Microsoft Corporation
MX ˙ BMV ˙ US5949181045
SecurityMX:MSFT / Microsoft Corporation
InstitutionBlair William & Co/il
Latest Disclosed Ownership3,498,110 shares
Latest Disclosed Value $ 1,294,895,307
Blair William & Co/il ownership in MSFT / Microsoft Corporation

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 3,498,110 shares of Microsoft Corporation (MX:MSFT) valued at $1,294,895,307 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,574,568 shares of Microsoft Corporation. This represents a change in shares of -2.14% during the quarter.

Blair William & Co/il has a history of taking positions in derivatives of the underlying security (MSFT) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:MSFT / Microsoft Corporation Historical Put/Call Ratio
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)
2026-05-08 2026-03-31 13F MICROSOFT COM 594918104 3,498,110 -76,458 -2.14 1,294,895 -25.10 3.7107
2026-02-17 2025-12-31 13F MICROSOFT COM 594918104 3,574,568 -32,538 -0.90 1,728,732 -7.47 4.6397
2025-11-12 2025-09-30 13F MICROSOFT COM 594918104 3,607,106 -89,598 -2.42 1,868,301 1.61 4.9730
2025-07-24 2025-06-30 13F MICROSOFT COM 594918104 3,696,704 -69,498 -1.85 1,838,778 30.06 5.1074
2025-05-09 2025-03-31 13F MICROSOFT COM 594918104 3,766,202 -45,568 -1.20 1,413,794 -12.00 4.2640
2025-02-12 2024-12-31 13F MICROSOFT COM 594918104 3,811,770 43,033 1.14 1,606,661 -0.93 4.6734
2024-11-12 2024-09-30 13F MICROSOFT COM 594918104 3,768,737 -20,028 -0.53 1,621,687 -4.23 4.7626
2024-08-12 2024-06-30 13F MICROSOFT COM 594918104 3,788,765 124,105 3.39 1,693,389 9.83 5.2231
2024-05-09 2024-03-31 13F MICROSOFT COM 594918104 3,664,660 234 0.01 1,541,796 11.89 4.8426
2024-02-12 2023-12-31 13F MICROSOFT COM 594918104 3,664,426 19,719 0.54 1,377,971 19.74 4.6955
2023-11-09 2023-09-30 13F MICROSOFT COM 594918104 3,644,707 -32,166 -0.87 1,150,816 -8.09 4.4134
2023-08-11 2023-06-30 13F MICROSOFT COM 594918104 3,676,873 9,116 0.25 1,252,122 18.41 4.5868
2023-05-12 2023-03-31 13F MICROSOFT COM 594918104 3,667,757 -14,368 -0.39 1,057,414 19.75 4.2239
2023-02-10 2022-12-31 13F MICROSOFT COM 594918104 3,682,125 -40,805 -1.10 883,047 1.84 3.8397
2022-11-09 2022-09-30 13F MICROSOFT COM 594918104 3,722,930 9,088 0.24 867,070 -9.10 3.9823
2022-08-10 2022-06-30 13F MICROSOFT COM 594918104 3,713,842 -40,784 -1.09 953,826 -17.60 4.2317
2022-05-13 2022-03-31 13F MICROSOFT COM 594918104 3,754,626 -52,821 -1.39 1,157,589 -9.60 4.0575
2022-02-14 2021-12-31 13F MICROSOFT COM 594918104 3,807,447 96,863 2.61 1,280,520 22.41 4.0163
2021-11-12 2021-09-30 13F MICROSOFT COM 594918104 3,710,584 41,534 1.13 1,046,088 5.25 3.5610
2021-08-12 2021-06-30 13F MICROSOFT COM 594918104 3,669,050 -2,234 -0.06 993,946 14.83 3.4443
2021-05-13 2021-03-31 13F MICROSOFT COM 594918104 3,671,284 -358,935 -8.91 865,579 -3.44 3.2654
2021-02-09 2020-12-31 13F MICROSOFT COM 594918104 4,030,219 55,503 1.40 896,401 7.22 3.2863
2020-11-06 2020-09-30 13F MICROSOFT COM 594918104 3,974,716 -903 -0.02 836,002 3.33 3.5459
2020-08-12 2020-06-30 13F MICROSOFT COM 594918104 3,975,619 96,872 2.50 809,078 32.26 3.8577
2020-05-11 2020-03-31 13F MICROSOFT COM 594918104 3,878,747 -190,207 -4.67 611,717 -4.67 3.8235
2020-02-13 2019-12-31 13F MICROSOFT COM 594918104 4,068,954 33,455 0.83 641,674 14.37 3.2981
2019-11-12 2019-09-30 13F MICROSOFT COM 594918104 4,035,499 -49,537 -1.21 561,055 2.53 3.2328
2019-08-13 2019-06-30 13F MICROSOFT COM 594918104 4,085,036 82,250 2.05 547,231 15.92 3.1290
2019-05-14 2019-03-31 13F MICROSOFT COM 594918104 4,002,786 106,176 2.72 472,089 19.28 2.8780
2019-02-14 2018-12-31 13F MICROSOFT COM 594918104 3,896,610 -4,508 -0.12 395,779 -11.29 2.8904
2018-11-13 2018-09-30 13F MICROSOFT COM 594918104 3,901,118 64,678 1.69 446,171 17.94 2.7337
2018-08-13 2018-06-30 13F MICROSOFT COM 594918104 3,836,440 190,295 5.22 378,311 13.68 2.5730
2018-05-15 2018-03-31 13F MICROSOFT COM 594918104 3,646,145 55,481 1.55 332,784 8.35 2.3533
2018-02-14 2017-12-31 13F MICROSOFT COM 594918104 3,590,664 49,177 1.39 307,145 16.43 2.0849
2017-11-13 2017-09-30 13F MICROSOFT COM 594918104 3,541,487 28,983 0.83 263,805 8.96 1.9783
2017-08-04 2017-06-30 13F MICROSOFT COM 594918104 3,512,504 264,647 8.15 242,117 14.07 1.8180
2017-05-10 2017-03-31 13F MICROSOFT COM 594918104 3,247,857 266,379 8.93 212,262 14.57 1.7107
2017-02-14 2016-12-31 13F MICROSOFT COM 594918104 2,981,478 143,977 5.07 185,269 13.36 1.6572
2016-11-14 2016-09-30 13F MICROSOFT COM 594918104 2,837,501 71,102 2.57 163,440 15.46 1.4447
2016-08-08 2016-06-30 13F MICROSOFT COM 594918104 2,766,399 269,291 10.78 141,557 2.64 1.3199
2016-05-16 2016-03-31 13F MICROSOFT COM 594918104 2,497,108 704,848 39.33 137,914 38.70 1.2983
2016-02-16 2015-12-31 13F MICROSOFT COM 594918104 1,792,260 137,473 8.31 99,434 35.76 0.9336
2015-11-12 2015-09-30 13F MICROSOFT COM 594918104 1,654,787 162,090 10.86 73,240 11.13 0.6336
2015-08-03 2015-06-30 13F MICROSOFT COM 594918104 1,492,697 -57,486 -3.71 65,902 4.57 0.0986
2015-05-11 2015-03-31 13F MICROSOFT COM 594918104 1,550,183 1,550,183 0.00 63,022 0.0970
2015-02-05 2014-12-31 13F MICROSOFT COM 594918104 0 -1,601,563 -100.00 0 -100.00
2014-11-04 2014-09-30 13F MICROSOFT COM 594918104 1,601,563 46,053 2.96 74,248 14.47 0.1270
2014-08-01 2014-06-30 13F MICROSOFT COM 594918104 1,555,510 41,229 2.72 64,865 4.50 0.1059
2014-05-06 2014-03-31 13F MICROSOFT COM 594918104 1,514,281 11,542 0.77 62,070 10.41 0.1027
2014-02-11 2013-12-31 13F MICROSOFT COM 594918104 1,502,739 -8,550 -0.57 56,217 11.77 0.0929
2013-11-12 2013-09-30 13F MICROSOFT COM 594918104 1,511,289 -226,067 -13.01 50,295 -16.20 0.0894
2013-08-07 2013-06-30 13F MICROSOFT COM 594918104 1,737,356 1,737,356 60,017 0.1187
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2017-11-13 2017-09-30 13F MICROSOFT OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-08-04 2017-06-30 13F MICROSOFT OPTION Call 2,700 12.50 186 17.72 n/a n/a n/a
2017-05-10 2017-03-31 13F MICROSOFT OPTION Call 2,400 -11.11 158 -5.39 n/a n/a n/a
2017-02-14 2016-12-31 13F MICROSOFT OPTION Call 2,700 167 n/a n/a n/a
2015-08-03 2015-06-30 13F January 16 Calls on MSFT US OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-05-11 2015-03-31 13F January 16 Calls on MSFT US OPTION Call 5,000 203 n/a n/a n/a
2014-11-04 2014-09-30 13F January 16 Calls on MSFT US OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2014-08-01 2014-06-30 13F January 16 Calls on MSFT US OPTION Call 170 205 n/a n/a n/a
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.