[Form 4] Ribbon Communications Inc. Insider Trading Activity

Rhea-AI Filing Summary

Dan Redington, EVP, Global Sales of Ribbon Communications Inc. (RBBN), reported three separate open-market sales of the issuer's common stock in early September 2025. The filings show sales of 20,000 shares on 09/04/2025 at a weighted-average price of $4.1626, 155,434 shares on 09/05/2025 at a weighted-average price of $4.0297, and 14,176 shares on 09/08/2025 at $4.02. Aggregate shares sold equal 189,610. The reported beneficial ownership after each sale moved from 169,610 shares to 14,176 shares and then to 0 shares (direct ownership). Footnotes state the first two prices are weighted averages with transaction ranges provided on the form. The Form 4 is signed by a power of attorney, Patrick Macken, dated 09/08/2025.

Positive

• Complete Section 16 disclosure with transaction dates, quantities, and weighted-average prices included
• Explanatory footnotes disclose price ranges and commit to provide detailed per-price counts upon request
• Form signed via POA (Patrick Macken) with a date, indicating attestation of the report

Negative

• Insider sold all reported direct holdings (aggregate 189,610 shares), leaving reported direct ownership at 0
• Large volume of sales relative to the officer's previously reported holdings (decline from 169,610 to 0) which is material information for shareholders

Insights

Financial Analyst

TL;DR: Senior officer sold 189,610 RBBN shares across three trades in early September 2025; filing discloses weighted-average prices and remaining direct ownership reached zero.

The reported transactions are sizeable in absolute terms: total shares sold were 189,610, executed at weighted-average prices of $4.1626, $4.0297 and $4.02. The Form 4 shows a step-down in direct beneficial ownership from 169,610 to 14,176 and then to 0. For investors, the items of record are the volume sold and confirmed weighted-average pricing ranges disclosed in the footnotes. The filing is complete and includes a POA signature, meeting Section 16 reporting requirements.

Corporate Governance Expert

TL;DR: Insider compliance appears timely and detailed; the Form 4 includes weighted-average price disclosures and a POA signature dated 09/08/2025.

The Form 4 provides clear transaction codes and explanatory footnotes indicating weighted-average price ranges for the sales, which supports transparency. The filing was executed by a power of attorney, with the signature block indicating proper attestation. From a governance and disclosure perspective, the document contains the necessary elements to satisfy reporting obligations without additional qualifiers.

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^*

Redington Dan

(Last) (First) (Middle)

6500 CHASE OAKS BOULEVARD

SUITE 100

(Street)

PLANO TX 75023

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Ribbon Communications Inc. [ RBBN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Global Sales

3. Date of Earliest Transaction (Month/Day/Year)
09/04/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	09/04/2025		S		20,000	D	$4.1626(1)	169,610	D
Common Stock	09/05/2025		S		155,434	D	$4.0297(2)	14,176	D
Common Stock	09/08/2025		S		14,176	D	$4.02	0	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

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.16 to $4.165, inclusive. The reporting person undertakes to provide to Ribbon Communications, any security holder of Ribbon Communications, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in this footnote.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.965 to $4.160, inclusive. The reporting person undertakes to provide to Ribbon Communications, any security holder of Ribbon Communications, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in this footnote.

	Patrick Macken, By POA from Dan Redington, EVP of Global Sales	09/08/2025
	** 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.

FAQ

What transactions did Dan Redington report on the Form 4 for RBBN?

The Form 4 reports three open-market sales: 20,000 shares on 09/04/2025 at a weighted-average price of $4.1626, 155,434 shares on 09/05/2025 at $4.0297, and 14,176 shares on 09/08/2025 at $4.02.

How many total RBBN shares did the reporting person sell?

The reporting person sold an aggregate of 189,610 shares across the three reported transactions.

What was the reported beneficial ownership after the sales?

The form shows direct beneficial ownership following the reported transactions moved from 169,610 shares to 14,176 shares and then to 0 shares.

Are the sale prices precise single prices or weighted averages?

The Form 4 indicates the prices for the 09/04/2025 and 09/05/2025 sales are weighted-average prices with ranges provided in the footnotes; the 09/08/2025 price is reported as $4.02.

Who signed the Form 4 and when?

The Form 4 is signed by Patrick Macken, by power of attorney for Dan Redington, dated 09/08/2025.