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

Rhea-AI Filing Summary

Avidia Bancorp, Inc. executive Bartholomew H. Murphy Jr., EVP & Chief Operating Officer, reported an open-market purchase of Avidia Bancorp common stock. On this Form 4, an account held as his spouse's IRA bought 440 shares at a price of $18.62 per share.

Following this transaction, that spouse's IRA held a total of 10,440 shares of common stock indirectly attributed to Murphy. The filing also lists additional direct and other indirect common stock holdings for Murphy as of the same date.

Insider Trade Summary

Net Buyer: 440 shares ($8,193)

Net Buy 4 txns

Insider Murphy Bartholomew H JR

Role EVP & Chief Operating Off

Bought 440 shs ($8K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	440	$18.62	$8K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 10,440 shares (Indirect, By Spouse's IRA); Common Stock — 21,500 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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^*

Murphy Bartholomew H JR

(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)
	EVP & Chief Operating Off

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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	03/12/2026		P		440	A	$18.62	10,440	I	By Spouse's IRA
Common Stock								21,500	D
Common Stock								20,000	I	By IRA
Common Stock								6,000	I	By Spouse

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	03/13/2026
	** 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.

FAQ

What insider transaction did Avidia Bancorp (AVBC) report on this Form 4?

Avidia Bancorp reported that EVP & Chief Operating Officer Bartholomew H. Murphy Jr. indirectly bought 440 shares of common stock in an open-market transaction at $18.62 per share through his spouse's IRA.

Who is the insider involved in the AVBC Form 4 filing and what is his role?

The insider is Bartholomew H. Murphy Jr., who serves as Executive Vice President and Chief Operating Officer of Avidia Bancorp, Inc. The Form 4 records his indirect ownership activity in the company’s common stock.

How many Avidia Bancorp shares did Murphy’s spouse's IRA hold after the reported purchase?

After the reported open-market purchase, the spouse's IRA associated with Bartholomew H. Murphy Jr. held 10,440 shares of Avidia Bancorp common stock, all reported as indirect beneficial ownership on the Form 4 filing.

Was the AVBC insider transaction a purchase or a sale of stock?

The transaction was a purchase. The Form 4 identifies it as an open-market purchase of 440 shares of Avidia Bancorp common stock at $18.62 per share, reported as indirect ownership through the insider’s spouse's IRA account.

Does the AVBC Form 4 show other holdings for Bartholomew Murphy Jr. besides the spouse's IRA?

Yes. In addition to the spouse's IRA holdings, the Form 4 lists direct holdings and other indirect holdings, including shares held by an IRA and by his spouse, giving a broader picture of his total reported ownership.