Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionWorldquant Millennium Advisors Llc
Latest Disclosed Ownership332,672 shares
Latest Disclosed Value $ 159,416,422
Worldquant Millennium Advisors Llc reports 10.77% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 15, 2026 - Worldquant Millennium Advisors Llc filed a 13F-HR form disclosing ownership of 332,672 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $159,416,422 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 300,337 shares of Berkshire Hathaway Inc.. This represents a change in shares of 10.77% 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)
2026-05-15 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 332,672 32,335 10.77 159,416 5.60 0.6147
2026-02-17 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 300,337 176,707 142.93 150,964 142.89 0.5857
2025-11-14 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 123,630 -79,813 -39.23 62,154 -37.11 0.2685
2025-08-14 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 203,443 124,857 158.88 98,827 136.13 0.4909
2025-05-15 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 78,586 -114,753 -59.35 41,853 -52.24 0.2637
2025-02-14 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 193,339 -12,638 -6.14 87,637 -7.56 0.5675
2024-11-14 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 205,977 95,202 85.94 94,803 110.38 0.6937
2024-08-14 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 110,775 73,552 197.60 45,063 187.89 0.4109
2024-05-15 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 37,223 -12,646 -25.36 15,653 -11.99 0.1931
2024-02-14 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,869 -67,206 -57.40 17,786 -56.63 0.2489
2023-11-14 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 117,075 24,002 25.79 41,011 29.22 0.6332
2023-08-14 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 93,073 -40,506 -30.32 31,738 77,307.32 0.5373
2023-05-15 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 133,579 84,439 171.83 41 173.33 0.7634
2023-02-14 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,140 5,674 13.05 15 -99.87 0.3457
2022-11-14 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 43,466 -55,223 -55.96 11,606 -56.93 0.2820
2022-08-15 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 98,689 21,674 28.14 26,944 -0.86 0.7713
2022-05-16 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 77,015 -23,276 -23.21 27,179 -9.36 0.6624
2022-02-14 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 100,291 49,206 96.32 29,987 115.07 0.5960
2021-11-15 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 51,085 2,530 5.21 13,943 3.33 0.3050
2021-08-16 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 48,555 -1,337 -2.68 13,494 5.87 0.2982
2021-05-17 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,892 0 0.00 12,746 10.18 0.2706
2021-02-16 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,892 0 0.00 11,568 8.89 0.2529
2020-11-16 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,892 -35,111 -41.31 10,624 -29.99 0.2517
2020-08-14 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 85,003 -12,916 -13.19 15,174 -15.24 0.3492
2020-05-14 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 97,919 -6,284 -6.03 17,903 -24.15 0.4354
2020-02-14 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 104,203 -6,174 -5.59 23,602 2.80 0.4518
2019-11-14 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 110,377 -297 -0.27 22,960 -2.68 0.4464
2019-08-14 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 110,674 18,093 19.54 23,592 26.85 0.4493
2019-05-14 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 92,581 17,923 24.01 18,599 22.01 0.4411
2019-02-14 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 74,658 23,737 46.62 15,244 39.81 0.4512
2018-11-14 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 50,921 1,828 3.72 10,903 18.99 0.3653
2018-08-14 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 49,093 49,093 9,163 0.3514
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.