Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionStonebrook Private Inc.
Latest Disclosed Ownership4,838 shares
Latest Disclosed Value $ 2,318,370
Stonebrook Private Inc. reports 23.29% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 11, 2026 - Stonebrook Private Inc. filed a 13F-HR form disclosing ownership of 4,838 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $2,318,370 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 3,924 shares of Berkshire Hathaway Inc.. This represents a change in shares of 23.29% 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)
2026-05-11 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,838 914 23.29 2,318 17.55 0.4937
2026-02-11 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,924 127 3.34 1,972 3.35 0.4129
2025-11-10 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,797 7 0.18 1,909 3.64 0.4124
2025-08-11 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,790 140 3.84 1,841 -5.25 0.4308
2025-04-30 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,650 237 6.94 1,944 25.60 0.5054
2025-02-14 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,413 170 5.24 1,547 3.69 0.4049
2024-11-12 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,243 283 9.56 1,493 23.92 0.3948
2024-08-06 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,960 189 6.82 1,204 3.35 0.3462
2024-05-07 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,771 640 30.03 1,165 53.29 0.3400
2024-02-13 2023-12-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,131 2,131 760 0.2539
2024-02-05 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,131 2,131 760 0.2539
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.