[DEFA14A] Sonim Technologies, Inc. Additional Proxy Soliciting Materials

Rhea-AI Filing Summary

Sonim Technologies (NASDAQ:SONM) filed DEFA14A additional proxy materials on June 26 2025. The document reproduces CFO Clay Crolius’s email to employees explaining how to obtain and vote the WHITE proxy card for the 2025 Annual Meeting. Voting closes July 17 2025 at 11:59 p.m. ET; questions are directed to proxy solicitor Sodali or individual brokers. Stockholders are encouraged to review the definitive proxy statement filed June 18 2025, which identifies directors and officers—Peter Liu, Clay Crolius, James Cassano, Mike Mulica, Jack Steenstra and Jeffrey Wang—as participants in the solicitation under SEC rules.

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

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

Sonim Technologies, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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

On June 26, 2025, the following email was sent by Clay Crolius, Chief Financial Officer of Sonim Technologies, Inc. (the “Company”), to the Company’s employees:

Team,

Many of you have been asking when and how you will receive the WHITE card for proxy voting. If you haven’t already received communication from your broker (e.g. E-Trade) or if you have questions, please contact your broker directly or the Company’s proxy solicitor, Sodali:

430 Park Avenue, 14th Floor,

New York, NY 10022

Banks and Brokers Call: (203) 658-9400

Stockholders Call Toll Free: (800) 662-5200

E-mail: SONM@investor.sodali.com

Voting closes July 17, 2025 at 11:59PM Eastern Time.

Best regards,

Clay

Clay Crolius

CFO

Sonim Technologies

Important Information and Where to Find It

Sonim has filed with the SEC a definitive proxy statement on Schedule 14A, containing a form of WHITE proxy card, with respect to its solicitation of proxies for the 2025 Annual Meeting of Stockholders.

Sonim’s stockholders are strongly encouraged to read Sonim’s definitive proxy statement (including any amendments or supplements thereto) and any other documents to be filed with the SEC carefully and in their entirety when they become available because they will contain important information.

Stockholders may obtain a free copy of the definitive proxy statement, any amendments or supplements to the proxy statement, and other documents that Sonim files with the SEC at no charge from the SEC’s website at www.sec.gov. Copies will also be available at no charge on Sonim’s website at https://ir.sonimtech.com/sec-filings/all-sec-filings.

Participants in Solicitation

Sonim and its respective directors, executive officers, and other members of their management and employees, including Peter Liu (Chief Executive Officer and a director), Clay Crolius (Chief Financial Officer), and Sonim’s directors – James Cassano, Mike Mulica, Jack Steenstra, and Jeffrey Wang – under SEC rules, may be deemed to be participants in the solicitation of proxies of Sonim’s stockholders in connection with the election of directors at Sonim’s 2025 Annual Meeting and related proposals to Sonim’s stockholders.

Stockholders may obtain more detailed information regarding Sonim’s directors and executive officers, including a description of their direct or indirect interests, by security holdings or otherwise, under the captions “Directors, Executive Officers, and Corporate Governance ,” “Security Ownership of Certain Beneficial Owners and Management ,” and “Certain Relationships and Related Party Transactions” of Sonim’s definitive proxy statement for the 2025 Annual Meeting filed with the SEC on June 18, 2025.

To the extent holdings of our directors and executive officers reported in the definitive proxy statement change, such changes will be reflected on Statements of Change in Ownership on Forms 3, 4 or 5 filed with the SEC, if and when they become available. These documents will be available free of charge as described above.

FAQ

When does SONM's 2025 proxy voting period close?

Voting for Sonim's 2025 Annual Meeting closes on July 17, 2025 at 11:59 p.m. Eastern Time.

What proxy card should SONM shareholders use in 2025?

Shareholders should vote using the WHITE proxy card included with Sonim’s definitive proxy materials.

Where can investors download Sonim's 2025 definitive proxy statement?

It is available free of charge at www.sec.gov and on Sonim’s investor relations site under SEC filings.

Who is managing Sonim's proxy solicitation for 2025?

Proxy firm Sodali is the solicitor; contact (800) 662-5200 or SONM@investor.sodali.com for assistance.