Microsoft Corporation
MX ˙ BMV ˙ US5949181045
SecurityMX:MSFT / Microsoft Corporation
InstitutionMarex Group plc
Latest Disclosed Ownership424,687 shares
Latest Disclosed Value $ 157,206,387
Marex Group plc ownership in MSFT / Microsoft Corporation

On May 13, 2026 - Marex Group plc filed a 13F-HR form disclosing ownership of 424,687 shares of Microsoft Corporation (MX:MSFT) valued at $157,206,387 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 162,408 shares of Microsoft Corporation. This represents a change in shares of 161.49% during the quarter.

Marex Group plc 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 563,500 of underlying shares valued at $208,590,795 USD and put options representing 869,500 of underlying shares valued at $321,862,815 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)
2026-05-13 2026-03-31 13F MICROSOFT COM 594918104 424,687 262,279 161.49 157,206 100.15 0.6435
2026-02-12 2025-12-31 13F MICROSOFT COM 594918104 162,408 53,073 48.54 78,544 38.70 0.4944
2025-11-14 2025-09-30 13F MICROSOFT COM 594918104 109,335 66,135 153.09 56,630 163.55 0.4002
2025-08-19 2025-06-30 13F MICROSOFT COM 594918104 43,200 -202,779 -82.44 21,487 -76.73 0.1864
2026-04-02 2025-03-31 13F MICROSOFT COM 594918104 245,979 98,184 66.43 92,338 48.23 1.7694
2026-04-02 2024-12-31 13F MICROSOFT COM 594918104 147,795 22,713 18.16 62,296 15.74 1.0612
2026-04-07 2024-09-30 13F MICROSOFT COM 594918104 125,082 -53,727 -30.05 53,823 -32.65 1.2277
2026-04-02 2024-06-30 13F MICROSOFT COM 594918104 178,809 98,940 123.88 79,919 137.84 2.1457
2026-04-02 2024-03-31 13F MICROSOFT COM 594918104 79,869 7,075 9.72 33,602 22.76 1.0920
2026-04-02 2023-12-31 13F MICROSOFT COM 594918104 72,794 72,794 27,373 1.0759
2026-04-02 2023-09-30 13F MICROSOFT COM 594918104 0 -1,296 -100.00 0 -100.00
2026-04-02 2023-06-30 13F MICROSOFT COM 594918104 1,296 1,296 441 0.0796
2026-04-02 2023-03-31 13F MICROSOFT COM 594918104 0 -4,440 -100.00 0 -100.00
2026-04-02 2022-12-31 13F MICROSOFT COM 594918104 4,440 4,440 1,065 0.1513
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
(%)
2026-05-13 2026-03-31 13F MICROSOFT COM Call 563,500 58.33 208,591 21.19 n/a n/a n/a
2026-02-12 2025-12-31 13F MICROSOFT COM Call 355,900 -41.12 172,120 -45.02 n/a n/a n/a
2025-11-14 2025-09-30 13F MICROSOFT COM Call 604,400 197.29 313,049 209.57 n/a n/a n/a
2025-08-19 2025-06-30 13F MICROSOFT COM Call 203,300 101,123 n/a n/a n/a
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
(%)
2026-05-13 2026-03-31 13F MICROSOFT COM Put 869,500 68.34 321,863 28.85 n/a n/a n/a
2026-02-12 2025-12-31 13F MICROSOFT COM Put 516,500 -21.27 249,790 -26.48 n/a n/a n/a
2025-11-14 2025-09-30 13F MICROSOFT COM Put 656,000 218.45 339,775 231.60 n/a n/a n/a
2025-08-19 2025-06-30 13F MICROSOFT COM Put 206,000 102,466 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.