AVBC insider purchase: CFO and Treasurer adds 3,245 AVBC shares

Rhea-AI Filing Summary

Avidia Bancorp, Inc. (AVBC) reported an insider stock purchase by its CFO and Treasurer on a Form 4. On 11/24/2025, the officer bought 3,245 shares of common stock at $15.41 per share in a 401(k) plan, coded as a purchase transaction. After this trade, the officer beneficially owned 19,799 shares indirectly through a 401(k) and 13,480 shares directly. The filing reflects a personal increase in ownership rather than a company-level capital raise.

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

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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^*

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)
11/24/2025

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	11/24/2025		P		3,245	A	$15.41	19,799	I	By 401(k)
Common Stock								13,480	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	11/25/2025
	** 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 insider transaction did Avidia Bancorp (AVBC) disclose in this Form 4?

The filing shows the CFO and Treasurer of Avidia Bancorp, Inc. (AVBC) purchased 3,245 shares of common stock on 11/24/2025 in a 401(k) account.

At what price were the AVBC shares acquired by the CFO?

The CFO acquired 3,245 shares of AVBC common stock at a price of $15.41 per share.

How many Avidia Bancorp (AVBC) shares does the CFO own after this transaction?

Following the reported transaction, the CFO beneficially owned 19,799 shares indirectly through a 401(k) and 13,480 shares directly.

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

The reporting person is an officer of Avidia Bancorp, serving as CFO and Treasurer.

Was this Avidia Bancorp (AVBC) Form 4 filed by a single reporting person?

Yes. The filing indicates it is a Form filed by One Reporting Person, not a joint filing.

What type of security was involved in the AVBC insider transaction?

The transaction involved common stock of Avidia Bancorp, Inc., reported in Table I for non-derivative securities.

Were any derivative securities reported for Avidia Bancorp (AVBC) in this Form 4?

No derivative securities are listed with transactions in Table II; the detailed activity is only for common stock in Table I.