Wintrust Financial Corporation
US ˙ NasdaqGS ˙ US97650W1080

SecurityWTFC / Wintrust Financial Corporation
InstitutionMairs & Power Inc
Latest Disclosed Ownership57,744 shares
Latest Disclosed Value $ 8,022,951
Mairs & Power Inc reports 23.83% increase in ownership of WTFC / Wintrust Financial Corporation

On May 13, 2026 - Mairs & Power Inc filed a 13F-HR form disclosing ownership of 57,744 shares of Wintrust Financial Corporation (US:WTFC) valued at $8,022,951 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 46,633 shares of Wintrust Financial Corporation. This represents a change in shares of 23.83% during the quarter. The current value of the position is $8,547,267 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)
2026-05-13 2026-03-31 13F WINTRUST FINL COM 97650W108 57,744 11,111 23.83 8,023 23.04 0.0820
2026-02-17 2025-12-31 13F WINTRUST FINL COM 97650W108 46,633 -4,216 -8.29 6,520 -3.18 0.0628
2025-11-14 2025-09-30 13F WINTRUST FINL COM 97650W108 50,849 169 0.33 6,734 7.18 0.0633
2025-08-14 2025-06-30 13F WINTRUST FINL COM 97650W108 50,680 -14,695 -22.48 6,283 -14.54 0.0620
2025-05-15 2025-03-31 13F WINTRUST FINL COM 97650W108 65,375 -20,760 -24.10 7,352 -31.55 0.0765
2025-02-14 2024-12-31 13F WINTRUST FINL COM 97650W108 86,135 -40 -0.05 10,742 14.85 0.1039
2024-11-14 2024-09-30 13F WINTRUST FINL COM 97650W108 86,175 -14,530 -14.43 9,353 -5.77 0.0880
2024-08-14 2024-06-30 13F WINTRUST FINL COM 97650W108 100,705 -20,455 -16.88 9,925 -21.52 0.0959
2024-05-15 2024-03-31 13F WINTRUST FINL COM 97650W108 121,160 -30,605 -20.17 12,648 -10.15 0.1225
2024-02-14 2023-12-31 13F WINTRUST FINL COM 97650W108 151,765 -13,592 -8.22 14,076 12.75 0.1483
2023-11-14 2023-09-30 13F WINTRUST FINL COM 97650W108 165,357 -38,561 -18.91 12,484 -15.69 0.1465
2023-08-14 2023-06-30 13F WINTRUST FINL COM 97650W108 203,918 20,360 11.09 14,809 10.59 0.1611
2023-05-15 2023-03-31 13F WINTRUST FINL COM 97650W108 183,558 22,133 13.71 13,391 -1.85 0.1545
2023-02-14 2022-12-31 13F WINTRUST FINL COM 97650W108 161,425 0 0.00 13,644 3.64 0.1642
2022-11-14 2022-09-30 13F WINTRUST FINL COM 97650W108 161,425 -107 -0.07 13,164 1.68 0.1661
2022-08-15 2022-06-30 13F WINTRUST FINL COM 97650W108 161,532 -89 -0.06 12,947 -13.80 0.1552
2022-05-16 2022-03-31 13F WINTRUST FINL COM 97650W108 161,621 -29,522 -15.44 15,019 -13.49 0.1513
2022-02-14 2021-12-31 13F WINTRUST FINL COM 97650W108 191,143 -43,798 -18.64 17,360 -8.06 0.1608
2021-11-15 2021-09-30 13F WINTRUST FINL COM 97650W108 234,941 -182 -0.08 18,882 6.19 0.1889
2021-08-16 2021-06-30 13F WINTRUST FINL COM 97650W108 235,123 -12,416 -5.02 17,782 -5.23 0.1757
2021-05-14 2021-03-31 13F WINTRUST FINL COM 97650W108 247,539 -10,890 -4.21 18,763 18.85 0.1970
2021-02-16 2020-12-31 13F WINTRUST FINL COM 97650W108 258,429 -34,166 -11.68 15,787 34.72 0.1754
2020-11-16 2020-09-30 13F WINTRUST FINL COM 97650W108 292,595 175 0.06 11,718 -8.13 0.1463
2020-08-14 2020-06-30 13F WINTRUST FINL COM 97650W108 292,420 28,035 10.60 12,755 46.81 0.1666
2020-05-15 2020-03-31 13F WINTRUST FINL COM 97650W108 264,385 41,100 18.41 8,688 -45.12 0.1268
2020-02-14 2019-12-31 13F Wintrust Finan COM 97650W108 223,285 80 0.04 15,831 9.74 0.1798
2019-11-14 2019-09-30 13F Wintrust Finan COM 97650W108 223,205 10,920 5.14 14,426 -7.11 0.1744
2019-08-14 2019-06-30 13F Wintrust Finan COM 97650W108 212,285 0 0.00 15,531 8.66 0.1863
2019-05-15 2019-03-31 13F Wintrust Finan COM 97650W108 212,285 16,170 8.25 14,293 9.61 0.1736
2019-02-14 2018-12-31 13F Wintrust Finan COM 97650W108 196,115 28,135 16.75 13,040 -8.61 0.1759
2018-11-14 2018-09-30 13F Wintrust Finan COM 97650W108 167,980 15,100 9.88 14,268 7.21 0.1661
2018-08-14 2018-06-30 13F Wintrust Finan COM 97650W108 152,880 -14,200 -8.50 13,308 -7.44 0.1650
2018-05-15 2018-03-31 13F Wintrust Finan COM 97650W108 167,080 -8,800 -5.00 14,377 -0.76 0.1775
2018-02-14 2017-12-31 13F Wintrust Finan COM 97650W108 175,880 -27,550 -13.54 14,487 -9.06 0.1680
2017-11-14 2017-09-30 13F Wintrust Finan COM 97650W108 203,430 -5,900 -2.82 15,931 -0.44 0.1913
2017-08-14 2017-06-30 13F Wintrust Finan COM 97650W108 209,330 16,080 8.32 16,001 19.79 0.1934
2017-05-15 2017-03-31 13F Wintrust Finan COM 97650W108 193,250 18,350 10.49 13,357 5.24 0.1636
2017-02-14 2016-12-31 13F Wintrust Finan COM 97650W108 174,900 5,670 3.35 12,692 34.96 0.1630
2016-11-14 2016-09-30 13F Wintrust Finan COM 97650W108 169,230 8,700 5.42 9,404 14.87 0.1240
2016-08-15 2016-06-30 13F Wintrust Finan COM 97650W108 160,530 8,500 5.59 8,187 21.45 0.1105
2016-05-16 2016-03-31 13F Wintrust Finan COM 97650W108 152,030 22,600 17.46 6,741 7.34 0.0958
2016-02-16 2015-12-31 13F Wintrust Finan COM 97650W108 129,430 4,100 3.27 6,280 -6.21 0.0941
2015-11-16 2015-09-30 13F Wintrust Finan COM 97650W108 125,330 -10,580 -7.78 6,696 -7.71 0.1047
2015-08-14 2015-06-30 13F Wintrust Finan COM 97650W108 135,910 14,710 12.14 7,255 25.54 0.1027
2015-05-15 2015-03-31 13F Wintrust Finan COM 97650W108 121,200 17,600 16.99 5,779 19.30 0.0795
2015-02-17 2014-12-31 13F Wintrust Finan COM 97650W108 103,600 12,500 13.72 4,844 19.05 0.0672
2014-11-14 2014-09-30 13F Wintrust Finan COM 97650W108 91,100 0 0.00 4,069 -2.91 0.0594
2014-08-14 2014-06-30 13F Wintrust Finan COM 97650W108 91,100 10,300 12.75 4,191 6.59 0.0594
2014-05-15 2014-03-31 13F Wintrust Finan COM 97650W108 80,800 7,800 10.68 3,932 16.78 0.0583
2014-02-14 2013-12-31 13F Wintrust Finan COM 97650W108 73,000 10,700 17.17 3,367 31.57 0.0518
2013-11-14 2013-09-30 13F Wintrust Finan COM 97650W108 62,300 8,800 16.45 2,559 24.95 0.0442
2013-08-14 2013-06-30 13F Wintrust Finan COM 97650W108 53,500 53,500 2,048 0.0391
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.