Avidia Bancorp (NASDAQ: AVBC) CFO buys 2,579 shares in 401(k)

Rhea-AI Filing Summary

Avidia Bancorp, Inc. CFO and Treasurer Jonathan Michael Nelson reported an open-market purchase of 2,579 shares of common stock on March 9 2026 at an average price of $19.3891 per share through a 401(k) plan.

Following this transaction, his indirect holdings via the 401(k) total 22,378 shares of common stock, alongside separate direct ownership of 13,480 shares.

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)
03/09/2026

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	03/09/2026		P		2,579	A	$19.3891	22,378	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	03/10/2026
	** 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 for its CFO?

Avidia Bancorp reported that CFO and Treasurer Jonathan Michael Nelson bought 2,579 shares of common stock in an open-market transaction on March 9 2026 at an average price of $19.3891 per share through a 401(k) plan.

How many Avidia Bancorp (AVBC) shares did the CFO purchase and at what price?

CFO Jonathan Michael Nelson purchased 2,579 Avidia Bancorp common shares at an average price of $19.3891 on March 9 2026. The transaction was executed as an open-market purchase through a 401(k) retirement plan account.

How many Avidia Bancorp (AVBC) shares does the CFO hold after this Form 4 transaction?

After the reported transaction, CFO Jonathan Michael Nelson holds 22,378 Avidia Bancorp common shares indirectly via a 401(k) plan and also has a separate direct ownership position of 13,480 common shares, as disclosed in the Form 4 filing.

Was the Avidia Bancorp (AVBC) CFO’s share transaction a purchase or a sale?

The Form 4 filing shows the Avidia Bancorp CFO engaged in a purchase, not a sale. He executed an open-market buy of 2,579 common shares on March 9 2026, classified under transaction code P, which denotes a purchase.

How is the Avidia Bancorp (AVBC) CFO’s new shareholding structured after the purchase?

Post-transaction, the CFO’s Avidia Bancorp holdings include 22,378 common shares held indirectly through a 401(k) plan and 13,480 common shares held directly. The reported purchase increased the indirect 401(k) position rather than the directly held shares.