Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionMain Street Research LLC
Latest Disclosed Ownership11,978 shares
Latest Disclosed Value $ 5,739,858
Main Street Research LLC reports 1.14% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On April 30, 2026 - Main Street Research LLC filed a 13F-HR form disclosing ownership of 11,978 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $5,739,858 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 12,116 shares of Berkshire Hathaway Inc.. This represents a change in shares of -1.14% 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)
2026-04-30 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 11,978 -138 -1.14 5,740 -5.76 0.3340
2026-02-09 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,116 -1,145 -8.63 6,090 -8.64 0.3484
2025-11-13 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,261 -102,920 -88.59 6,667 -88.19 0.3602
2025-08-05 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 116,181 4,761 4.27 56,437 -4.89 3.5131
2025-04-30 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 111,420 1,986 1.81 59,340 19.63 3.8774
2025-02-07 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 109,434 1,448 1.34 49,604 -0.20 3.0906
2024-11-12 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 107,986 1,252 1.17 49,702 14.47 3.1273
2024-07-29 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 106,734 2,746 2.64 43,419 -0.71 2.8639
2024-05-01 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 103,988 9,208 9.72 43,729 29.36 2.9729
2024-01-30 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 94,780 30,159 46.67 33,804 49.34 2.7144
2023-11-03 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 64,621 55,094 578.29 22,637 596.92 2.3322
2023-08-08 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,527 1,138 13.57 3,249 25.41 0.5178
2023-05-01 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,389 -3,156 -27.34 2,590 -27.37 0.5115
2023-02-06 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 11,545 -659 -5.40 3,566 9.42 0.8684
2022-11-14 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,204 4,136 51.26 3,259 47.93 0.7178
2022-08-12 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,068 -75,790 -90.38 2,203 -92.56 0.5776
2022-05-05 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 83,858 72,512 639.10 29,594 772.46 2.7814
2022-02-09 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 11,346 1,281 12.73 3,392 23.48 0.2619
2021-11-12 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,065 -987 -8.93 2,747 -10.58 0.2404
2021-08-06 2021-06-30 13F Berkshire Hathaway Inc Cl B COM 084670702 11,052 -52 -0.47 3,072 8.28 0.2466
2021-05-07 2021-03-31 13F Berkshire Hathaway Inc Cl B COM 084670702 11,104 -460 -3.98 2,837 5.82 0.2668
2021-02-12 2020-12-31 13F Berkshire Hathaway Inc Cl B COM 084670702 11,564 2,346 25.45 2,681 36.58 0.2884
2020-11-10 2020-09-30 13F Berkshire Hathaway Inc Cl B COM 084670702 9,218 -2,106 -18.60 1,963 -2.87 0.2500
2020-07-29 2020-06-30 13F Berkshire Hathaway Inc Cl B COM 084670702 11,324 2,732 31.80 2,021 28.64 0.3172
2020-05-01 2020-03-31 13F Berkshire Hathaway Inc Cl B COM 084670702 8,592 -2,272 -20.91 1,571 -36.16 0.3849
2020-01-28 2019-12-31 13F Berkshire Hathaway Inc Cl B COM 084670702 10,864 921 9.26 2,461 19.00 0.3881
2019-10-21 2019-09-30 13F Berkshire Hathaway Inc Cl B COM 084670702 9,943 -37,581 -79.08 2,068 -79.59 0.3879
2019-08-08 2019-06-30 13F Berkshire Hathaway Inc Cl B COM 084670702 47,524 4,842 11.34 10,131 18.16 2.2793
2019-05-13 2019-03-31 13F Berkshire Hathaway Inc Cl B COM 084670702 42,682 763 1.82 8,574 0.18 2.7255
2019-02-13 2018-12-31 13F Berkshire Hathaway Inc Cl B COM 084670702 41,919 29,714 243.46 8,559 227.55 3.3283
2018-11-05 2018-09-30 13F Berkshire Hathaway CL B COM 084670702 12,205 2,047 20.15 2,613 37.82 0.3752
2018-07-25 2018-06-30 13F Berkshire Hathaway CL B COM 084670702 10,158 2,052 25.31 1,896 17.25 0.2969
2018-05-08 2018-03-31 13F/A-1 Berkshire Hathaway CL B COM 084670702 8,106 -91 -1.11 1,617 -0.49 0.2559
2018-05-08 2018-03-31 13F Berkshire Hathaway CL B COM 084670702 8,197 0 1,625
2018-02-05 2017-12-31 13F Berkshire Hathaway CL B COM 084670702 8,197 656 8.70 1,625 17.58 0.2473
2017-10-16 2017-09-30 13F Berkshire Hathaway CL B COM 084670702 7,541 44 0.59 1,382 8.82 0.2230
2017-07-18 2017-06-30 13F Berkshire Hathaway CL B COM 084670702 7,497 1,305 21.08 1,270 23.06 0.2075
2017-05-04 2017-03-31 13F Berkshire Hathaway CL B COM 084670702 6,192 76 1.24 1,032 3.51 0.1807
2017-02-03 2016-12-31 13F Berkshire Hathaway CL B COM 084670702 6,116 -210 -3.32 997 9.08 0.1941
2016-11-10 2016-09-30 13F Berkshire Hathaway CL B COM 084670702 6,326 500 8.58 914 8.29 0.1786
2016-08-11 2016-06-30 13F Berkshire Hathaway CL B COM 084670702 5,826 3,126 115.78 844 120.37 0.1744
2016-05-13 2016-03-31 13F Berkshire Hathaway CL B COM 084670702 2,700 -1,539 -36.31 383 -31.61 0.0988
2016-02-04 2015-12-31 13F Berkshire Hathaway CL B COM 084670702 4,239 -910 -17.67 560 -20.00 0.1197
2015-11-12 2015-09-30 13F Berkshire Hathaway CL B COM 084670702 5,149 96 1.90 700 1.74 0.1642
2015-07-23 2015-06-30 13F Berkshire Hathaway CL B COM 084670702 5,053 186 3.82 688 -1.99 0.1409
2015-05-12 2015-03-31 13F Berkshire Hathaway CL B COM 084670702 4,867 912 23.06 702 18.18 0.1510
2015-02-09 2014-12-31 13F Berkshire Hathaway CL B COM 084670702 3,955 50 1.28 594 10.20 0.1272
2014-11-13 2014-09-30 13F Berkshire Hathaway CL B COM 084670702 3,905 0 0.00 539 9.11 0.1200
2014-08-11 2014-06-30 13F Berkshire Hathaway CL B COM 084670702 3,905 0 0.00 494 1.23 0.1165
2014-05-12 2014-03-31 13F Berkshire Hathaway CL B COM 084670702 3,905 0 0.00 488 5.40 0.1185
2014-02-06 2013-12-31 13F Berkshire Hathaway CL B COM 084670702 3,905 0 0.00 463 4.51 0.1156
2013-11-12 2013-09-30 13F Berkshire Hathaway CL B COM 084670702 3,905 0 0.00 443 1.37 0.1197
2013-08-01 2013-06-30 13F Berkshire Hathaway CL B COM 084670702 3,905 3,905 437 0.1320
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.