Avidia Bancorp, Inc. (AVBC) director purchases 3,000 common shares

Rhea-AI Filing Summary

Avidia Bancorp, Inc. director GILLES MICHAEL O reported open-market or private purchases of a total of 3,000 shares of common stock on 2026-05-15, in three 1,000-share lots at $19.1205, $19.1700, and $18.9160 per share. Following these trades, holdings stood at 26,096 shares held directly, 20,000 shares held indirectly via an IRA, and 5,000 shares held indirectly by a spouse, plus an additional 1,300 shares reported as held indirectly as custodian for a grandchild. The Rule 10b5-1 trading-plan checkbox was not marked.

Insider Trade Summary

Net Buyer: 3,000 shares

Net Buy 4 txns

Insider GILLES MICHAEL O

Role Director

Bought 3,000 shs ($57K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	1,000	$19.1205	$19K
Purchase	Common Stock	1,000	$19.17	$19K
Purchase	Common Stock	1,000	$18.916	$19K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 26,096 shares (Direct); Common Stock — 20,000 shares (Indirect, By IRA); Common Stock — 5,000 shares (Indirect, By Spouse); Common Stock — 1,300 shares (Indirect, As custodian for grandchild)

Key Figures

Direct purchase shares: 1,000 shares Direct purchase price per share: $19.1205 per share Direct holdings after transaction: 26,096 shares +5 more

8 metrics

Direct purchase shares 1,000 shares Non-derivative common stock purchase on 2026-05-15

Direct purchase price per share $19.1205 per share Price for 1,000-share direct purchase on 2026-05-15

Direct holdings after transaction 26,096 shares Common stock held directly after 2026-05-15 trades

Indirect IRA purchase shares 1,000 shares Non-derivative purchase held indirectly via IRA on 2026-05-15

Indirect IRA holdings after trade 20,000 shares Common stock held indirectly by IRA after 2026-05-15

Indirect spouse holdings after trade 5,000 shares Common stock held indirectly by spouse after 2026-05-15

Custodian holdings 1,300 shares Indirect holdings as custodian for grandchild as of 2026-05-15

Total shares purchased 3,000 shares Aggregate non-derivative purchases on 2026-05-15

Key Terms

Common Stock, indirect, IRA, transaction code, +1 more

5 terms

Common Stock financial

"security_title: "Common Stock", transaction_type: "non-derivative""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

indirect financial

"ownership_type: "indirect", ownership_code: "I""

IRA financial

"nature_of_ownership: "By IRA""

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

transaction code regulatory

"transaction_code_description: "Purchase in open market or private transaction""

acquired_disposed_code regulatory

"acquired_disposed_code: "A""

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/30/2026 - 02:16 PM Accepted by SEC EDGAR 07/30/2026 - 02:07 PM Learn about SEC filing dates

FAQ

What insider transaction did Avidia Bancorp (AVBC) report for director GILLES MICHAEL O?

Avidia Bancorp reported that director GILLES MICHAEL O purchased 3,000 shares of common stock on 2026-05-15. The purchases occurred in three 1,000-share blocks classified as open-market or private transactions, increasing both his direct and indirect share holdings in the company.

At what prices did the AVBC director buy shares in the latest Form 4 filing?

The director bought 1,000 shares at $19.1205, another 1,000 shares at $19.1700, and 1,000 shares at $18.9160 per share. All were non-derivative purchases of Avidia Bancorp common stock on 2026-05-15, reported as open-market or private transactions.

How many Avidia Bancorp (AVBC) shares does the director hold after these transactions?

After the reported trades, the director holds 26,096 AVBC shares directly. Indirectly, he reports 20,000 shares via an IRA, 5,000 shares held by a spouse, and 1,300 shares held as custodian for a grandchild, according to the Form 4 data.

How are the AVBC shares owned by the director categorized in the Form 4?

Holdings are split between direct and indirect ownership. Direct ownership covers 26,096 shares. Indirect ownership includes 20,000 shares via an IRA, 5,000 shares by a spouse, and 1,300 shares as custodian for a grandchild, each separately identified.

Were the recent AVBC share purchases made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked, so these AVBC common stock purchases are not identified as being made under a pre-arranged trading plan. They are reported simply as open-market or private purchase transactions by the director.

What types of securities were involved in the latest Avidia Bancorp (AVBC) insider transaction?

All reported transactions involve Common Stock of Avidia Bancorp, Inc. The Form 4 lists only non-derivative common shares, with no options or other derivative securities reported in the transaction or derivative summaries for 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^*

GILLES MICHAEL O

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/15/2026

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	05/15/2026		P		1,000	A	$19.1205	26,096	D
Common Stock	05/15/2026		P		1,000	A	$19.17	20,000	I	By IRA
Common Stock	05/15/2026		P		1,000	A	$18.916	5,000	I	By Spouse
Common Stock								1,300	I	As custodian for grandchild

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	07/30/2026
	** 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)