Microsoft Corporation
BG ˙ BUL ˙ US5949181045
SecurityBG:MSF / Microsoft Corporation
InstitutionGuardian Capital Lp
Latest Disclosed Ownership175,523 shares
Latest Disclosed Value $ 64,973,349
Guardian Capital Lp ownership in MSF / Microsoft Corporation

On May 15, 2026 - Guardian Capital Lp filed a 13F-HR form disclosing ownership of 175,523 shares of Microsoft Corporation (BG:MSF) valued at $64,973,349 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 146,530 shares of Microsoft Corporation. This represents a change in shares of 19.79% during the quarter.

Guardian Capital Lp has a history of taking positions in derivatives of the underlying security (MSF) in the form of stock options.

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.

BG:MSF / 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)
2026-05-15 2026-03-31 13F MICROSOFT COM 594918104 175,523 28,993 19.79 64,973 -8.31 1.1326
2026-02-18 2025-12-31 13F MICROSOFT COM 594918104 146,530 -6,820 -4.45 70,865 -10.78 2.1014
2025-11-12 2025-09-30 13F MICROSOFT COM 594918104 153,350 12,338 8.75 79,428 13.24 2.5641
2025-08-07 2025-06-30 13F MICROSOFT COM 594918104 141,012 2,959 2.14 70,141 35.35 2.4782
2025-05-14 2025-03-31 13F MICROSOFT COM 594918104 138,053 172 0.12 51,824 -10.83 2.0383
2025-02-14 2024-12-31 13F MICROSOFT COM 594918104 137,881 1,375 1.01 58,117 -1.06 2.1600
2024-11-12 2024-09-30 13F MICROSOFT COM 594918104 136,506 -270 -0.20 58,739 -3.92 2.1511
2024-08-13 2024-06-30 13F MICROSOFT COM 594918104 136,776 2,691 2.01 61,132 8.37 2.3051
2024-05-14 2024-03-31 13F MICROSOFT COM 594918104 134,085 130 0.10 56,412 11.99 1.9662
2024-02-08 2023-12-31 13F MICROSOFT COM 594918104 133,955 -5,022 -3.61 50,372 14.79 1.8051
2023-11-13 2023-09-30 13F MICROSOFT COM 594918104 138,977 -15,136 -9.82 43,882 -16.39 1.6331
2023-08-14 2023-06-30 13F MICROSOFT COM 594918104 154,113 -15,043 -8.89 52,482 7.62 1.6803
2023-05-15 2023-03-31 13F MICROSOFT COM 594918104 169,156 -2,615 -1.52 48,768 18.38 1.5545
2023-02-14 2022-12-31 13F MICROSOFT COM 594918104 171,771 103 0.06 41,194 3.03 1.3563
2022-11-14 2022-09-30 13F MICROSOFT COM 594918104 171,668 -1,509 -0.87 39,981 -10.11 1.3748
2022-08-12 2022-06-30 13F MICROSOFT COM 594918104 173,177 4,662 2.77 44,477 -14.39 1.3604
2022-05-16 2022-03-31 13F MICROSOFT COM 594918104 168,515 1,094 0.65 51,955 -7.73 1.0099
2022-02-10 2021-12-31 13F MICROSOFT COM 594918104 167,421 -4,306 -2.51 56,307 16.31 1.0866
2021-11-15 2021-09-30 13F MICROSOFT COM 594918104 171,727 -3,003 -1.72 48,413 2.28 1.0017
2021-08-17 2021-06-30 13F MICROSOFT COM 594918104 174,730 4,086 2.39 47,334 17.65 0.9283
2021-05-17 2021-03-31 13F MICROSOFT COM 594918104 170,644 251 0.15 40,233 6.16 0.6742
2021-02-12 2020-12-31 13F MICROSOFT COM 594918104 170,393 639 0.38 37,899 6.15 0.8840
2020-11-16 2020-09-30 13F MICROSOFT COM 594918104 169,754 -8,696 -4.87 35,704 -1.69 0.9383
2020-08-13 2020-06-30 13F MICROSOFT COM 594918104 178,450 -11,342 -5.98 36,316 21.33 0.9396
2020-05-15 2020-03-31 13F MICROSOFT COM 594918104 189,792 -27,762 -12.76 29,932 -12.76 0.8912
2020-02-13 2019-12-31 13F MICROSOFT COM 594918104 217,554 -65,363 -23.10 34,308 -12.78 0.7134
2019-11-14 2019-09-30 13F MICROSOFT COM 594918104 282,917 26,805 10.47 39,334 14.65 0.7885
2019-08-14 2019-06-30 13F MICROSOFT COM 594918104 256,112 1,501 0.59 34,309 14.25 0.6676
2019-05-15 2019-03-31 13F MICROSOFT COM 594918104 254,611 33,329 15.06 30,029 33.60 0.5531
2019-02-13 2018-12-31 13F MICROSOFT COM 594918104 221,282 -75,476 -25.43 22,476 -33.78 0.4695
2018-11-13 2018-09-30 13F MICROSOFT COM 594918104 296,758 -3,079 -1.03 33,940 14.79 0.5692
2018-08-14 2018-06-30 13F MICROSOFT COM 594918104 299,837 17,956 6.37 29,567 14.93 0.5001
2018-05-14 2018-03-31 13F MICROSOFT COM 594918104 281,881 5,718 2.07 25,727 8.91 0.4441
2018-02-14 2017-12-31 13F MICROSOFT COM 594918104 276,163 -3,511 -1.26 23,623 13.39 0.3483
2017-11-15 2017-09-30 13F MICROSOFT COM 594918104 279,674 -1,067 -0.38 20,833 7.66 0.3080
2017-08-14 2017-06-30 13F MICROSOFT COM 594918104 280,741 -4,243 -1.49 19,351 3.10 0.3023
2017-05-15 2017-03-31 13F MICROSOFT COM 594918104 284,984 -2,408 -0.84 18,769 5.10 0.2858
2017-02-14 2016-12-31 13F MICROSOFT COM 594918104 287,392 46,238 19.17 17,859 28.57 0.2637
2016-11-14 2016-09-30 13F MICROSOFT COM 594918104 241,154 -1,100 -0.45 13,890 12.05 0.2180
2016-08-12 2016-06-30 13F MICROSOFT COM 594918104 242,254 5,790 2.45 12,396 -5.08 0.2025
2016-05-12 2016-03-31 13F MICROSOFT COM 594918104 236,464 43,615 22.62 13,060 22.07 0.2204
2016-02-12 2015-12-31 13F MICROSOFT COM 594918104 192,849 77,385 67.02 10,699 109.37 0.2055
2015-11-12 2015-09-30 13F MICROSOFT COM 594918104 115,464 -143,058 -55.34 5,110 -55.23 0.0971
2015-08-13 2015-06-30 13F MICROSOFT COM 594918104 258,522 28,383 12.33 11,414 21.98 0.1936
2015-05-14 2015-03-31 13F MICROSOFT COM 594918104 230,139 2,976 1.31 9,357 -11.32 0.1592
2015-02-13 2014-12-31 13F MICROSOFT COM 594918104 227,163 7,129 3.24 10,552 3.44 0.1685
2014-11-12 2014-09-30 13F MICROSOFT COM 594918104 220,034 1,092 0.50 10,201 11.73 0.1532
2014-08-14 2014-06-30 13F MICROSOFT COM 594918104 218,942 -3,602 -1.62 9,130 0.09 0.1321
2014-05-14 2014-03-31 13F MICROSOFT COM 594918104 222,544 222,544 9,122 0.1416
Disclosed Put 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
(%)
2026-05-15 2026-03-31 13F MICROSOFT PUT Put 2,800 -24.32 209 20.81 n/a n/a n/a
2026-02-18 2025-12-31 13F MICROSOFT PUT Put 3,700 -9.76 173 61.68 n/a n/a n/a
2025-11-12 2025-09-30 13F MICROSOFT PUT Put 4,100 0.00 108 11.46 n/a n/a n/a
2025-08-07 2025-06-30 13F MICROSOFT PUT Put 4,100 0.00 96 -65.34 n/a n/a n/a
2025-05-14 2025-03-31 13F MICROSOFT PUT Put 4,100 0.00 278 118.11 n/a n/a n/a
2025-02-14 2024-12-31 13F MICROSOFT PUT Put 4,100 128 n/a n/a n/a
2023-05-15 2023-03-31 13F MICROSOFT COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F MICROSOFT COM Put 133 0.76 381 -34.93 n/a n/a n/a
2022-11-14 2022-09-30 13F MICROSOFT COM Put 132 -1.49 584 10.82 n/a n/a n/a
2022-08-12 2022-06-30 13F MICROSOFT COM Put 134 527 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.