Company: ATIIU
Filing Date: 2025-02-05
Form Type: S-1/A
Source: 0001437749-25-002910
Chunk: 0

Company: Archimedes Tech SPAC Partners II Co.
Filing Date: 2025-02-05
Form: S-1/A
Chunk 0
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<div align='center'>As filed with the U.S. Securities and Exchange Commission
under the Securities Act of 1933, as amended, on February 5, 2025.</div>

Registration No. 333-282885

<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Amendment No. 4

to

FORM S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

Archimedes Tech SPAC Partners II Co.
(Exact name of registrant as specified in its charter)</div>

| Cayman Islands                  |     |                         6770 |     | N/A                   |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

<div align='center'>Long Long
Chief Executive Officer
Archimedes Tech SPAC Partners II Co.

2093 Philadelphia Pike #1968

Claymont, DE 19703

(725) 312-2430
(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Copies to:</div>

| Mitchell S. Nussbaum 
 Giovanni Caruso      
 Loeb & Loeb LLP      
 345 Park Avenue      
 New York, NY 10154   
 Tel: (212) 407-4000  | Joel L. Rubinstein          
 Daniel E. Nussen            
 White & Case LLP            
 1221 Avenue of the Americas 
 New York, NY 10020          
 Tel: (212) 819-8200         |

Approximate date of commencement of proposed sale to the public:As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box: ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the