WSBK · Winchester Bancorp, Inc./MD/ · Holdings
Market Cap
$118.42M
Shares
9.30M
Volume · Oct 5
7342
Avg daily vol (3M)
7148
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
Holders: 21
Total Value: $9,974,843
Total Shares: 759,121
Institutional Ownership Trend
5 quarters
Holder Concentration
Across 21 13F filers · Δ vs Mar 31, 2026Top Holder
24.5%
−0.3 pts
Top 5
71.4%
−1.2 pts
Top 10
88.3%
−0.7 pts
HHI
1,422
Broadly held−44
Quarterly Activity
vs Mar 31, 2026
New
5
Increased
4
Decreased
3
Sold Out
3
Unchanged
9
Holder count:
+2
Institutional value:
+4.6%
Shares held:
+1.1%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +15,117 | 29,037 | |
| Mid EASTERN BANK | +1,500 | 4,000 | |
| Large RENAISSANCE TECHNOLOGIES LLC | +400 | 31,400 | |
| Mega VANGUARD FIDUCIARY TRUST CO | +146 | 22,708 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | −2,572 | 178,941 | |
| Mid Tower Research Capital LLC (TRC) | −137 | 157 | |
| Mega UBS Group AG | −111 | 18 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega BlackRock, Inc. | 14,202 | $186,613 | |
| Small RFG - Bristol Wealth Advisors, LLC | 10,158 | $133,476 | |
| Small Sachetta, LLC | 8,000 | $105,120 | |
| Mega ROYAL BANK OF CANADA | 2,000 | $26,280 | |
| Large OSAIC HOLDINGS, INC. | 16 | $210 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Small M3F, Inc. | 24,586 | $312,242 | |
| Mega MILLENNIUM MANAGEMENT LLC | 11,543 | $146,596 | |
| Mega MORGAN STANLEY | 4,000 | $50,800 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mid MANGROVE PARTNERS IM, LLC | $2,446,681 | 24.53% | 186,201 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $2,351,284 | 23.57% | 178,941 | Shares | 2026-08-13 | |
| Small Northstar Financial Companies, Inc. | $919,800 | 9.22% | 70,000 | Shares | 2026-08-06 | |
| Large Integrated Wealth Concepts LLC | $748,980 | 7.51% | 57,000 | Shares | 2026-09-09 | |
| Small Oppenheimer & Close, LLC | $657,000 | 6.59% | 50,000 | Shares | 2026-08-12 | |
| Large RENAISSANCE TECHNOLOGIES LLC | $412,596 | 4.14% | 31,400 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $381,545 | 3.83% | 29,037 | Shares | 2026-08-12 | |
| Mega ALLIANCEBERNSTEIN L.P. | $323,979 | 3.25% | 24,656 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $298,383 | 2.99% | 22,708 | Shares | 2026-08-13 | |
| Mega RAYMOND JAMES FINANCIAL INC | $262,800 | 2.63% | 20,000 | Shares | 2026-08-14 | |
| Large Steward Partners Investment Advisory, LLC | $251,328 | 2.52% | 19,127 | Shares | 2026-08-13 | |
| Small EagleClaw Capital Managment, LLC | $210,240 | 2.11% | 16,000 | Shares | 2026-08-10 | |
| Mega LPL Financial LLC | $203,670 | 2.04% | 15,500 | Shares | 2026-08-07 | |
| Mega BlackRock, Inc. | $186,613 | 1.87% | 14,202 | Shares | 2026-08-07 | |
| Small RFG - Bristol Wealth Advisors, LLC | $133,476 | 1.34% | 10,158 | Shares | 2026-07-27 | |
| Small Sachetta, LLC | $105,120 | 1.05% | 8,000 | Shares | 2026-07-15 | |
| Mid EASTERN BANK Bank | $52,560 | 0.53% | 4,000 | Shares | 2026-07-01 | |
| Mega ROYAL BANK OF CANADA Bank | $26,280 | 0.26% | 2,000 | Shares | 2026-08-14 | |
| Mid Tower Research Capital LLC (TRC) | $2,062 | 0.02% | 157 | Shares | 2026-08-11 | |
| Mega UBS Group AG | $236 | 0.00% | 18 | Shares | 2026-08-13 | |
| Large OSAIC HOLDINGS, INC. | $210 | 0.00% | 16 | Shares | 2026-08-14 |