ATIIU
Archimedes Tech SPAC Partners II Co.Units of Archimedes Tech SPAC Partners II Co. · ATII stock page →
—
1 year
−23.7%
from $10.75 · Oct 28
30 days
−27.4%
from $11.30
52-week range
$8.20–16.15
at the low
Avg volume 20D
3.8K
Oct 13 spike 40.8K
Short interest
4.5K
+398.9%
Days to cover
1.0
at average volume
New fund stakes
0
Q2 2026 13F · 0 exits
Price
Daily candles with volume. Pins mark insider trades, rating changes, 13F stakes, reports, catalysts and short-interest jumps.
No data for this timeframe.
- X Aug 31 Short interest falls 61.4% to 142
- X Sep 15 Short interest jumps 340.9% to 626
- X Sep 30 Short interest jumps 45.0% to 908
- X Oct 15 Short interest jumps 398.9% to 4.5K
- E Oct 16 Trading halt: Halt Resumed: ATIIU — trading resumed after LUDP (Volatili…
- E Oct 16 Trading halt: Trading Halt: ATIIU — LUDP (Volatility Trading Pause)
- E Oct 21 Trading halt: Halt Resumed: ATIIU — trading resumed after LUDP (Volatili…
- E Oct 21 Trading halt: Trading Halt: ATIIU — LUDP (Volatility Trading Pause)
Signal stack
Where each data set points today.
- InstitutionsMIXED
Q2 2026: 1 added (0 new), 0 trimmed or exited.
- Short sellersBUILDING
Short interest +398.9% to 4.5K shares. 1.0 days to cover.
- TrendDOWNTREND
26% below its 50-day average. New closing low $8.20 on Oct 21.
Who's buying
13F· Q2 20260
new positions
0
exits
| Fund | Move | Value |
|---|---|---|
| Clear Street Group Inc. | ADD | $169.8K |
Quarterly 13F filings are due 45 days after each quarter ends.
Catalysts
Scheduled dates and disclosed events: earnings, FDA and trial readouts, halts, press releases. Colored dot = impact.
Recent
Oct 22, 2026
Listing
Delisted: ATIIU — removed from the Nasdaq symbol directory
Archimedes Tech SPAC Partners II Co. - Unit
Oct 21, 2026
Trading halt
Halt Resumed: ATIIU — trading resumed after LUDP (Volatility Trading Pause)
Halted 2026-10-21T18:09:55.000Z | Resumed 2026-10-21T18:19:55.000Z
Oct 21, 2026
Trading halt
Trading Halt: ATIIU — LUDP (Volatility Trading Pause)
Archimedes Tech SPAC Partner U | Market: NASDAQ | Code: LUDP — Volatility Trading Pause
Oct 16, 2026
Announcement
Archimedes Tech SPAC Partners II Co. Announces Shareholder Approval of Proposed Business Combination with Forge Nano, Inc.
CLAYMONT, Del., Oct. 16, 2026 (GLOBE NEWSWIRE) -- Archimedes Tech SPAC Partners II Co. (Nasdaq: ATII) (“Archimedes II” or “ATII”), a publicly…
Oct 16, 2026
Trading halt
Halt Resumed: ATIIU — trading resumed after LUDP (Volatility Trading Pause)
Halted 2026-10-16T17:03:58.000Z | Resumed 2026-10-16T17:13:58.000Z
Earnings setup
Estimates| Period | EPS est. | Range | 30D rev. | Revenue |
|---|---|---|---|---|
| Current Q | — | — | — | $0.00 |
| Next Q | — | — | — | $0.00 |
| Current FY | — | — | — | $0.00 |
| Next FY | — | — | — | $0.00 |
Recent activity
The latest filings, insider trades, analyst actions, press and options flow — newest first.
Oct 22, 2026 Listing status
Delisted: ATIIU — removed from the Nasdaq symbol directory
Archimedes Tech SPAC Partners II Co. - Unit
Jun 30, 2026 Inst.
Clear Street Group Inc. — ADD
14,164 shares ($169.8K)
Short side
FINRA· Oct 15, 20264,530
shares short
+398.9%
vs prior settlement
1.0
days to cover
Trading halts
| Oct 21, 2026 | Volatility Pause | Resumed |
| Oct 16, 2026 | Volatility Pause | Resumed |
| Oct 14, 2026 | Volatility Pause | Resumed |
| Oct 14, 2026 | Volatility Pause | Resumed |
| Oct 13, 2026 | Volatility Pause | Resumed |