Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionIslay Capital Management, Llc
Latest Disclosed Ownership9,758 shares
Latest Disclosed Value $ 4,676,034
Islay Capital Management, Llc reports 0.78% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 14, 2026 - Islay Capital Management, Llc filed a 13F-HR form disclosing ownership of 9,758 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $4,676,034 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,682 shares of Berkshire Hathaway Inc.. This represents a change in shares of 0.78% 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)
2026-05-14 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,758 76 0.78 4,676 -3.90 2.3739
2026-02-13 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,682 -56 -0.58 4,867 -0.59 2.8610
2025-11-12 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,738 1,146 13.34 4,896 17.30 2.7994
2025-08-08 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,592 53 0.62 4,174 -8.23 2.6907
2025-05-14 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,539 -1,031 -10.77 4,548 4.84 3.0701
2025-02-13 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,570 -240 -2.45 4,338 -3.94 3.0118
2024-11-07 2024-09-30 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,810 0 0.00 4,515 13.16 3.0278
2024-11-07 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,810 0 4,515 3.0278
2024-08-13 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,810 21 0.21 3,991 -3.06 2.8694
2024-05-14 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,789 -23 -0.23 4,116 17.63 3.0642
2024-02-05 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,812 365 3.86 3,500 5.74 2.7027
2023-11-02 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,447 -100 -1.05 3,309 1.66 2.7713
2023-08-07 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,547 0 0.00 3,256 10.45 2.8704
2023-05-10 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,547 730 8.28 2,948 8.23 2.8791
2023-01-31 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,817 -65 -0.73 2,724 14.80 3.1225
2022-10-21 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,882 -148 -1.64 2,372 -3.77 2.8174
2022-08-08 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,030 -200 -2.17 2,465 -24.32 2.5681
2022-04-28 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,230 726 8.54 3,257 28.08 2.7104
2022-02-08 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,504 1,065 14.32 2,543 25.27 1.9227
2021-10-18 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 7,439 1,025 15.98 2,030 13.85 1.5624
2021-08-02 2021-06-30 13F Berkshire Hathaway COMMON 084670702 6,414 0 0.00 1,783 8.79 1.4426
2021-05-11 2021-03-31 13F Berkshire Hathaway COMMON 084670702 6,414 -300 -4.47 1,639 5.27 1.3519
2021-01-26 2020-12-31 13F Berkshire Hathaway COMMON 084670702 6,714 -467 -6.50 1,557 1.83 1.4052
2020-11-12 2020-09-30 13F Berkshire Hathaway COMMON 084670702 7,181 -577 -7.44 1,529 10.40 1.5751
2020-08-04 2020-06-30 13F Berkshire Hathaway COMMON 084670702 7,758 -200 -2.51 1,385 -4.81 1.6110
2020-05-06 2020-03-31 13F Berkshire Hathaway COMMON 084670702 7,958 2,041 34.49 1,455 8.58 1.9047
2020-02-11 2019-12-31 13F Berkshire Hathaway COMMON 084670702 5,917 5,917 1,340 1.2844
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.