Archimedes Tech SPAC Partners II Unit Stock Price History

NASDAQ: ATIIUFinanceBlank ChecksUSD

11.24-0.03 (-0.27%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

ATIIU price history at a glance

The price history for Archimedes Tech SPAC Partners II Unit (ATIIU) on this page begins on February 10, 2025, when the stock closed at $10.03; it most recently closed at $11.24 on October 5, 2026. The highest price in this record is $50.99, reached on May 25, 2026; the latest close is 78.0% below that peak. In the last 12 months alone, ATIIU has gained 5.2%.

Prices are split-adjusted closing prices; daily open, high, low, close and volume for the past year are listed below.

Summary generated from market data by MetaCap's automated system. Methodology

Key price levels

High since 2025: $50.99
Date of high: May 25, 2026
Low since 2025: $10.01
Date of low: Apr 7, 2025
52-week high: $50.99
52-week low: $10.50
IPO year: 2025
Last close: $11.24

ATIIU returns

1 week

-0.79%

1 month

-0.53%

3 months

-3.93%

6 months

+6.74%

Year to date

+7.05%

1 year

+5.24%

ATIIU price return, excluding dividends.

ATIIU annual returns

Calendar-year price returns
Year	First close	Year-end close	High	Low	Return
2026	10.50	11.24	50.99	10.50	+7.05%
2025*	10.03	10.50	12.57	10.01	+4.69%

* Partial year: the record begins after the start of 2025; return measured from the first available close.

2026 return is year to date.

ATIIU daily prices (past year)

Daily open, high, low, close and volume
Date	Open	High	Low	Close	Change	Volume
Oct 9, 2026	11.19	11.24	11.19	11.24	+0.54%	904
Oct 8, 2026	11.13	11.18	11.18	11.18	-0.80%	299
Oct 7, 2026	11.36	11.36	11.27	11.27	-0.53%	1.12K
Oct 6, 2026	11.33	11.33	11.33	11.33	0.00%	0
Oct 5, 2026	11.33	11.33	11.33	11.33	0.00%	0
Oct 2, 2026	11.33	11.33	11.33	11.33	0.00%	0
Oct 1, 2026	11.33	11.33	11.33	11.33	0.00%	0
Sep 30, 2026	11.30	11.33	11.30	11.33	+0.27%	1.10K
Sep 29, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 28, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 25, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 24, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 23, 2026	11.30	11.30	11.30	11.30	0.00%	100
Sep 22, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 21, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 18, 2026	11.30	11.30	11.30	11.30	0.00%	200
Sep 17, 2026	11.30	11.30	11.30	11.30	0.00%	100
Sep 16, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 15, 2026	11.30	11.30	11.30	11.30	-1.80%	100
Sep 14, 2026	11.51	11.51	11.51	11.51	0.00%	0
Sep 11, 2026	11.48	11.51	11.48	11.51	+1.83%	200
Sep 10, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 9, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 8, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 4, 2026	11.30	11.30	11.30	11.30	0.00%	100
Sep 3, 2026	11.30	11.30	11.30	11.30	0.00%	0
Sep 2, 2026	11.30	11.30	11.30	11.30	-0.09%	100
Sep 1, 2026	11.31	11.31	11.31	11.31	+0.09%	100
Aug 31, 2026	11.30	11.30	11.30	11.30	0.00%	0
Aug 28, 2026	11.38	11.38	11.30	11.30	-0.79%	700
Aug 27, 2026	11.39	11.39	11.39	11.39	0.00%	500
Aug 26, 2026	11.39	11.39	11.39	11.39	0.00%	0
Aug 25, 2026	11.39	11.39	11.39	11.39	+0.71%	400
Aug 24, 2026	11.31	11.31	11.31	11.31	-0.70%	100
Aug 21, 2026	11.35	11.39	11.35	11.39	-0.74%	7.10K
Aug 20, 2026	11.48	11.48	11.48	11.48	0.00%	0
Aug 19, 2026	11.48	11.48	11.48	11.48	0.00%	0
Aug 18, 2026	11.48	11.48	11.48	11.48	0.00%	0
Aug 17, 2026	11.48	11.48	11.48	11.48	0.00%	0
Aug 14, 2026	11.48	11.48	11.48	11.48	0.00%	0
Aug 13, 2026	11.48	11.48	11.48	11.48	-1.08%	500
Aug 12, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 11, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 10, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 7, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 6, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 5, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 4, 2026	11.60	11.60	11.60	11.60	0.00%	0
Aug 3, 2026	11.60	11.60	11.60	11.60	+3.29%	500
Jul 31, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 30, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 29, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 28, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 27, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 24, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 23, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 22, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 21, 2026	11.23	11.23	11.23	11.23	0.00%	0
Jul 20, 2026	11.61	11.61	11.23	11.23	-3.27%	1.10K
Jul 17, 2026	11.61	11.61	11.61	11.61	0.00%	0
Jul 16, 2026	11.61	11.61	11.61	11.61	-0.77%	300
Jul 15, 2026	11.70	11.70	11.70	11.70	0.00%	0
Jul 14, 2026	11.70	11.70	11.70	11.70	0.00%	0
Jul 13, 2026	11.70	11.70	11.70	11.70	0.00%	0
Jul 10, 2026	11.71	11.71	11.70	11.70	-2.50%	14.00K
Jul 9, 2026	12.00	12.00	12.00	12.00	0.00%	0
Jul 8, 2026	12.00	12.00	12.00	12.00	+1.69%	200
Jul 7, 2026	11.90	11.90	11.80	11.80	+1.64%	400
Jul 6, 2026	11.61	11.61	11.61	11.61	0.00%	0
Jul 2, 2026	11.61	11.61	11.61	11.61	0.00%	0
Jul 1, 2026	11.71	11.71	11.61	11.61	-3.17%	900
Jun 30, 2026	11.99	11.99	11.99	11.99	0.00%	0
Jun 29, 2026	11.99	11.99	11.99	11.99	0.00%	0
Jun 26, 2026	12.00	12.00	11.99	11.99	+1.96%	300
Jun 25, 2026	11.76	11.76	11.76	11.76	0.00%	0
Jun 24, 2026	12.00	13.29	11.60	11.76	-1.09%	16.70K
Jun 23, 2026	11.90	12.58	11.54	11.89	+7.70%	8.70K
Jun 22, 2026	11.04	11.04	11.04	11.04	0.00%	0
Jun 18, 2026	11.04	11.04	11.04	11.04	0.00%	0
Jun 17, 2026	12.04	12.04	11.04	11.04	-13.14%	200
Jun 16, 2026	12.71	12.71	12.71	12.71	0.00%	0
Jun 15, 2026	12.71	12.71	12.71	12.71	+6.81%	100
Jun 12, 2026	11.90	11.90	11.90	11.90	0.00%	0
Jun 11, 2026	11.90	11.90	11.90	11.90	-0.42%	200
Jun 10, 2026	11.95	11.95	11.95	11.95	0.00%	0
Jun 9, 2026	11.21	12.71	11.21	11.95	-1.24%	3.90K
Jun 8, 2026	12.10	12.10	12.10	12.10	+1.51%	300
Jun 5, 2026	12.25	12.25	11.92	11.92	-4.26%	1.10K
Jun 4, 2026	12.45	12.45	12.45	12.45	0.00%	0
Jun 3, 2026	12.45	12.45	12.45	12.45	0.00%	0
Jun 2, 2026	12.45	12.45	12.45	12.45	-1.27%	900
Jun 1, 2026	12.50	13.70	12.50	12.61	+2.45%	3.10K
May 29, 2026	12.40	12.40	12.08	12.31	-0.89%	6.10K
May 28, 2026	12.40	12.43	12.40	12.42	-2.70%	1.40K
May 27, 2026	16.14	17.50	12.77	12.77	-20.96%	28.10K
May 26, 2026	50.99	50.99	13.21	16.15	+23.19%	18.40K
May 22, 2026	12.96	13.11	12.96	13.11	-0.30%	700
May 21, 2026	15.00	15.00	12.40	13.15	-5.46%	9.20K
May 20, 2026	13.00	14.98	12.40	13.91	+7.74%	2.60K
May 19, 2026	12.91	12.91	12.91	12.91	0.00%	0
May 18, 2026	12.91	12.91	12.91	12.91	0.00%	0
May 15, 2026	12.91	12.91	12.91	12.91	0.00%	0
May 14, 2026	12.91	12.91	12.91	12.91	0.00%	0
May 13, 2026	12.32	13.00	12.32	12.91	+15.28%	1.00K
May 12, 2026	11.20	11.20	11.20	11.20	0.00%	0
May 11, 2026	11.20	11.20	11.20	11.20	0.00%	0
May 8, 2026	11.20	11.20	11.20	11.20	0.00%	0
May 7, 2026	11.20	11.20	11.20	11.20	-3.11%	200
May 6, 2026	11.56	11.56	11.56	11.56	0.00%	0
May 5, 2026	11.56	11.56	11.56	11.56	0.00%	0
May 4, 2026	11.56	11.56	11.56	11.56	0.00%	0
May 1, 2026	11.56	11.56	11.56	11.56	0.00%	0
Apr 30, 2026	11.56	11.56	11.56	11.56	0.00%	0
Apr 29, 2026	11.56	11.56	11.56	11.56	0.00%	0
Apr 28, 2026	11.56	11.56	11.56	11.56	0.00%	0
Apr 27, 2026	11.56	11.56	11.56	11.56	0.00%	0
Apr 24, 2026	11.60	11.60	11.56	11.56	+2.76%	900
Apr 23, 2026	11.25	11.25	11.25	11.25	0.00%	0
Apr 22, 2026	11.25	11.25	11.25	11.25	0.00%	0
Apr 21, 2026	10.70	11.77	10.70	11.25	+6.84%	3.40K
Apr 20, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 17, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 16, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 15, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 14, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 13, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 10, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 9, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 8, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 7, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 6, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 2, 2026	10.53	10.53	10.53	10.53	0.00%	0
Apr 1, 2026	10.53	10.53	10.53	10.53	-3.39%	200
Mar 31, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 30, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 27, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 26, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 25, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 24, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 23, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 20, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 19, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 18, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 17, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 16, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 13, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 12, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 11, 2026	10.90	10.90	10.90	10.90	0.00%	0
Mar 10, 2026	10.51	11.48	10.51	10.90	-0.27%	36.20K
Mar 9, 2026	10.93	10.93	10.93	10.93	0.00%	0
Mar 6, 2026	10.93	10.93	10.93	10.93	0.00%	0
Mar 5, 2026	10.93	10.93	10.93	10.93	0.00%	0
Mar 4, 2026	10.93	10.93	10.93	10.93	0.00%	0
Mar 3, 2026	10.93	10.93	10.93	10.93	0.00%	0
Mar 2, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 27, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 26, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 25, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 24, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 23, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 20, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 19, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 18, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 17, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 13, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 12, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 11, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 10, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 9, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 6, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 5, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 4, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 3, 2026	10.93	10.93	10.93	10.93	0.00%	0
Feb 2, 2026	10.93	10.93	10.93	10.93	0.00%	0
Jan 30, 2026	10.93	10.93	10.93	10.93	-0.64%	1.30K
Jan 29, 2026	11.00	11.00	11.00	11.00	0.00%	700
Jan 28, 2026	11.00	11.00	11.00	11.00	0.00%	0
Jan 27, 2026	11.00	11.00	11.00	11.00	0.00%	0
Jan 26, 2026	11.50	11.50	10.97	11.00	0.00%	2.00K
Jan 23, 2026	10.91	11.00	10.75	11.00	+4.76%	25.10K
Jan 22, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 21, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 20, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 16, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 15, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 14, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 13, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 12, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 9, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 8, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 7, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 6, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 5, 2026	10.50	10.50	10.50	10.50	0.00%	0
Jan 2, 2026	10.50	10.50	10.50	10.50	0.00%	0
Dec 31, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 30, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 29, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 26, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 24, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 23, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 22, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 19, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 18, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 17, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 16, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 15, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 12, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 11, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 10, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 9, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 8, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 5, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 4, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 3, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 2, 2025	10.50	10.50	10.50	10.50	0.00%	0
Dec 1, 2025	10.50	10.50	10.50	10.50	0.00%	0
Nov 28, 2025	10.50	10.50	10.50	10.50	0.00%	0
Nov 26, 2025	10.50	10.50	10.50	10.50	0.00%	0
Nov 25, 2025	10.53	10.53	10.50	10.50	-2.33%	38.60K
Nov 24, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 21, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 20, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 19, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 18, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 17, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 14, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 13, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 12, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 11, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 10, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 7, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 6, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 5, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 4, 2025	10.75	10.75	10.75	10.75	0.00%	0
Nov 3, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 31, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 30, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 29, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 28, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 27, 2025	10.75	10.75	10.75	10.75	0.00%	0
Oct 24, 2025	10.75	10.75	10.75	10.75	+1.49%	500
Oct 23, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 22, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 21, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 20, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 17, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 16, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 15, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 14, 2025	10.59	10.59	10.59	10.59	0.00%	0
Oct 13, 2025	10.59	10.59	10.59	10.59	-0.82%	1.00K
Oct 10, 2025	10.68	10.68	10.68	10.68	—	0

Prices are adjusted for stock splits. See adjusted closing price for how dividends and splits affect history, and the ATIIU chart for longer ranges.