Latest Period
Q2 2026
Security Snapshot
Archimedes Tech SPAC Partners III Co. - UNIT 01/23/2031 (ARCIU) Institutional Ownership
CUSIP: G0453R121
13F Institutional Holders and Ownership History from Q1 2026 to Q2 2026
Institutions Reporting
15
Shares (Excl. Options)
4,625,063
Price
$10.19
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- Security type / class
- Equity / UNIT 01/23/2031
- Symbol
- ARCIU on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 4,625,063
- Total 13F value
- $47,263,995
- Portfolio coverage rank
- 0%
- Share change
- -3,981,758
- Value change
- -$39,770,098
- Number of holders
- 15
- SEC-reported price per share
- $10.19
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
1 identity field
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ARCIU - Archimedes Tech SPAC Partners III Co. - UNIT 01/23/2031 is tracked under CUSIP G0453R121.
- 15 institutions reported positions in Q2 2026.
- Schedule 13D/13G significant owner rows are not currently available.
Change
- Holder count moved from 29 to 15 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $91,017,962 to $47,263,995.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 15 institutions filings for Q2 2026.
Security key
G0453R121
Latest holder period
Q2 2026
13F holders
15
13D/G owners
0
CIK / CUSIP context first
Open Q2 2026 holders
ARCIU full holder history
Archimedes Tech SPAC Partners III Co. SEC filings
Archimedes Tech SPAC Partners III Co. company facts
Archimedes Tech SPAC Partners III Co. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G0453R121:
As of 30 Jun 2026, 15 institutional investors reported holding 4,625,063 shares of Archimedes Tech SPAC Partners III Co. - UNIT 01/23/2031 (ARCIU).
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
2
Latest
Q2 2026
Rows shown
1-2 of 2