Form 8-K

8-K — Ribbon Communications Inc.

Accession: 0001104659-26-070981

Filed: 2026-06-05

Period: 2026-06-03

CIK: 0001708055

SIC: 7373 (SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN)

Item: Submission of Matters to a Vote of Security Holders

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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): June 3, 2026

RIBBON COMMUNICATIONS INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware

001-38267

82-1669692

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

6500 Chase Oaks Blvd., Suite 100, Plano, TX

75023

(Address of Principal Executive Offices) (Zip Code)

(978) 614-8100

(Registrant’s telephone number, including

area code)

N/A

(Former Name or Former Address, if Changed Since

Last Report)

Check the appropriate box below if the Form 8-K

filing 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

Common Stock, par value $0.0001

RBBN

The 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-2 of the Securities

Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging

growth company ¨

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for

complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.07. Submission of Matters to a Vote of Security Holders.

Ribbon Communications Inc. (the “Company”)

held its annual meeting of stockholders on June 3, 2026 (the “Annual Meeting”). At the Annual Meeting, the Company’s

stockholders considered and voted upon the matters listed below. A total of 163,724,665 shares of common stock were present in person

or represented by proxy at the Annual Meeting, representing approximately 93% of the Company’s outstanding common stock as of the

April 6, 2026 record date. The following are the voting results for the proposals considered and voted upon at the Annual Meeting, each

of which were described in the Proxy Statement.

Item

1 – Election of nine directors for a term of office expiring on the date of the annual meeting of stockholders in 2027

and until their respective successors have been duly elected and qualified.

Director

Votes For

Votes Against

Abstentions

Broker Non-Votes

R. Stewart Ewing, Jr.

146,551,668

580,988

526,752

16,363,552

Bruns H. Grayson

146,208,271

925,393

525,744

16,363,552

Beatriz V. Infante

140,967,587

6,167,837

523,984

16,363,552

Scott Mair

146,568,172

565,390

525,846

16,363,552

Bruce W. McClelland

146,407,178

724,725

527,505

16,363,552

Shaul Shani

146,237,876

896,484

525,048

16,363,552

Louis Silver

146,380,850

747,357

531,201

16,363,552

Richard W. Smith

146,215,664

912,891

530,853

16,363,552

Tanya Tamone

146,198,151

928,158

533,099

16,363,552

All of the nominees named

above were elected, having received more votes cast “for” their election than “against” their election.

Item

2 – Ratification of the appointment of Deloitte & Touche LLP to serve as the Company’s independent registered

public accounting firm for the fiscal year ending December 31, 2026.

Votes For

162,346,373

Votes Against

367,109

Abstentions

1,309,478

Based on the foregoing vote, Item 2 was approved.

Item

3 – The non-binding advisory vote on the compensation of the Company’s named executive officers, as disclosed in

the “Compensation Discussion and Analysis” section and the accompanying compensation tables and related narratives contained

in the proxy statement for the Annual Meeting.

Votes For

98,595,579

Votes Against

43,428,949

Abstentions

5,634,880

Broker Non-Votes

16,363,552

Based on the foregoing vote, Item 3 was approved.

The Compensation Committee and the Board of

Directors of the Company will consider the outcome of the advisory vote when making future compensation decisions relating to the

compensation paid to the Company’s named executive officers.

SIGNATURE

Pursuant to the requirements

of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto

duly authorized.

Date: June 5, 2026 Ribbon Communications Inc.

By:

/s/ Patrick Macken

Name:

Patrick W. Macken

Title:

Executive Vice President, Chief Legal Officer and Secretary

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