Avidia Bancorp director buys 5,000 AVBC shares

Avidia Bancorp, Inc. director Michael O. Gilles reported open-market purchases of a total of 5,000 shares of common stock.

Rhea-AI Filing Summary

Avidia Bancorp, Inc. director Michael O. Gilles reported open-market purchases of a total of 5,000 shares of common stock. He bought 1,000 shares directly on May 14, 2026 at $19.50 per share, increasing his direct holdings to 25,096 shares. On May 13, 2026, 1,000 shares were purchased at $19.4961 per share and 3,000 shares at $19.50 per share through indirect accounts listed as "By Spouse" and "By IRA." The filing also shows 1,300 indirectly held shares as custodian for a grandchild.

Insider Trade Summary

Net Buyer: 5,000 shares

Net Buy 4 txns

Insider GILLES MICHAEL O

Role Director

Bought 5,000 shs ($97K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	1,000	$19.50	$20K
Purchase	Common Stock	3,000	$19.50	$59K
Purchase	Common Stock	1,000	$19.4961	$19K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 19,000 shares (Indirect, By IRA); Common Stock — 4,000 shares (Indirect, By Spouse); Common Stock — 25,096 shares (Direct); Common Stock — 1,300 shares (Indirect, As custodian for grandchild)

Key Figures

Direct purchase: 1,000 shares at $19.50 Spouse purchase: 1,000 shares at $19.4961 IRA purchase: 3,000 shares at $19.50 +5 more

8 metrics

Direct purchase 1,000 shares at $19.50 Common Stock bought on May 14, 2026, open market

Spouse purchase 1,000 shares at $19.4961 Indirect ownership, Common Stock on May 13, 2026

IRA purchase 3,000 shares at $19.50 Indirect ownership, Common Stock on May 13, 2026

Direct holdings after 25,096 shares Common Stock held directly after May 14, 2026 purchase

Spouse holdings after 4,000 shares Indirect Common Stock held "By Spouse" after May 13, 2026

IRA holdings after 19,000 shares Indirect Common Stock held "By IRA" after May 13, 2026

Custodian holdings 1,300 shares Indirect Common Stock as custodian for grandchild on May 13, 2026

Net shares bought 5,000 shares Net-buy across reported open-market purchases

Key Terms

open-market purchase, indirect ownership, custodian for grandchild, Common Stock

4 terms

open-market purchase financial

"transaction_action: "open-market purchase" for Common Stock transactions"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect ownership financial

"ownership_type: "indirect" with nature_of_ownership "By Spouse" and "By IRA""

custodian for grandchild financial

"nature_of_ownership: "As custodian for grandchild" on indirect holding entry"

Common Stock financial

"security_title: "Common Stock" on all reported transactions"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Avidia Bancorp (AVBC) director Michael O. Gilles report on this Form 4?

He reported buying a total of 5,000 Avidia Bancorp common shares in open-market transactions. These include direct and indirect purchases through a spouse and an IRA, plus updated indirect holdings as custodian for a grandchild.

How many Avidia Bancorp (AVBC) shares did Gilles buy directly and at what price?

He bought 1,000 Avidia Bancorp common shares directly at $19.50 per share. This transaction on May 14, 2026 increased his directly owned position to 25,096 common shares after the purchase.

What indirect Avidia Bancorp (AVBC) share purchases were disclosed on this Form 4?

On May 13, 2026, 1,000 Avidia Bancorp shares were bought at $19.4961 per share "By Spouse" and 3,000 shares at $19.50 per share "By IRA," both reported as indirect ownership positions.

What are Michael O. Gilles’ Avidia Bancorp (AVBC) holdings after these transactions?

After these transactions, he holds 25,096 Avidia Bancorp common shares directly, plus indirect positions including 4,000 shares held "By Spouse," 19,000 shares held "By IRA," and 1,300 shares held as custodian for a grandchild.

Does this Avidia Bancorp (AVBC) Form 4 show any stock sales or derivative exercises?

No, the Form 4 reports only open-market purchases of Avidia Bancorp common stock. It shows no stock sales, no option or warrant exercises, and no derivative security transactions in this filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/15/2026 - 04:05 PM EDT 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^*

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)
05/13/2026

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	05/13/2026		P		3,000	A	$19.5	19,000	I	By IRA
Common Stock	05/13/2026		P		1,000	A	$19.4961	4,000	I	By Spouse
Common Stock	05/14/2026		P		1,000	A	$19.5	25,096	D
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	05/15/2026
	** 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)