Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionFlagship Harbor Advisors, Llc
Latest Disclosed Ownership28,191 shares
Latest Disclosed Value $ 13,508,939
Flagship Harbor Advisors, Llc reports 0.65% increase in ownership of BRKB / Berkshire Hathaway Inc.

On April 28, 2026 - Flagship Harbor Advisors, Llc filed a 13F-HR form disclosing ownership of 28,191 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $13,508,939 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 28,010 shares of Berkshire Hathaway Inc.. This represents a change in shares of 0.65% 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)
2026-04-28 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 28,191 181 0.65 13,509 -4.06 0.5941
2026-01-21 2025-12-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 28,010 -109 -0.39 14,079 -0.40 0.6644
2025-11-05 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 28,119 -1,067 -3.66 14,136 -0.29 0.6150
2025-08-04 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 29,186 -2,801 -8.76 14,178 -16.78 0.6715
2025-04-22 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 31,987 13,287 71.05 17,036 100.98 0.8957
2025-01-21 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 18,700 1,327 7.64 8,476 6.02 0.4452
2024-10-21 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,373 -132 -0.75 7,996 12.29 0.4391
2025-12-02 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,505 1,840 11.75 7,121 8.09 0.4280
2024-04-16 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 15,665 -1,188 -7.05 6,587 9.60 0.4233
2024-01-10 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 16,853 3,425 25.51 6,011 27.79 0.4371
2023-10-17 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,428 -9 -0.07 4,704 2.64 0.3912
2023-07-11 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,437 265 2.01 4,582 12.66 0.3785
2023-04-12 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,172 -104 -0.78 4,067 -0.80 0.3831
2023-01-13 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,276 -202 -1.50 4,101 13.92 0.4204
2022-10-13 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,478 -106 -0.78 3,599 -2.97 0.4174
2022-07-13 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,584 413 3.14 3,709 -20.20 0.4166
2022-04-13 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,171 1,162 9.68 4,648 29.43 0.4479
2022-02-17 2021-12-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,009 60 0.50 3,591 8.13 0.3398
2022-02-10 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,009 60 3,591 0.3398
2021-11-01 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 11,949 0 0.00 3,321 0.00 0.3568
2021-07-26 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 11,949 -2,551 -17.59 3,321 -10.34 0.3562
2021-05-03 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 14,500 484 3.45 3,704 13.97 0.4205
2021-02-08 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 14,016 341 2.49 3,250 11.65 0.4030
2020-10-13 2020-09-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 13,675 -261 -1.87 2,911 17.05 0.3931
2020-07-31 2020-06-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 13,936 86 0.62 2,487 -1.78 0.3651
2020-05-12 2020-03-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 13,850 2,497 21.99 2,532 -1.52 0.5064
2020-02-14 2019-12-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 11,353 424 3.88 2,571 13.11 0.4502
2019-10-22 2019-09-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 10,929 413 3.93 2,273 1.43 0.4455
2019-07-22 2019-06-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 10,516 -192 -1.79 2,241 4.18 0.4651
2019-04-15 2019-03-31 13F BERKSHIRE HATHAWAY Common Stock 084670702 10,708 1,409 15.15 2,151 13.33 0.4418
2019-01-26 2018-12-31 13F BERKSHIRE HATHAWAY COM 084670702 9,299 252 2.79 1,898 -2.32 0.4613
2018-11-05 2018-09-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 9,047 251 2.85 1,943 18.40 0.3603
2018-08-14 2018-06-30 13F BERKSHIRE HATHAWAY Common Stock 084670702 8,796 -106 -1.19 1,641 -5.69 0.3284
2018-04-23 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,902 700 8.53 1,740 4.82 0.5173
2018-01-24 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,202 184 2.29 1,660 10.23 0.4772
2017-10-23 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,018 -45 -0.56 1,506 9.69 0.4886
2017-08-09 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,063 0 0.00 1,373 2.77 0.4767
2017-05-16 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 8,063 2,032 33.69 1,336 38.59 0.5104
2017-05-15 2016-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 6,031 6,031 964 0.4160
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.