Avidia Bancorp CFO buys 4,500 shares at $22.19

Avidia Bancorp, Inc. (AVBC) reports that its CFO and Treasurer, Jonathan Michael Nelson, purchased 4,500 shares of common stock on September 3, 2026 in an open-market or private transaction at $22.19 per share.

Rhea-AI Filing Summary

Avidia Bancorp, Inc. (AVBC) reports that its CFO and Treasurer, Jonathan Michael Nelson, purchased 4,500 shares of common stock on September 3, 2026 in an open-market or private transaction at $22.19 per share. Following this purchase, he holds 19,045 shares directly and 22,378 shares indirectly through a 401(k). No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Buyer: 4,500 shares

Net Buy 2 txns

Insider Nelson Jonathan Michael

Role CFO and Treasurer

Bought 4,500 shs ($100K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	4,500	$22.19	$100K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 19,045 shares (Direct); Common Stock — 22,378 shares (Indirect, By 401(k))

Key Figures

Shares purchased: 4,500 shares Purchase price per share: $22.19 per share Direct holdings after transaction: 19,045 shares +2 more

5 metrics

Shares purchased 4,500 shares Common Stock purchased on September 3, 2026

Purchase price per share $22.19 per share Price for 4,500 shares bought on September 3, 2026

Direct holdings after transaction 19,045 shares Directly owned common stock following the September 3, 2026 purchase

Indirect holdings via 401(k) 22,378 shares Indirect ownership reported as held by 401(k) after the transaction

Net buy shares 4,500 shares Net change from reported buy/sell transactions in this Form 4

Key Terms

Rule 10b5-1, open market or private transaction, indirect ownership, 401(k)

4 terms

Rule 10b5-1 regulatory

"No Rule 10b5-1 trading plan is reported"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

open market or private transaction financial

"Purchase in open market or private transaction at $22.19 per share"

indirect ownership financial

"Indirect ownership of 22,378 shares held by 401(k)"

401(k) financial

"22,378 shares indirectly through a 401(k)"

A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.

FAQ

What insider transaction did AVBC report for its CFO?

Avidia Bancorp (AVBC) reported that CFO and Treasurer Jonathan Michael Nelson purchased 4,500 shares of common stock on September 3, 2026 in an open-market or private transaction at $22.19 per share.

How many AVBC shares does the CFO own after this transaction?

After the reported transaction, CFO Jonathan Michael Nelson holds 19,045 AVBC shares directly and 22,378 shares indirectly through a 401(k), according to the filing.

Was the AVBC CFO’s share purchase under a Rule 10b5-1 plan?

No. The filing indicates that no Rule 10b5-1 trading plan is reported for the September 3, 2026 purchase of 4,500 AVBC shares by the CFO.

What price did the AVBC CFO pay for the purchased shares?

For the 4,500 AVBC shares acquired on September 3, 2026, the CFO paid a price of $22.19 per share, as stated in the Form 4 data.

What type of ownership is reported for the CFO’s AVBC shares?

The Form 4 shows direct ownership of 19,045 AVBC shares and indirect ownership of 22,378 shares held “By 401(k)” for CFO Jonathan Michael Nelson.

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Available on EDGAR 09/03/2026 - 05:37 PM Accepted by SEC EDGAR 09/03/2026 - 05:10 PM Learn about SEC filing dates

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 MASSACHUSETTS 01749

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

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

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

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

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	09/03/2026		P		4,500	A	$22.19	19,045	D
Common Stock								22,378	I	By 401(k)

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	09/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)