Company: PENG
Filing Date: 2025-03-24
Form Type: DEFA14A
Source: 0001193125-25-060911
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Company: Penguin Solutions, Inc.
Filing Date: 2025-03-24
Form: DEFA14A
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 24, 2025 PENGUIN SOLUTIONS, INC. (Exact name of registrant as specified in its charter) Commission File Number 001-38102

| Cayman Islands                           |     | 98-1013909         |
| (State or Other Jurisdiction of          
 Incorporation or Organization)           |     | -I.R.S. Employer   
 Identification No. |
| c/o Walkers Corporate Limited            
 190 Elgin Avenue George                  
 Town, Grand Cayman Cayman Islands        |     | KY1-9008           |
| (Address of Principal Executive Offices) |     | -Zip Code          |

Registrant’s Telephone Number, Including Area Code: (510) 623-1231 Not Applicable (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☒ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 
 CFR 240.14a-12)                                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                        |     | Trading   
 Symbol(s) |     | Name of each exchange       
 on which registered         |
| Ordinary shares, $0.03 par value per share |     | PENG      |     | Nasdaq Global Select Market |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2of the Securities Exchange Act of 1934 (§ 240