Nasdaq · SION · stock
Sionna Therapeutics, Inc. (SION) stock price history
Every Nasdaq trading session of Sionna Therapeutics, Inc. from Feb 7, 2025 to Sep 28, 2026: 411 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.
SION adjusted close, 2025 to 2026
- $51.04
- All time high, 2026
- $54.97
- 52 week high, $4.01 low
- 411
- Daily sessions since 2025
Last updated Sep 28, 2026, the last stored session. Refreshes after each trading day. Full 2025 to 2026 series and minute bars.
SION key facts
- Sionna Therapeutics, Inc. (SION) closed at $5.12 on Sep 28, 2026 on Nasdaq.
- SION's all time high close is $51.04, set on Aug 7, 2026; its all time low close is $4.50 on Aug 10, 2026.
- SION's 52 week range is $4.01 to $54.97.
- SION returned -82.3% over the year to Sep 28, 2026.
- Since Feb 7, 2025 SION returned -80%, -62.0% a year compounded.
- SION's deepest drawdown was -91.2% from Aug 7, 2026 to Aug 10, 2026.
- DataCedar holds 411 daily sessions of SION history from Feb 7, 2025 and minute bars from Jul 13, 2026, adjusted for splits and dividends, served by the API under a key.
SION price chart, 2025 to 2026
SION returns
Price return from the last close on or before the window start to Sep 28, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | -12.8% |
| 3 months | -87.9% |
| 6 months | -85.8% |
| Year to date | -87.6% |
| 1 year | -82.3% |
| 3 years | n/a |
| 5 years | n/a |
| 10 years | n/a |
| Since Feb 7, 2025 | -79.5% |
| Compound annual growth, 1.6 years | -62.0% |
SION records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $51.04 on Aug 7, 2026
- All time low close
- $4.50 on Aug 10, 2026
- 52 week high
- $54.97 on Aug 7, 2026
- 52 week low
- $4.01 on Aug 10, 2026
- Deepest drawdown
- -91.2% from Aug 7, 2026 to Aug 10, 2026, not yet recovered
- Best single session
- +32.0% on Oct 21, 2025
- Worst single session
- -91.2% on Aug 10, 2026
- Volatility, 1 year annualised
- 257.2%
- Sessions closing higher, 1 year
- 58%
SION 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. 2025 starts on Feb 7, 2025; 2026 runs to Sep 28, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $41.46 | $54.97 | $4.01 | $5.12 | -87.6% | 179.5M | 185 |
| 2025 | $25.00 | $45.00 | $7.26 | $41.14 | n/a | 55M | 226 |
SION monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $5.12 | -15.1% |
| August 2026 | $6.03 | -87.2% |
| July 2026 | $47.13 | +7.1% |
| June 2026 | $43.99 | +2.7% |
| May 2026 | $42.82 | +10.6% |
| April 2026 | $38.70 | -3.5% |
| March 2026 | $40.09 | +9.7% |
| February 2026 | $36.54 | -13.5% |
| January 2026 | $42.26 | +2.7% |
| December 2025 | $41.14 | -5.6% |
| November 2025 | $43.57 | +14.0% |
| October 2025 | $38.21 | +29.9% |
About the SION data
Daily bars. 411 sessions from Feb 7, 2025 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 28, 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 Feb 7, 2025, 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/SION/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Nasdaq
Common questions
SION share price history
