Sam Bucci - Oct 17, 2025 Form 4 Insider Report for Ribbon Communications Inc. (RBBN)

Role
EVP & COO
Signature
Patrick Macken, By POA for Sam Bucci
Stock symbol
RBBN
Transactions as of
Oct 17, 2025
Transactions value $
-$52,650
Form type
4
Date filed
10/17/2025, 05:41 PM
Previous filing
May 19, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Bucci Sam EVP & COO 6500 CHASE OAKS BLVD., STE, 100, PLANO Patrick Macken, By POA for Sam Bucci 2025-10-17 0001824854

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction RBBN Common Stock Options Exercise +25.8K +5.91% 463K Oct 17, 2025 Direct F1
transaction RBBN Common Stock Tax liability -$52.7K -13.8K -2.99% $3.81 449K Oct 17, 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 -25.8K -50% $0.00 25.8K Oct 17, 2025 Common Stock 25.8K 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 granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.