Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionConcentrum Wealth Management
Latest Disclosed Ownership1,128 shares
Latest Disclosed Value $ 540,577
Concentrum Wealth Management reports 93.79% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On May 4, 2026 - Concentrum Wealth Management filed a 13F-HR form disclosing ownership of 1,128 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $540,577 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 18,166 shares of Berkshire Hathaway Inc.. This represents a change in shares of -93.79% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-04 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 1,128 -17,038 -93.79 541 -94.09 0.1596
2026-02-04 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 18,166 1,881 11.55 9,131 11.53 2.5499
2025-11-10 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 16,285 1,286 8.57 8,187 12.37 2.3620
2025-08-12 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 14,999 2,531 20.30 7,286 9.73 2.2859
2025-05-07 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 12,468 1,204 10.69 6,640 30.07 2.4612
2025-02-13 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 11,264 1,660 17.28 5,106 15.50 1.7959
2024-11-13 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 9,604 2,172 29.22 4,420 46.21 1.7202
2024-08-13 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 7,432 1,696 29.57 3,023 25.38 1.2718
2024-05-06 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 5,736 1,548 36.96 2,412 61.49 1.1140
2024-02-13 2023-12-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 4,188 1,733 70.59 1,494 73.81 0.7799
2024-02-06 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 4,188 1,733 1,494 0.7808
2023-11-08 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 2,455 185 8.15 860 10.98 0.5201
2023-08-08 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 2,270 -896 -28.30 774 -20.78 0.4951
2023-05-03 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 3,166 -200 -5.94 978 -5.97 0.7251
2023-02-06 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 3,366 388 13.03 1,040 30.69 0.9295
2022-11-10 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 2,978 535 21.90 795 19.19 0.6928
2022-07-28 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 2,443 1,259 106.33 667 59.57 0.5473
2022-05-06 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,184 500 73.10 418 103.90 0.2602
2022-02-02 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 684 684 205 0.1069
2021-04-29 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 0 -945 -100.00 0 -100.00
2021-01-20 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 945 -30 -3.08 219 5.29 0.1729
2020-10-23 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 975 -188 -16.17 208 0.00 0.1986
2020-08-06 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,163 -156 -11.83 208 -13.69 0.2110
2020-05-04 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,319 3 0.23 241 -19.13 0.3238
2020-01-15 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,316 2 0.15 298 9.16 0.3355
2019-10-31 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,314 -600 -31.35 273 -33.09 0.3449
2019-07-22 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,914 600 45.66 408 54.55 0.4887
2019-05-08 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,314 116 9.68 264 7.76 0.3482
2019-02-07 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,198 1,198 245 0.4177
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.