Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionGM Advisory Group, Inc.
Latest Disclosed Ownership13,778 shares
Latest Disclosed Value $ 6,602,418
GM Advisory Group, Inc. reports 13.05% increase in ownership of BRKB / Berkshire Hathaway Inc.

On April 28, 2026 - GM Advisory Group, Inc. filed a 13F-HR form disclosing ownership of 13,778 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $6,602,418 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 12,187 shares of Berkshire Hathaway Inc.. This represents a change in shares of 13.05% 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)
2026-04-28 2026-03-31 13F Berkshire Hathaway Inc Del CL B Com 084670702 13,778 1,591 13.05 6,602 7.79 0.2442
2026-02-13 2025-12-31 13F Berkshire Hathaway Inc Del CL B CL B NEW 084670702 12,187 5,171 73.70 6,126 73.66 0.2400
2025-11-19 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 7,016 -322 -4.39 3,527 -1.04 0.1500
2025-08-13 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 7,338 1,575 27.33 3,565 16.13 0.1762
2025-05-14 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 5,763 56 0.98 3,069 18.68 0.1657
2025-02-11 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 5,707 1,370 31.59 2,587 29.56 0.1432
2024-11-12 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,337 333 8.32 1,996 22.60 0.1196
2024-08-12 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,004 35 0.88 1,629 -2.46 0.1051
2024-05-09 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,969 -239 -5.68 1,669 11.27 0.1170
2024-02-12 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,208 328 8.45 1,501 10.38 0.1133
2023-11-14 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,880 488 14.39 1,359 17.56 0.1111
2023-08-14 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,392 107 3.26 1,157 14.00 0.0957
2023-05-12 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,285 345 11.73 1,014 11.67 0.0924
2023-02-13 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,940 -4 -0.14 908 15.52 0.0969
2022-11-14 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,944 884 42.91 786 39.86 0.0989
2022-08-15 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,060 567 37.98 562 6.64 0.0877
2022-05-13 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,493 592 65.70 527 95.91 0.0627
2022-02-10 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 901 38 4.40 269 13.98 0.0240
2021-11-12 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 863 -150 -14.81 236 -16.31 0.0238
2021-08-16 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,013 1,013 282 0.0289
2021-02-12 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -1,098 -100.00 0 -100.00
2020-11-12 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,098 1,098 234 0.0358
2020-08-13 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -5,079 -100.00 0 -100.00
2020-05-13 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 5,079 5,079 929 0.2530
2020-02-14 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -1,191 -100.00 0 -100.00
2019-11-14 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,191 156 15.07 248 12.22 0.0771
2019-08-09 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,035 0 0.00 221 6.25 0.0694
2019-05-14 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,035 -420 -28.87 208 -29.97 0.0684
2019-02-13 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,455 22 1.54 297 -3.26 0.1105
2018-11-13 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,433 -1,100 -43.43 307 -35.10 0.0962
2018-08-14 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,533 103 4.24 473 -2.47 0.1405
2018-05-14 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,430 300 14.08 485 14.93 0.1464
2018-02-09 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,130 50 2.40 422 10.76 0.1148
2017-11-13 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,080 -94 -4.32 381 3.53 0.1160
2017-08-11 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,174 -750 -25.65 368 -24.44 0.1158
2017-05-12 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,924 100 3.54 487 5.87 0.1664
2017-02-13 2016-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,824 2,824 -3.42 460 -5.54 0.1607
2015-05-11 2015-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -2,469 -100.00 0 -100.00
2015-02-10 2014-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,469 0 0.00 371 8.80 0.2001
2014-11-10 2014-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,469 -47 -1.87 341 7.23 0.2556
2014-07-31 2014-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,516 47 1.90 318 3.92 0.2758
2014-05-08 2014-03-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,469 2,469 306 0.2374
2014-05-02 2014-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,469 306 0.2370
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.