Avidia Bancorp (AVBC) CRO boosts stake with 1,220-share open-market buy

Rhea-AI Filing Summary

Avidia Bancorp, Inc. executive Nicolas Karmelek, EVP and Chief Risk Officer, made an open-market purchase of Common Stock. He bought 1,220 shares at $20.76 per share, bringing his direct holdings to 7,705 shares.

The filing also shows indirect holdings of 1,096 shares held by an ESOP and 21,871 shares held in a 401(k) plan. A footnote explains that related plan transactions were not required to be reported under Section 16, indicating these entries primarily update his reported indirect ownership.

Insider Trade Summary

Net Buyer: 1,220 shares ($25,327)

Net Buy 3 txns

Insider Karmelek Nicolas

Role EVP and CRO

Bought 1,220 shs ($25K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	1,220	$20.76	$25K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 7,705 shares (Direct, null); Common Stock — 21,871 shares (Indirect, By 401(k))

Footnotes (1)

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Key Figures

Shares purchased: 1,220 shares Purchase price: $20.76 per share Direct holdings after trade: 7,705 shares +2 more

5 metrics

Shares purchased 1,220 shares Open-market purchase of Common Stock on 2026-04-28

Purchase price $20.76 per share Price paid for the 1,220 purchased shares

Direct holdings after trade 7,705 shares Common Stock directly owned by Nicolas Karmelek after purchase

Indirect ESOP holdings 1,096 shares Common Stock held indirectly by ESOP

Indirect 401(k) holdings 21,871 shares Common Stock held indirectly by 401(k) plan

Key Terms

open-market purchase, ESOP, 401(k), Section 16

4 terms

open-market purchase financial

"He bought 1,220 shares at $20.76 per share in an open-market purchase."

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.

ESOP financial

"The filing also shows indirect holdings of 1,096 shares held by an ESOP."

An Employee Stock Ownership Plan (ESOP) is a program that gives employees ownership shares in their company, often as part of their benefits package. It acts like a company-sponsored savings plan, allowing workers to have a stake in the company's success, which can boost motivation and loyalty. For investors, ESOPs can influence company decisions and stock value, making them an important aspect of corporate ownership and governance.

401(k) financial

"and 21,871 shares held in a 401(k) plan."

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.

Section 16 regulatory

"A footnote explains that related plan transactions were not required to be reported under Section 16."

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

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^*

Karmelek Nicolas

(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)
	EVP and CRO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/28/2026

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	04/28/2026		P		1,220	A	$20.76	7,705	D
Common Stock								21,871(1)	I	By 401(k)
Common Stock								1,096(1)	I	By ESOP

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:

1. Reflects transactions not required to be reported pursuant to Section 16 of the Securities Act of 1934, as amended.

	/s/ Victor L. Cangelosi, pursuant to power of attorney	04/30/2026
	** 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)

FAQ

What insider transaction did Avidia Bancorp (AVBC) report for Nicolas Karmelek?

Avidia Bancorp reported that EVP and CRO Nicolas Karmelek bought 1,220 shares of Common Stock. The open-market purchase was at $20.76 per share and increased his direct ownership to 7,705 shares, according to the Form 4 insider filing.

At what price did Avidia Bancorp EVP Nicolas Karmelek buy AVBC shares?

Nicolas Karmelek purchased 1,220 Avidia Bancorp Common Stock shares at $20.76 per share. This open-market transaction updated his direct holdings to 7,705 shares, as shown in the Form 4 filed for the 2026-04-28 transaction date.

How many Avidia Bancorp (AVBC) shares does Nicolas Karmelek hold after the reported transaction?

After the reported trade, Nicolas Karmelek directly holds 7,705 Avidia Bancorp shares. The filing also lists 1,096 shares held indirectly through an ESOP and 21,871 shares held indirectly via a 401(k) plan, reflecting his overall reported ownership positions.

What indirect Avidia Bancorp (AVBC) holdings are reported for Nicolas Karmelek?

The Form 4 shows 1,096 AVBC shares held indirectly through an ESOP and 21,871 shares held indirectly via a 401(k). A footnote notes that related plan transactions were not required to be reported under Section 16, indicating the entries mainly update ownership totals.

Does the Avidia Bancorp (AVBC) Form 4 mention Section 16 reporting details?

Yes. A footnote states the filing reflects transactions not required to be reported under Section 16 of the Securities Exchange Act of 1934. This clarifies that certain ESOP and 401(k) activities are shown only to update Nicolas Karmelek’s reported indirect ownership positions.