Avidia Bancorp grants director 20K shares, options

AVBC director Mark O'Connell received time-vested restricted stock and stock option awards as part of equity compensation.

Rhea-AI Filing Summary

Avidia Bancorp, Inc. (symbol: AVBC) is the issuer of record for a Form 4 filing submitted to the SEC. O'Connell Mark reported acquisition or exercise transactions in this Form 4 filing.

Avidia Bancorp, Inc. (AVBC) director Mark O'Connell reported equity compensation awards on September 16, 2026. He received 20,076 shares of restricted common stock and a grant of 50,190 stock options exercisable at $22.29 per share, both vesting at 20% per year starting September 16, 2027. After the grant, he directly held 50,076 common shares and 50,190 options. No Rule 10b5-1 trading plan is reported for these awards.

Insider Trade Summary

Grant/Award: 70,266 shares

Grant/Award 2 txns

Insider O'Connell Mark

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Options F2	50,190	$0.00	$0.00
Grant/Award	Common Stock F1	20,076	$0.00	$0.00

Holdings After Transaction: Stock Options — 50,190 contracts (Direct); Common Stock — 50,076 shares (Direct)

Footnotes (2)

1. F1. Shares of restricted stock vest at a rate of 20% per year commencing on September 16, 2027.
2. F2. Stock options vest at a rate of 20% per year commencing on September 16, 2027.

Key Figures

Restricted stock granted: 20,076 shares Stock options granted: 50,190 options Option exercise price: $22.29 per share +4 more

7 metrics

Restricted stock granted 20,076 shares Grant of AVBC common stock on September 16, 2026

Stock options granted 50,190 options Equity award to director on September 16, 2026

Option exercise price $22.29 per share Exercise price for 50,190 AVBC stock options

Option expiration date September 16, 2036 Expiration for granted stock options

Vesting rate 20% per year Applies to both restricted stock and stock options, starting September 16, 2027

Common shares held after grant 50,076 shares Mark O'Connell’s direct AVBC common stock holdings post-transaction

Options held after grant 50,190 options Total AVBC stock options directly held after the award

Key Terms

restricted stock, stock options, exercise price, vesting

4 terms

restricted stock financial

"Shares of restricted stock vest at a rate of 20% per year"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

stock options financial

"Stock options vest at a rate of 20% per year"

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

exercise price financial

"conversion_or_exercise_price": "22.2900""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vesting financial

"vest at a rate of 20% per year commencing on September 16, 2027"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What did AVBC director Mark O'Connell report on this Form 4?

He reported equity compensation awards from Avidia Bancorp, Inc., consisting of 20,076 restricted common shares and 50,190 stock options granted on September 16, 2026, along with his resulting direct holdings.

How many AVBC restricted shares did Mark O'Connell receive and how do they vest?

He received 20,076 shares of restricted stock. According to the disclosure, these shares vest at a rate of 20% per year, commencing on September 16, 2027, meaning the award is time-based and vests over multiple years.

What are the key terms of Mark O'Connell’s AVBC stock options?

He was granted 50,190 stock options with an exercise price of $22.29 per share. The options vest at 20% per year starting on September 16, 2027 and have an expiration date of September 16, 2036.

What are Mark O'Connell’s AVBC common stock holdings after these awards?

Following the grant of restricted stock, Mark O'Connell directly holds 50,076 shares of AVBC common stock. The filing states this as his total direct common share ownership after the September 16, 2026 transaction.

Does this AVBC Form 4 indicate trades under a Rule 10b5-1 plan?

No. The document-level checkbox indicates no Rule 10b5-1 trading plan for the reported transactions. The awards are reported as grants/acquisitions of equity compensation rather than open-market purchases or sales.

Are the AVBC stock awards to Mark O'Connell immediately exercisable or free of restrictions?

No. Both the restricted stock and stock options vest at 20% per year beginning on September 16, 2027. Until vested, the restricted shares remain subject to restrictions and the options are not fully vested.

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

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Available on EDGAR 09/17/2026 - 03:27 PM EDT Accepted by SEC EDGAR 09/17/2026 - 03:27 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^*

O'Connell Mark

(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)
09/16/2026

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	09/16/2026		A		20,076(1)	A	$0	50,076	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
Stock Options	$22.29	09/16/2026		A		50,190(2)		09/16/2027	09/16/2036	Common Stock	50,190(2)	$0	50,190(2)	D

Explanation of Responses:

1. Shares of restricted stock vest at a rate of 20% per year commencing on September 16, 2027.

2. Stock options vest at a rate of 20% per year commencing on September 16, 2027.

	/s/ Victor L. Cangelosi, pursuant to power of attorney	09/17/2026
	** 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)