Eric S. Marmurek - Oct 15, 2025 Form 4 Insider Report for Ribbon Communications Inc. (RBBN)

Role
SVP, Deputy CFO and CAO
Signature
Patrick Macken, By POA from Rick Marmurek
Stock symbol
RBBN
Transactions as of
Oct 15, 2025
Transactions value $
-$112,441
Form type
4
Date filed
10/17/2025, 05:22 PM
Previous filing
May 19, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Marmurek Eric S SVP, Deputy CFO and CAO 6500 CHASE OAKS BLVD., STE. 100, PLANO Patrick Macken, By POA from Rick Marmurek 2025-10-17 0001720721

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction RBBN Common Stock Options Exercise +75K +19.66% 457K Oct 15, 2025 Direct F1
transaction RBBN Common Stock Tax liability -$112K -29.5K -6.46% $3.81 427K Oct 15, 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction RBBN Restricted Stock Units (RSUs) Options Exercise $0 -75K -50% $0.00 75K Oct 15, 2025 Common Stock 75K Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Eash RSU represents a contingent right to receive one share of the Registrant's common stock.
F2 Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.
F3 The RSUs were issued on October 15, 2024 and vested as to 50% on October 15, 2025. The remaining 50% of the RSUs vest in two equal semi-annual installments thereafter through October 15, 2026.