Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionDiamant Asset Management, Inc.
Latest Disclosed Ownership426,488 shares
Latest Disclosed Value $ 426,488
Diamant Asset Management, Inc. reports 30,582.59% increase in ownership of BRKB / Berkshire Hathaway Inc.

On April 22, 2026 - Diamant Asset Management, Inc. filed a 13F-HR form disclosing ownership of 426,488 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $426,488 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 1,390 shares of Berkshire Hathaway Inc.. This represents a change in shares of 30,582.59% 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)
2026-04-22 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 426,488 425,098 30,582.59 426 -38.97 0.3107
2026-02-06 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Com 084670702 1,390 -450 -24.46 699 -24.54 0.5051
2025-10-29 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B Comm 084670702 1,840 0 0.00 925 3.58 0.6814
2025-07-16 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 1,840 0 0.00 894 -8.78 0.6807
2025-05-15 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,840 0 0.00 980 17.39 0.7438
2025-01-22 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Com 084670702 1,840 0 0.00 834 -1.42 0.5334
2024-11-20 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,840 0 0.00 847 13.10 0.5307
2024-08-06 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Com 084670702 1,840 0 0.00 749 -3.23 0.5008
2024-04-24 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 1,840 -5 -0.27 774 17.48 0.5372
2024-02-13 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 1,845 0 0.00 658 1.86 0.4875
2023-11-08 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,845 0 0.00 646 2.70 0.5315
2023-07-21 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,845 0 0.00 629 10.54 0.4808
2023-05-16 2023-03-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B Com 084670702 1,845 0 0.00 570 0.00 0.4669
2023-05-15 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,845 0 570 0.5117
2023-02-08 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,845 0 0.00 570 15.42 0.5117
2022-10-21 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B COM 084670702 1,845 5 0.27 493 -1.79 0.4783
2022-08-02 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B Stock 084670702 1,840 0 0.00 502 -22.65 0.4518
2022-05-12 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,840 0 0.00 649 18.00 0.4971
2022-01-31 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,840 -5 -0.27 550 9.13 0.4020
2021-10-21 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,845 0 0.00 504 7.01 0.4167
2021-04-19 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,845 0 0.00 471 10.05 0.4137
2021-01-21 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,845 0 0.00 428 8.91 0.3808
2020-11-02 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,845 0 0.00 393 19.45 0.3778
2020-07-28 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,845 120 6.96 329 4.44 0.3464
2020-04-23 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,725 -650 -27.37 315 -41.45 0.4065
2020-02-04 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,375 0 0.00 538 8.91 0.4994
2019-10-31 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,375 -200 -7.77 494 -10.02 0.4950
2019-07-22 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 549 6.19 0.5433
2019-04-30 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 517 -1.71 0.5194
2019-01-30 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 526 -4.54 0.5902
2018-10-23 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 551 14.55 0.5105
2018-07-24 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 481 -6.42 0.4652
2018-05-07 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 0 0.00 514 0.78 0.5042
2018-02-13 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,575 2,575 510 0.0747
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.