Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionAssenagon Asset Management S.A.
Latest Disclosed Ownership2,307,666 shares
Latest Disclosed Value $ 1,105,833,547
Assenagon Asset Management S.A. reports 29.63% increase in ownership of BRKB / Berkshire Hathaway Inc.

On April 20, 2026 - Assenagon Asset Management S.A. filed a 13F-HR form disclosing ownership of 2,307,666 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $1,105,833,547 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 1,780,234 shares of Berkshire Hathaway Inc.. This represents a change in shares of 29.63% 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)
2026-04-20 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,307,666 527,432 29.63 1,105,834 23.58 1.6788
2026-01-09 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,780,234 -944,674 -34.67 894,835 -34.68 1.2319
2025-10-07 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,724,908 1,744,915 178.05 1,369,920 187.77 1.8734
2025-07-11 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 979,993 -514,980 -34.45 476,051 -40.21 0.7067
2025-04-15 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,494,973 -2,625,027 -63.71 796,193 -57.37 1.3281
2025-01-14 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,120,000 1,220,205 42.08 1,867,514 39.92 3.0120
2024-10-23 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,899,795 261,502 9.91 1,334,660 24.36 2.4563
2024-07-18 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,638,293 -231,983 -8.08 1,073,258 -11.08 2.3892
2024-04-24 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,870,276 230,742 8.74 1,207,008 28.21 2.8571
2024-01-17 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,639,534 -379,842 -12.58 941,416 -10.99 2.4987
2023-11-06 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,019,376 697,697 30.05 1,057,687 33.60 3.2744
2023-07-25 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,321,679 247,199 11.92 791,693 23.60 2.7388
2023-04-18 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,074,480 -131,310 -5.95 640,537 93,958.30 2.2736
2023-01-12 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,205,790 1,250,709 130.95 681 -99.73 2.4576
2022-10-27 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 955,081 -1,112,488 -53.81 255,026 -54.82 0.9789
2022-07-27 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,067,569 -45,236 -2.14 564,488 -24.29 2.0922
2022-04-25 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,112,805 -445,012 -17.40 745,630 -2.50 2.0715
2022-02-01 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 2,557,817 665,045 35.14 764,787 48.04 2.2155
2021-10-19 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,892,772 793,394 72.17 516,613 69.08 1.6521
2021-07-15 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,099,378 -860,609 -43.91 305,539 -38.98 1.0372
2021-04-26 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,959,987 708,445 56.61 500,718 72.55 2.0319
2021-02-01 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,251,542 202,547 19.31 290,195 29.91 1.2641
2020-10-07 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,048,995 207,342 24.64 223,373 48.67 1.2530
2020-07-21 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 841,653 718,937 585.85 150,243 569.65 0.9635
2020-04-17 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 122,716 -473,151 -79.41 22,436 -83.38 0.1795
2020-01-17 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 595,867 -711,864 -54.44 134,964 -50.39 0.8489
2019-10-16 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,307,731 435,728 49.97 272,034 46.35 1.8211
2019-08-12 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 872,003 -64,451 -6.88 185,885 -1.19 1.3962
2019-04-26 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 936,454 931,528 18,910.43 188,124 18,600.20 1.7650
2019-01-23 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4,926 -25,619 -83.87 1,006 -84.62 0.0114
2018-10-29 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 30,545 14,761 93.52 6,540 122.00 0.0646
2018-07-17 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 15,784 -178,624 -91.88 2,946 -92.40 0.0340
2018-04-30 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 194,408 190,515 4,893.78 38,781 4,923.45 0.5052
2018-01-25 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,893 -585,162 -99.34 772 -99.29 0.0079
2017-10-18 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 589,055 541,096 1,128.25 107,986 1,229.39 1.0028
2017-07-19 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 47,959 -388,380 -89.01 8,123 -88.83 0.1759
2017-05-04 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 436,339 436,339 72,729 1.5560
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.