Winmark Corporation
DE ˙ DB ˙ US9742501029
SecurityDE:GBZ / Winmark Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership35,407 shares
Latest Disclosed Value $ 15,138,264
Northern Trust Corp reports 4.74% increase in ownership of GBZ / Winmark Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 35,407 shares of Winmark Corporation (DE:GBZ) valued at $15,138,264 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 33,805 shares of Winmark Corporation. This represents a change in shares of 4.74% during the quarter.

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)
2026-05-14 2026-03-31 13F WINMARK COM 974250102 35,407 1,602 4.74 15,138 10.59 0.0004
2026-02-17 2025-12-31 13F WINMARK COM 974250102 33,805 -2,151 -5.98 13,689 -23.52 0.0004
2025-11-14 2025-09-30 13F WINMARK COM 974250102 35,956 -6,080 -14.46 17,898 12.75 0.0005
2025-08-13 2025-06-30 13F WINMARK COM 974250102 42,036 -5,040 -10.71 15,873 6.07 0.0022
2025-05-13 2025-03-31 13F WINMARK COM 974250102 47,076 410 0.88 14,964 -18.42 0.0022
2025-02-14 2024-12-31 13F WINMARK COM 974250102 46,666 2,577 5.84 18,343 8.65 0.0026
2024-11-13 2024-09-30 13F WINMARK COM 974250102 44,089 737 1.70 16,883 10.44 0.0028
2024-08-14 2024-06-30 13F WINMARK COM 974250102 43,352 -1,774 -3.93 15,287 -6.34 0.0026
2024-05-14 2024-03-31 13F WINMARK COM 974250102 45,126 4,365 10.71 16,322 -4.10 0.0028
2024-02-13 2023-12-31 13F WINMARK COM 974250102 40,761 -1,711 -4.03 17,020 7.40 0.0031
2023-11-13 2023-09-30 13F WINMARK COM 974250102 42,472 4,357 11.43 15,848 25.06 0.0031
2023-08-11 2023-06-30 13F WINMARK COM 974250102 38,115 2,636 7.43 12,672 11.47 0.0024
2023-05-15 2023-03-31 13F WINMARK COM 974250102 35,479 5,966 20.21 11,369 63.33 0.0023
2023-02-13 2022-12-31 13F WINMARK COM 974250102 29,513 6 0.02 6,960 9.02 0.0015
2022-11-14 2022-09-30 13F WINMARK COM 974250102 29,507 -223 -0.75 6,384 9.79 0.0015
2022-08-12 2022-06-30 13F WINMARK COM 974250102 29,730 -4,759 -13.80 5,815 -23.36 0.0012
2022-05-13 2022-03-31 13F WINMARK COM 974250102 34,489 -1,303 -3.64 7,587 -14.62 0.0013
2022-02-08 2021-12-31 13F WINMARK COM 974250102 35,792 -311 -0.86 8,886 14.48 0.0015
2021-11-15 2021-09-30 13F WINMARK COM 974250102 36,103 -1,585 -4.21 7,762 7.21 0.0014
2021-08-13 2021-06-30 13F WINMARK COM 974250102 37,688 3,560 10.43 7,240 13.80 0.0013
2021-05-12 2021-03-31 13F WINMARK COM 974250102 34,128 -4,061 -10.63 6,362 -10.34 0.0012
2021-02-11 2020-12-31 13F WINMARK COM 974250102 38,189 -1,289 -3.27 7,096 4.37 0.0014
2020-11-16 2020-09-30 13F WINMARK COM 974250102 39,478 -220 -0.55 6,799 0.03 0.0015
2020-08-14 2020-06-30 13F WINMARK COM 974250102 39,698 3,438 9.48 6,797 47.12 0.0016
2020-05-14 2020-03-31 13F WINMARK COM 974250102 36,260 988 2.80 4,620 -33.95 0.0013
2020-02-14 2019-12-31 13F WINMARK COM 974250102 35,272 -393 -1.10 6,995 11.19 0.0016
2019-11-13 2019-09-30 13F WINMARK COM 974250102 35,665 -1,842 -4.91 6,291 -3.13 0.0015
2019-08-13 2019-06-30 13F WINMARK COM 974250102 37,507 -843 -2.20 6,494 -10.20 0.0015
2019-05-13 2019-03-31 13F WINMARK COM 974250102 38,350 609 1.61 7,232 20.53 0.0018
2019-02-12 2018-12-31 13F WINMARK COM 974250102 37,741 -390 -1.02 6,000 -5.21 0.0017
2018-11-14 2018-09-30 13F WINMARK COM 974250102 38,131 1,601 4.38 6,330 16.70 0.0015
2018-09-18 2018-06-30 13F/A-1 WINMARK COM 974250102 36,530 4,041 12.44 5,424 27.62 0.0014
2018-08-14 2018-06-30 13F WINMARK COM 974250102 36,779 4,290 5,461
2018-05-09 2018-03-31 13F WINMARK COM 974250102 32,489 -317 -0.97 4,250 0.12 0.0011
2018-02-14 2017-12-31 13F WINMARK COM 974250102 32,806 -3,137 -8.73 4,245 -10.35 0.0011
2017-11-13 2017-09-30 13F WINMARK COM 974250102 35,943 -367 -1.01 4,735 1.13 0.0012
2017-08-11 2017-06-30 13F WINMARK COM 974250102 36,310 1,901 5.52 4,682 20.39 0.0013
2017-05-12 2017-03-31 13F WINMARK COM 974250102 34,409 975 2.92 3,889 -7.80 0.0011
2017-02-13 2016-12-31 13F WINMARK COM 974250102 33,434 1,158 3.59 4,218 23.88 0.0013
2016-11-09 2016-09-30 13F WINMARK COM 974250102 32,276 1,289 4.16 3,405 10.27 0.0011
2016-08-12 2016-06-30 13F WINMARK COM 974250102 30,987 742 2.45 3,088 4.22 0.0010
2016-08-19 2016-03-31 13F/A-1 WINMARK COM 974250102 30,245 293 0.98 2,963 6.35 0.0010
2016-05-13 2016-03-31 13F WINMARK COM 974250102 30,245 2,963
2016-02-12 2015-12-31 13F WINMARK COM 974250102 29,952 2,650 9.71 2,786 -0.85 0.0009
2015-11-12 2015-09-30 13F WINMARK COM 974250102 27,302 27,302 0.00 2,810 0.0009
2015-08-13 2015-06-30 13F WINMARK COM 974250102 0 -28,898 -100.00 0 -100.00
2015-05-14 2015-03-31 13F WINMARK COM 974250102 28,898 -1,924 -6.24 2,531 -5.52 0.0008
2015-02-12 2014-12-31 13F WINMARK COM 974250102 30,822 -147 -0.47 2,679 17.71 0.0008
2014-11-13 2014-09-30 13F WINMARK COM 974250102 30,969 859 2.85 2,276 8.54 0.0007
2014-08-14 2014-06-30 13F WINMARK COM 974250102 30,110 -2,668 -8.14 2,097 -15.44 0.0007
2014-05-14 2014-03-31 13F WINMARK COM 974250102 32,778 -2,328 -6.63 2,480 -23.72 0.0008
2014-02-21 2013-12-31 13F/A-1 WINMARK COM 974250102 35,106 485 1.40 3,251 27.39 0.0010
2014-02-12 2013-12-31 13F WINMARK COM 974250102 35,106 3,251
2013-11-13 2013-09-30 13F WINMARK COM 974250102 34,621 -655 -1.86 2,552 11.49 0.0009
2013-08-09 2013-06-30 13F WINMARK COM 974250102 35,276 35,276 2,289 0.0008
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.