Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionRK Asset Management, LLC
Latest Disclosed Ownership12,477 shares
Latest Disclosed Value $ 6,272
RK Asset Management, LLC reports 6.89% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On January 5, 2026 - RK Asset Management, LLC filed a 13F-HR form disclosing ownership of 12,477 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $6,272 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 14, 2025 disclosing 13,400 shares of Berkshire Hathaway Inc.. This represents a change in shares of -6.89% 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)
2026-01-05 2025-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 12,477 -923 -6.89 6 0.00 5.9169
2025-10-14 2025-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,400 37 0.28 7 0.00 6.1257
2025-07-18 2025-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,363 -19 -0.14 6 -14.29 6.2508
2025-04-02 2025-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,382 -471 -3.40 7 16.67 6.5792
2025-01-03 2024-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,853 -583 -4.04 6 0.00 5.1338
2024-10-07 2024-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,436 727 5.30 7 20.00 5.1087
2024-08-02 2024-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,709 -845 -5.81 6 -16.67 4.8166
2024-04-03 2024-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,554 -371 -2.49 6 20.00 4.9814
2024-01-09 2023-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,925 1,116 8.08 5 25.00 4.4174
2023-10-10 2023-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,809 -235 -1.67 5 0.00 4.5267
2023-07-06 2023-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,044 -540 -3.70 5 0.00 4.4327
2023-04-03 2023-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,584 -404 -2.70 5 0.00 4.4876
2023-01-03 2022-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,988 -7 -0.05 5 -99.92 4.4435
2022-04-11 2022-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,995 -1,136 -7.04 5,293 9.74 5.1332
2022-01-05 2021-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 16,131 -574 -3.44 4,823 5.79 4.2565
2021-10-04 2021-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 16,705 -275 -1.62 4,559 -3.39 4.0437
2021-07-07 2021-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 16,980 -88 -0.52 4,719 8.23 4.0786
2021-04-05 2021-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 17,068 -5,357 -23.89 4,360 -14.16 3.8915
2020-01-06 2019-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 22,425 -426 -1.86 5,079 6.86 4.7380
2019-10-10 2019-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 22,851 -729 -3.09 4,753 -5.45 4.6052
2019-07-01 2019-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 23,580 -100 -0.42 5,027 5.68 4.8255
2019-04-01 2019-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 23,680 -170 -0.71 4,757 -2.32 4.5653
2019-01-07 2018-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 23,850 -57 -0.24 4,870 -4.86 4.6849
2018-10-11 2018-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 23,907 -57 -0.24 5,119 14.44 4.5023
2018-07-03 2018-06-30 13F/A-1 BERKSHIRE HATHAWAY CL-B COM 084670702 23,964 10,840 82.60 4,473 70.86 4.0063
2018-07-02 2018-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 23,964 10,840 4,473
2018-04-09 2018-03-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 13,124 -1,868 -12.46 2,618 -11.91 2.5993
2018-01-04 2017-12-31 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,992 42 0.28 2,972 8.43 2.5082
2017-10-06 2017-09-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 14,950 -870 -5.50 2,741 2.31 2.3875
2017-07-07 2017-06-30 13F BERKSHIRE HATHAWAY CL-B COM 084670702 15,820 15,820 2,679 2.2478
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.