Company: SONM
Filing Date: 2025-07-11
Form Type: DEFA14A
Source: 0001641172-25-018746
Chunk: 0

Company: SONIM TECHNOLOGIES INC
Filing Date: 2025-07-11
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934</div>

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

| ☐ | Preliminary                                                       
 Proxy Statement                                                   |
| ☐ | Confidential,                                                     
 for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ | Definitive                                                        
 Proxy Statement                                                   |
| ☒ | Definitive                                                        
 Additional Materials                                              |
| ☐ | Soliciting                                                        
 Material under §240.14a-12                                        |

<div align='center'>Sonim Technologies, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ | No           
 fee required |

| ☐ | Fee                                        
 paid previously with preliminary materials |

| ☐ | Fee                                                                                             
 computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

<div align='center'>ISS Recommends Sonim Technologies Stockholders to Vote “FOR” Company Nominees on the WHITE Proxy Card

ISS Underscores Orbic’s Months of Unreasonable Demands and Incomplete Offers</div>

July 11, 2025 7:30 AM EDT | Source: Sonim Technologies, Inc.

San Diego, California—(Newsfile Corp. - July 11, 2025) - Sonim Technologies, Inc. (NASDAQ: SONM), a leading provider of rugged mobile solutions, today announced that Institutional Shareholder Services (ISS) has recommended that Sonim stockholders vote “FOR” four of the Company’s nominees on the WHITE proxy card ahead of the Company’s upcoming Annual Meeting of Stockholders on July 18, 2025. ISS is the global leader in independent shareholder meeting research and issues voting recommendations on more than 50,000 shareholder meetings annually.

In its July 10, 2025, report 1, ISS determined that Orbic North America, LLC (“Orbic”) has failed to make a compelling case for change and that the Sonim Board’s response to