MGIC Investment Corporation
MX ˙ BMV ˙ US5528481030
SecurityMX:MTG / MGIC Investment Corporation
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership1,437,430 shares
Latest Disclosed Value $ 37,732,541
Robeco Institutional Asset Management B.V. reports 12.41% increase in ownership of MTG / MGIC Investment Corporation

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 1,437,430 shares of MGIC Investment Corporation (MX:MTG) valued at $37,732,541 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 1,278,759 shares of MGIC Investment Corporation. This represents a change in shares of 12.41% 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)
2026-04-21 2026-03-31 13F MGIC INVT CORP WIS COM 552848103 1,437,430 158,671 12.41 37,733 0.98 0.0538
2026-01-23 2025-12-31 13F MGIC INVT CORP WIS COM 552848103 1,278,759 -55,793 -4.18 37,365 -1.31 0.0532
2025-10-22 2025-09-30 13F MGIC INVT CORP WIS COM 552848103 1,334,552 275,621 26.03 37,861 28.43 0.0548
2025-07-18 2025-06-30 13F MGIC INVT CORP WIS COM 552848103 1,058,931 240,148 29.33 29,481 45.30 0.0477
2025-04-23 2025-03-31 13F MGIC INVT CORP WIS COM 552848103 818,783 11,298 1.40 20,289 5.98 0.0394
2025-01-23 2024-12-31 13F MGIC INVT CORP WIS COM 552848103 807,485 9,031 1.13 19,145 -6.34 0.0363
2024-10-29 2024-09-30 13F MGIC INVT CORP WIS COM 552848103 798,454 -65,177 -7.55 20,440 9.83 0.0406
2024-07-23 2024-06-30 13F MGIC INVT CORP WIS COM 552848103 863,631 -360,768 -29.46 18,611 -32.02 0.0400
2024-04-24 2024-03-31 13F MGIC INVT CORP WIS COM 552848103 1,224,399 -88,643 -6.75 27,378 8.09 0.0595
2024-02-14 2023-12-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 1,313,042 519,909 65.55 25,329 91.34 0.0614
2024-02-08 2023-12-31 13F MGIC INVT CORP WIS COM 552848103 1,106,691 313,558 1,313 0.2459
2023-10-24 2023-09-30 13F MGIC INVT CORP WIS COM 552848103 793,133 413,561 108.95 13,237 120.87 0.0354
2023-07-24 2023-06-30 13F MGIC INVT CORP WIS COM 552848103 379,572 -19,282 -4.83 5,993 11.98 0.0157
2023-05-04 2023-03-31 13F MGIC INVT CORP WIS COM 552848103 398,854 69,768 21.20 5,353 25.11 0.0146
2023-02-07 2022-12-31 13F MGIC INVT CORP WIS COM 552848103 329,086 236,886 256.93 4,278 261.62 0.0123
2022-12-01 2022-09-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 92,200 3,280 3.69 1,183 5.63 0.0038
2022-10-27 2022-09-30 13F MGIC INVT CORP WIS COM 552848103 92,200 3,280 1,183 0.0038
2022-12-01 2022-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 88,920 0 0.00 1,120 -7.05 0.0035
2022-07-27 2022-06-30 13F MGIC INVT CORP WIS COM 552848103 88,920 0 1,120 0.0034
2022-12-01 2022-03-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 88,920 0 0.00 1,205 -6.01 0.0028
2022-04-26 2022-03-31 13F MGIC INVT CORP WIS COM 552848103 88,920 0 1,205 0.0028
2022-12-01 2021-12-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 88,920 -8,139 -8.39 1,282 -11.65 0.0027
2022-01-31 2021-12-31 13F MGIC INVT CORP WIS COM 552848103 88,920 -8,139 1,282 0.0027
2022-12-01 2021-09-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 97,059 -4,203 -4.15 1,451 5.37 0.0032
2021-10-20 2021-09-30 13F MGIC INVT CORP WIS COM 552848103 97,059 -4,203 1,451 0.0032
2022-12-01 2021-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 101,262 0 0.00 1,377 -1.78 0.0031
2021-07-28 2021-06-30 13F MGIC INVT CORP WIS COM 552848103 101,262 0 1,377 0.0030
2022-12-01 2021-03-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 101,262 0 0.00 1,402 10.31 0.0035
2021-04-23 2021-03-31 13F MGIC INVT CORP WIS COM 552848103 101,262 0 1,402 0.0034
2022-12-01 2020-12-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 101,262 -20,623 -16.92 1,271 17.69 0.0033
2021-01-28 2020-12-31 13F MGIC INVT CORP WIS COM 552848103 101,262 -20,623 1,271 0.0033
2021-01-19 2020-09-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 121,885 47,453 63.75 1,080 77.34 0.0033
2020-10-29 2020-09-30 13F MGIC INVT CORP WIS COM 552848103 121,885 47,453 1,080 3,335.3915
2021-01-19 2020-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 74,432 -79,752 -51.73 609 -37.79 0.0021
2020-07-20 2020-06-30 13F MGIC INVT CORP WIS COM 552848103 74,432 -79,752 609 2,066.4456
2021-01-19 2020-03-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 154,184 0 0.00 979 -55.19 0.0039
2020-04-30 2020-03-31 13F MGIC INVT CORP WIS COM 552848103 154,184 0 979 3,924.0528
2021-01-19 2019-12-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 154,184 0 0.00 2,185 12.69 0.0070
2020-02-06 2019-12-31 13F MGIC INVT CORP WIS COM 552848103 154,184 0 2,185 6,988.5545
2021-01-19 2019-09-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 154,184 -69,157 -30.96 1,939 -33.91 0.0068
2019-10-17 2019-09-30 13F MGIC INVT CORP WIS COM 552848103 154,184 -69,157 1,939 6,835.7724
2021-01-19 2019-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 223,341 223,341 2,934 0.0104
2019-07-19 2019-06-30 13F MGIC INVT CORP WIS COM 552848103 223,341 223,341 2,934 10,346.0514
2021-01-19 2018-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 0 -352,888 -100.00 0 -100.00
2021-01-19 2018-03-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 352,888 0 0.00 4,588 -7.87 0.0215
2018-05-07 2018-03-31 13F MGIC INVT CORP WIS COM 552848103 352,888 0 4,588 21,455.9298
2021-01-19 2017-12-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 352,888 0 0.00 4,980 12.62 0.0258
2018-01-25 2017-12-31 13F MGIC INVT CORP WIS COM 552848103 352,888 0 4,980
2021-01-19 2017-09-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 352,888 0 0.00 4,422 11.89 0.0275
2017-10-17 2017-09-30 13F MGIC INVT CORP WIS COM 552848103 352,888 0 4,422 27,395.8413
2021-01-19 2017-06-30 13F/A-1 MGIC INVT CORP WIS COM 552848103 352,888 0 0.00 3,952 10.58 0.0255
2017-08-07 2017-06-30 13F MGIC INVT CORP WIS COM 552848103 352,888 0 3,952 25,730.7028
2021-01-19 2017-03-31 13F/A-1 MGIC INVT CORP WIS COM 552848103 352,888 352,888 3,574 0.0238
2017-05-15 2017-03-31 13F MGIC INVT CORP WIS COM 552848103 352,888 3,574
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.