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

Rhea-AI Filing Summary

Insider transactions at Avidia Bancorp (AVBC): Jonathan M. Nelson, CFO and Treasurer, reported a purchase of 6,631 shares of Avidia common stock on 08/26/2025 at $15.0806 per share and a contemporaneous sale of 7,000 shares. After the transactions he beneficially owns 16,554 shares indirectly through a 401(k). The Form 4 was signed via power of attorney on 08/27/2025.

Positive

• Purchase disclosed of 6,631 shares at $15.0806, showing continued insider participation in company stock
• Timely filing with signature via power of attorney on 08/27/2025, satisfying Section 16 reporting requirements

Negative

• Sale of 7,000 shares on the same date which reduces the insider's liquid holdings
• Holdings are indirect (via 401(k)), indicating limited direct control or voting influence

Insights

Securities Analyst

TL;DR: Insider executed small buy and sell on same day; net position remains modest and held indirectly through a 401(k).

The reported purchase of 6,631 shares at $15.0806 and sale of 7,000 shares on the same date indicates routine portfolio activity rather than a substantial change in control or strategy. The reporting person holds 16,554 shares indirectly via a retirement account, which suggests limited direct influence on corporate decisions. No derivatives or additional material transactions are reported.

Corporate Governance Expert

TL;DR: Transaction appears routine and small relative to typical market-moving insider trades.

As CFO and Treasurer, the officer's disclosure is required and timely. The mix of a purchase and a sale on 08/26/2025 with remaining indirect ownership through a 401(k) points to personal portfolio management under standard insider reporting rules. There is no indication of planned trading arrangements or option exercises disclosed in this filing.

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^*

Nelson Jonathan Michael

(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)

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

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	16,554	I	By 401(k)
Common Stock								7,000	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 transactions did AVBC insider Jonathan M. Nelson report on 08/26/2025?

The Form 4 shows a purchase of 6,631 shares at $15.0806 and a sale of 7,000 shares, both reported for 08/26/2025.

How many Avidia (AVBC) shares does the reporting person own after the transactions?

After the reported transactions the reporting person beneficially owns 16,554 shares indirectly through a 401(k).

What is the reporting person's role at Avidia Bancorp (AVBC)?

The reporting person, Jonathan M. Nelson, is listed as CFO and Treasurer and a director.

When was the Form 4 for AVBC signed and by whom?

The Form 4 was signed via power of attorney by Victor L. Cangelosi on 08/27/2025.

Does the filing report any derivative transactions or option exercises?

No. Table II for derivative securities contains no reported transactions.