Key facts
- This page summarizes Eric S. Marmurek's Form 4 filing for Ribbon Communications Inc. (RBBN).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 17 Apr 2026, 08:39.
Eric S. Marmurek - 15 Apr 2026 Form 4 Insider Report for Ribbon Communications Inc. (RBBN)
- Reporting relationship
- SVP, Deputy CFO and CAO
- Issuer ticker
- RBBN
- Reported as of
- 15 Apr 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 17 Apr 2026, 08:39:30 UTC
- Prior SEC filing
- 16 Dec 2025
- Next SEC filing
- 19 May 2026
- Source filing
- View source filing
- Reporting owner signature
- Patrick Macken, By POA from Rick Marmurek
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 17 Apr 2026.
Change
- Previous filing in this sequence was filed on 16 Dec 2025.
- 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
- SVP, Deputy CFO and CAO
- Address
- 6500 CHASE OAKS BLVD., STE. 100, PLANO
- Signature
- Patrick Macken, By POA from Rick Marmurek
- Signature date
- 17 Apr 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
- +37,500
- Change %
- +8.8%
- Price
- Shares after
- 464,563
- Date
- 15 Apr 2026
- Ownership
- Direct
- Footnotes
- F1
RBBN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -14,756
- Change %
- -3.2%
- Price
- $2.48*
- Shares after
- 449,807
- Date
- 15 Apr 2026
- Ownership
- Direct
- Footnotes
- F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
RBBN
transaction
Derivative
Restricted Stock Units (RSUs)
Options Exercise
- Transaction value
- Shares
- -37,500
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 37,500
- Date
- 15 Apr 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 37,500
- Exercise price
- Footnotes
- F1, F3
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 3 footnotes
Footnote F1
Eash RSU represents a contingent right to receive one share of the Registrant's common stock.
Footnote F2
Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.
Footnote F3
The RSUs were issued on October 15, 2024. The remaining RSUs vest on October 15, 2026.