Avidia Bancorp director sells 5,000 common shares

Restricted stock and stock options each vest at a rate of 20% per year commencing September 16, 2027.

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Rhea-AI Filing Summary

Avidia Bancorp, Inc. (AVBC) director Micheal Neil Flanigan reported three sales on September 18, 2026, totaling 5,000 common shares held indirectly by an LLP. The sales were 1,500 shares at $22.3501, 1,300 at $22.3319, and 2,200 at $22.3326 per share; no Rule 10b5-1 plan is reported. Post-transaction positions listed on September 18, 2026, include 20,076 directly held common shares, 24,500 shares by IRA, 13,334 by LLC, and 1,000 by brother. The report also lists directly held options covering 50,190 common shares, with a $22.2900 exercise price and a September 16, 2036 expiration.

Insider Trade Summary

Net Seller: 5,000 shares

Net Sell 8 txns

Insider Flanigan Micheal Neil

Role Director

Sold 5,000 shs ($112K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,500	$22.3501	$34K
Sale	Common Stock	1,300	$22.3319	$29K
Sale	Common Stock	2,200	$22.3326	$49K
holding	Stock Options ^F2	--	--	--
holding	Common Stock ^F1	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 0 shares (Indirect, By LLP); Stock Options — 50,190 contracts (Direct); Common Stock — 20,076 shares (Direct); Common Stock — 24,500 shares (Indirect, By IRA); Common Stock — 13,334 shares (Indirect, By LLC); Common Stock — 1,000 shares (Indirect, By Brother)

Footnotes (2)

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

Key Figures

Indirect common shares sold: 1,500 shares at $22.3501 per share Indirect common shares sold: 1,300 shares at $22.3319 per share Indirect common shares sold: 2,200 shares at $22.3326 per share +5 more

8 metrics

Indirect common shares sold 1,500 shares at $22.3501 per share Sale reported for September 18, 2026

Indirect common shares sold 1,300 shares at $22.3319 per share Sale reported for September 18, 2026

Indirect common shares sold 2,200 shares at $22.3326 per share Sale reported for September 18, 2026

Direct common shares 20,076 shares Post-transaction position listed September 18, 2026

Common shares held by IRA 24,500 shares Position listed September 18, 2026

Common shares held by LLC 13,334 shares Position listed September 18, 2026

Common shares held by brother 1,000 shares Position listed September 18, 2026

Direct stock options 50,190 underlying shares; $22.2900 exercise price Options expire September 16, 2036

Key Terms

restricted stock, stock options, vesting

3 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.

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.

How many AVBC shares did director Micheal Neil Flanigan sell?

On September 18, 2026, sales reported as held indirectly by an LLP were 1,500 shares at $22.3501 per share, 1,300 at $22.3319, and 2,200 at $22.3326, totaling 5,000 shares. No Rule 10b5-1 plan is reported.

How do AVBC director Micheal Neil Flanigan's restricted stock and options vest?

The reported restricted stock and stock options each vest at a rate of 20% per year commencing September 16, 2027.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/09/2026 - 10:52 AM Accepted by SEC EDGAR 10/09/2026 - 10:51 AM

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^*

Flanigan Micheal Neil

(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)
09/18/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	09/18/2026		S		1,500	D	$22.3501	3,500	I	By LLP
Common Stock	09/18/2026		S		1,300	D	$22.3319	2,200	I	By LLP
Common Stock	09/18/2026		S		2,200	D	$22.3326	0	I	By LLP
Common Stock								20,076⁽¹⁾	D
Common Stock								24,500	I	By IRA
Common Stock								13,334	I	By LLC
Common Stock								1,000	I	By Brother

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Options	$22.29							09/16/2027	09/16/2036	Common Stock	50,190⁽²⁾		50,190⁽²⁾	D

Explanation of Responses:

1. Includes 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/ Michael Neil Flanigan	10/08/2026
	** 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)

Source: View Original Filing on SEC EDGAR