Nasdaq · FISN · stock
Deep Fission, INC. (FISN) stock price history
Every Nasdaq trading session of Deep Fission, INC. from Jun 18, 2026 to Sep 28, 2026: 70 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.
FISN adjusted close, 2026 to 2026
- $14.56
- All time high, 2026
- $15.50
- 52 week high, $5.40 low
- 70
- Daily sessions since 2026
Last updated Sep 28, 2026, the last stored session. Refreshes after each trading day. Full 2026 to 2026 series and minute bars.
FISN key facts
- Deep Fission, INC. (FISN) closed at $5.42 on Sep 28, 2026 on Nasdaq.
- FISN's all time high close is $14.56, set on Jun 18, 2026; its all time low close is $5.42 on Sep 28, 2026.
- FISN's 52 week range is $5.40 to $15.50.
- FISN's deepest drawdown was -62.8% from Jun 18, 2026 to Sep 28, 2026.
- DataCedar holds 70 daily sessions of FISN history from Jun 18, 2026 and minute bars from Jul 13, 2026, adjusted for splits and dividends, served by the API under a key.
FISN price chart, 2026 to 2026
FISN returns
Price return from the last close on or before the window start to Sep 28, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | -17.4% |
| 3 months | -49.6% |
| 6 months | n/a |
| Year to date | n/a |
| 1 year | n/a |
| 3 years | n/a |
| 5 years | n/a |
| 10 years | n/a |
| Since Jun 18, 2026 | -62.8% |
FISN records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $14.56 on Jun 18, 2026
- All time low close
- $5.42 on Sep 28, 2026
- 52 week high
- $15.50 on Jun 22, 2026
- 52 week low
- $5.40 on Sep 28, 2026
- Deepest drawdown
- -62.8% from Jun 18, 2026 to Sep 28, 2026, not yet recovered
- Best single session
- +14.4% on Sep 17, 2026
- Worst single session
- -21.5% on Jun 24, 2026
- Volatility, 1 year annualised
- 107.7%
- Sessions closing higher, 1 year
- 43%
FISN 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. 2026 starts on Jun 18, 2026; 2026 runs to Sep 28, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $16.00 | $19.00 | $5.40 | $5.42 | n/a | 24.5M | 70 |
FISN monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $5.42 | -19.2% |
| August 2026 | $6.71 | -28.7% |
| July 2026 | $9.41 | -14.8% |
| June 2026 | $11.04 | n/a |
About the FISN data
Daily bars. 70 sessions from Jun 18, 2026 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 Jun 18, 2026, 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/FISN/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Nasdaq
Common questions
FISN share price history
