Company · Ownership research

Waterstone Financial, Inc. WSBF

CIK 0001569994 · CUSIP 94188P101

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 94188P101 (WSBF), not CUSIP 94188P901 (WSBF), and does not merge CUSIPs.

This page lists the top 20 of 97 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$23.72M 1,717,280 shares	0.00%	-71.18K(-4.00%)Reduced	SEC filing ↗ Aug 12, 2025	▾
02	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$19.81M 1,434,547 shares	0.00%	-47.22K(-3.20%)Reduced	SEC filing ↗ Aug 12, 2025	▾
03	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$15.67M 1,134,936 shares	0.02%	-21.10K(-1.80%)Reduced	SEC filing ↗ Aug 13, 2025	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$13.03M 943,736 shares	0.00%	+7.17K(+0.80%)Added	SEC filing ↗ Aug 11, 2025	▾
05	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$6.06M 438,837 shares	0.14%	+8.20K(+1.90%)Added	SEC filing ↗ Aug 14, 2025	▾
06	STATE STREET CORP CIK 93751 · View history	$6.03M 436,369 shares	0.00%	-14.03K(-3.10%)Reduced	SEC filing ↗ Aug 14, 2025	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$5.62M 406,749 shares	0.00%	+4.11K(+1.00%)Added	SEC filing ↗ Aug 8, 2025	▾
08	CSM Advisors, LLC CIK 1863523 · View history	$2.73M 197,250 shares	0.08%	+197.25KNew	SEC filing ↗ Aug 7, 2025	▾
09	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$2.63M 190,766 shares	0.00%	+44.62K(+30.50%)Added	SEC filing ↗ Aug 13, 2025	▾
10	MORGAN STANLEY CIK 895421 · View history	$2.56M 185,140 shares	0.00%	+2.86K(+1.60%)Added	SEC filing ↗ Aug 14, 2025	▾
11	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$2.21M 159,875 shares	0.00%	+5.53K(+3.60%)Added	SEC filing ↗ Aug 12, 2025	▾
12	NORTHERN TRUST CORP CIK 73124 · View history	$2.13M 153,891 shares	0.00%	-5.80K(-3.60%)Reduced	SEC filing ↗ Aug 13, 2025	▾
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$1.99M 143,992 shares	0.00%	+506(+0.40%)Added	SEC filing ↗ Aug 12, 2025	▾
14	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$1.70M 123,057 shares	0.00%	+17.31K(+16.40%)Added	SEC filing ↗ Aug 14, 2025	▾
15	CITADEL ADVISORS LLC CIK 1423053 · View history	$1.37M 99,322 shares	0.00%	+19.12K(+23.80%)Added	SEC filing ↗ Aug 14, 2025	▾
16	Empowered Funds, LLC CIK 1592828 · View history	$1.27M 91,790 shares	0.01%	+8.20K(+9.80%)Added	SEC filing ↗ Aug 11, 2025	▾
17	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$1.12M 81,381 shares	0.00%	+35.79K(+78.50%)Added	SEC filing ↗ Aug 14, 2025	▾
18	Bank of New York Mellon Corp CIK 1390777 · View history	$1.10M 79,371 shares	0.00%	+1.43K(+1.80%)Added	SEC filing ↗ Aug 5, 2025	▾
19	JPMORGAN CHASE & CO CIK 19617 · View history	$1.02M 73,669 shares	0.00%	-6.90K(-8.60%)Reduced	SEC filing ↗ Aug 12, 2025	▾
20	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$885.98K 64,155 shares	0.00%	+43.62K(+212.30%)Added	SEC filing ↗ Aug 14, 2025	▾

Showing 20 / 97 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

9,316,502

Not deduplicated across managers

Disclosed value

$128.67M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Waterstone Financial, Inc. · Q2 2025

Explore all 97 reporting institutions.

This page includes 20 of 97 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 97 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"94188P101","quarter":"2025Q2","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.