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Livermore
Livermore
ZHEN

Archimedes Tech SPAC Partners II Co.

ATIIU
Exchange
Nasdaq
Industry
Blank Checks
SEC CIK
0002028516

No open-market purchases or sales by Archimedes Tech SPAC Partners II Co. insiders were filed in the last 90 days; 4 institutions reported holding it in 13F filings for Q2 2026, worth $1.32M in total; no superinvestor holds it.

Other share classesATIIATIIW

Holders of 5% or more of ATIIU

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Archimedes Tech SPAC Partners II Co., largest stake first. The change is against the holder's previous filing.

No holder currently reports owning 5% or more of Archimedes Tech SPAC Partners II Co. on Schedule 13D or 13G.

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

5 Schedule 13D and 13G filings on Archimedes Tech SPAC Partners II Co., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on ATIIU
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 14, 20261:42 PM ETTenor Capital Management Co., L.P.and 2 others13G/A4.60%1.37M shares−0.50 ppfrom 5.10%Below 5%Jun 30, 2026SEC
Nov 7, 202511:09 AM ETTenor Capital Management Co., L.P.and 2 others13G/A5.10%1.50M shares−0.70 ppfrom 5.80%Sep 30, 2025SEC
Aug 14, 20254:01 PM ETSculptor Capital LPand 6 others13G/A4.39%1.30M shares−0.66 ppfrom 5.05%Below 5%Jun 30, 2025SEC
Feb 19, 20255:03 PM ETTenor Capital Management Co., L.P.and 2 others13G5.80%1.50M sharesNewFeb 11, 2025SEC
Feb 19, 20256:15 AM ETSculptor Capital LPand 6 others13G5.05%1.30M sharesNewFeb 11, 2025SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Archimedes Tech SPAC Partners II Co. shares.

No Form 144 notices for Archimedes Tech SPAC Partners II Co. are on file.