[Form 4] Avidia Bancorp, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Robert D. Cozzone, President & CEO and a director of Avidia Bancorp, Inc. (AVBC), reported transactions on 08/26/2025. The Form 4 shows a purchase of 6,631 shares of the issuer's common stock at a reported price of $15.0806 per share and a disposition of 1,000 shares on the same date. Following these transactions, the filing reports 27,088 shares beneficially owned indirectly through a 401(k) plan. The form was signed under power of attorney on 08/27/2025.

Positive

• CEO increased holdings via acquisition of 6,631 shares at $15.0806, indicating insider purchase activity
• Clear disclosure of relationship (President & CEO and Director) and ownership form (indirect via 401(k))

Negative

• Concurrent disposition of 1,000 shares on the same date reduces the net increase
• Form provides no context on purpose of trades or relation to company events beyond 401(k) designation

Insights

Financial Analyst

TL;DR: CEO reported a net purchase of company stock on 08/26/2025, increasing indirect holdings to 27,088 shares.

The reported purchase of 6,631 shares at $15.0806 and the concurrent disposition of 1,000 shares result in a net increase in reported holdings. As the filing lists these shares as indirectly owned via a 401(k), the transaction appears to reflect personal retirement-plan activity rather than an open-market accumulation for strategic ownership change. The transaction sizes and price are explicit in the filing; no earnings or other company financials are included.

Corporate Governance Expert

TL;DR: Insider activity disclosed by the CEO is routine Section 16 reporting; it shows both a purchase and a small sale tied to personal arrangements.

The Form 4 clearly identifies Robert D. Cozzone as President & CEO and a director, and reports acquisitions and dispositions dated 08/26/2025. The ownership is reported as indirect via a 401(k), which typically indicates plan-managed holdings. The filing was executed under power of attorney, with no amendments or additional disclosures provided. There are no governance actions or material corporate events disclosed in this submission.

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
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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^*

Cozzone Robert D

(Last) (First) (Middle)

42 MAIN ST

(Street)

HUDSON MA 01749

(City) (State) (Zip)

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
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	08/26/2025		P		6,631	A	$15.0806	27,088	I	By 401(k)
Common Stock								1,000	D

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	08/27/2025
	** 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.

FAQ

What did AVBC insider Robert D. Cozzone report on Form 4?

The Form 4 reports a purchase of 6,631 shares at $15.0806 and a disposition of 1,000 shares, with 27,088 shares owned indirectly via a 401(k).

When were the transactions for AVBC reported?

The transactions are dated 08/26/2025 and the Form 4 was signed under power of attorney on 08/27/2025.

What position does the reporting person hold at AVBC?

The reporting person, Robert D. Cozzone, is listed as President & CEO and a director of Avidia Bancorp, Inc.

How many shares does the filing state are beneficially owned after the transaction?

The filing reports 27,088 shares beneficially owned following the reported transactions, held indirectly by a 401(k).

Was the Form 4 filed jointly or by one reporting person for AVBC?

The form indicates it was filed by one reporting person.