Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionTidemark, LLC
Latest Disclosed Ownership2,420 shares
Latest Disclosed Value $ 1,159,424
Tidemark, LLC reports 7.46% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 7, 2026 - Tidemark, LLC filed a 13F-HR form disclosing ownership of 2,420 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $1,159,424 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 2,252 shares of Berkshire Hathaway Inc.. This represents a change in shares of 7.46% 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)
2026-05-07 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 2,420 168 7.46 1,159 2.48 0.2947
2026-02-10 2025-12-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 2,252 -110 -4.66 1,132 -4.72 0.3216
2025-11-03 2025-09-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 2,362 154 6.97 1,187 10.73 0.3459
2025-08-11 2025-06-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 2,208 274 14.17 1,072 4.18 0.3456
2025-05-09 2025-03-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,934 159 8.96 1,030 27.99 0.3778
2025-02-10 2024-12-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,775 24 1.37 804 -0.12 0.3081
2024-11-07 2024-09-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,751 81 4.85 806 18.56 0.3306
2024-08-12 2024-06-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,670 82 5.16 679 1.80 0.3124
2024-05-13 2024-03-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,588 225 16.51 668 37.24 0.3725
2024-02-09 2023-12-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 1,363 1,363 486 0.3043
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.