Winchester Bancorp Inc
$13.00+0.2%
+$967.6K
Net Activity
+4.48% total shares
Institutions Holding
21
Popularity Rank
#8281
Avg Weight
0.06%
Total Value
$10.3M
Market Cap
$120.2M
21 institutions currently hold WSBK, with 10 net buyers and 6 net sellers this quarter.
Institutional Moves (Q2 2026)
Majority Increased
Based on recent trading activity
Net Selling Institutions
6
Net Buying Institutions
10
Top 5 by Value
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Across its top 20 institutional holders, WSBK's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 7/100, avg. turnover score 30/100).
WSBK ranks #8281 out of 37501 tracked stocks by institutional interest, inside the more closely watched half of our coverage.
21 institutions disclose a position in WSBK, but none treat it as a major bet — even Northstar Financial Companies, Inc., its most concentrated holder, allocates just 0.6% of its own portfolio to it.
Mangrove Partners Im, LLC has added to its WSBK position for two straight quarters, increasing it by $500.9K to reach $2.4M today.
WSBK reported a net loss of $874.0K in its latest fiscal year.
+$1.0M
Total Buy Value
$546.5K
Total Sell Value
10
Net Buyers
6
Net Sellers
WSBK
Q2 2026
Top 5 Institutional Movers
+$353.6K
-$312.0K
+$204.8K
+$186.6K
-$146.6K
WSBK does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.
13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
No Form 144 planned sale filings in the last 90 days
No Schedule 13D/13G filings for this ticker
1
Filings (14d)
Winchester Bancorp, the holding company for Winchester Savings Bank, said on July 30 it released a press release with financial results for the fiscal year ended June 30, 2026. The 8-K attaches that press release as Exhibit 99.1, but the excerpt provided doesn't include the actual numbers. The filing also lists Items 5.03 and 9.01, but the excerpt doesn't explain what those cover.
View Full Filing (SEC EDGAR)97269D103
The most-added stocks by 13F institutions this quarter
Institutions Holding
6,242
Total reported value
$2.2T
3229 13F institutions increased their position this quarter
Institutions Holding
5,990
Total reported value
$3.6T
3033 13F institutions increased their position this quarter
Institutions Holding
6,153
Total reported value
$1.8T
2971 13F institutions increased their position this quarter
The most widely held stocks tracked across all 13F institutions
Institutions Holding
5,250
Total reported value
$1.3T
Held by 5250 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,144
Total reported value
$670.7B
Held by 5144 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,074
Total reported value
$1.1T
Held by 5074 institutions — one of the most-tracked stocks on AlphaSMO
Access WSBK's institutional ownership data programmatically:
REST API
curl https://alphasmo.com/api/v1/market/stock/WSBKCLI
npx alphasmo stocks get WSBK