Archimedes Tech SPAC Partners II Co. Unit (ATIIU) Stock: Price, Insider Activity & Smart Money | Midas Edge

ATIIU

Archimedes Tech SPAC Partners II Co. Unit

NASDAQ

$8.20-8.99%

Close Oct 21, 2026

Price history and reported events

1Y price return -23.7%

Prices adjusted for splits; dividends excluded.

About the chart and event marks

Oct 24, 2025–Oct 21, 2026. Returns are rebased to the first displayed observation. Prices use the latest stored close's share basis, linked backward through stored price returns. Marks use their recorded calendar dates, including non-trading days; their lanes do not imply a price or that an event caused a move.

Insiders: green purchases, red sales. Other lanes: 13F reporting period ends, stored earnings-calendar dates and flagged filings. Select a mark or open the dated list for its evidence.

Dated events · 0

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What Midas sees

Reported evidence, not a forecast

Smart Money · Holder IQ

67.8 / 100

Above median holder quality (percentile 88.5 this quarter).

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Insiders · reported activity

None recorded

No stored transaction records were returned for this filing window. Last 180 days of filings: 0 purchases, 0 sales.

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Active filing flags

0 flags

No active flags are recorded; this is not an all-clear.

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Reading stored signals…

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Insider Activity

Track CEO, CFO, and director trades

Why it matters

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Smart Money

Holder IQ: medium

Q2 2026, filed Aug 14, 2026

Why it matters

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Red Flags

No red flags detected

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1 month: —
3 months: —
1 year: —
52-week range: $8.20
$16.15

More market facts

Dividend: No dividends on record
Short interest: 4.5K sharessettled Oct 15, 2026 · +398.9% since Sep 30, 2026 · FINRA

End-of-day close from stored market data, not a live quote.

Short-interest history

Reported short positions, stored float percentages and adjusted prices over the same period.

Shares short

Adjusted close · USD

Dates mark FINRA settlements.

Settlement records · 28 observations

Settlement Oct 15, 2026
4,530 shares short
+3,622 shares (+398.9%) vs Sep 30, 2026
Published Oct 26, 2026.
Settlement Sep 30, 2026
908 shares short
+282 shares (+45%) vs Sep 15, 2026
Published Oct 9, 2026.
Settlement Sep 15, 2026
626 shares short
+484 shares (+340.8%) vs Aug 31, 2026
Published Sep 24, 2026.
Settlement Aug 31, 2026
142 shares short
-226 shares (-61.4%) vs Aug 14, 2026
Published Sep 10, 2026.
Settlement Aug 14, 2026
368 shares short
0 shares (0%) vs Jul 31, 2026
Published Aug 25, 2026.
Settlement Jul 31, 2026
368 shares short
-4 shares (-1.1%) vs Jul 15, 2026
Published Aug 11, 2026.
Settlement Jul 15, 2026
372 shares short
0 shares (0%) vs Jun 30, 2026
Published Jul 24, 2026.
Settlement Jun 30, 2026
372 shares short
-111 shares (-23%) vs Jun 15, 2026
Published Jul 10, 2026.
Settlement Jun 15, 2026
483 shares short
+59 shares (+13.9%) vs May 29, 2026
Published Jun 25, 2026.
Settlement May 29, 2026
424 shares short
+359 shares (+552.3%) vs May 15, 2026
Published Jun 9, 2026.
Settlement May 15, 2026
65 shares short
-198 shares (-75.3%) vs Oct 15, 2025
Published May 27, 2026.
Settlement Oct 15, 2025
263 shares short
-245 shares (-48.2%) vs Sep 30, 2025
Published Oct 24, 2025.
Settlement Sep 30, 2025
508 shares short
-706 shares (-58.2%) vs Sep 15, 2025
Published Oct 9, 2025.
Settlement Sep 15, 2025
1,214 shares short
-5 shares (-0.4%) vs Aug 29, 2025
Published Sep 24, 2025.
Settlement Aug 29, 2025
1,219 shares short
-511 shares (-29.5%) vs Aug 15, 2025
Published Sep 10, 2025.
Settlement Aug 15, 2025
1,730 shares short
+110 shares (+6.8%) vs Jul 31, 2025
Published Aug 26, 2025.
Settlement Jul 31, 2025
1,620 shares short
+273 shares (+20.3%) vs Jul 15, 2025
Published Aug 11, 2025.
Settlement Jul 15, 2025
1,347 shares short
-572 shares (-29.8%) vs Jun 30, 2025
Published Jul 24, 2025.
Settlement Jun 30, 2025
1,919 shares short
-319 shares (-14.3%) vs Jun 13, 2025
Published Jul 10, 2025.
Settlement Jun 13, 2025
2,238 shares short
+1,965 shares (+719.8%) vs May 30, 2025
Published Jun 25, 2025.
Settlement May 30, 2025
273 shares short
-384 shares (-58.4%) vs May 15, 2025
Published Jun 10, 2025.
Settlement May 15, 2025
657 shares short
-8,182 shares (-92.6%) vs Apr 30, 2025
Published May 27, 2025.
Settlement Apr 30, 2025
8,839 shares short
+5,559 shares (+169.5%) vs Apr 15, 2025
Published May 9, 2025.
Settlement Apr 15, 2025
3,280 shares short
+977 shares (+42.4%) vs Mar 31, 2025
Published Apr 25, 2025.
Settlement Mar 31, 2025
2,303 shares short
+842 shares (+57.6%) vs Mar 14, 2025
Published Apr 9, 2025.
Settlement Mar 14, 2025
1,461 shares short
-87 shares (-5.6%) vs Feb 28, 2025
Published Mar 25, 2025.
Settlement Feb 28, 2025
1,548 shares short
-815 shares (-34.5%) vs Feb 14, 2025
Published Mar 11, 2025.
Settlement Feb 14, 2025
2,363 shares short
Published Feb 26, 2025.

Change = this settlement’s shares short − the previous recorded settlement’s shares short; percentage change divides by that earlier count. A zero earlier count has no percentage change. Split-spanning counts are left uncompared. Float percentages use the stored settlement observation, not today’s float.

Source: stored FINRA equity short-interest records. Adjusted prices exclude a reused ticker’s earlier issuer. FINRA data and reporting dates · How to read short interest

Portfolio context

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Market context

Smart money context

Holder IQ: MEDIUM

2 smart-money holders: institutions with a high Holder IQ

Q2 2026, filed Aug 14, 2026

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Red flags

Red flags: 0

Largest 13-F holders · Q2 2026

4 filers reported a long position in ATIIU for Q2 2026. 13-F holdings are filed up to 45 days after the quarter ends.

The top 4 hold

100%

of the 110.4K shares 13-F filers reported

Moves vs Q1 2026

1 added3 trimmed

Net shares held

+1.8%

across the 4 holders with a comparable Q1 2026 book

Rank	Holder	Value	Shares	Shares vs Q1 2026
1	JPMorgan Chase & Co	$587.5K · 49K shares	49K	-2%
2	Jane Street Group, LLC	$533.4K · 45K shares	45K	-2.2%
3	Clear Street Group Inc.	$169.8K · 14.2K shares	14.2K	+41.6%
4	UBS Group AG	$25.2K · 2.2K shares	2.2K	-7.5%

Sign in to see each holder’s Holder IQ, factor-adjusted Holder IQ and rank, and compare these holders with all scored filers. Available on every plan.

Moves the factor model did not explain

How much of ATIIU’s move accompanied the market and its measured style leanings, and how much was left? The residual is unexplained by this fitted model. It does not establish a cause, skill or future alpha.

Return split unavailable. A unique ordinary-share USD model listing is unavailable.

Link an account with dated transactions to see what share of your own holding’s move since its purchase-date close was unexplained, with long and short positions distinguished. Your private holdings never enter this public chart.

Dated model observations (0)

Daily percentage returns, not window contributions. Source: the same dated warehouse rows and model v1.2.0; observed 2026-11-13T17:07:53.993Z. Absent sessions are never interpolated; missing or failed inputs stay unavailable.

ATIIU dated stock, market, style and residual returns
Date	Stock	Market	Styles	Residual

How this split is calculated

Each day uses that day’s fitted market intercept and style exposures multiplied by that day’s published factor returns. Their sum plus the independently stored residual must reconcile to the stock return. Window effects are weighted by stock wealth at each day’s start and added; the stock return compounds. Every expected US market session must be present and pass source, identity, model and numerical checks. This retrospective fit is an explanation of measured returns, not evidence of causation or an investable forecast. The window ends at the latest published model session, which can lag the market; today’s unfinished session is excluded.

What insiders reported owning

Read the balances behind the trades: SEC Forms 3, 4 and 5 state a reporting owner’s position, not just an amount bought or sold. These are dated filing observations, not current holdings or a trading signal.

Ownership history unavailable. No identity-bound filing ownership observations are available.

Link an account to see your stake, watchlist and past holdings. A reported balance adds context to a sale or purchase: an insider may still report a substantial position. This view does not calculate a percentage sold or a combined insider total. Different classes, indirect vehicles, derivatives and joint filers may overlap; changes can also reflect awards, gifts, exercises, splits or corrections. Neither a balance nor a change predicts your return.

Available filings through Nov 13, 2026; read Nov 13, 2026, 5:07 PM UTC. Latest 240 stored rows, up to 24 distinct reporting-owner positions. The stored sample need not be a complete ownership history. No holdings or account data about the reader enters this public evidence.

What insiders reported owning

Reading dated filing evidence…

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