[Form 4] Ribbon Communications Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ribbon Communications (RBBN) disclosed an insider equity event. On 10/15/2025, the SVP, Deputy CFO and CAO reported the settlement of 75,000 Restricted Stock Units (code M), delivering an equal number of common shares. To cover taxes upon vesting, 29,512 shares were withheld at $3.81 per share (code F).

Following these transactions, the officer directly beneficially owns 427,063 common shares. The RSUs were granted on 10/15/2024, vested 50% on 10/15/2025, with the remaining 50% vesting in two equal semi-annual installments through 10/15/2026.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Marmurek Eric S

(Last) (First) (Middle)

6500 CHASE OAKS BLVD.

STE. 100

(Street)

PLANO TX 75023

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Ribbon Communications Inc. [ RBBN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Deputy CFO and CAO

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/15/2025		M		75,000	A	(1)	456,575	D
Common Stock	10/15/2025		F		29,512	D	$3.81(2)	427,063	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units (RSUs)	(1)	10/15/2025		M			75,000	(3)	(3)	Common Stock	75,000	$0	75,000	D

Explanation of Responses:

1. Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

2. Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.

3. 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.

	Patrick Macken, By POA from Rick Marmurek	10/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did RBBN's insider report on Form 4?

An officer settled 75,000 RSUs into common stock and had 29,512 shares withheld to satisfy taxes.

Who is the reporting person in RBBN's filing?

The SVP, Deputy CFO and CAO of Ribbon Communications.

When did the RBBN transactions occur?

On 10/15/2025.

How many RBBN shares does the insider own after the transactions?

Direct beneficial ownership is 427,063 common shares after the reported transactions.

What was the tax withholding price for RBBN shares?

Shares were withheld at $3.81 per share to cover tax obligations.

What are the vesting terms of the reported RSUs at RBBN?

Granted on 10/15/2024, vested 50% on 10/15/2025, with the remaining vesting in two equal semi-annual installments through 10/15/2026.

What do transaction codes M and F mean in RBBN's filing?

Code M indicates RSU settlement into shares; code F indicates shares withheld to pay taxes.