Winmark Corporation
DE ˙ DB ˙ US9742501029
SecurityDE:GBZ / Winmark Corporation
InstitutionPort Capital LLC
Latest Disclosed Ownership98,186 shares
Latest Disclosed Value $ 41,979,424
Port Capital LLC reports 0.00% decrease in ownership of GBZ / Winmark Corporation

On May 15, 2026 - Port Capital LLC filed a 13F-HR form disclosing ownership of 98,186 shares of Winmark Corporation (DE:GBZ) valued at $41,979,424 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 98,188 shares of Winmark Corporation. This represents a change in shares of -0.00% 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)
2026-05-15 2026-03-31 13F WINMARK COM 974250102 98,186 -2 -0.00 41,979 5.58 1.8668
2026-02-17 2025-12-31 13F WINMARK COM 974250102 98,188 70 0.07 39,760 -18.59 1.7148
2025-11-14 2025-09-30 13F WINMARK COM 974250102 98,118 -10,043 -9.29 48,840 19.58 2.0355
2025-08-14 2025-06-30 13F WINMARK COM 974250102 108,161 760 0.71 40,843 19.63 1.7368
2025-05-15 2025-03-31 13F WINMARK COM 974250102 107,401 1,485 1.40 34,140 -18.00 1.5479
2025-02-14 2024-12-31 13F WINMARK COM 974250102 105,916 -679 -0.64 41,632 1.99 1.9001
2024-11-14 2024-09-30 13F WINMARK COM 974250102 106,595 -5,681 -5.06 40,818 3.10 1.8295
2024-08-14 2024-06-30 13F WINMARK CORP COM COM 974250102 112,276 525 0.47 39,592 -2.05 1.9837
2024-05-15 2024-03-31 13F WINMARK CORP COM COM 974250102 111,751 1,435 1.30 40,420 -12.25 2.0261
2024-02-15 2023-12-31 13F WINMARK CORP COM COM 974250102 110,316 1,461 1.34 46,062 13.41 2.5696
2023-11-14 2023-09-30 13F WINMARK CORP COM COM 974250102 108,855 -5,309 -4.65 40,617 7.01 2.5351
2023-08-14 2023-06-30 13F WINMARK CORP COM COM 974250102 114,164 -21,676 -15.96 37,956 -12.80 2.2835
2023-05-15 2023-03-31 13F WINMARK CORP COM COM 974250102 135,840 7,925 6.20 43,527 44.29 2.8286
2023-02-15 2022-12-31 13F WINMARK CORP COM COM 974250102 127,915 10,264 8.72 30,166 18.52 2.1806
2022-11-14 2022-09-30 13F WINMARK CORP COM COM 974250102 117,651 1,725 1.49 25,453 12.27 2.0666
2022-08-15 2022-06-30 13F WINMARK CORP COM COM 974250102 115,926 -820 -0.70 22,672 -11.73 1.7753
2022-05-16 2022-03-31 13F WINMARK CORP COM COM 974250102 116,746 -5,774 -4.71 25,684 -15.57 1.7757
2022-02-14 2021-12-31 13F WINMARK CORP COM COM 974250102 122,520 -87,899 -41.77 30,420 -32.77 1.8709
2021-11-15 2021-09-30 13F WINMARK CORP COM COM 974250102 210,419 4,452 2.16 45,246 14.37 2.2839
2021-08-16 2021-06-30 13F WINMARK CORP COM COM 974250102 205,967 7,165 3.60 39,562 6.74 2.0599
2021-05-17 2021-03-31 13F WINMARK CORP COM COM 974250102 198,802 61,366 44.65 37,063 45.14 2.0983
2021-02-16 2020-12-31 13F WINMARK CORP COM COM 974250102 137,436 11,413 9.06 25,536 17.68 1.7377
2020-11-16 2020-09-30 13F WINMARK CORP COM COM 974250102 126,023 13,733 12.23 21,699 12.85 1.8695
2020-08-17 2020-06-30 13F/A-1 WINMARK CORP COM COM 974250102 112,290 64,128 133.15 19,229 213.33 1.8531
2020-08-14 2020-06-30 13F WINMARK CORP COM COM 974250102 70,503 22,341 12,073 1,399,370.6136
2020-05-15 2020-03-31 13F WINMARK CORP COM COM 974250102 48,162 2,961 6.55 6,137 -31.53 0.8536
2020-02-14 2019-12-31 13F WINMARK CORP COM COM 974250102 45,201 7,945 21.33 8,963 36.38 0.9890
2019-11-14 2019-09-30 13F WINMARK CORP COM COM 974250102 37,256 3,746 11.18 6,572 13.27 0.7500
2019-08-14 2019-06-30 13F WINMARK CORP COM COM 974250102 33,510 3,706 12.43 5,802 3.22 0.6839
2019-05-15 2019-03-31 13F WINMARK CORP COM COM 974250102 29,804 3,649 13.95 5,621 35.15 0.7352
2019-02-13 2018-12-31 13F WINMARK COM 974250102 26,155 2,175 9.07 4,159 4.47 0.6322
2018-11-14 2018-09-30 13F WINMARK CORP COM COM 974250102 23,980 3,041 14.52 3,981 28.09 0.4825
2018-07-11 2018-06-30 13F WINMARK COM 974250102 20,939 3,324 18.87 3,108 34.90 0.4060
2018-05-08 2018-03-31 13F/A-1 WINMARK COM 974250102 17,615 555 3.25 2,304 4.35 0.3258
2018-05-07 2018-03-31 13F WINMARK CORP COM COM 974250102 17,615 555 2,304
2018-03-01 2017-12-31 13F/A-1 WINMARK CORP COM COM 974250102 17,060 17,060 2,208 0.3119
2018-01-25 2017-12-31 13F WINMARK CORP COM COM 974250102 12,517 1,620 0.7225
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.