Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionCornerstone Advisors, LLC
Latest Disclosed Ownership26,950 shares
Latest Disclosed Value $ 12,914,440
Cornerstone Advisors, LLC reports 35.37% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On May 8, 2026 - Cornerstone Advisors, LLC filed a 13F-HR form disclosing ownership of 26,950 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $12,914,440 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 41,701 shares of Berkshire Hathaway Inc.. This represents a change in shares of -35.37% 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)
2026-05-08 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,950 -14,751 -35.37 12,914 -38.39 0.4751
2026-02-13 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 41,701 -47,099 -53.04 20,961 -53.05 0.6979
2025-11-07 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 88,800 0 0.00 44,643 3.49 1.4719
2025-08-08 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 88,800 6,300 7.64 43,136 -1.82 1.4818
2025-05-09 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 82,500 0 0.00 43,938 17.49 1.8927
2025-02-07 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 82,500 1,800 2.23 37,396 0.68 1.4905
2024-11-08 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 80,700 12,600 18.50 37,143 34.07 1.4685
2024-08-09 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 68,100 -3,300 -4.62 27,703 -7.73 1.1251
2024-05-10 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 71,400 -3,200 -4.29 30,025 12.85 1.2431
2024-02-09 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 74,600 -16,000 -17.66 26,607 -16.17 1.1706
2023-11-09 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 90,600 -61,100 -40.28 31,737 -38.65 1.4790
2023-08-11 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 151,700 -55,300 -26.71 51,730 -19.07 2.4682
2023-05-15 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 207,000 28,000 15.64 63,915 15.59 2.9651
2023-02-14 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 179,000 0 0.00 55,293 15.68 2.7297
2022-11-10 2022-09-30 13F BERKSHIRE HATHAWAY INC-B ETF 084670702 179,000 0 0.00 47,797 -2.20 2.3475
2022-08-12 2022-06-30 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 179,000 15,000 9.15 48,871 -15.56 2.5635
2022-05-12 2022-03-31 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 164,000 0 0.00 57,877 18.03 3.4099
2022-05-11 2021-12-31 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 164,000 0 0.00 49,036 9.55 2.6638
2021-11-12 2021-09-30 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 164,000 0 0.00 44,762 -1.79 2.5956
2021-08-13 2021-06-30 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 164,000 125,000 320.51 45,579 357.48 2.6899
2021-05-13 2021-03-31 13F BERKSHIRE HATHAWAY INC-B Common 084670702 39,000 -41,000 -51.25 9,963 -46.29 0.8726
2021-02-11 2020-12-31 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 80,000 -23,000 -22.33 18,550 -15.42 1.6278
2020-11-13 2020-09-30 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 103,000 -10,000 -8.85 21,933 8.73 1.9686
2020-08-11 2020-06-30 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 113,000 16,000 16.49 20,172 13.74 1.8825
2020-05-13 2020-03-31 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 97,000 0 0.00 17,735 -19.28 1.9586
2020-02-12 2019-12-31 13F BERKSHIRE HATHAWAY INC-B Common, Cl B 084670702 97,000 97,000 21,971 1.8093
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.