Microsoft Corporation
MX ˙ BMV ˙ US5949181045
SecurityMX:MSFT / Microsoft Corporation
InstitutionCorundum Group, Inc.
Latest Disclosed Ownership12,459 shares
Latest Disclosed Value $ 4,611,948
Corundum Group, Inc. reports 18.33% decrease in ownership of MSFT / Microsoft Corporation

On April 20, 2026 - Corundum Group, Inc. filed a 13F-HR form disclosing ownership of 12,459 shares of Microsoft Corporation (MX:MSFT) valued at $4,611,948 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 15,256 shares of Microsoft Corporation. This represents a change in shares of -18.33% 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)
2026-04-20 2026-03-31 13F MICROSOFT CS 594918104 12,459 -2,797 -18.33 4,612 -37.50 1.5414
2026-01-12 2025-12-31 13F MICROSOFT CS 594918104 15,256 326 2.18 7,378 -4.58 2.4759
2025-10-24 2025-09-30 13F MICROSOFT CS 594918104 14,930 -180 -1.19 7,733 2.89 3.1772
2025-07-21 2025-06-30 13F MICROSOFT CS 594918104 15,110 -820 -5.15 7,516 25.69 3.3232
2025-04-23 2025-03-31 13F MICROSOFT CS 594918104 15,930 -1,797 -10.14 5,980 -19.97 2.8680
2025-01-16 2024-12-31 13F MICROSOFT CS 594918104 17,727 452 2.62 7,472 0.51 2.7901
2024-10-21 2024-09-30 13F MICROSOFT CS 594918104 17,275 -1,817 -9.52 7,433 -12.89 3.3913
2024-07-17 2024-06-30 13F MICROSOFT CS 594918104 19,092 1,447 8.20 8,533 14.95 3.3338
2024-04-15 2024-03-31 13F MICROSOFT CS 594918104 17,645 -491 -2.71 7,424 8.86 3.5804
2024-01-24 2023-12-31 13F MICROSOFT CS 594918104 18,136 258 1.44 6,820 20.82 3.4194
2023-10-17 2023-09-30 13F MICROSOFT CS 594918104 17,878 -922 -4.90 5,645 -11.84 3.2074
2023-07-21 2023-06-30 13F MICROSOFT CS 594918104 18,800 5,101 37.24 6,402 62.12 3.1932
2023-04-24 2023-03-31 13F MICROSOFT CS 594918104 13,699 -470 -3.32 3,949 131,533.33 1.8681
2023-01-12 2022-12-31 13F MICROSOFT CS 594918104 14,169 -278 -1.92 3 -99.91 1.9187
2022-10-18 2022-09-30 13F MICROSOFT CS 594918104 14,447 2,583 21.77 3,365 10.44 2.1169
2022-07-25 2022-06-30 13F MICROSOFT CS 594918104 11,864 722 6.48 3,047 -11.30 2.0584
2022-05-02 2022-03-31 13F MICROSOFT CS 594918104 11,142 2,774 33.15 3,435 22.07 3.1925
2022-02-07 2021-12-31 13F MICROSOFT CS 594918104 8,368 885 11.83 2,814 33.36 1.8321
2021-11-02 2021-09-30 13F MICROSOFT CS 594918104 7,483 -705 -8.61 2,110 -4.87 1.5643
2021-08-02 2021-06-30 13F MICROSOFT CS 594918104 8,188 187 2.34 2,218 17.60 1.4547
2021-05-10 2021-03-31 13F MICROSOFT CS 594918104 8,001 -5 -0.06 1,886 5.90 1.4739
2021-02-03 2020-12-31 13F MICROSOFT CS 594918104 8,006 101 1.28 1,781 7.10 1.4840
2020-11-12 2020-09-30 13F/A-1 MICROSOFT CS 594918104 7,905 994 14.38 1,663 18.28 1.6110
2020-08-07 2020-06-30 13F/A-1 MICROSOFT CS 594918104 6,911 9 0.13 1,406 29.11 1.6860
2020-05-07 2020-03-31 13F/A-1 MICROSOFT CS 594918104 6,902 -239 -3.35 1,089 -3.29 1.5484
2020-01-28 2019-12-31 13F MICROSOFT CS 594918104 7,141 16 0.22 1,126 13.62 1.1825
2019-11-01 2019-09-30 13F/A-1 MICROSOFT CS 594918104 7,125 -13 -0.18 991 3.66 1.1479
2019-08-02 2019-06-30 13F MICROSOFT CS 594918104 7,138 471 7.06 956 21.63 1.0983
2019-05-08 2019-03-31 13F MICROSOFT CS 594918104 6,667 -5,184 -43.74 786 -34.72 0.8992
2019-02-19 2018-12-31 13F MICROSOFT CS 594918104 11,851 6,182 109.05 1,204 115.38 1.1053
2018-08-07 2018-06-30 13F MICROSOFT CS 594918104 5,669 -107 -1.85 559 6.07 0.6892
2018-05-08 2018-03-31 13F MICROSOFT CS 594918104 5,776 -2,721 -32.02 527 -27.51 0.5699
2018-02-13 2017-12-31 13F MICROSOFT COM 594918104 8,497 -1,615 -15.97 727 -3.45 0.7845
2017-11-03 2017-09-30 13F MICROSOFT COM 594918104 10,112 976 10.68 753 19.52 0.7937
2017-08-01 2017-06-30 13F MICROSOFT CS 594918104 9,136 917 11.16 630 16.45 1.3958
2017-04-18 2017-03-31 13F MICROSOFT CS 594918104 8,219 125 1.54 541 7.55 0.6822
2017-02-09 2016-12-31 13F MICROSOFT CS 594918104 8,094 803 11.01 503 19.76 0.7394
2016-11-04 2016-09-30 13F MICROSOFT CS 594918104 7,291 561 8.34 420 22.09 0.6792
2016-07-29 2016-06-30 13F MICROSOFT CS 594918104 6,730 -1,827 -21.35 344 -27.27 0.5291
2016-05-16 2016-03-31 13F MICROSOFT CS 594918104 8,557 1,703 24.85 473 25.13 1.2463
2016-02-11 2015-12-31 13F MICROSOFT CS 594918104 6,854 988 16.84 378 45.38 1.1306
2015-11-05 2015-09-30 13F MICROSOFT CS 594918104 5,866 -195 -3.22 260 -2.99 0.9217
2015-08-11 2015-06-30 13F MICROSOFT CS 594918104 6,061 59 0.98 268 9.84 0.9443
2015-05-08 2015-03-31 13F MICROSOFT CS 594918104 6,002 6,002 0.00 244 0.8245
2015-02-05 2014-12-31 13F MICROSOFT CS 594918104 0 -6,122 -100.00 0 -100.00
2014-11-04 2014-09-30 13F MICROSOFT CS 594918104 6,122 -161 -2.56 284 8.40 1.3464
2014-08-05 2014-06-30 13F MICROSOFT CS 594918104 6,283 254 4.21 262 6.07 1.2284
2014-05-08 2014-03-31 13F MICROSOFT CS 594918104 6,029 -341 -5.35 247 3.78 1.1967
2014-02-19 2013-12-31 13F MICROSOFT CS 594918104 6,370 -87 -1.35 238 10.70 1.1178
2013-11-13 2013-09-30 13F MICROSOFT CS 594918104 6,457 4 0.06 215 -3.59 1.2042
2013-08-13 2013-06-30 13F MICROSOFT CS 594918104 6,453 6,453 223 1.3728
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.