Micron Technology, Inc.
MX ˙ BMV ˙ LU1650489385
SecurityMX:MU / Micron Technology, Inc.
InstitutionFactory Mutual Insurance Co
Latest Disclosed Ownership170,845 shares
Latest Disclosed Value $ 57,718,275
Factory Mutual Insurance Co reports 12.14% increase in ownership of MU / Micron Technology, Inc.

On May 5, 2026 - Factory Mutual Insurance Co filed a 13F-HR form disclosing ownership of 170,845 shares of Micron Technology, Inc. (MX:MU) valued at $57,718,275 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 152,345 shares of Micron Technology, Inc.. This represents a change in shares of 12.14% during the quarter.

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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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)
2026-05-05 2026-03-31 13F MICRON TECHNOLOGY COM 595112103 170,845 18,500 12.14 57,718 32.75 0.6493
2026-01-23 2025-12-31 13F MICRON TECHNOLOGY COM 595112103 152,345 20,600 15.64 43,481 97.25 0.4408
2025-11-10 2025-09-30 13F MICRON TECHNOLOGY COM 595112103 131,745 0 0.00 22,044 35.76 0.2147
2025-08-07 2025-06-30 13F MICRON TECHNOLOGY COM 595112103 131,745 0 0.00 16,238 41.85 0.1775
2025-04-17 2025-03-31 13F MICRON TECHNOLOGY COM 595112103 131,745 0 0.00 11,447 3.25 0.1328
2025-01-24 2024-12-31 13F MICRON TECHNOLOGY COM 595112103 131,745 46,000 53.65 11,088 24.69 0.1199
2024-10-10 2024-09-30 13F MICRON TECHNOLOGY COM 595112103 85,745 56,495 193.15 8,893 131.14 0.0920
2024-07-23 2024-06-30 13F MICRON TECHNOLOGY COM 595112103 29,250 29,250 3,847 0.0438
2018-01-16 2017-12-31 13F MICRON TECHNOLOGY COM 595112103 0 -50,000 -100.00 0 -100.00
2017-10-11 2017-09-30 13F MICRON TECHNOLOGY COM 595112103 50,000 -312,000 -86.19 1,967 -81.80 0.0216
2017-07-10 2017-06-30 13F MICRON TECHNOLOGY COM 595112103 362,000 -398,000 -52.37 10,809 -50.79 0.1250
2017-04-21 2017-03-31 13F MICRON TECHNOLOGY COM 595112103 760,000 -170,000 -18.28 21,964 5.48 0.2602
2017-01-19 2016-12-31 13F MICRON TECHNOLOGY COM 595112103 930,000 -130,000 -12.26 20,823 10.48 0.2471
2016-10-26 2016-09-30 13F MICRON TECHNOLOGY COM 595112103 1,060,000 -745,000 -41.27 18,847 -24.12 0.2331
2016-07-12 2016-06-30 13F MICRON TECHNOLOGY COM 595112103 1,805,000 -470,000 -20.66 24,837 4.27 0.3272
2016-04-27 2016-03-31 13F MICRON TECHNOLOGY COM 595112103 2,275,000 120,000 5.57 23,819 -21.94 0.3082
2016-01-14 2015-12-31 13F MICRON TECHNOLOGY COM 595112103 2,155,000 80,000 3.86 30,515 -1.83 0.4105
2015-10-14 2015-09-30 13F MICRON TECHNOLOGY COM 595112103 2,075,000 50,000 2.47 31,083 -18.53 0.4252
2015-07-21 2015-06-30 13F MICRON TECHNOLOGY COM 595112103 2,025,000 346,000 20.61 38,151 -16.24 0.4983
2015-04-13 2015-03-31 13F MICRON TECHNOLOGY COM 595112103 1,679,000 638,000 61.29 45,549 24.98 0.6001
2015-01-12 2014-12-31 13F MICRON TECHNOLOGY COM 595112103 1,041,000 61,500 6.28 36,445 8.60 0.4911
2014-11-04 2014-09-30 13F MICRON TECHNOLOGY COM 595112103 979,500 68,500 7.52 33,558 11.80 0.4641
2014-08-12 2014-06-30 13F MICRON TECHNOLOGY COM 595112103 911,000 11,000 1.22 30,017 40.96 0.4104
2014-05-15 2014-03-31 13F MICRON TECHNOLOGY COM 595112103 900,000 -50,000 -5.26 21,294 3.05 0.3083
2014-02-04 2013-12-31 13F MICRON TECHNOLOGY COM 595112103 950,000 0 0.00 20,663 24.51 0.3039
2013-10-16 2013-09-30 13F MICRON TECHNOLOGY COM 595112103 950,000 950,000 16,596 0.2632
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.