스트래티지 주식회사
MX ˙ BMV ˙ US5949724083
SecurityMX:MSTR / Strategy Inc
InstitutionSei Investments Co
Latest Disclosed Ownership58,788 shares
Latest Disclosed Value $ 8,929,997
Sei Investments Co ownership in MSTR / Strategy Inc

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 58,788 shares of Strategy Inc (MX:MSTR) valued at $8,929,997 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 45,414 shares of Strategy Inc. This represents a change in shares of 29.45% during the quarter.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (MSTR) 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.

MX:MSTR / Strategy Inc 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)
2026-02-13 2025-12-31 13F STRATEGY CL A NEW 594972408 58,788 13,374 29.45 8,930 -38.95 0.0088
2025-11-13 2025-09-30 13F STRATEGY CL A NEW 594972408 45,414 5,509 13.81 14,626 -9.29 0.0157
2025-08-14 2025-06-30 13F MICROSTRATEGY CL A NEW 594972408 39,905 14,296 55.82 16,125 118.36 0.0187
2025-05-14 2025-03-31 13F/A-1 MICROSTRATEGY CL A NEW 594972408 25,609 13,637 113.91 7,385 112.98 0.0095
2025-05-13 2025-03-31 13F MICROSTRATEGY CL A NEW 594972408 16,906 4,934 4,889 0.0053
2025-02-11 2024-12-31 13F MICROSTRATEGY CL A NEW 594972408 11,972 3,376 39.27 3,468 139.27 0.0045
2024-11-12 2024-09-30 13F MICROSTRATEGY CL A NEW 594972408 8,596 7,924 1,179.17 1,449 56.65 0.0019
2024-08-13 2024-06-30 13F MICROSTRATEGY CL A NEW 594972408 672 97 16.87 926 -5.61 0.0013
2024-05-07 2024-03-31 13F MICROSTRATEGY CL A NEW 594972408 575 153 36.26 980 268.42 0.0014
2024-02-14 2023-12-31 13F MICROSTRATEGY CL A NEW 594972408 422 422 267 0.0004
2022-05-13 2022-03-31 13F MICROSTRATEGY CL A NEW 594972408 0 -1,198 -100.00 0 -100.00
2022-02-14 2021-12-31 13F MICROSTRATEGY CL A NEW 594972408 1,198 651 119.01 652 106.33 0.0012
2021-11-12 2021-09-30 13F MICROSTRATEGY CL A NEW 594972408 547 7 1.30 316 -11.98 0.0007
2021-08-06 2021-06-30 13F MICROSTRATEGY CL A NEW 594972408 540 -4 -0.74 359 60.27 0.0008
2021-05-12 2021-03-31 13F MICROSTRATEGY CL A NEW 594972408 544 0 0.00 224 0.00 0.0006
2021-02-08 2020-12-31 13F MICROSTRATEGY CL A NEW 594972408 544 -6,775 -92.57 224 -79.03 0.0006
2020-12-04 2020-09-30 13F/A-1 MICROSTRATEGY CL A NEW 594972408 7,319 3,567 95.07 1,068 167.67 0.0031
2020-11-06 2020-09-30 13F MICROSTRATEGY CL A NEW 594972408 7,325 3,573 1,069 2,573.9143
2020-08-17 2020-06-30 13F/A-1 MICROSTRATEGY CL A NEW 594972408 3,752 3,752 399 0.0012
2020-08-11 2020-06-30 13F MICROSTRATEGY CL A NEW 594972408 3,752 3,752 399 1,082.3087
2019-08-14 2019-06-30 13F MICROSTRATEGY CL A NEW 594972408 0 -692 -100.00 0 -100.00
2019-05-15 2019-03-31 13F MICROSTRATEGY CL A NEW 594972408 692 -1,163 -62.70 66 -59.26 0.0002
2019-02-13 2018-12-31 13F MICROSTRATEGY CL A NEW 594972408 1,855 1,320 246.73 162 194.55 0.0006
2018-11-08 2018-09-30 13F MICROSTRATEGY CL A NEW 594972408 535 -204 -27.60 55 -42.11 0.0002
2018-08-03 2018-06-30 13F MICROSTRATEGY CL A NEW 594972408 739 716 3,113.04 95 3,066.67 0.0003
2018-05-11 2018-03-31 13F MICROSTRATEGY CL A NEW 594972408 23 23 3 0.0000
2017-11-06 2017-09-30 13F MICROSTRATEGY CL A NEW 594972408 0 -21,579 -100.00 0 -100.00
2017-07-31 2017-06-30 13F MICROSTRATEGY CL A NEW 594972408 21,579 2,578 13.57 4,136 15.92 0.0165
2017-05-05 2017-03-31 13F MICROSTRATEGY CL A NEW 594972408 19,001 920 5.09 3,568 -0.03 0.0156
2017-02-02 2016-12-31 13F MICROSTRATEGY CL A NEW 594972408 18,081 2,376 15.13 3,569 35.70 0.0173
2016-11-04 2016-09-30 13F MICROSTRATEGY CL A NEW 594972408 15,705 -482 -2.98 2,630 -7.17 0.0134
2016-08-11 2016-06-30 13F MICROSTRATEGY CL A NEW 594972408 16,187 503 3.21 2,833 0.50 0.0170
2016-05-10 2016-03-31 13F/A-1 MICROSTRATEGY CL A NEW 594972408 15,684 880 5.94 2,819 6.22 0.0175
2016-02-03 2015-12-31 13F MICROSTRATEGY CL A NEW 594972408 14,804 1,511 11.37 2,654 1.61 0.0162
2015-11-02 2015-09-30 13F/A-1 MICROSTRATEGY CL A NEW 594972408 13,293 2,061 18.35 2,612 36.75 0.0240
2015-10-30 2015-09-30 13F MICROSTRATEGY CL A NEW 594972408 13,293 2,612
2015-08-07 2015-06-30 13F/A-1 MICROSTRATEGY CL A NEW 594972408 11,232 320 2.93 1,910 3.47 0.0173
2015-08-04 2015-06-30 13F MICROSTRATEGY CL A NEW 594972408 11,232 320 1,910 0.0173
2015-05-14 2015-03-31 13F/A-1 MICROSTRATEGY CL A NEW 594972408 10,912 0 0.00 1,846 4.18 0.0160
2015-05-01 2015-03-31 13F MICHAELS COS PUT 594972408 10,912 10,912 1,846 0.0160
2015-02-10 2014-12-31 13F MICROSTRATEGY CL A NEW 594972408 10,912 10,912 1,772 0.0157
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
(%)
2015-05-01 2015-03-31 13F MICHAELS COS PUT 10,912 1,846 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.