Waterstone Financial, Inc.
DE ˙ DB ˙ US94188P1012
15,40 € ↑0,40 (2,67%)
2026-06-05
DEL PRIS
SecurityDE:47Z / Waterstone Financial, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership19,120 shares
Latest Disclosed Value $ 344,745
Rhumbline Advisers reports 7.30% decrease in ownership of 47Z / Waterstone Financial, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 19,120 shares of Waterstone Financial, Inc. (DE:47Z) valued at $300,184 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 20,625 shares of Waterstone Financial, Inc.. This represents a change in shares of -7.30% during the quarter. The current value of the position is $294,448 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 19,120 -1,505 -7.30 345 0.88 0.0003
2026-02-13 2025-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 20,625 -2,755 -11.78 341 -6.32 0.0003
2025-11-06 2025-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 23,380 -3,468 -12.92 365 -1.62 0.0003
2025-08-12 2025-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 26,848 1,676 6.66 371 9.47 0.0003
2025-05-29 2025-03-31 13F/A-1 WATERSTONE FINL INC MD COM COM 94188P101 25,172 -1,480 -5.55 339 -5.59 0.0003
2025-04-08 2025-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 25,172 -1,480 339 0.0003
2025-05-29 2024-12-31 13F/A-1 WATERSTONE FINL INC MD COM COM 94188P101 26,652 -345 -1.28 358 -9.60 0.0003
2025-01-30 2024-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 26,652 -345 358 0.0003
2024-11-12 2024-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 26,997 -1,590 -5.56 397 8.49 0.0004
2024-08-01 2024-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 28,587 -339 -1.17 366 3.69 0.0003
2024-05-09 2024-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 28,926 -3,040 -9.51 352 -22.30 0.0003
2024-02-08 2023-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 31,966 -752 -2.30 454 26.54 0.0005
2023-11-09 2023-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 32,718 -469 -1.41 358 -25.42 0.0004
2023-08-08 2023-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 33,187 4,155 14.31 481 0.0005
2023-05-11 2023-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 29,032 355 1.24 0 -100.00 0.0005
2023-02-14 2022-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 28,677 -549 -1.88 494 4.66 0.0007
2022-11-10 2022-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 29,226 1,590 5.75 472 0.21 0.0007
2022-08-11 2022-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 27,636 1,137 4.29 471 -8.01 0.0007
2022-05-12 2022-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 26,499 -8,913 -25.17 512 -33.85 0.0007
2022-02-10 2021-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 35,412 -1,064 -2.92 774 3.61 0.0009
2021-11-12 2021-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 36,476 1,000 2.82 747 7.17 0.0010
2021-08-05 2021-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 35,476 -3,969 -10.06 697 -13.42 0.0009
2021-05-06 2021-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 39,445 -3,347 -7.82 805 0.00 0.0011
2021-02-10 2020-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 42,792 4,258 11.05 805 34.84 0.0011
2020-11-12 2020-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 38,534 -5,294 -12.08 597 -8.15 0.0009
2020-08-13 2020-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 43,828 -3,273 -6.95 650 -5.11 0.0011
2020-05-06 2020-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 47,101 8,680 22.59 685 -6.29 0.0014
2020-02-05 2019-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 38,421 466 1.23 731 12.12 0.0012
2019-10-23 2019-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 37,955 2,853 8.13 652 8.85 0.0012
2019-08-14 2019-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 35,102 -277 -0.78 599 2.92 0.0011
2019-05-01 2019-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 35,379 -785 -2.17 582 -3.96 0.0011
2019-01-31 2018-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 36,164 11,287 45.37 606 41.92 0.0013
2018-11-07 2018-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 24,877 -125 -0.50 427 0.23 0.0008
2018-08-06 2018-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 25,002 289 1.17 426 -0.47 0.0009
2018-05-02 2018-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 24,713 -1,250 -4.81 428 -3.39 0.0009
2018-02-09 2017-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 25,963 -4,586 -15.01 443 -25.67 0.0009
2017-11-06 2017-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 30,549 235 0.78 596 4.38 0.0013
2017-08-02 2017-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 30,314 -597 -1.93 571 1.24 0.0013
2017-05-02 2017-03-31 13F WATERSTONE FINL INC MD COM COM 94188P101 30,911 1,206 4.06 564 3.11 0.0013
2017-01-27 2016-12-31 13F WATERSTONE FINL INC MD COM COM 94188P101 29,705 -1,214 -3.93 547 4.19 0.0014
2016-11-08 2016-09-30 13F WATERSTONE FINL INC MD COM COM 94188P101 30,919 -3,540 -10.27 525 -0.57 0.0014
2016-08-11 2016-06-30 13F WATERSTONE FINL INC MD COM COM 94188P101 34,459 -6,091 -15.02 528 -4.86 0.0016
2016-05-02 2016-03-31 13F WATERSTONE FINANCIAL COM 94188P101 40,550 3,875 10.57 555 7.35 0.0017
2016-02-03 2015-12-31 13F WATERSTONE FINANCIAL COM 94188P101 36,675 -1,805 -4.69 517 -0.39 0.0017
2015-11-04 2015-09-30 13F WATERSTONE FINANCIAL COM 94188P101 38,480 2,233 6.16 519 8.58 0.0018
2015-08-04 2015-06-30 13F WATERSTONE FINANCIAL COM 94188P101 36,247 -6,210 -14.63 478 -12.29 0.0015
2015-05-12 2015-03-31 13F WATERSTONE FINANCIAL COM 94188P101 42,457 1,800 4.43 545 1.87 0.0016
2015-02-06 2014-12-31 13F WATERSTONE FINANCIAL COM 94188P101 40,657 3,967 10.81 535 26.18 0.0016
2014-11-12 2014-09-30 13F WATERSTONE FINANCIAL COM 94188P101 36,690 0 0.00 424 1.19 0.0013
2014-08-06 2014-06-30 13F WATERSTONE FINANCIAL COM 94188P101 36,690 25,177 218.68 419 227.34 0.0012
2014-02-03 2013-12-31 13F WATERSTONE FINANCIAL COM 94188P101 11,513 -650 -5.34 128 4.07 0.0004
2013-11-05 2013-09-30 13F WATERSTONE FINANCIAL COM 941888109 12,163 -72 -0.59 123 -0.81 0.0004
2013-08-07 2013-06-30 13F WATERSTONE FINANCIAL COM 941888109 12,235 12,235 124 0.0004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.