Ribbon Communications CFO receives 37,500 shares

Q: How many RBBN shares did CFO Eric S. Marmurek receive, and how many were withheld?

Marmurek received 37,500 common shares when 37,500 RSUs vested on October 15, 2026. Ribbon withheld 14,756 shares at $1.46 per share to satisfy tax withholding obligations.

Q: What was the vesting schedule for Eric S. Marmurek's RBBN RSUs?

The RSUs were issued on October 15, 2024, and 50% vested on October 15, 2025. The remaining 50% vested in two equal semi-annual installments through October 15, 2026.

The RSUs were issued October 15, 2024; the remaining 50% vested in two equal semi-annual installments through October 15, 2026.

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Form Type

Rhea-AI Filing Summary

Ribbon Communications Inc. EVP, Chief Financial Officer Eric S. Marmurek reported the conversion of 37,500 restricted stock units into 37,500 common shares on October 15, 2026, as the units vested. Ribbon withheld 14,756 common shares at $1.46 per share to satisfy tax withholding obligations related to vesting. Each RSU represented a contingent right to receive one common share.

Insider Trade Summary

37,500 shares exercised/converted

Exercise 3 txns

Insider Marmurek Eric S

Role EVP, Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units (RSUs) ^{F1, F3}	37,500	$0.00	$0.00
Exercise	Common Stock ^F1	37,500	--	--
Tax Withholding	Common Stock ^F2	14,756	$1.46	$22K

Holdings After Transaction: Restricted Stock Units (RSUs) — 0 contracts (Direct); Common Stock — 566,450 shares (Direct)

Footnotes (3)

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 vested in two equal semi-annual installments thereafter through October 15, 2026.

Key Figures

Restricted stock units converted: 37,500 RSUs Common shares acquired: 37,500 shares Common shares withheld: 14,756 shares +1 more

4 metrics

Restricted stock units converted 37,500 RSUs October 15, 2026

Common shares acquired 37,500 shares Upon RSU vesting on October 15, 2026

Common shares withheld 14,756 shares For tax withholding obligations upon vesting

Price per withheld share $1.46 per share Shares withheld on October 15, 2026

Key Terms

Restricted Stock Units (RSUs), tax withholding obligations, semi-annual installments

3 terms

Restricted Stock Units (RSUs) financial

"Restricted Stock Units (RSUs)"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

tax withholding obligations financial

"to satisfy tax withholding obligations in connection with the vesting"

semi-annual installments financial

"vested in two equal semi-annual installments"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RBBN shares did CFO Eric S. Marmurek receive, and how many were withheld?

Marmurek received 37,500 common shares when 37,500 RSUs vested on October 15, 2026. Ribbon withheld 14,756 shares at $1.46 per share to satisfy tax withholding obligations.

What was the vesting schedule for Eric S. Marmurek's RBBN RSUs?

The RSUs were issued on October 15, 2024, and 50% vested on October 15, 2025. The remaining 50% vested in two equal semi-annual installments through October 15, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/19/2026 - 09:10 AM EDT Accepted by SEC EDGAR 10/19/2026 - 09:10 AM EDT

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

TEXAS

75023

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/15/2026		M		37,500	A	⁽¹⁾	581,206	D
Common Stock	10/15/2026		F		14,756	D	$1.46⁽²⁾	566,450	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units (RSUs)	⁽¹⁾	10/15/2026		M			37,500	⁽³⁾	⁽³⁾	Common Stock	37,500	$0	0	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 vested in two equal semi-annual installments thereafter through October 15, 2026.

	Patrick Macken, By POA from Rick Marmurek	10/19/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR