Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership38,562 shares
Latest Disclosed Value $ 18,479,483
Vestmark Advisory Solutions, Inc. reports 54.46% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 38,562 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $18,479,483 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 24,966 shares of Berkshire Hathaway Inc.. This represents a change in shares of 54.46% 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)
2026-05-15 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 38,562 13,596 54.46 18,479 47.25 0.1270
2026-02-06 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,966 9,272 59.08 12,549 59.07 0.1694
2025-11-10 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 15,694 6,592 72.42 7,890 78.44 0.1504
2025-08-06 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,102 -12,064 -57.00 4,421 -60.78 0.0639
2025-05-13 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 21,166 11,129 110.88 11,273 147.79 0.2902
2025-02-06 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,037 169 1.71 4,550 0.18 0.1567
2024-11-14 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,868 300 3.14 4,542 16.68 0.1691
2024-08-12 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,568 261 2.80 3,892 -0.54 0.1625
2024-05-15 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,307 434 4.89 3,914 23.67 0.1686
2024-02-06 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,873 219 2.53 3,165 4.39 0.1608
2023-11-06 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,654 -8,479 -49.49 3,031 -48.12 0.2204
2023-08-07 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,133 22 0.13 5,842 10.58 0.2225
2023-05-09 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,111 58 0.34 5,283 0.30 0.2288
2023-01-20 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,053 5 0.03 5,268 15.71 0.2566
2022-11-03 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,048 3,265 23.69 4,552 20.97 0.2537
2022-08-04 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,783 5,498 66.36 3,763 28.69 0.2149
2022-04-27 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,285 507 6.52 2,924 25.71 0.1655
2022-01-31 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 7,778 103 1.34 2,326 11.03 0.1312
2021-11-15 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 7,675 -482 -5.91 2,095 -7.59 0.1419
2021-08-09 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,157 -306 -3.62 2,267 4.86 0.1613
2021-05-10 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,463 -1,954 -18.76 2,162 -10.48 0.1918
2021-02-04 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,417 363 3.61 2,415 12.80 0.2710
2020-10-19 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,054 583 6.16 2,141 26.61 0.2876
2020-08-13 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,471 228 2.47 1,691 0.06 0.2617
2020-05-06 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,243 9,243 1,690 0.3304
2020-02-14 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -9,445 -100.00 0 -100.00
2019-11-05 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,445 -439 -4.44 1,965 -6.74 0.3186
2019-08-20 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,884 -3 -0.03 2,107 6.09 0.3605
2019-05-14 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,887 9,887 1,986 0.3541
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.