Ribbon director exercises 42,500 RSUs, gets new grant

Ribbon Communications Inc. director H. Bruns Grayson reported compensation-related equity activity.

Rhea-AI Filing Summary

Ribbon Communications Inc. director H. Bruns Grayson reported compensation-related equity activity. On June 16, 2026, he exercised 42,500 RSUs, receiving the same number of common shares and bringing his direct holdings to 825,847 shares of common stock.

On June 15, 2026, he was granted 63,197 new Restricted Stock Units (RSUs), each representing one share of common stock. These RSUs vest on June 15, 2027, subject to continued board service, or earlier on the date of the company’s 2027 annual stockholder meeting if he does not continue on the board then.

Insider Trade Summary

42,500 shares exercised/converted

Exercise 3 txns

Insider GRAYSON BRUNS H

Role Director

Type	Security	Shares	Price	Value
Exercise	RSUs	42,500	$0.00	$0.00
Exercise	Common Stock	42,500	$0.00	$0.00
Grant/Award	Restricted Stock Units (RSUs)	63,197	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units (RSUs) — 63,197 contracts (Direct); RSUs — 0 contracts (Direct); Common Stock — 825,847 shares (Direct)

Footnotes (3)

1. F1. Each RSU represents a contingent right to receive one share of the Issuer's common stock.
2. 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.
3. F3. The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Key Figures

RSUs exercised into common stock: 42,500 shares New RSU grant: 63,197 units Shares owned after transactions: 825,847 shares +1 more

4 metrics

RSUs exercised into common stock 42,500 shares Exercise of RSUs into common stock on June 16, 2026

New RSU grant 63,197 units Restricted Stock Units granted on June 15, 2026

Shares owned after transactions 825,847 shares Common stock directly held after June 16, 2026 exercise

RSU vesting date June 15, 2027 Scheduled vesting date for 63,197 RSUs, subject to board service

Key Terms

Restricted Stock Units (RSUs), derivative security, vest, contingent right

4 terms

Restricted Stock Units (RSUs) financial

"Restricted Stock Units (RSUs) were granted and later exercised into common stock."

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.

derivative security financial

"Transaction code M is described as an exercise or conversion of derivative security."

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

vest financial

"The RSUs will vest on June 15, 2027, subject to continued service."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

contingent right financial

"Each RSU represents a contingent right to receive one share of common stock."

FAQ

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

What insider transactions did Ribbon Communications (RBBN) director H. Bruns Grayson report?

H. Bruns Grayson reported equity compensation activity, not open-market trading. He exercised 42,500 RSUs into common shares and received a new grant of 63,197 RSUs, all as part of his director compensation structure.

How many Ribbon Communications (RBBN) shares does H. Bruns Grayson hold after these Form 4 transactions?

After exercising RSUs, H. Bruns Grayson directly holds 825,847 shares of Ribbon Communications common stock. This figure reflects his updated ownership position following the June 16, 2026 equity compensation transaction reported on Form 4.

What RSU grant did H. Bruns Grayson receive from Ribbon Communications (RBBN)?

On June 15, 2026, H. Bruns Grayson received a grant of 63,197 Restricted Stock Units from Ribbon Communications. Each RSU represents a contingent right to receive one share of common stock, subject to the vesting conditions described in the filing’s footnotes.

When do H. Bruns Grayson’s new Ribbon Communications (RBBN) RSUs vest?

The 63,197 RSUs vest on June 15, 2027 if Grayson continues serving on the board. If the 2027 annual stockholder meeting occurs earlier and he does not continue on the board, they vest on the meeting date instead.

Did H. Bruns Grayson buy or sell Ribbon Communications (RBBN) shares on the market?

No open-market buys or sells were reported. The Form 4 reflects an RSU exercise that converted 42,500 RSUs into common shares and a new RSU grant, both categorized as equity compensation, not market transactions.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:40 PM EDT Learn about SEC filing dates

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^*

GRAYSON BRUNS H

(Last) (First) (Middle)

C/O RIBBON COMMUNICATIONS

6500 CHASE OAKS BLVD.

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/16/2026		M		42,500	A	(1)	825,847	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units (RSUs)	(1)	06/15/2026		A		63,197		(2)	(2)	Common Stock	63,197	$0	63,197	D
RSUs	(1)	06/16/2026		M			42,500	(3)	(3)	Common Stock	42,500	$0	0	D

Explanation of Responses:

1. Each RSU represents a contingent right to receive one share of the Issuer's common stock.

2. 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.

3. The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

	Patrick Macken, By POA from Bruns Grayson, Director	06/17/2026
	** 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)