SEC ownership of Avidia Bancorp, Inc.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002058758.

Comparable stake leader

Avidia Bank Employee Stock Ownership Plan Trust

Disclosed value leader

T. Rowe Price Investment Management, Inc.

Comparable rows

50/50

Latest evidence

11 Aug 2026

Top shareholders Insider holders Latest transactions
Public ticker
AVBC on NYSE
Parsed ownership sources
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
Avidia Bank Employee Stock Ownership Plan Trust
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
Avidia Bank Employee Stock Ownership Plan Trust
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
11 Aug 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0002058758
Issuer location
Hudson, MA

Ownership snapshot

Top shareholders of Avidia Bancorp, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
Avidia Bank Employee Stoc...
Disclosed value leader
T. Rowe Price Investment ...
Comparable rows
50/50
Latest evidence
11 Aug 2026
13D/G 13F 3/4/5 Lead comparable stake: 8% 13D/G row: Avidia Bank Employee Stock Ownership Plan Trust Showing 1-8 of 50 holder rows.

Quick read

Avidia Bank Employee Stock Ownership Plan Trust leads the comparable SEC ownership view at 8%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Avidia Bank Employee Stock Ownership Plan Trust's linked filing trail.
Comparable ownership Top 5
Avidia Bank Employee Stock Owners... 8%
T. Rowe Price Investment Manageme... 6.1%
BlackRock, Inc. 5.7%
Michael Dennis Murphy 0.39%
Robert D. Cozzone 0.34%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Avidia Bank Employee Stock Ownership Plan Trust
13D/G
13D/G
8%
$23,995,134
1,606,100 shares
 $0 30 Sep 2025
T. Rowe Price Investment Management, Inc.
13F 13D/G
Company
13F 13D/G
6.1%
from 13D/G
$24,621,000
1,172,953 shares
 — 30 Jun 2026
BlackRock, Inc.
13F 13D/G
Company
13F 13D/G
5.7%
from 13D/G
$24,173,554
1,151,670 shares
 — 30 Jun 2026
Michael Dennis Murphy
3/4/5
Director, Chairman of the Board
3/4/5
0.39%
$1,538,183
78,080 shares
 +$289,585 28 Apr 2026
Robert D. Cozzone
3/4/5
President & CEO, Director
3/4/5
0.34%
$1,307,539
69,453 shares
 +$649,969 29 May 2026
Joseph F. Grimaldo
3/4/5
Director
3/4/5
0.32%
$1,377,042
64,655 shares
 +$99,786 11 Aug 2026
Bartholomew H. Murphy Jr.
3/4/5
EVP & Chief Operating Off
3/4/5
0.29%
$1,132,080
59,440 shares
 +$65,553 18 Mar 2026
Gilles Michael O
3/4/5
Director
3/4/5
0.26%
$1,004,443
52,396 shares
 +$154,703 15 May 2026
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to buying over the last 12 months. Net value: +$2,252,032.

Buys
$2,252,032
Insiders: 12
Sells
$0
Insiders: 0
Net
+$2,252,032
Shares: +130,319
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 130,319 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 14,267 0 $297,457 $0 +$297,457
3-6 34,259 0 $675,466 $0 +$675,466
6-9 26,843 0 $437,131 $0 +$437,131
9-12 54,950 0 $841,978 $0 +$841,978

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 20 reporting-owner rows connected to Avidia Bancorp, Inc.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
20
Largest Forms 3/4/5 holder
Michael Dennis Murphy
Net 12M change
+$2,252,031
Latest report
11 Aug 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Michael Dennis Murphy Director, Chairman of the Board $1,538,183 +$289,585 +23% Mixed 28 Apr 2026
Joseph F. Grimaldo Director $1,377,042 +$99,786 +7.8% Mixed 11 Aug 2026
Robert D. Cozzone President & CEO, Director $1,307,539 +$649,969 +99% Mixed 29 May 2026
Bartholomew H. Murphy Jr. EVP & Chief Operating Off $1,132,080 +$65,553 +6.1% Mixed 18 Mar 2026
James N. Ball Director $1,030,000 +$183,656 +22% Filing P/S 27 Apr 2026
Gilles Michael O Director $1,004,443 +$154,703 +18% Mixed 15 May 2026
Barry H. Jensen EVP and Chief Admin Officer $816,485 +$405,377 +99% Mixed 18 May 2026
Jonathan Michael Nelson CFO and Treasurer $715,074 +$170,196 +31% Mixed 03 Jun 2026
Nicolas Karmelek EVP and CRO $599,191 +$45,989 +8.3% Mixed 28 Apr 2026
Thomas Doane EVP- Human Resources $394,525 +$43,166 +12% Mixed 28 Apr 2026
Saul Kennedy O Director $217,783 +$127,733 +142% Filing P/S 11 Aug 2026
Michael R. Girard Director $18,331 +$16,318 +811% Filing P/S 12 Mar 2026
Paul Blazar Director Mixed 31 Jul 2025
Mark O'Connell Director Mixed 31 Jul 2025
Carol Gallagher V Director Mixed 31 Jul 2025
Vanessa Candela Director Mixed 31 Jul 2025
Jeffrey B. Leland Director Mixed 31 Jul 2025
Robert W. Conery EVP & Chief Operations Off Mixed 06 Aug 2025
Michael Neil Flanigan Director Mixed 08 Aug 2025
Donald J. Frost III EVP- Consumer Banking Mixed 31 Jul 2025

Recent insider transactions for Avidia Bancorp, Inc.

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Saul Kennedy O AVBC Common Stock Purchase 142.2% $127,733 $21.65 5,900 10,050 11 Aug 2026 Direct
Joseph F. Grimaldo AVBC Common Stock Purchase 11.6% $99,786 $21.44 4,655 44,655 11 Aug 2026 By Trust
Jonathan Michael Nelson AVBC Common Stock Purchase 7.9% $20,128 $18.90 1,065 14,545 03 Jun 2026 Direct
Robert D. Cozzone AVBC Common Stock Purchase 3.26% $40,006 $18.80 2,128 67,357 29 May 2026 By 401(k)
Nicolas Karmelek AVBC Common Stock Purchase 0.25% $363 $19.08 19 7,727 27 May 2026 Direct
Barry H. Jensen AVBC Common Stock Purchase 1.2% $9,440 $18.88 500 42,000 18 May 2026 Direct
Gilles Michael O AVBC Common Stock Purchase 25% $18,916 $18.92 1,000 5,000 15 May 2026 By Spouse
Gilles Michael O AVBC Common Stock Purchase 5.26% $19,170 $19.17 1,000 20,000 15 May 2026 By IRA
Gilles Michael O AVBC Common Stock Purchase 3.98% $19,120 $19.12 1,000 26,096 15 May 2026 Direct
Gilles Michael O AVBC Common Stock Purchase 4.15% $19,500 $19.50 1,000 25,096 14 May 2026 Direct
Barry H. Jensen AVBC Common Stock Purchase 1.22% $9,630 $19.26 500 41,500 14 May 2026 Direct
Gilles Michael O AVBC Common Stock Purchase 33.3% $19,496 $19.50 1,000 4,000 13 May 2026 By Spouse
Gilles Michael O AVBC Common Stock Purchase 18.8% $58,500 $19.50 3,000 19,000 13 May 2026 By IRA
Robert D. Cozzone AVBC Common Stock Purchase 3.2% $39,990 $19.77 2,023 65,229 13 May 2026 By 401(k)
Barry H. Jensen AVBC Common Stock Purchase 2.5% $20,190 $20.19 1,000 41,000 08 May 2026 Direct
Barry H. Jensen AVBC Common Stock Purchase 2.56% $20,300 $20.30 1,000 40,000 29 Apr 2026 Direct
Nicolas Karmelek AVBC Common Stock Purchase 18.6% $25,099 $20.76 1,209 7,694 28 Apr 2026 Direct
Michael Dennis Murphy AVBC Common Stock Purchase $38,739 $20.94 1,850 1,850 28 Apr 2026 By Spouse
Thomas Doane AVBC Common Stock Purchase 13.2% $43,166 $21.16 2,040 17,495 28 Apr 2026 By 401(k)
James N. Ball AVBC Common Stock Purchase 11.1% $103,000 $20.60 5,000 50,000 27 Apr 2026 By IRA
Bartholomew H. Murphy Jr. AVBC Common Stock Purchase 6.98% $28,725 $19.15 1,500 23,000 18 Mar 2026 Direct
Bartholomew H. Murphy Jr. AVBC Common Stock Purchase 4.4% $8,193 $18.62 440 10,440 12 Mar 2026 By Spouse's IRA
Michael R. Girard AVBC Common Stock Purchase 85.7% $8,461 $18.80 450 975 12 Mar 2026 By Roth IRA
Barry H. Jensen AVBC Common Stock Purchase 2.63% $18,690 $18.69 1,000 39,000 12 Mar 2026 Direct
Bartholomew H. Murphy Jr. AVBC Common Stock Purchase 7.5% $28,635 $19.09 1,500 21,500 09 Mar 2026 Direct
Jonathan Michael Nelson AVBC Common Stock Purchase 13% $50,004 $19.39 2,579 22,378 09 Mar 2026 By 401(k)
Robert D. Cozzone AVBC Common Stock Purchase 1.71% $19,993 $18.79 1,064 63,206 02 Mar 2026 By 401(k)
Nicolas Karmelek AVBC Common Stock Purchase 20.2% $20,263 $18.59 1,090 6,485 02 Mar 2026 Direct
Nicolas Karmelek AVBC Common Stock Purchase 0.18% $265 $18.92 14 7,708 25 Feb 2026 Direct
Barry H. Jensen AVBC Common Stock Purchase 5.56% $37,420 $18.71 2,000 38,000 23 Feb 2026 Direct
Robert D. Cozzone AVBC Common Stock Purchase 4.34% $49,994 $19.36 2,582 62,142 11 Feb 2026 By 401(k)
Barry H. Jensen AVBC Common Stock Purchase 2.86% $18,950 $18.95 1,000 36,000 11 Feb 2026 Direct
Barry H. Jensen AVBC Common Stock Purchase 7.69% $42,674 $17.07 2,500 35,000 17 Dec 2025 Direct
Michael Dennis Murphy AVBC Common Stock Purchase 623% $99,671 $16.00 6,230 7,230 01 Dec 2025 By Spouse's IRA
James N. Ball AVBC Common Stock Purchase 12.5% $80,656 $16.13 5,000 45,000 01 Dec 2025 By IRA
Jonathan Michael Nelson AVBC Common Stock Purchase 19.6% $50,005 $15.41 3,245 19,799 24 Nov 2025 By 401(k)
Robert D. Cozzone AVBC Common Stock Purchase 5.79% $50,004 $15.33 3,261 59,560 21 Nov 2025 By 401(k)
Michael R. Girard AVBC Common Stock Purchase $7,857 $14.96 525 525 18 Nov 2025 By Roth IRA
Barry H. Jensen AVBC Common Stock Purchase 8.33% $37,321 $14.93 2,500 32,500 18 Nov 2025 Direct
Barry H. Jensen AVBC Common Stock Purchase 20% $76,224 $15.24 5,000 30,000 13 Nov 2025 Direct
Robert D. Cozzone AVBC Common Stock Purchase 6.11% $50,003 $15.43 3,240 56,299 10 Nov 2025 By 401(k)
Michael Dennis Murphy AVBC Common Stock Purchase 5.38% $37,762 $15.10 2,500 49,000 07 Nov 2025 Direct
Michael Dennis Murphy AVBC Common Stock Purchase $15,100 $15.10 1,000 1,000 06 Nov 2025 By Spouse's IRA
Michael Dennis Murphy AVBC Common Stock Purchase 16.2% $98,312 $15.12 6,500 46,500 05 Nov 2025 Direct
Robert D. Cozzone AVBC Common Stock Purchase 6.58% $50,006 $15.26 3,277 53,059 05 Nov 2025 By 401(k)
Robert D. Cozzone AVBC Common Stock Purchase 7.12% $49,996 $15.10 3,310 49,782 03 Nov 2025 By 401(k)
Barry H. Jensen AVBC Common Stock Purchase 11.1% $37,413 $14.97 2,500 25,000 31 Oct 2025 Direct
Robert D. Cozzone AVBC Common Stock Purchase 7.71% $49,987 $15.03 3,325 46,472 30 Oct 2025 By 401(k)
Barry H. Jensen AVBC Common Stock Purchase 12.5% $37,500 $15.00 2,500 22,500 30 Oct 2025 Direct
Robert D. Cozzone AVBC Common Stock Purchase 7.82% $49,987 $15.97 3,130 43,147 18 Sep 2025 By 401(k)
* marks a reported price that did not pass the local price check.
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .