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Ribbon Communications withholds EVP shares for taxes

The reported RSU positions after these transactions were 72,003 and 324,021 shares, respectively.

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Form Type
4

Rhea-AI Filing Summary

Ribbon Communications Inc. EVP, Global Sales Stephen J. McCaffery reported that 36,003 and 108,006 RSUs vested into common shares on October 31, 2026. The company withheld 16,921 and 50,762 shares, respectively, to satisfy tax withholding obligations; each withholding was reported at $1.55 per share. No Rule 10b5-1 plan is reported.

Insider McCaffery Stephen J.
Role EVP, Global Sales
Type Security Shares Price Value
Exercise Restructed Stock Unites (RSUs) F1, F3 36,003 $0.00 $0.00
Exercise RSUs F1, F4 108,006 $0.00 $0.00
Exercise Common Stock F1 36,003 -- --
Tax Withholding Common Stock F2 16,921 $1.55 $26K
Exercise Common Stock F1 108,006 -- --
Tax Withholding Common Stock F2 50,762 $1.55 $79K
Holdings After Transaction: Restructed Stock Unites (RSUs) — 72,003 contracts (Direct); RSUs — 324,021 contracts (Direct); Common Stock — 163,526 shares (Direct)
Holdings Before and After: Restructed Stock Unites (RSUs), 108,006 to 72,003 contracts (Direct); RSUs, 432,027 to 324,021 contracts (Direct); Common Stock, 87,200 to 163,526 shares (Direct)
Footnotes (4)
  1. F1. Eash RSU represents a contingent right to receive one share of the Registrant's common stock.
  2. F2. Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.
  3. F3. The RSUs were granted on October 31, 2025; the initial tranche vested on October 31, 2026 and the remaining RSUs will vest in four equal semi-annual installments thereafter through October 31, 2028.
  4. F4. The RSUs were granted on October 31, 2025; the initial tranche vested on October 31, 2026 and the remaining RSUs will vest in six equal semi-annual installments thereafter through October 31, 2029.
RSUs vested 36,003 RSUs October 31, 2026
RSUs vested 108,006 RSUs October 31, 2026
Common shares withheld 16,921 shares Tax withholding connected with vesting on October 31, 2026
Common shares withheld 50,762 shares Tax withholding connected with vesting on October 31, 2026
Reported withholding price $1.55 per share October 31, 2026
RSUs following transaction 72,003 RSUs Reported position after the October 31, 2026 transaction
RSUs following transaction 324,021 RSUs Reported position after the October 31, 2026 transaction
RSU technical
"Each RSU represents a contingent right to receive one share"
Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.
vesting financial
"tax withholding obligations in connection with the vesting"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
tax withholding obligations financial
"to satisfy tax withholding obligations"

FAQ

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

How many RSUs vested in RBBN insider Stephen J. McCaffery's Form 4?

Stephen J. McCaffery's reported RSU vesting on October 31, 2026 covered 36,003 and 108,006 RSUs, which converted into the same counts of common shares.

How many RBBN shares were withheld for taxes?

Ribbon Communications Inc. withheld 16,921 and 50,762 common shares, respectively, to satisfy tax withholding obligations tied to vesting; each was reported at $1.55 per share.

When are Stephen J. McCaffery's remaining RBBN RSUs scheduled to vest?

The 36,003 RSUs were granted on October 31, 2025, and the remaining RSUs are scheduled to vest in four equal semi-annual installments through October 31, 2028. The 108,006 RSUs were granted on that same date, with remaining RSUs scheduled to vest in six equal semi-annual installments through October 31, 2029.

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

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SEC Form 4
FORM 4UNITED 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*
McCaffery Stephen J.

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, Global Sales
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
10/31/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock10/31/2026M36,003A(1)123,203D
Common Stock10/31/2026F16,921D$1.55(2)106,282D
Common Stock10/31/2026M108,006A(1)214,288D
Common Stock10/31/2026F50,762D$1.55(2)163,526D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restructed Stock Unites (RSUs)(1)10/31/2026M36,003 (3) (3)Common Stock36,003$072,003D
RSUs(1)10/31/2026M108,006 (4) (4)Common Stock108,006$0324,021D
Explanation of Responses:
1. Eash RSU represents a contingent right to receive one share of the Registrant's common stock.
2. Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.
3. The RSUs were granted on October 31, 2025; the initial tranche vested on October 31, 2026 and the remaining RSUs will vest in four equal semi-annual installments thereafter through October 31, 2028.
4. The RSUs were granted on October 31, 2025; the initial tranche vested on October 31, 2026 and the remaining RSUs will vest in six equal semi-annual installments thereafter through October 31, 2029.
Patrick Macken, By POA from Stephen J. McCaffery11/03/2026
** Signature of Reporting PersonDate
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)

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