SHEAHAN DENIS K 4

4 · Eastern Bankshares, Inc. · Filed Mar 5, 2026

Insider Transaction Report

Form 4

Period: 2026-03-03

Eastern Bankshares, Inc.EBC

SHEAHAN DENIS K

DirectorChief Executive Officer

Transactions

Exercise/Conversion
Common Stock
[F2]
2026-03-03+34,065→ 34,065 total
Tax Payment
Common Stock
2026-03-03$19.45/sh−15,184$295,329→ 18,881 total
Exercise/Conversion
Restricted Stock Units
[F2][F10]
2026-03-03−34,065→ 120,023 total
→ Common stock (34,065 underlying)

Holdings

Common Stock
(indirect: By Trust)
250,781
Common Stock
(indirect: By IRA)
33,305
Common Stock
[F12]
(indirect: By ESOP)
889
Restricted Stock Units
[F1][F2][F3]
→ Common stock (3,232 underlying)
3,232
Restricted Stock Units
[F1][F2][F4]
→ Common stock (11,241 underlying)
11,241
Restricted Stock Units
[F1][F2][F5]
→ Common stock (34,544 underlying)
34,544
Restricted Stock Units
[F1][F2][F6]
→ Common stock (33,721 underlying)
33,721
Restricted Stock Units
[F1][F2][F7]
→ Common stock (42,221 underlying)
42,221
Restricted Stock Units
[F8][F9][F13]
→ Common stock (17,215 underlying)
17,215
Restricted Stock Units
[F8][F11]
→ Common stock (24,340 underlying)
24,340

Footnotes (13)

[F1]Eastern Bankshares, Inc. (the "Company") issued these time-based restricted stock units ("RSUs") as of July 12, 2024, when the Company completed a merger with Cambridge Bancorp ("Cambridge"). Pursuant to the terms of the Agreement and Plan of Merger, dated September 19, 2023, Cambridge RSUs and performance-based restricted stock units ("PRSUs") were assumed and converted to Company RSUs at an exchange ratio of 4.956 Company units for each Cambridge unit.
[F10]On March 3, 2025, the reporting person was granted 154,088 restricted stock units of which 24,365 vest in three equal annual installments beginning March 3, 2026 after market close, and 129,723 vest in five equal installments beginning on March 3, 2026, after market close, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
[F11]On March 2, 2026, the reporting person was granted 24,340 restricted stock units that vest in three equal annual installments beginning March 2, 2027, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.
[F12]Reflects the amount of shares beneficially owned, including shares received due to automatic dividend reinvestment, as of the date of this report.
[F13]The reporting person's immediately preceding Form 4, filed on March 3, 2026, inadvertently overstated the amount of derivative securities beneficially owned by 8,606 shares. The amount shown in this table corrects the inadvertent clerical error.
[F2]Restricted stock units convert into common stock on a one-for-one basis.
[F3]This award for 3,232 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on February 15, 2021, that vested in three equal annual installments beginning one year after the grant date. The reporting person elected to defer receipt of common stock issuable upon the vesting of these RSUs.
[F4]This award for 11,241 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on February 15, 2022, that provided for vesting in three equal annual installments beginning one year after the grant date. The final tranche of this Company RSU award vested on February 15, 2025. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
[F5]This award for 34,544 Company RSUs replaced an award of Cambridge RSUs granted to the reporting person on April 28, 2023, that provided for vesting in three equal annual installments beginning one year after the grant date. Subject to continued service, the remaining tranches will vest on April 28 of 2025 and 2026, respectively. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
[F6]This award for 33,721 Company RSUs replaced an award of Cambridge PRSUs granted to the reporting person on February 15, 2022. The Company RSU award provided for cliff vesting on December 31, 2024. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
[F7]This award for 42,221 Company RSUs replaced an award of Cambridge PRSUs that Cambridge granted to the reporting person on April 28, 2023. Subject to continued service, the Company RSU award provides for cliff vesting on December 31, 2025. The reporting person elected to defer receipt of common stock issuable upon vesting except for shares withheld for tax obligations.
[F8]Each restricted stock unit represents a contingent right to receive one share of Company common stock on the applicable vesting date.
[F9]On September 3, 2024, the reporting person was granted 25,821 restricted stock units that vest in three equal annual installments beginning September 3, 2025, subject to continued service. Vested shares will be issued to the reporting person as soon as practicable after the vesting date.

Signature

/s/ Kathleen R. Henry, by Power of Attorney|2026-03-05

Documents

1 file

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ownership.xmlPrimary
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