Eastern Bankshares CIO plans $493K stock sale

Eastern Bankshares CIO files Rule 144 notice to resell 23,005 EBC shares valued at about $493,000, following recent insider sales.

Rhea-AI Filing Summary

Eastern Bankshares, Inc. (EBC) received a Rule 144 notice for a planned resale of its common stock by Chief Information Officer Donald Michael Westermann. The notice covers 23,005 shares to be sold through Stifel Nicolaus & Company Inc. on NASDAQ, with an aggregate market value of $492,929.62 as of September 1, 2026. In the prior three months, Westermann sold 10,407 shares for $226,565.59. The notice is signed on his behalf by Kathleen R. Henry under a power of attorney.

Key Figures

Planned shares to be sold: 23,005 shares Aggregate market value of planned sale: $492,929.62 Shares sold in past 3 months: 10,407 shares +2 more

5 metrics

Planned shares to be sold 23,005 shares Common stock to be sold under Rule 144 by CIO Donald Michael Westermann

Aggregate market value of planned sale $492,929.62 Market value of 23,005 shares as of September 1, 2026

Shares sold in past 3 months 10,407 shares Common stock sold on September 1, 2026

Proceeds from shares sold in past 3 months $226,565.59 Total proceeds from 10,407 shares sold on September 1, 2026

IPO acquisition date of securities October 14, 2020 Date the common stock was acquired in the IPO

Key Terms

Rule 144, aggregate market value, Power of Attorney

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

aggregate market value financial

"Common ... 23005 | 492929.62"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Power of Attorney regulatory

"Signature | /s/ Kathleen R. Henry, by Power of Attorney"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

FAQ

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

What does the Form 144 filing disclose for Eastern Bankshares, Inc. (EBC)?

The filing discloses that Chief Information Officer Donald Michael Westermann plans to sell 23,005 shares of Eastern Bankshares common stock under Rule 144 through Stifel Nicolaus & Company Inc. on NASDAQ, with an aggregate market value of $492,929.62 as of September 1, 2026.

How many Eastern Bankshares (EBC) shares has the insider already sold recently?

Over the past three months, Donald Michael Westermann sold 10,407 shares of Eastern Bankshares common stock on September 1, 2026 for total proceeds of $226,565.59, as disclosed in the Form 144 notice.

Who is selling Eastern Bankshares (EBC) shares under this Form 144?

The seller is Donald Michael Westermann, identified as the Chief Information Officer of Eastern Bankshares, Inc. The Form 144 is signed on his behalf by Kathleen R. Henry under a power of attorney.

Which broker will handle the planned Rule 144 sale for Eastern Bankshares (EBC)?

The planned Rule 144 sale of Eastern Bankshares common stock will be executed through Stifel Nicolaus & Company Inc., located in St. Louis, Missouri, with the securities listed for trading on NASDAQ.

What is the nature and origin of the Eastern Bankshares (EBC) shares to be sold?

The securities are common stock of Eastern Bankshares, Inc., originally acquired in connection with the company’s IPO on October 14, 2020, and are being sold for cash under Rule 144.

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

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Available on EDGAR 09/02/2026 - 09:59 PM EDT Accepted by SEC EDGAR 09/02/2026 - 09:59 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001825585
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Eastern Bankshares, Inc.
SEC File Number	001-39610
Address of Issuer	125 High Street Boston MASSACHUSETTS 2110
Phone	800-327-8376
Name of Person for Whose Account the Securities are To Be Sold	Donald Michael Westermann
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Chief Information Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Stifel Nicolaus & Company Inc. 501 N Broadway St. Louis MO 63102	23005	492929.62	0	09/01/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/14/2020	IPO	Issuer			23005	10/14/2020	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Donald Michael Westermann 125 High Street Boston MA 02110	Common	09/01/2026	10407	226565.59

144: Remarks and Signature

Remarks
Date of Notice	09/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Kathleen R. Henry, by Power of Attorney
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)