Company: PENG
Filing Date: 2025-06-30
Form Type: S-8 POS
Source: 0001193125-25-152841
Chunk: 1

Company: Penguin Solutions, Inc.
Filing Date: 2025-06-30
Form: S-8 POS
Chunk 1
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-8REGISTRATION STATEMENT NO. 333-278588 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8REGISTRATION STATEMENT NO. 333-286345 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8REGISTRATION STATEMENT NO. 333-286347 UNDER THE SECURITIES ACT OF 1933 PENGUIN SOLUTIONS, INC. (Exact Name of Registrant as Specified in Its Charter)

| Delaware                        |     | 36-5142687            |
| (State or Other Jurisdiction of 
 Incorporation or Organization)  |     | -I.R.S. Employer      
 Identification Number |

1390 McCarthy Boulevard Milpitas, CA 95035 (Address of Principal Executive Offices) (Zip Code) Penguin Solutions, Inc. Amended and Restated 2017 Stock Incentive Plan Penguin Solutions, Inc. Amended and Restated 2018 Employee Stock Purchase Plan Penguin Solutions, Inc. Amended and Restated 2021 Inducement Plan (Full Title of the Plans) Anne Kuykendall Senior Vice President, Chief Legal Officer, and Secretary Penguin Solutions, Inc. 1390 McCarthy Boulevard Milpitas, CA 95035 (510) 623-1231 (Name and Address of Agent for Service) (Telephone Number, including Area Code, of Agent for Service) With copies to:

| Mark M. Bekheit                                  
 Erica Kassman                                    
 Latham & Watkins LLP                             
 140 Scott Drive Menlo                            
 Park, California 94025 Telephone: (650) 328-4600 
 Facsimile: (650) 463-2600                        |     | Anne Kuykendall                             
 Senior Vice President, Chief Legal Officer, 
 and Secretary Penguin                       
 Solutions, Inc. 1390 McCarthy Boulevard     
 Milpitas, CA 95035 (510) 623-1231           |

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer