Nasdaq · ATIIU · stock
Archimedes Tech SPAC Partners II Co. (ATIIU) stock price history
Every Nasdaq trading session of Archimedes Tech SPAC Partners II Co. from Feb 11, 2025 to Sep 25, 2026: 408 daily bars, adjusted for splits and dividends, with minute bars from Jul 20, 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.
ATIIU adjusted close, 2025 to 2026
- $16.15
- All time high, 2026
- $50.99
- 52 week high, $10.31 low
- 408
- 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.
ATIIU key facts
- Archimedes Tech SPAC Partners II Co. (ATIIU) closed at $11.30 on Sep 25, 2026 on Nasdaq.
- ATIIU's all time high close is $16.15, set on May 26, 2026; its all time low close is $10.01 on Apr 10, 2025.
- ATIIU's 52 week range is $10.31 to $50.99.
- ATIIU returned +9.6% over the year to Sep 25, 2026.
- Since Feb 11, 2025 ATIIU returned +13%, +7.6% a year compounded.
- ATIIU's deepest drawdown was -31.6% from May 26, 2026 to Jun 17, 2026.
- DataCedar holds 408 daily sessions of ATIIU history from Feb 11, 2025 and minute bars from Jul 20, 2026, adjusted for splits and dividends, served by the API under a key.
ATIIU price chart, 2025 to 2026
ATIIU returns
Price return from the last close on or before the window start to Sep 25, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | -0.8% |
| 3 months | -3.9% |
| 6 months | +3.7% |
| Year to date | +7.6% |
| 1 year | +9.6% |
| 3 years | n/a |
| 5 years | n/a |
| 10 years | n/a |
| Since Feb 11, 2025 | +12.5% |
| Compound annual growth, 1.6 years | +7.6% |
ATIIU records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- $16.15 on May 26, 2026
- All time low close
- $10.01 on Apr 10, 2025
- 52 week high
- $50.99 on May 26, 2026
- 52 week low
- $10.31 on Sep 25, 2025
- Deepest drawdown
- -31.6% from May 26, 2026 to Jun 17, 2026, not yet recovered
- Best single session
- +23.2% on May 26, 2026
- Worst single session
- -21.0% on May 27, 2026
- Volatility, 1 year annualised
- 49.4%
- Sessions closing higher, 1 year
- 8%
ATIIU 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 11, 2025; 2026 runs to Sep 25, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | $10.50 | $50.99 | $10.50 | $11.30 | +7.6% | 200.7K | 184 |
| 2025 | $10.03 | $12.57 | $10.01 | $10.50 | n/a | 12.1M | 224 |
ATIIU monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | $11.30 | 0.0% |
| August 2026 | $11.30 | +0.6% |
| July 2026 | $11.23 | -6.3% |
| June 2026 | $11.99 | -2.6% |
| May 2026 | $12.31 | +6.5% |
| April 2026 | $11.56 | +6.1% |
| March 2026 | $10.90 | -0.3% |
| February 2026 | $10.93 | 0.0% |
| January 2026 | $10.93 | +4.1% |
| December 2025 | $10.50 | 0.0% |
| November 2025 | $10.50 | -2.3% |
| October 2025 | $10.75 | -14.5% |
About the ATIIU data
Daily bars. 408 sessions from Feb 11, 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 20, 2026 forward, most recent session Sep 23, 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 11, 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/ATIIU/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Nasdaq
Common questions
ATIIU share price history
