Microsoft Corporation
BG ˙ BUL ˙ US5949181045
SecurityBG:MSF / Microsoft Corporation
InstitutionMain Street Research LLC
Latest Disclosed Ownership67,542 shares
Latest Disclosed Value $ 25,001,923
Main Street Research LLC reports 59.85% decrease in ownership of MSF / Microsoft Corporation

On April 30, 2026 - Main Street Research LLC filed a 13F-HR form disclosing ownership of 67,542 shares of Microsoft Corporation (BG:MSF) valued at $25,001,923 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 168,207 shares of Microsoft Corporation. This represents a change in shares of -59.85% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-30 2026-03-31 13F MICROSOFT COM 594918104 67,542 -100,665 -59.85 25,002 -69.27 1.4548
2026-02-09 2025-12-31 13F MICROSOFT COM 594918104 168,207 43 0.03 81,348 -6.60 4.6533
2025-11-13 2025-09-30 13F MICROSOFT COM 594918104 168,164 73,462 77.57 87,101 84.91 4.7061
2025-08-05 2025-06-30 13F MICROSOFT COM 594918104 94,702 -38,919 -29.13 47,106 -6.09 2.9322
2025-04-30 2025-03-31 13F MICROSOFT COM 594918104 133,621 3,859 2.97 50,160 -8.29 3.2775
2025-02-07 2024-12-31 13F MICROSOFT COM 594918104 129,762 4,339 3.46 54,694 1.34 3.4078
2024-11-12 2024-09-30 13F MICROSOFT COM 594918104 125,423 2,722 2.22 53,969 -1.59 3.3959
2024-07-29 2024-06-30 13F MICROSOFT COM 594918104 122,701 3,525 2.96 54,841 9.37 3.6172
2024-05-01 2024-03-31 13F MICROSOFT COM 594918104 119,176 342 0.29 50,141 12.21 3.4089
2024-01-30 2023-12-31 13F MICROSOFT COM 594918104 118,834 2,230 1.91 44,686 21.37 3.5882
2023-11-03 2023-09-30 13F MICROSOFT COM 594918104 116,604 55,490 90.80 36,818 76.91 3.7932
2023-08-08 2023-06-30 13F MICROSOFT COM 594918104 61,114 806 1.34 20,812 19.70 3.3169
2023-05-01 2023-03-31 13F MICROSOFT COM 594918104 60,308 44,612 284.23 17,387 361.90 3.4331
2023-02-06 2022-12-31 13F MICROSOFT COM 594918104 15,696 996 6.78 3,764 9.93 0.9167
2022-11-14 2022-09-30 13F MICROSOFT COM 594918104 14,700 3,878 35.83 3,424 23.17 0.7541
2022-08-12 2022-06-30 13F MICROSOFT COM 594918104 10,822 -95,521 -89.82 2,780 -91.52 0.7288
2022-05-05 2022-03-31 13F MICROSOFT COM 594918104 106,343 -40,052 -27.36 32,787 -33.41 3.0815
2022-02-09 2021-12-31 13F MICROSOFT COM 594918104 146,395 5,316 3.77 49,236 23.79 3.8014
2021-11-12 2021-09-30 13F MICROSOFT COM 594918104 141,079 6,051 4.48 39,773 8.73 3.4805
2021-08-06 2021-06-30 13F Microsoft COM 594918104 135,028 12,299 10.02 36,579 26.41 2.9360
2021-05-07 2021-03-31 13F Microsoft COM 594918104 122,729 7,849 6.83 28,936 13.24 2.7216
2021-02-12 2020-12-31 13F Microsoft COM 594918104 114,880 7,709 7.19 25,552 13.36 2.7482
2020-11-10 2020-09-30 13F Microsoft COM 594918104 107,171 3,772 3.65 22,541 7.12 2.8704
2020-07-29 2020-06-30 13F Microsoft COM 594918104 103,399 7,220 7.51 21,043 38.73 3.3025
2020-05-01 2020-03-31 13F Microsoft COM 594918104 96,179 3,942 4.27 15,168 4.28 3.7160
2020-01-28 2019-12-31 13F Microsoft COM 594918104 92,237 81,844 787.49 14,546 906.64 2.2937
2019-10-21 2019-09-30 13F Microsoft COM 594918104 10,393 233 2.29 1,445 6.17 0.2710
2019-08-08 2019-06-30 13F Microsoft COM 594918104 10,160 -32 -0.31 1,361 13.23 0.3062
2019-05-13 2019-03-31 13F Microsoft COM 594918104 10,192 542 5.62 1,202 22.65 0.3821
2019-02-13 2018-12-31 13F Microsoft COM 594918104 9,650 -10,488 -52.08 980 -57.45 0.3811
2018-11-05 2018-09-30 13F Microsoft COM 594918104 20,138 5,571 38.24 2,303 60.38 0.3307
2018-07-25 2018-06-30 13F Microsoft COM 594918104 14,567 -183 -1.24 1,436 6.69 0.2248
2018-05-08 2018-03-31 13F/A-1 Microsoft COM 594918104 14,750 4,789 48.08 1,346 57.98 0.2130
2018-05-08 2018-03-31 13F Microsoft COM 594918104 9,961 0 852
2018-02-05 2017-12-31 13F Microsoft COM 594918104 9,961 1,580 18.85 852 36.54 0.1297
2017-10-16 2017-09-30 13F Microsoft COM 594918104 8,381 -2,640 -23.95 624 -17.89 0.1007
2017-07-18 2017-06-30 13F Microsoft COM 594918104 11,021 2,673 32.02 760 38.18 0.1242
2017-05-04 2017-03-31 13F Microsoft COM 594918104 8,348 -988 -10.58 550 -5.17 0.0963
2017-02-03 2016-12-31 13F Microsoft COM 594918104 9,336 2,774 42.27 580 53.44 0.1129
2016-11-10 2016-09-30 13F Microsoft COM 594918104 6,562 -254 -3.73 378 8.31 0.0739
2016-08-11 2016-06-30 13F Microsoft COM 594918104 6,816 1,423 26.39 349 17.11 0.0721
2016-05-13 2016-03-31 13F Microsoft COM 594918104 5,393 345 6.83 298 6.43 0.0768
2016-02-04 2015-12-31 13F Microsoft COM 594918104 5,048 0 0.00 280 5.26 0.0598
2015-11-12 2015-09-30 13F Microsoft COM 594918104 5,048 -456 -8.28 266 9.47 0.0624
2015-07-23 2015-06-30 13F Microsoft COM 594918104 5,504 45 0.82 243 9.46 0.0498
2015-05-12 2015-03-31 13F Microsoft COM 594918104 5,459 1,099 25.21 222 9.36 0.0477
2015-02-09 2014-12-31 13F Microsoft COM 594918104 4,360 -8,918 -67.16 203 -59.15 0.0435
2014-02-06 2013-12-31 13F Microsoft COM 594918104 13,278 383 2.97 497 15.85 0.1241
2013-11-12 2013-09-30 13F Microsoft COM 594918104 12,895 -3,492 -21.31 429 -24.20 0.1159
2013-08-01 2013-06-30 13F Microsoft COM 594918104 16,387 16,387 566 0.1709
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.