Nasdaq · QUMSU · stock
Quantumsphere Acquisition Corp (QUMSU) stock price history
Every Nasdaq trading session of Quantumsphere Acquisition Corp from Aug 6, 2025 to Sep 25, 2026: 287 daily bars, adjusted for splits and dividends, with minute bars from Jul 21, 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.
QUMSU adjusted close, 2025 to 2026
- $10.50
- All time high, 2026
- $10.99
- 52 week high, $10.07 low
- 287
- Daily sessions since 2025
Last updated Sep 25, 2026, the last stored session. Refreshes after each trading day. Full 2025 to 2026 series and minute bars.
QUMSU key facts
- Quantumsphere Acquisition Corp (QUMSU) closed at $10.38 on Sep 25, 2026 on Nasdaq.
- QUMSU's all time high close is $10.50, set on Jun 23, 2026; its all time low close is $10.02 on Aug 6, 2025.
- QUMSU's 52 week range is $10.07 to $10.99.
- QUMSU returned +2.9% over the year to Sep 25, 2026.
- Since Aug 6, 2025 QUMSU returned +4%, +3.2% a year compounded.
- QUMSU's deepest drawdown was -1.6% from Jun 26, 2026 to Jun 29, 2026.
- DataCedar holds 287 daily sessions of QUMSU history from Aug 6, 2025 and minute bars from Jul 21, 2026, adjusted for splits and dividends, served by the API under a key.
QUMSU price chart, 2025 to 2026
QUMSU returns
Price return from the last close on or before the window start to Sep 25, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | +0.5% |
| 3 months | -1.1% |
| 6 months | +0.6% |
| Year to date | +2.0% |
| 1 year | +2.9% |
| 3 years | n/a |
| 5 years | n/a |
| 10 years | n/a |
| Since Aug 6, 2025 | +3.6% |
| Compound annual growth, 1.1 years | +3.2% |
QUMSU records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $10.50 on Jun 23, 2026
- All time low close
- $10.02 on Aug 6, 2025
- 52 week high
- $10.99 on Jun 10, 2026
- 52 week low
- $10.07 on Sep 25, 2025
- Deepest drawdown
- -1.6% from Jun 26, 2026 to Jun 29, 2026, not yet recovered
- Best single session
- +2.2% on Mar 16, 2026
- Worst single session
- -1.6% on Jun 29, 2026
- Volatility, 1 year annualised
- 4.3%
- Sessions closing higher, 1 year
- 8%
QUMSU 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 Aug 6, 2025; 2026 runs to Sep 25, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $10.18 | $10.99 | $10.10 | $10.38 | +2.0% | 26.1K | 184 |
| 2025 | $10.02 | $10.27 | $10.02 | $10.18 | n/a | 4.4M | 103 |
QUMSU monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $10.38 | +0.5% |
| August 2026 | $10.33 | 0.0% |
| July 2026 | $10.33 | 0.0% |
| June 2026 | $10.33 | -0.1% |
| May 2026 | $10.34 | -0.1% |
| April 2026 | $10.35 | +0.3% |
| March 2026 | $10.32 | +0.8% |
| February 2026 | $10.24 | +0.2% |
| January 2026 | $10.22 | +0.4% |
| December 2025 | $10.18 | +0.3% |
| November 2025 | $10.15 | -1.1% |
| October 2025 | $10.26 | +1.3% |
About the QUMSU data
Daily bars. 287 sessions from Aug 6, 2025 to Sep 25, 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 21, 2026 forward, most recent session Sep 10, 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 Aug 6, 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/QUMSU/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Nasdaq
Common questions
QUMSU share price history
