EWING R STEWART JR 4

4 · Ribbon Communications Inc. · Filed Jun 17, 2026

AI-generated summary of this filing

Updated Jun 17, 2026

Ribbon (RBBN) Director Ewing R. Stewart Receives RSUs, Converts 42,500

What Happened

Ewing R. Stewart Jr., a director of Ribbon Communications (RBBN), was granted 63,197 restricted stock units (RSUs) on June 15, 2026 (recorded at $0.00). On June 16, 2026, 42,500 RSUs from a prior award vested, were converted/exercised into shares and those 42,500 shares were immediately disposed per the Form 4 filing. No cash amounts or market values are reported for these transactions.

Key Details

Transactions:
- 2026-06-15: Grant of 63,197 RSUs (Code A) at $0.00 (award).
- 2026-06-16: Conversion/exercise of derivative (Code M) for 42,500 shares (acquired), and 42,500 shares disposed (both reported at $0.00).
Shares owned after the transactions: not disclosed in the filing.
Footnotes from the filing:
- F1: Each RSU represents a contingent right to receive one share of common stock.
- F2: The 63,197 RSUs have vesting conditions (generally vest June 15, 2027, subject to continued service; accelerated vesting if certain board/reelection conditions occur).
- F3: The 42,500 RSUs that converted/vested were from an award made June 16, 2025 that vested in full on June 16, 2026.
Filing timeliness: Form 4 was filed June 17, 2026; this appears to be timely (within the usual two-business-day reporting window).

Context

RSUs are derivative awards that convert into actual shares upon vesting. The conversion and immediate disposal of vested RSUs is commonly done to satisfy tax-withholding obligations or to net-settle awards; such disposals are routine and do not necessarily indicate the director’s market view. No cash purchase (bullish) transaction was reported.

Form 4

Period: 2026-06-15

Director

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-06-16+42,500→ 239,891 total
Award
Restricted Stock Units (RSUs)
[F1][F2]
2026-06-15+63,197→ 63,197 total
→ Common Stock (63,197 underlying)
Exercise/Conversion
RSUs
[F1][F3]
2026-06-16−42,500→ 0 total
→ Common Stock (42,500 underlying)

Footnotes (3)

[F1]Each RSU represents a contingent right to receive one share of the Issuer's common stock.
[F2]The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.
[F3]The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Signature

Patrick Macken, By POA from R. Stewart Ewing Jr.|2026-06-17

1 file