Microsoft Corporation
BG ˙ BUL ˙ US5949181045
SecurityBG:MSF / Microsoft Corporation
InstitutionCastellan Group, LLC
Latest Disclosed Ownership6,200 shares
Latest Disclosed Value $ 2,295,054
Castellan Group, LLC ownership in MSF / Microsoft Corporation

On April 23, 2026 - Castellan Group, LLC filed a 13F-HR form disclosing ownership of 6,200 shares of Microsoft Corporation (BG:MSF) valued at $2,295,054 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 17,119 shares of Microsoft Corporation. This represents a change in shares of -63.78% during the quarter.

Castellan Group, LLC has a history of taking positions in derivatives of the underlying security (MSF) 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.

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)
2026-04-23 2026-03-31 13F MICROSOFT COM 594918104 6,200 -10,919 -63.78 2,295 -72.28 0.3163
2026-01-23 2025-12-31 13F MICROSOFT COM 594918104 17,119 13,919 434.97 8,279 399.64 1.0412
2025-10-23 2025-09-30 13F MICROSOFT COM 594918104 3,200 0 0.00 1,657 4.15 0.2401
2025-08-12 2025-06-30 13F/A-1 MICROSOFT COM 594918104 3,200 -35,367 -91.70 1,592 -89.01 0.2932
2025-07-24 2025-06-30 13F MICROSOFT COM 594918104 3,200 -35,367 1,592 0.2932
2025-05-08 2025-03-31 13F MICROSOFT COM 594918104 38,567 18,203 89.39 14,478 68.67 4.0485
2025-01-29 2024-12-31 13F MICROSOFT COM 594918104 20,364 -790 -3.73 8,583 -5.70 3.7192
2024-11-25 2024-09-30 13F MICROSOFT COM 594918104 21,154 1,052 5.23 9,103 1.31 3.8373
2024-08-12 2024-06-30 13F MICROSOFT COM 594918104 20,102 2,438 13.80 8,985 20.90 4.2771
2024-05-15 2024-03-31 13F MICROSOFT COM 594918104 17,664 2,414 15.83 7,432 29.60 3.8047
2024-02-14 2023-12-31 13F MICROSOFT COM 594918104 15,250 -138 -0.90 5,735 18.03 3.5617
2023-11-15 2023-09-30 13F MICROSOFT COM 594918104 15,388 -821 -5.07 4,859 -11.98 3.4143
2023-08-14 2023-06-30 13F MICROSOFT COM 594918104 16,209 -1,119 -6.46 5,520 10.49 3.5280
2023-05-17 2023-03-31 13F MICROSOFT COM 594918104 17,328 -590 -3.29 4,996 16.24 3.4125
2023-02-16 2022-12-31 13F MICROSOFT COM 594918104 17,918 100 0.56 4,297 3.54 2.9950
2022-11-15 2022-09-30 13F MICROSOFT COM 594918104 17,818 232 1.32 4,150 -8.12 3.2256
2022-08-15 2022-06-30 13F/A-1 MICROSOFT COM 594918104 17,586 -1,053 -5.65 4,517 -21.40 3.5792
2022-08-15 2022-06-30 13F MICROSOFT COM 594918104 18,639 5,747
2022-05-23 2022-03-31 13F MICROSOFT COM 594918104 18,639 5,606 43.01 5,747 31.12 3.9860
2022-02-16 2021-12-31 13F MICROSOFT COM 594918104 13,033 8,083 163.29 4,383 213.97 3.0364
2021-11-15 2021-09-30 13F MICROSOFT COM 594918104 4,950 3,150 175.00 1,396 186.07 0.7187
2021-08-16 2021-06-30 13F MICROSOFT COM 594918104 1,800 0 0.00 488 15.09 0.2047
2021-05-14 2021-03-31 13F MICROSOFT COM 594918104 1,800 0 0.00 424 6.00 0.2266
2021-02-16 2020-12-31 13F MICROSOFT COM 594918104 1,800 1,800 400 0.4322
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
(%)
2026-01-23 2025-12-31 13F MICROSOFT CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-10-23 2025-09-30 13F MICROSOFT CALL Call 32 237 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.