Eric S. Marmurek

CIK: 0001720721

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)15 (37.5%)

Derivative conversions

Awards (A)10 (25.0%)

Compensation grants

Other (G, F, J, C, D, …)15 (37.5%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

RBBN

Ribbon Communications Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (40 total)

RBBN
Ribbon Communications Inc.
Oct 15, 2026
Tax Payment(F)
Direct
14.8K shares at avg. $1.46$22K
RBBN
Ribbon Communications Inc.
Oct 15, 2026
Exercise(M)
Direct
37.5K shares-
RBBN
Ribbon Communications Inc.
Jun 15, 2026
Award(A)
Restructed Stock Unites (RSUs)
Direct
150K shares-
RBBN
Ribbon Communications Inc.
Jun 15, 2026
Award(A)
Performance-Based RSUs (PSUs)
Direct
90K shares-
RBBN
Ribbon Communications Inc.
Jun 15, 2026
Award(A)
PSUs
Direct
60K shares-
RBBN
Ribbon Communications Inc.
May 15, 2026
Tax Payment(F)
Direct
10.2K shares at avg. $2.63$27K
RBBN
Ribbon Communications Inc.
May 15, 2026
Tax Payment(F)
Direct
9.1K shares at avg. $2.63$24K
RBBN
Ribbon Communications Inc.
May 15, 2026
Exercise(M)
Direct
31.6K shares-
RBBN
Ribbon Communications Inc.
May 15, 2026
Tax Payment(F)
Direct
12.5K shares at avg. $2.63$33K
RBBN
Ribbon Communications Inc.
May 15, 2026
Exercise(M)
Direct
26K shares-
RBBN
Ribbon Communications Inc.
May 15, 2026
Exercise(M)
Direct
23.1K shares-
RBBN
Ribbon Communications Inc.
Apr 17, 2026
Exercise(M)
Direct
48.3K shares-
RBBN
Ribbon Communications Inc.
Apr 17, 2026
Tax Payment(F)
Direct
19.1K shares at avg. $2.71$52K
RBBN
Ribbon Communications Inc.
Apr 17, 2026
Exercise(M)
Direct
25.7K shares-
RBBN
Ribbon Communications Inc.
Apr 17, 2026
Tax Payment(F)
Direct
10.1K shares at avg. $2.71$27K
RBBN
Ribbon Communications Inc.
Apr 15, 2026
Exercise(M)
Direct
37.5K shares-
RBBN
Ribbon Communications Inc.
Apr 15, 2026
Tax Payment(F)
Direct
14.8K shares at avg. $2.48$37K
RBBN
Ribbon Communications Inc.
Dec 15, 2025
Award(A)
Restricted Stock Units (RSUs)
Direct
169.7K shares-
RBBN
Ribbon Communications Inc.
Oct 15, 2025
Exercise(M)
Direct
75K shares-
RBBN
Ribbon Communications Inc.
Oct 15, 2025
Tax Payment(F)
Direct
29.5K shares at avg. $3.81$112K
RBBN
Ribbon Communications Inc.
May 16, 2025
Tax Payment(F)
Direct
12.5K shares at avg. $3.62$45K
RBBN
Ribbon Communications Inc.
May 16, 2025
Exercise(M)
Direct
31.6K shares-
RBBN
Ribbon Communications Inc.
May 15, 2025
Award(A)
Performance-Based RSUs (PSUs)
Direct
46.9K shares-
RBBN
Ribbon Communications Inc.
May 15, 2025
Award(A)
PSUs
Direct
36.4K shares-
RBBN
Ribbon Communications Inc.
May 15, 2025
Award(A)
Restricted Stock Units (RSUs)
Direct
78.1K shares-

		Type	Shares	Price		Ownership
Oct 15, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	14,756	$1.46	$21,544	Direct
Oct 15, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	37,500	-	$0	Direct
Jun 15, 2026	RBBN Ribbon Communications Inc.	Award(A) Restructed Stock Unites (RSUs)	150,000	-	-	Direct
Jun 15, 2026	RBBN Ribbon Communications Inc.	Award(A) Performance-Based RSUs (PSUs)	90,000	-	-	Direct
Jun 15, 2026	RBBN Ribbon Communications Inc.	Award(A) PSUs	60,000	-	-	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	10,247	$2.63	$26,950	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	9,107	$2.63	$23,951	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	31,646	-	$0	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	12,452	$2.63	$32,749	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	26,043	-	$0	Direct
May 15, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	23,146	-	$0	Direct
Apr 17, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	48,328	-	$0	Direct
Apr 17, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	19,107	$2.71	$51,780	Direct
Apr 17, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	25,651	-	$0	Direct
Apr 17, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	10,092	$2.71	$27,349	Direct
Apr 15, 2026	RBBN Ribbon Communications Inc.	Exercise(M)	37,500	-	$0	Direct
Apr 15, 2026	RBBN Ribbon Communications Inc.	Tax Payment(F)	14,756	$2.48	$36,595	Direct
Dec 15, 2025	RBBN Ribbon Communications Inc.	Award(A) Restricted Stock Units (RSUs)	169,721	-	-	Direct
Oct 15, 2025	RBBN Ribbon Communications Inc.	Exercise(M)	75,000	-	-	Direct
Oct 15, 2025	RBBN Ribbon Communications Inc.	Tax Payment(F)	29,512	$3.81	$112,441	Direct
May 16, 2025	RBBN Ribbon Communications Inc.	Tax Payment(F)	12,452	$3.62	$45,076	Direct
May 16, 2025	RBBN Ribbon Communications Inc.	Exercise(M)	31,645	-	-	Direct
May 15, 2025	RBBN Ribbon Communications Inc.	Award(A) Performance-Based RSUs (PSUs)	46,875	-	-	Direct
May 15, 2025	RBBN Ribbon Communications Inc.	Award(A) PSUs	36,392	-	-	Direct
May 15, 2025	RBBN Ribbon Communications Inc.	Award(A) Restricted Stock Units (RSUs)	78,125	-	-	Direct

1-25 of 40 transactions

About Marmurek Eric S

Marmurek Eric S (SEC CIK 0001720721) files insider reports with the SEC as EVP, Chief Financial Officer of Ribbon Communications Inc. (RBBN).

Signal8 holds 11 ownership filings by Marmurek Eric S, all Form 4s, filed between Oct 17, 2024 and Oct 19, 2026. Those filings report 40 transactions, from Mar 15, 2024 to Oct 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Marmurek Eric S's filings is in PLANO, TX.

Recent filings by Marmurek Eric S

Oct 15, 2026: Tax withholding of RBBN shares (Form 4, code F).
Oct 15, 2026: Option exercise of RBBN shares (Form 4, code M).
Jun 15, 2026: Grants or awards of RBBN derivative securities (3 lines, Form 4, code A).
May 15, 2026: Tax withholdings of RBBN shares (2 lines, Form 4, code F).
May 15, 2026: Option exercise of RBBN shares (Form 4, code M).

Other insiders filing for Ribbon Communications Inc. (RBBN)

McCaffery Stephen J., EVP, Global Sales
McClelland Bruce William, President & CEO
GRAYSON BRUNS H, Director
SHANI SHAUL, Director
Bucci Sam, EVP, Chief Operating Officer
Macken Patrick W, EVP, Chief Legal Officer

How to read Form 4 transaction codes