Archimedes Tech SPAC Partners III Co. ARCI · SEC Filings

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Archimedes Tech SPAC Partners III Co. is a special purpose acquisition company (SPAC), specifically ...

Price10.09

Market Cap355.79 M

Float28.87 M

CountryUS

SectorFinancial Services

ExchangeNASDAQ

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Financials

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10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 13, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

May 14, 2026

News

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8-K

Archimedes Tech SPAC Partners III Co. Appoints Stephen N. Cannon as Independent Director

Jul 17, 2026

8-K

Archimedes Tech SPAC Partners III Co. Announces CEO Transition

May 1, 2026

8-K

Archimedes Tech SPAC Partners III Co. Announces Separate Trading of Ordinary Shares and Warrants

Mar 10, 2026

8-K

Archimedes Tech SPAC Partners III Co. Announces Financial Statement and Initial Public Offering Details

Jan 30, 2026

8-K

Archimedes Tech SPAC Partners III Co. Announces Upsized $240 Million IPO

Jan 26, 2026

Prospectus

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424B4

IPO | Offering amount: $240,000,000 | Shares: 24,000,000 | Price: $10.000 | Bank: BTIG, LLC

Jan 23, 2026

424B4

IPO | Offering amount: $240,000,000 | Shares: 24,000,000 | Price: $10.000 | Bank: BTIG, LLC

Jan 23, 2026

Registrations

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S-1MEF

OFFERING

Jan 22, 2026

8-A12B

Form 8-A12B - Registration of securities [Section 12(b)]

Jan 22, 2026

S-1/A

OFFERING - FIRM COMMITMENT | Bank: BTIG

Jan 20, 2026

S-1/A

OFFERING | Bank: BTIG

Jan 14, 2026

S-1

OFFERING - FIRM COMMITMENT | Bank: BTIG

Dec 23, 2025

DRS

Form DRS - Draft Registration Statement

Oct 7, 2025

Proxies

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Ownerships

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Cannon Stephen N (Reporting)

Jul 17, 2026

SCHEDULE 13G

Adage Capital Management, L.P. (Filed by)

May 13, 2026

Archimedes Tech SPAC Sponsors III LLC (Reporting)

Jan 26, 2026

Long Long (Reporting)

Jan 26, 2026

Landen Ben (Reporting)

Jan 23, 2026

Archimedes Tech SPAC Sponsors III LLC (Reporting)

Jan 23, 2026

Other

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EFFECT

Form EFFECT - Notice of Effectiveness

Jan 23, 2026