Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Avidia Bancorp, Inc.

CIK 0002058758AVBC· quarter ending 2026-06-30

Shares outstanding

19,970,306

as of 2026-08-13 · 10-Q cover page, filed 2026-08-13

Held by 13F filers

7,195,848

36.0% of shares outstanding

Holders

+15 vs 2026-03-31 · 27 new, 12 exited

Value

$151.0M

shares +10.0% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-13)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	AVBC · NYSE	19,970,306	7,195,848	36.0%	81	05369T100

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	05369T100	COMMON STOCK	81	7,195,848	19,970,306	36.0%	$151.0M	—	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (81 of 81 · 05369T100)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	T. Rowe Price Investment Management, Inc.	1,172,953	5.87%	$24.6M	-24,805 (-2.1%)
2	BlackRock, Inc.	1,151,670	5.77%	$24.2M	+875,156 (+316.5%)
3	VANGUARD CAPITAL MANAGEMENT LLC	800,793	4.01%	$16.8M	-21,183 (-2.6%)
4	FJ Capital Management LLC	497,258	2.49%	$10.4M	—
5	GEODE CAPITAL MANAGEMENT, LLC	442,624	2.22%	$9.3M	+222,719 (+101.3%)
6	STATE STREET CORP	251,299	1.26%	$5.3M	+188,377 (+299.4%)
7	TWO SIGMA INVESTMENTS, LP	247,210	1.24%	$5.2M	+36,088 (+17.1%)
8	HENNESSY ADVISORS INC	157,000	0.79%	$3.3M	+2,000 (+1.3%)
9	MORGAN STANLEY	149,088	0.75%	$3.1M	+25,163 (+20.3%)
10	MARSHALL WACE, LLP	146,200	0.73%	$3.1M	+45,218 (+44.8%)
11	NORTHERN TRUST CORP	143,822	0.72%	$3.0M	+103,632 (+257.9%)
12	VANGUARD FIDUCIARY TRUST CO	124,642	0.62%	$2.6M	+8,344 (+7.2%)
13	VANGUARD PORTFOLIO MANAGEMENT LLC	123,123	0.62%	$2.6M	NEW
14	RENAISSANCE TECHNOLOGIES LLC	116,812	0.58%	$2.5M	+73,512 (+169.8%)
15	GOLDMAN SACHS GROUP INC	109,562	0.55%	$2.3M	+11,563 (+11.8%)
16	Ancora Advisors LLC	102,550	0.51%	$2.2M	+27,160 (+36.0%)
17	Arbiter Partners Capital Management LLC	98,400	0.49%	$2.1M	+65,600 (+200.0%)
18	COMMONWEALTH EQUITY SERVICES, LLC	92,488	0.46%	$1.9M	+16,307 (+21.4%)
19	WHITE PINE CAPITAL LLC	86,705	0.43%	$1.8M	-77,866 (-47.3%)
20	FRANKLIN RESOURCES INC	68,497	0.34%	$1.4M	-7,801 (-10.2%)
21	Russell Investments Group, Ltd.	66,077	0.33%	$1.4M	-10,820 (-14.1%)
22	Polaris Capital Management, LLC	62,600	0.31%	$1.3M	+22,600 (+56.5%)
23	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	60,567	0.30%	$1.3M	+50,567 (+505.7%)
24	IRONWOOD INVESTMENT MANAGEMENT LLC	53,642	0.27%	$1.1M	+7 (+0.0%)
25	BNP PARIBAS FINANCIAL MARKETS	47,237	0.24%	$992K	+6,948 (+17.2%)
26	Bank of New York Mellon Corp	45,933	0.23%	$964K	NEW
27	Trexquant Investment LP	45,006	0.23%	$945K	+18,957 (+72.8%)
28	PANAGORA ASSET MANAGEMENT INC	44,696	0.22%	$938K	NEW
29	JPMORGAN CHASE & CO	37,847	0.19%	$800K	-20,455 (-35.1%)
30	Nuveen, LLC	36,191	0.18%	$760K	NEW
31	GSA CAPITAL PARTNERS LLP	35,205	0.18%	$739K	NEW
32	STILWELL VALUE LLC	35,000	0.18%	$735K	-5,000 (-12.5%)
33	Voleon Capital Management LP	34,782	0.17%	$730K	+8,914 (+34.5%)
34	Freestone Capital Holdings, LLC	34,756	0.17%	$730K	+2 (+0.0%)
35	GREAT OAK CAPITAL PARTNERS, LLC	34,157	0.17%	$694K	+2 (+0.0%)
36	BANK OF AMERICA CORP /DE/	33,494	0.17%	$703K	+6,982 (+26.3%)
37	Oppenheimer & Close, LLC	26,502	0.13%	$556K	—
38	MILLENNIUM MANAGEMENT LLC	22,689	0.11%	$476K	-300,341 (-93.0%)
39	WELLS FARGO & COMPANY/MN	22,314	0.11%	$468K	+16,091 (+258.6%)
40	XTX Topco Ltd	21,302	0.11%	$447K	+8,874 (+71.4%)
41	UBS Group AG	19,787	0.10%	$415K	-509 (-2.5%)
42	CITADEL ADVISORS LLC	17,940	0.09%	$377K	+2,560 (+16.6%)
43	DEUTSCHE BANK AG\	17,880	0.09%	$375K	NEW
44	RHUMBLINE ADVISERS	16,991	0.09%	$357K	NEW
45	Engineers Gate Manager LP	15,420	0.08%	$324K	+2,813 (+22.3%)
46	PRICE T ROWE ASSOCIATES INC /MD/	15,246	0.08%	$321K	NEW
47	LYNCH & ASSOCIATES/IN	15,206	0.08%	$319K	—
48	OCCUDO QUANTITATIVE STRATEGIES LP	14,911	0.07%	$313K	NEW
49	AMERICAN CENTURY COMPANIES INC	13,432	0.07%	$282K	NEW
50	JANE STREET GROUP, LLC	13,160	0.07%	$276K	-29,553 (-69.2%)
51	ROCKLAND TRUST CO	12,646	0.06%	$265K	—
52	CITIGROUP INC	12,106	0.06%	$254K	-2,399 (-16.5%)
53	Farther Finance Advisors, LLC	12,000	0.06%	$252K	—
54	SEI INVESTMENTS CO	11,974	0.06%	$251K	NEW
55	Schonfeld Strategic Advisors LLC	11,462	0.06%	$241K	-36,077 (-75.9%)
56	MetLife Investment Management, LLC	11,173	0.06%	$235K	NEW
57	Invesco Ltd.	10,837	0.05%	$227K	NEW
58	Intellus Advisors LLC	10,000	0.05%	$210K	—
59	MACKENZIE FINANCIAL CORP	9,672	0.05%	$203K	NEW
60	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	8,401	0.04%	$176K	NEW
61	Vanguard Global Advisers, LLC	6,517	0.03%	$137K	—
62	NEW YORK STATE COMMON RETIREMENT FUND	6,400	0.03%	$134K	NEW
63	BARCLAYS PLC	5,773	0.03%	$121K	-5,062 (-46.7%)
64	Police & Firemen's Retirement System of New Jersey	5,404	0.03%	$113K	NEW
65	FLAGSHIP WEALTH ADVISORS, LLC	5,000	0.03%	$105K	NEW
66	STRS OHIO	3,600	0.02%	$76K	NEW
67	Tower Research Capital LLC (TRC)	1,974	0.01%	$41K	NEW
68	Legal & General Group Plc	1,800	0.01%	$38K	NEW
69	Sachetta, LLC	1,797	0.01%	$38K	NEW
70	Ameritas Investment Partners, Inc.	1,663	0.01%	$35K	NEW
71	NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	1,042	0.01%	$22K	NEW
72	ROYAL BANK OF CANADA	801	0.00%	$17K	+444 (+124.4%)
73	Sterling Capital Management LLC	369	0.00%	$8K	NEW
74	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	252	0.00%	$5K	NEW
75	Quarry LP	157	0.00%	$3K	NEW
76	EASTERN BANK	123	0.00%	$3K	—
77	FMR LLC	77	0.00%	$2K	—
78	Physician Wealth Advisors, Inc.	66	0.00%	$1K	—
79	Avion Wealth	34	0.00%	$0	—
80	Rialto Wealth Management, LLC	33	0.00%	$693	—
81	Bare Financial Services, Inc	29	0.00%	$609	—

Exited since 2026-03-31 (12 filers; largest 12 shown)

WELLINGTON MANAGEMENT GROUP LLP	−778,436
ALLIANCEBERNSTEIN L.P.	−134,876
SUSQUEHANNA INTERNATIONAL GROUP, LLP	−58,859
Qube Research & Technologies Ltd	−26,195
DEPRINCE RACE & ZOLLO INC	−20,296
Point72 Asset Management, L.P.	−17,577
MALTESE CAPITAL MANAGEMENT LLC	−13,500
HRT FINANCIAL LP	−13,090
Brevan Howard Capital Management LP	−12,747
Hudson Bay Capital Management LP	−12,002
State of Wyoming	−8,071
Allworth Financial LP	−1,738

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
BlackRock, Inc.	SCHEDULE 13G	2026-07-27	2026-06-30	1,151,670	5.7%
T. Rowe Price Investment Management, Inc.	SCHEDULE 13G	2025-11-14	2025-09-30	1,218,250	6.1%
Avidia Bank Employee Stock Ownership Plan Trust	SCHEDULE 13G	2025-11-13	2025-09-30	1,606,100	8%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.