Avidia Bancorp (AVBC) director adds 4,655 shares via trust-held stock purchase

Rhea-AI Filing Summary

Avidia Bancorp, Inc. director Joseph F. Grimaldo reported a purchase of 4,655 shares of common stock on 2026-08-11 at $21.4364 per share. The acquired shares are held indirectly "By Trust", bringing that trust’s holdings to 44,655 shares. A separate indirect holding of 20,000 shares is reported as owned "By Spouse's Trust".

Insider Trade Summary

Net Buyer: 4,655 shares

Net Buy 2 txns

Insider Grimaldo Joseph F

Role Director

Bought 4,655 shs ($100K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	4,655	$21.4364	$100K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 44,655 shares (Indirect, By Trust); Common Stock — 20,000 shares (Indirect, By Spouse's Trust)

Key Figures

Shares purchased: 4,655 shares Purchase price: $21.4364 per share Trust holdings after transaction: 44,655 shares +2 more

5 metrics

Shares purchased 4,655 shares Common Stock acquired on 2026-08-11

Purchase price $21.4364 per share Common Stock purchase on 2026-08-11

Trust holdings after transaction 44,655 shares Indirect ownership "By Trust" following purchase

Spouse's trust holdings 20,000 shares Indirect ownership "By Spouse's Trust" reported as a holding entry

Net buy shares 4,655 shares Net buy direction across reported transactions

Key Terms

indirect ownership, By Trust, By Spouse's Trust

3 terms

indirect ownership financial

"The filing categorizes these positions as indirect ownership "By Trust" and "By Spouse's Trust"."

By Trust financial

"total_shares_following_transaction are 44,655 with nature of ownership listed as "By Trust"."

By Spouse's Trust financial

"A separate holding entry reports 20,000 shares with nature of ownership "By Spouse's Trust"."

FAQ

What insider transaction did Avidia Bancorp (AVBC) report for Joseph F. Grimaldo?

Avidia Bancorp reported that director Joseph F. Grimaldo purchased 4,655 shares of common stock on 2026-08-11. The transaction was coded as a purchase in open market or private transaction and is held indirectly by a trust.

At what price did Joseph F. Grimaldo buy AVBC shares in this Form 4?

Joseph F. Grimaldo bought 4,655 AVBC common shares at a price of $21.4364 per share. The filing notes this as a purchase in an open market or private transaction, with the shares held indirectly by a trust.

How many AVBC shares does Joseph F. Grimaldo’s trust hold after the reported transaction?

After the transaction, the trust associated with Joseph F. Grimaldo holds 44,655 shares of Avidia Bancorp common stock. This reflects the previously held position plus the newly purchased 4,655 shares reported in the Form 4 filing.

What indirect holdings related to Avidia Bancorp (AVBC) are reported for Joseph F. Grimaldo?

The Form 4 reports 44,655 shares of AVBC common stock held indirectly "By Trust" for Joseph F. Grimaldo, and an additional 20,000 shares held indirectly "By Spouse's Trust", both categorized as indirect ownership positions.

Was the AVBC Form 4 transaction by Joseph F. Grimaldo under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not marked as an affirming plan (aff_10b5_one is false). The transaction is therefore not identified in this report as executed pursuant to a Rule 10b5-1 trading plan.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 03:00 PM Accepted by SEC EDGAR 08/12/2026 - 02:59 PM 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)
08/11/2026

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	08/11/2026		P		4,655	A	$21.4364	44,655	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	08/12/2026
	** 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)