Winmark Corporation
DE ˙ DB ˙ US9742501029
SecurityDE:GBZ / Winmark Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership3,415 shares
Latest Disclosed Value $ 1,380,264
Sei Investments Co reports 4.72% increase in ownership of GBZ / Winmark Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 3,415 shares of Winmark Corporation (DE:GBZ) valued at $1,380,264 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 3,261 shares of Winmark Corporation. This represents a change in shares of 4.72% 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)
2026-02-13 2025-12-31 13F WINMARK COM 974250102 3,415 154 4.72 1,380 -15.08 0.0014
2025-11-13 2025-09-30 13F WINMARK COM 974250102 3,261 182 5.91 1,625 39.60 0.0017
2025-08-14 2025-06-30 13F WINMARK COM 974250102 3,079 1,093 55.04 1,165 84.18 0.0013
2025-05-14 2025-03-31 13F/A-1 WINMARK COM 974250102 1,986 152 8.29 633 -12.22 0.0008
2025-05-13 2025-03-31 13F WINMARK COM 974250102 1,986 152 641 0.0007
2025-02-11 2024-12-31 13F WINMARK COM 974250102 1,834 160 9.56 721 12.50 0.0009
2024-11-12 2024-09-30 13F WINMARK COM 974250102 1,674 240 16.74 641 26.73 0.0008
2024-08-13 2024-06-30 13F WINMARK COM 974250102 1,434 1,434 506 0.0007
2023-08-11 2023-06-30 13F WINMARK COM 974250102 0 -710 -100.00 0 -100.00
2023-05-12 2023-03-31 13F WINMARK COM 974250102 710 710 228 0.0004
2021-02-08 2020-12-31 13F WINMARK COM 974250102 0 -3,187 -100.00 0 -100.00
2020-12-04 2020-09-30 13F/A-1 WINMARK COM 974250102 3,187 1,978 163.61 549 165.22 0.0016
2020-11-06 2020-09-30 13F WINMARK COM 974250102 3,187 1,978 549 1,321.8699
2020-08-17 2020-06-30 13F/A-1 WINMARK COM 974250102 1,209 -6,975 -85.23 207 -80.13 0.0006
2020-08-11 2020-06-30 13F WINMARK COM 974250102 8,527 343 1,658 4,497.4133
2020-05-14 2020-03-31 13F WINMARK COM 974250102 8,184 -3 -0.04 1,042 -35.80 0.0038
2020-02-06 2019-12-31 13F WINMARK COM 974250102 8,187 -338 -3.96 1,623 7.98 0.0048
2019-11-12 2019-09-30 13F WINMARK COM 974250102 8,525 417 5.14 1,503 7.05 0.0038
2019-08-14 2019-06-30 13F WINMARK COM 974250102 8,108 -3 -0.04 1,404 -8.24 0.0046
2019-05-15 2019-03-31 13F WINMARK COM 974250102 8,111 285 3.64 1,530 18.06 0.0051
2019-02-13 2018-12-31 13F WINMARK COM 974250102 7,826 366 4.91 1,296 4.68 0.0046
2018-11-08 2018-09-30 13F WINMARK COM 974250102 7,460 88 1.19 1,238 13.16 0.0045
2018-08-03 2018-06-30 13F WINMARK COM 974250102 7,372 -3,754 -33.74 1,094 -24.81 0.0037
2018-05-11 2018-03-31 13F WINMARK COM 974250102 11,126 -66 -0.59 1,455 0.48 0.0056
2018-02-08 2017-12-31 13F WINMARK COM 974250102 11,192 0 0.00 1,448 -1.76 0.0050
2017-11-06 2017-09-30 13F WINMARK COM 974250102 11,192 1 0.01 1,474 2.15 0.0052
2017-07-31 2017-06-30 13F WINMARK COM 974250102 11,191 -842 -7.00 1,443 6.10 0.0058
2017-05-05 2017-03-31 13F WINMARK COM 974250102 12,033 0 0.00 1,360 -10.41 0.0060
2017-02-02 2016-12-31 13F WINMARK COM 974250102 12,033 11,700 3,513.51 1,518 4,237.14 0.0074
2016-11-04 2016-09-30 13F WINMARK COM 974250102 333 0 0.00 35 6.06 0.0002
2016-08-11 2016-06-30 13F WINMARK COM 974250102 333 0 0.00 33 0.00 0.0002
2016-05-10 2016-03-31 13F/A-1 WINMARK COM 974250102 333 0 0.00 33 6.45 0.0002
2016-02-03 2015-12-31 13F WINMARK COM 974250102 333 -4,200 -92.65 31 -93.36 0.0002
2015-11-02 2015-09-30 13F/A-1 WINMARK COM 974250102 4,533 4,533 467 0.0043
2015-10-30 2015-09-30 13F WINMARK COM 974250102 4,533 467
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.