Form 4 for ARCI Archimedes Tech SPAC Partners III Co.

Accepted 2026-01-26 00:00:00 ET · period of report 2026-01-26 · accession 0001437749-26-002115 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
DI	2026-01-26	2026-01-26	ARCI	Long Long	CEO, Dir, 10%	P - Purchase	—	+390.0K	390.0K	New	—
DI	2026-01-26	2026-01-26	ARCI	Long Long	CEO, Dir, 10%	P - Purchase	—	+97.5K	97.5K	New	—

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Ordinary Shares	2026-01-26	P	A	390,000	—	390,000	I See Footnote	—	—	(F1) 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.
2	Derivative	Warrants to purchase Ordinary Shares	2026-01-26	P	A	97,500	—	97,500	I See Footnote	$11.50 · — to —	97,500 Ordinary Shares	(F1) 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. (F2) 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.