MARMUREK ERIC S (Principal Accounting Officer) exercised options at RIBBON COMMUNICATIONS INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 5 exercises

MARMUREK ERIC S

Filed: 5/19/2026ACC: 0001708055-26-000034

InsiderMARMUREK ERIC SCIK 1720721

→

IssuerRIBBON COMMUNICATIONS INC.CIK 1708055

Officer· Principal Accounting Officer

Since Nov 2018

-61.01K

Net shares

Net seller

$162.8K

Total sold

Open market trades

0B · 0S

Total transactions

154.81K acquired · 215.82K disposed

Non-Derivative Transactions10

Common Stock

Direct

M · Option Exercise

+48.33K

Price / share

—

Trade value

—

% of position

10.7%

4/17/2026

449.81K→498.13K

Common Stock

Direct

F · Tax Withholding

−19.11K

Price / share

$2.71

Trade value

$51.78K

% of position

3.8%

4/17/2026

498.23K→479.12K

Common Stock

Direct

M · Option Exercise

+25.65K

Price / share

—

Trade value

—

% of position

5.4%

4/17/2026

479.12K→504.77K

Common Stock

Direct

F · Tax Withholding

−10.09K

Price / share

$2.71

Trade value

$27.35K

% of position

2.0%

4/17/2026

504.77K→494.68K

Common Stock

Direct

M · Option Exercise

+23.15K

Price / share

—

Trade value

—

% of position

4.7%

5/15/2026

494.68K→517.82K

Common Stock

Direct

F · Tax Withholding

−9.11K

Price / share

$2.63

Trade value

$23.95K

% of position

1.8%

5/15/2026

517.28K→508.18K

Common Stock

Direct

M · Option Exercise

+31.65K

Price / share

—

Trade value

—

% of position

6.2%

5/15/2026

508.72K→540.36K

Common Stock

Direct

F · Tax Withholding

−12.45K

Price / share

$2.63

Trade value

$32.75K

% of position

2.3%

5/15/2026

540.36K→527.91K

Common Stock

Direct

M · Option Exercise

+26.04K

Price / share

—

Trade value

—

% of position

4.9%

5/15/2026

527.91K→553.95K

Common Stock

Direct

F · Tax Withholding

−10.25K

Price / share

$2.63

Trade value

$26.95K

% of position

1.8%

5/15/2026

553.95K→543.71K

Total

Net shares

+93.81K

Net value

-$162.78K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	4/17/2026	M · Option Exercise	+48.33K	—	—	10.7%	449.81K	498.13K
Common Stock Direct	4/17/2026	F · Tax Withholding	−19.11K	$2.71	$51.78K	3.8%	498.23K	479.12K
Common Stock Direct	4/17/2026	M · Option Exercise	+25.65K	—	—	5.4%	479.12K	504.77K
Common Stock Direct	4/17/2026	F · Tax Withholding	−10.09K	$2.71	$27.35K	2.0%	504.77K	494.68K
Common Stock Direct	5/15/2026	M · Option Exercise	+23.15K	—	—	4.7%	494.68K	517.82K
Common Stock Direct	5/15/2026	F · Tax Withholding	−9.11K	$2.63	$23.95K	1.8%	517.28K	508.18K
Common Stock Direct	5/15/2026	M · Option Exercise	+31.65K	—	—	6.2%	508.72K	540.36K
Common Stock Direct	5/15/2026	F · Tax Withholding	−12.45K	$2.63	$32.75K	2.3%	540.36K	527.91K
Common Stock Direct	5/15/2026	M · Option Exercise	+26.04K	—	—	4.9%	527.91K	553.95K
Common Stock Direct	5/15/2026	F · Tax Withholding	−10.25K	$2.63	$26.95K	1.8%	553.95K	543.71K
Total			+93.81K		-$162.78K

Derivative Transactions5

Performance Share Units (PSUs)

Direct

M · Option Exercise

Converts to

Common Stock

25.65K shares

−25.65K

Strike price

Held after

0.00

Exercisable

—

4/17/2026

PSUs

Direct

M · Option Exercise

Converts to

Common Stock

48.33K shares

−48.33K

Strike price

Held after

0.00

Exercisable

—

4/17/2026

PSUs

Direct

M · Option Exercise

Converts to

Common Stock

23.15K shares

−23.15K

Strike price

Held after

0.00

Exercisable

—

5/15/2026

RSUs

Direct

M · Option Exercise

Converts to

Common Stock

26.04K shares

−26.04K

Strike price

Held after

52.08K

Exercisable

—

5/15/2026

RSUs

Direct

M · Option Exercise

Converts to

Common Stock

31.65K shares

−31.65K

Strike price

Held after

31.64K

Exercisable

—

5/15/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Performance Share Units (PSUs) Direct	Common Stock25.65K shares	4/17/2026	M · Option Exercise	−25.65K	—	0.00
PSUs Direct	Common Stock48.33K shares	4/17/2026	M · Option Exercise	−48.33K	—	0.00
PSUs Direct	Common Stock23.15K shares	5/15/2026	M · Option Exercise	−23.15K	—	0.00
RSUs Direct	Common Stock26.04K shares	5/15/2026	M · Option Exercise	−26.04K	—	52.08K
RSUs Direct	Common Stock31.65K shares	5/15/2026	M · Option Exercise	−31.65K	—	31.64K