Key facts
- This page summarizes Eric S. Marmurek's Form 4 filing for Ribbon Communications Inc. (RBBN).
- 15 reported transactions and 5 derivative rows are listed below.
- Accepted by SEC: 19 May 2026, 08:12.
Eric S. Marmurek - 17 Apr 2026 Form 4 Insider Report for Ribbon Communications Inc. (RBBN)
- Reporting relationship
- EVP, Chief Financial Officer
- Issuer ticker
- RBBN
- Reported as of
- 17 Apr 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 19 May 2026, 08:12:16 UTC
- Prior SEC filing
- 17 Apr 2026
- Next SEC filing
- 17 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- Patrick Macken, By POA for Rick Marmurek, EVP, CFO
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Eric S. Marmurek filed Form 4 for Ribbon Communications Inc. (RBBN) on 19 May 2026.
Change
- Previous filing in this sequence was filed on 17 Apr 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001720721
Primary reporting owner
Marmurek Eric S
- Relationship
- EVP, Chief Financial Officer
- Address
- 6500 CHASE OAKS BLVD., STE. 100, PLANO
- Signature
- Patrick Macken, By POA for Rick Marmurek, EVP, CFO
- Signature date
- 19 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
RBBN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +48,328
- Change %
- +11%
- Price
- Shares after
- 498,135
- Date
- 17 Apr 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -19,107
- Change %
- -3.8%
- Price
- $2.71*
- Shares after
- 479,118
- Date
- 17 Apr 2026
- Ownership
- Direct
- Footnotes
- F2
RBBN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +25,651
- Change %
- +5.4%
- Price
- Shares after
- 504,769
- Date
- 17 Apr 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -10,092
- Change %
- -2%
- Price
- $2.71*
- Shares after
- 494,677
- Date
- 17 Apr 2026
- Ownership
- Direct
- Footnotes
- F2
RBBN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +23,146
- Change %
- +4.7%
- Price
- Shares after
- 517,823
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -9,107
- Change %
- -1.8%
- Price
- $2.63*
- Shares after
- 508,176
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F2
RBBN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +31,646
- Change %
- +6.2%
- Price
- Shares after
- 540,362
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -12,452
- Change %
- -2.3%
- Price
- $2.63*
- Shares after
- 527,910
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F2
RBBN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +26,043
- Change %
- +4.9%
- Price
- Shares after
- 553,953
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -10,247
- Change %
- -1.8%
- Price
- $2.63*
- Shares after
- 543,706
- Date
- 15 May 2026
- Ownership
- Direct
- Footnotes
- F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
RBBN
transaction
Derivative
Performance Share Units (PSUs)
Options Exercise
- Transaction value
- Shares
- -25,651
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 17 Apr 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 25,651
- Exercise price
- Footnotes
- F1, F3
RBBN
transaction
Derivative
PSUs
Options Exercise
- Transaction value
- Shares
- -48,328
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 17 Apr 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 48,328
- Exercise price
- Footnotes
- F1, F4
RBBN
transaction
Derivative
PSUs
Options Exercise
- Transaction value
- Shares
- -23,146
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 23,146
- Exercise price
- Footnotes
- F1, F5
RBBN
transaction
Derivative
RSUs
Options Exercise
- Transaction value
- Shares
- -26,043
- Change %
- -33%
- Price
- $0.000000*
- Shares after
- 52,082
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 26,043
- Exercise price
- Footnotes
- F1, F6
RBBN
transaction
Derivative
RSUs
Options Exercise
- Transaction value
- Shares
- -31,646
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 31,645
- Date
- 15 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 31,646
- Exercise price
- Footnotes
- F1, F7
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 7 footnotes
Footnote F1
Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.
Footnote F2
Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of the awards.
Footnote F3
The number of PSUs earned and issued upon vesting was determined based on goals (set by the Compensation Committee of the Issuer's Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years ended December 31, 2025. Based on the Compensation Committee's determination of achievement of these pre-established financial goals, 32%, 70% and 36% of the shares subject to the 2023, 2024 and 2025 financial periods, respectively, were earned and vested on April 17, 2026.
Footnote F4
The number of PSUs earned and issued upon vesting was determined based on the Issuer's total shareholder return (TSR) compared to pre-established relative TSR goals, based on the TSR of a peer index of companies (set by the Compensation Committee at the time of grant) over the three fiscal years ended December 31, 2025. Based on the Compensation Committee's determination of achievement of the pre-established TSR goal, 130% of the shares subject to the PSU award were earned and vested on April 17, 2026.
Footnote F5
The number of PSUs earned and issued upon vesting was determined based on goals (set by the Compensation Committee on an annual basis) for each of the two fiscal years ended December 31, 2025. Based on the Compensation Committee's determination of achievement of these pre-established financial goals, 70% and 36% of the shares subject to the 2024 and 2025 financial periods, respectively, were earned and vested on May 15, 2026.
Footnote F6
The RSUs were granted on May 15, 2025 and vested as to one-third on May 15, 2026; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through May 15, 2028.
Footnote F7
The RSUs were granted on May 15, 2025 and vested as to one-half on May 15, 2026; the remaining one-half of the RSUs will vest in two equal semi-annual installments thereafter through May 15, 2027.