Avidia Bancorp director buys 5,000 shares

Avidia Bancorp, Inc. (AVBC) director Joseph F. Grimaldo reported purchasing 5,000 shares of common stock on 2026-08-26 in an open-market or private transaction at $22.0175 per share, held indirectly by a trust.

Rhea-AI Filing Summary

Avidia Bancorp, Inc. (AVBC) director Joseph F. Grimaldo reported purchasing 5,000 shares of common stock on 2026-08-26 in an open-market or private transaction at $22.0175 per share, held indirectly by a trust. After this purchase, that trust holds 49,655 shares, and a separate indirect holding listed as “By Spouse's Trust” holds 20,000 shares.

Insider Trade Summary

Net Buyer: 5,000 shares

Net Buy 2 txns

Insider Grimaldo Joseph F

Role Director

Bought 5,000 shs ($110K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$22.0175	$110K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 49,655 shares (Indirect, By Trust); Common Stock — 20,000 shares (Indirect, By Spouse's Trust)

Key Figures

Shares purchased: 5,000 shares of Common Stock Purchase price per share: $22.0175 per share Shares held by Trust after transaction: 49,655 shares +2 more

5 metrics

Shares purchased 5,000 shares of Common Stock Non-derivative purchase on 2026-08-26

Purchase price per share $22.0175 per share Price for 5,000-share common stock purchase on 2026-08-26

Shares held by Trust after transaction 49,655 shares Indirect ownership, nature of ownership: By Trust

Shares held by Spouse's Trust 20,000 shares Indirect ownership, nature of ownership: By Spouse's Trust

Net buy/sell shares 5,000 shares (net-buy) Aggregate of reported non-derivative buy/sell activity in this filing

Key Terms

indirect, By Trust, By Spouse's Trust, open market or private transaction

4 terms

indirect financial

"total_shares_following_transaction ... ownership_type": "indirect""

By Trust financial

"nature_of_ownership": "By Trust""

By Spouse's Trust financial

"nature_of_ownership": "By Spouse's Trust""

open market or private transaction financial

"transaction_code_description": "Purchase in open market or private transaction""

FAQ

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

What insider transaction did AVBC director Joseph F. Grimaldo report?

He reported a purchase of 5,000 shares of Avidia Bancorp, Inc. common stock on 2026-08-26, classified as an open-market or private transaction, held indirectly by a trust associated with him.

At what price did Joseph F. Grimaldo buy AVBC shares?

He purchased the 5,000 AVBC shares at a price of $22.0175 per share, as reported for the 2026-08-26 common stock transaction held indirectly by a trust.

How many AVBC shares does the trust associated with Joseph F. Grimaldo hold after the transaction?

Following the reported purchase, the trust associated with Joseph F. Grimaldo holds 49,655 shares of Avidia Bancorp, Inc. common stock as an indirect ownership position.

What additional AVBC holdings are reported for Joseph F. Grimaldo through a spouse’s trust?

A separate indirect holding labeled “By Spouse's Trust” is reported with 20,000 shares of Avidia Bancorp, Inc. common stock, shown as a holding entry without a new transaction on that date.

Was the AVBC insider transaction made under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not affirmed (set to false), so the reported 5,000-share purchase is not designated as occurring under a Rule 10b5-1 trading plan.

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

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Available on EDGAR 08/27/2026 - 02:24 PM EDT Accepted by SEC EDGAR 08/27/2026 - 02:23 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED 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^*

Grimaldo Joseph F

(Last) (First) (Middle)

42 MAIN ST

(Street)

HUDSON MASSACHUSETTS 01749

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Avidia Bancorp, Inc. [ AVBC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/26/2026		P		5,000	A	$22.0175	49,655	I	By Trust
Common Stock								20,000	I	By Spouse's Trust

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Victor L. Cangelosi, pursuant to power of attorney	08/27/2026
	** Signature of Reporting Person	Date
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)