WESTERMANN DONALD MICHAEL (Chief Information Officer) exercised options at EASTERN BANKSHARES, INC.

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

M · 1 exercise

WESTERMANN DONALD MICHAEL

Filed: 3/5/2026ACC: 0001193125-26-094123

InsiderWESTERMANN DONALD MICHAELCIK 1825585

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IssuerEASTERN BANKSHARES, INC.CIK 1810546

Officer· Chief Information Officer

Since Oct 2020

-961.00

Net shares

Net seller

$18.7K

Total sold

Open market trades

0B · 0S

Total transactions

2.17K acquired · 3.13K disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+2.17K

Price / share

—

Trade value

—

% of position

6.8%

3/3/2026

31.77K→33.93K

Common Stock

Direct

F · Tax Withholding

−961.00

Price / share

$19.45

Trade value

$18.69K

% of position

2.8%

3/3/2026

33.93K→32.97K

Total

Net shares

+1.20K

Net value

-$18.69K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/3/2026	M · Option Exercise	+2.17K	—	—	6.8%	31.77K	33.93K
Common Stock Direct	3/3/2026	F · Tax Withholding	−961.00	$19.45	$18.69K	2.8%	33.93K	32.97K
Total			+1.20K		-$18.69K

Derivative Transactions1

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common stock

2.17K shares

−2.17K

Strike price

Held after

32.53K

Exercisable

—

3/3/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common stock2.17K shares	3/3/2026	M · Option Exercise	−2.17K		—	32.53K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned4.92K

Common Stock

Indirect

Shares owned22.68K

Total

27.60K indirect27.60K

Security Title	Shares Owned	Ownership Type
Common Stock	4.92K	Indirect
Common Stock	22.68K	Indirect
Total	27.60K	27.60K indirect

Derivative Holdings (Post-Transaction)3

Restricted Stock Units

Direct

Underlying security

Common stock

Underlying shares

7.10K

Shares owned

7.10K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common stock

Underlying shares

2.90K

Shares owned

2.90K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common stock

Underlying shares

9.49K

Shares owned

9.49K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

19.48K

Owned

19.48K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
Restricted Stock Units Direct	Common stock	—	—	7.10K	7.10K
Restricted Stock Units Direct	Common stock	—	—	2.90K	2.90K
Restricted Stock Units Direct	Common stock	—	—	9.49K	9.49K
Total				19.48K	19.48K