X0508 4 2026-01-26 0002083910 Archimedes Tech SPAC Partners III Co. ARCI 0001793151 Long Long 2093 PHILADELPHIA PIKE #1968 CLAYMONT DE 19703 1 1 1 Chief Executive Officer 0 Ordinary Shares 2026-01-26 4 P 0 390000 A 390000 I See Footnote Warrants to purchase Ordinary Shares 11.50 2026-01-26 4 P 0 97500 A Ordinary Shares 97500 97500 I See Footnote Reflects the 390,000 private units owned by Archimedes Tech SPAC Sponsors III LLC, the Issuer's sponsor (the "Sponsor"). Each private unit consists of one ordinary share and one-fourth of one redeemable warrant, with each whole warrant entitling the holder thereof to purchase one ordinary share for $11.50 per share, subject to adjustment. The private units were purchased pursuant to a Private Units Purchase Agreement, dated January 22, 2026, by and between the Issuer and the Sponsor, at $10.00 per unit for an aggregate purchase price of $3,900,000. Long Long is the managing member of the Sponsor and has voting and dispositive power over the shares owned by the Sponsor. Mr. Long disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly. The warrants included in the private units will become exercisable at the later of 12 months from the closing of the Issuer's initial public offering and 30 days after the completion of the Issuer's initial business combination and will expire five years after the completion of the initial business combination or earlier upon redemption or liquidation. /s/ Long Long 2026-01-26