Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionChelsea Counsel Co
Latest Disclosed Ownership849 shares
Latest Disclosed Value $ 406,841
Chelsea Counsel Co ownership in BRKB / Berkshire Hathaway Inc.

On June 4, 2026 - Chelsea Counsel Co filed a 13F-HR/A form disclosing ownership of 849 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $406,841 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 24, 2026 disclosing 2 shares of Berkshire Hathaway Inc.. This represents a change in shares of 0.00% 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)
2026-06-04 2026-03-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 849 0 0.00 407 -4.69 0.1792
2026-04-23 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 849 0 427 0.1818
2026-02-24 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 849 -40 -4.50 427 -4.48 0.1833
2025-11-25 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 889 0 0.00 447 3.48 0.1985
2025-07-18 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 889 0 0.00 432 -8.88 0.2141
2025-05-22 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 889 -50 -5.32 473 11.29 0.2574
2025-02-27 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 939 0 0.00 426 -1.62 0.2197
2024-11-21 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 939 0 0.00 432 13.39 0.2130
2024-11-21 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 939 -10 -1.05 382 -4.51 0.1906
2024-06-17 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 0 0.00 399 18.05 0.2263
2024-02-21 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 0 0.00 338 1.81 0.1795
2023-11-22 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 0 0.00 332 2.79 0.1710
2023-11-22 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 0 0.00 324 10.24 0.1593
2023-05-19 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 0 0.00 293 0.00 0.1423
2023-02-23 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 949 -100 -9.53 293 4.64 0.1464
2022-10-31 2022-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 1,049 -2,081 -66.49 280 -67.21 0.1727
2022-08-01 2022-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 854 -22.64 0.4387
2022-05-24 2022-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 1,104 17.95 0.4864
2022-05-23 2021-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 936 9.60 0.4052
2022-02-10 2021-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 854 -1.84 0.3883
2022-02-10 2021-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 870 8.75 0.4010
2022-02-10 2021-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 0 0.00 800 10.19 0.3966
2022-03-08 2020-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,130 -54 -1.70 726 7.08 0.3736
2022-05-06 2020-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,184 1,435 82.05 678 117.31 0.2723
2022-05-06 2020-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,184 678
2022-05-06 2020-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 1,749 -1,118 -39.00 312 -40.46 0.1195
2022-05-06 2020-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 3,858 688
2020-06-12 2020-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,867 1,118 63.92 524 32.32 0.4109
2020-03-23 2019-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 1,749 -500 -22.23 396 -15.38 0.2409
2020-03-27 2019-09-30 13F/A-1 BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 468 -2.30 0.2817
2019-12-09 2019-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 479 5.97 0.2564
2019-12-09 2019-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 -150 -6.25 452 -7.76 0.2436
2019-12-09 2018-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,399 150 6.67 490 1.66 0.2974
2019-12-09 2018-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 482 14.76 0.2512
2018-10-03 2018-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 420 -6.46 0.2500
2018-10-03 2018-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 449 0.67 0.2887
2018-01-12 2017-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 -150 -6.25 446 1.36 0.2382
2018-01-12 2017-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,399 0 0.00 440 8.37 0.2204
2018-01-22 2017-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,399 -4,940 -67.31 406 -66.80 0.2111
2017-04-20 2017-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 7,339 50 0.69 1,223 2.95 0.6284
2017-04-20 2016-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 7,289 5,040 224.10 1,188 265.54 0.6244
2016-11-01 2016-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 325 -0.31 0.1663
2016-11-01 2016-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 326 2.19 0.1473
2016-06-01 2016-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 319 7.41 0.1027
2016-04-07 2015-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 297 1.37 0.0896
2015-12-22 2015-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 293 -4.25 0.0698
2015-08-31 2015-06-30 13F/A-1 BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 285 0.0546
2015-09-10 2015-06-30 13F/A-2 BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 306 -5.85 0.0685
2015-08-28 2015-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 285
2015-05-29 2015-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 325 -3.85 0.0700
2015-05-29 2014-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 338 8.68 0.0696
2014-12-16 2014-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 311 9.12 0.0621
2014-09-04 2014-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 285 1.42 0.0556
2014-07-08 2014-03-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 0 0.00 281 5.24 0.0571
2014-03-24 2013-12-31 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 2,249 -2,600 -53.62 267 -51.45 0.0632
2013-11-14 2013-09-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 4,849 -1,391 -22.29 550 -21.20 0.1140
2013-11-14 2013-06-30 13F BERKSHIRE HATHAWAY CLASS B COMMON 084670702 6,240 6,240 698 0.1832
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.