Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionRafferty Asset Management, LLC
Latest Disclosed Ownership470,766 shares
Latest Disclosed Value $ 225,591,067
Rafferty Asset Management, LLC reports 19.08% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On May 15, 2026 - Rafferty Asset Management, LLC filed a 13F-HR form disclosing ownership of 470,766 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $225,591,067 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 581,790 shares of Berkshire Hathaway Inc.. This represents a change in shares of -19.08% 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)
2026-05-15 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 470,766 -111,024 -19.08 225,591 -22.86 0.9159
2026-02-13 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 581,790 -54,795 -8.61 292,437 -8.62 1.0103
2025-11-12 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 636,585 8,276 1.32 320,037 4.86 1.0380
2025-08-14 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 628,309 16,286 2.66 305,214 -6.36 1.0069
2025-05-14 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 612,023 -37,906 -5.83 325,951 10.64 1.3897
2025-02-14 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 649,929 28,864 4.65 294,600 3.06 1.0425
2024-11-13 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 621,065 -15,673 -2.46 285,851 10.36 0.9793
2024-08-13 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 636,738 -3,238 -0.51 259,025 -3.75 0.9615
2024-05-13 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 639,976 -4,924 -0.76 269,123 17.00 1.0040
2024-02-13 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 644,900 32,972 5.39 230,010 7.30 0.9699
2023-11-13 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 611,928 39,743 6.95 214,358 9.86 1.2599
2023-08-11 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 572,185 -35,033 -5.77 195,115 4.07 1.1000
2023-05-11 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 607,218 -86,609 -12.48 187,491 -12.52 1.2704
2023-02-13 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 693,827 73,988 11.94 214,323 29.49 1.7944
2022-11-14 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 619,839 210,976 51.60 165,509 48.27 1.7616
2022-08-12 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 408,863 -219,801 -34.96 111,628 -49.69 1.0272
2022-05-13 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 628,664 -340,346 -35.12 221,862 -23.43 1.3150
2022-02-10 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 969,010 76,282 8.54 289,734 18.91 1.5248
2021-11-10 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 892,728 -171,724 -16.13 243,661 -17.64 1.6648
2021-08-10 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 1,064,452 112,730 11.84 295,832 21.67 1.8630
2021-05-10 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 951,722 168,207 21.47 243,136 33.83 1.6612
2021-02-10 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 783,515 118,874 17.89 181,674 28.37 1.7754
2020-11-13 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 664,641 260,257 64.36 141,529 96.06 1.7115
2020-08-07 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 404,384 335,021 483.00 72,187 469.21 1.0171
2020-05-15 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 69,363 -251,408 -78.38 12,682 -82.54 0.5309
2020-02-10 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 320,771 25,557 8.66 72,655 18.31 1.1176
2019-11-14 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 295,214 -39,989 -11.93 61,410 -14.06 0.9604
2019-08-09 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 335,203 -56,352 -14.39 71,455 -9.16 1.2561
2019-05-15 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 391,555 54,552 16.19 78,659 14.31 1.2655
2019-02-11 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 337,003 -119,770 -26.22 68,809 -29.64 1.5009
2018-11-09 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 456,773 -51,717 -10.17 97,800 3.04 1.5155
2018-08-14 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 508,490 16,569 3.37 94,910 -3.28 1.4179
2018-05-15 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 491,921 70,924 16.85 98,128 17.59 1.4541
2018-02-14 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 420,997 98,985 30.74 83,450 41.37 1.4415
2017-11-13 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 322,012 36,096 12.62 59,031 21.90 1.3239
2017-08-11 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 285,916 -58,030 -16.87 48,426 -15.53 1.3900
2017-05-11 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 343,946 248,545 260.53 57,329 268.72 1.2634
2017-02-13 2016-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 95,401 -26,456 -21.71 15,548 -11.68 0.7122
2016-11-14 2016-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 121,857 -82,573 -40.39 17,605 -40.52 0.6429
2016-08-09 2016-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 204,430 -41,011 -16.71 29,599 -15.00 2.0017
2016-05-12 2016-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 245,441 80,876 49.15 34,823 58.79 1.8927
2016-02-12 2015-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 164,565 -12,810 -7.22 21,930 -5.19 2.6382
2015-11-12 2015-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 177,375 90,421 103.99 23,130 95.44 1.8267
2015-08-12 2015-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 86,954 -18,295 -17.38 11,835 -22.09 0.7946
2015-05-14 2015-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 105,249 50,941 93.80 15,190 86.29 1.1449
2015-02-13 2014-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 54,308 -11,237 -17.14 8,154 -9.94 1.8504
2014-11-14 2014-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 65,545 -23,761 -26.61 9,054 -19.90 0.9742
2014-08-13 2014-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 89,306 67,944 318.06 11,303 323.33 2.1742
2014-05-14 2014-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 21,362 -14,149 -39.84 2,670 -36.58 0.5527
2014-02-06 2013-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 35,511 -15,053 -29.77 4,210 -26.66 1.0066
2013-11-08 2013-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 50,564 -23,154 -31.41 5,740 -30.43 1.1084
2013-08-13 2013-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 73,718 73,718 8,251 1.1366
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.