[Form 4] Ribbon Communications Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ribbon Communications (RBBN) reported an insider equity transaction by its EVP and Chief Financial Officer, John Townsend. On October 15, 2025, he acquired 128,205 shares of Common Stock via conversion of previously granted RSUs. In connection with the vesting, 50,448 shares were withheld by the issuer to satisfy tax obligations at $3.81 per share.

Following these transactions, Townsend held 77,757 shares directly. He also retained 102,564 RSUs outstanding. The RSUs were granted on October 15, 2024, with one-third vesting on October 15, 2025; the remaining two-thirds vest in four equal semi-annual installments through October 15, 2027.

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

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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^*

Townsend John Raymond

(Last) (First) (Middle)

6500 CHASE OAKS BLVD.

SUITE 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)
	EVP, Chief Financial Officer

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		128,205	A	(1)	128,205	D
Common Stock	10/15/2025		F		50,448	D	$3.81(2)	77,757	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			128,205	(3)	(3)	Common Stock	128,205	$0	102,564	D

Explanation of Responses:

1. These RSUs convert to Common Stock on a one-for-one basis.

2. Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting.

3. The RSUs were granted on October 15, 2024 and vested as to one-third on October 15, 2025; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through October 15, 2027.

	Patrick Macken, By POA from John Townsend	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).
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FAQ

What insider transaction did Ribbon Communications (RBBN) disclose?

The CFO, John Townsend, acquired 128,205 Common Stock shares via RSU conversion on October 15, 2025.

How many shares were withheld for taxes in the RBBN Form 4?

50,448 shares were withheld by the issuer to satisfy tax obligations at $3.81 per share.

How many Ribbon (RBBN) shares does the CFO hold after the transaction?

Following the reported transactions, he held 77,757 shares directly.

How many RSUs remain outstanding for the RBBN CFO?

He retained 102,564 RSUs outstanding after the conversion and withholding.

What is the vesting schedule for the CFO’s RSUs at Ribbon (RBBN)?

Granted on October 15, 2024; one-third vested on October 15, 2025, with the remaining two-thirds vesting in four equal semi-annual installments through October 15, 2027.

What is John Townsend’s role at Ribbon Communications (RBBN)?

He is the company’s EVP, Chief Financial Officer.