253 |
| 2007 | $11.07 | $18.23 | $8.30 | $15.75 | +41.6% | 421.4M | 251 |
| 2006 | $5.29 | $14.00 | $5.09 | $11.12 | +112.2% | 231.3M | 251 |
| 2005 | $6.00 | $6.09 | $2.76 | $5.24 | -11.2% | 97.9M | 252 |
| 2004 | $6.72 | $9.90 | $4.22 | $5.90 | -9.2% | 130.6M | 252 |
| 2003 | $6.82 | $8.05 | $2.50 | $6.50 | -1.4% | 148.6M | 252 |
| 2002 | $22.38 | $22.40 | $6.00 | $6.59 | -70.3% | 160.3M | 252 |
| 2001 | $10.00 | $27.15 | $7.88 | $22.19 | +108.8% | 103.3M | 248 |
| 2000 | $6.38 | $39.00 | $5.75 | $10.63 | +70.0% | 131.1M | 252 |
| 1999 | $13.25 | $17.38 | $3.88 | $6.25 | -51.7% | 72.4M | 252 |
| 1998 | $12.56 | $16.25 | $7.00 | $12.94 | +5.1% | 54M | 252 |
| 1997 | $18.00 | $20.75 | $11.00 | $12.31 | -31.6% | 39.8M | 253 |
| 1996 | $13.13 | $24.75 | $10.38 | $18.00 | +37.1% | 64.5M | 254 |
| 1995 | $4.00 | $15.25 | $3.63 | $13.13 | +228.1% | 41.8M | 252 |
| 1994 | $6.75 | $8.38 | $3.25 | $4.00 | -40.7% | 13.4M | 252 |
| 1993 | $9.75 | $11.00 | $5.50 | $6.75 | -30.8% | 18M | 253 |
| 1992 | $13.50 | $17.00 | $5.00 | $9.75 | -29.1% | 14.9M | 254 |
| 1991 | $10.75 | $21.50 | $8.75 | $13.75 | n/a | 13.6M | 158 |
IONS monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $45.57 | -24.5% |
| August 2026 | $60.36 | +16.6% |
| July 2026 | $51.77 | -34.7% |
| June 2026 | $79.29 | +3.6% |
| May 2026 | $76.50 | +2.3% |
| April 2026 | $74.76 | -0.4% |
| March 2026 | $75.09 | -7.5% |
| February 2026 | $81.15 | -1.8% |
| January 2026 | $82.67 | +4.5% |
| December 2025 | $79.11 | -4.4% |
| November 2025 | $82.73 | +11.3% |
| October 2025 | $74.30 | +13.6% |
About the IONS data
Daily bars. 8,904 sessions from May 17, 1991 to Sep 28, 2026, one row per Nasdaq trading day with open, high, low, close and volume. Prices are adjusted for splits and cash dividends so the series is comparable across its whole length; the API also serves the raw, split only and dividend only views.
Minute bars. Stored from Jul 13, 2026 forward, most recent session Sep 25, 2026. Minute history is captured from the day collection began and is never backfilled, so this start date is exact. Five minute, fifteen minute and hourly bars are derived from these minutes.
Time and currency. Session dates are Nasdaq trading days; minute timestamps are UTC. Prices are in USD. Volume is shares traded on the session.
Get the data. The REST endpoint returns the daily series as JSON with pagination; a free key serves the last year, Quant and above the full history back to May 17, 1991, and minute bars come with the paid windows. It takes timeframe (1Min, 5Min, 15Min, 1Hour, 1Day), adjustment, start and end. See the bars endpoint and authentication, and pricing for the plan windows.
curl "https://api.datacedar.com/v3/stocks/IONS/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Nasdaq
Common questions
IONS share price history
