Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionBanco Santander, S.A.
Latest Disclosed Ownership90,295 shares
Latest Disclosed Value $ 43,269,365
Banco Santander, S.A. reports 8.91% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 8, 2026 - Banco Santander, S.A. filed a 13F-HR form disclosing ownership of 90,295 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $43,269,365 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 82,906 shares of Berkshire Hathaway Inc.. This represents a change in shares of 8.91% 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)
2026-05-08 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 90,295 7,389 8.91 43,269 3.83 0.2045
2026-02-13 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 82,906 396 0.48 41,673 0.46 0.3120
2025-11-12 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 82,510 6,763 8.93 41,481 12.74 0.3683
2025-08-01 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 75,747 21,735 40.24 36,796 27.92 0.3494
2025-05-09 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 54,012 17,686 48.69 28,766 74.70 0.3174
2025-02-07 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 36,326 -2,046 -5.33 16,466 -6.77 0.1981
2024-11-12 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 38,372 -4,658 -10.83 17,661 0.90 0.2082
2024-07-29 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 43,030 -3,829 -8.17 17,505 -11.17 0.2169
2024-05-10 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 46,859 915 1.99 19,705 20.26 0.2375
2024-02-09 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 45,944 154 0.34 16,386 2.16 0.1936
2023-11-08 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 45,790 17,741 63.25 16,040 67.71 0.2274
2023-08-14 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 28,049 6,002 27.22 9,565 40.50 0.1255
2023-05-10 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 22,047 -4,509 -16.98 6,807 -17.02 0.1019
2023-02-13 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,556 -2,273 -7.88 8,203 6.56 0.1232
2022-11-08 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 28,829 6 0.02 7,698 -2.17 0.1027
2022-07-28 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 28,823 -26,359 -47.77 7,869 -59.59 0.1049
2022-05-09 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 55,182 28,678 108.20 19,474 145.73 0.2090
2022-02-09 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,504 2,419 10.04 7,925 20.55 0.0427
2021-11-08 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,085 -808 -3.25 6,574 -4.97 0.0353
2021-07-29 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,893 6,675 36.64 6,918 48.61 0.0386
2021-05-10 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 18,218 16 0.09 4,655 10.28 0.0328
2021-02-12 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 18,202 -23,413 -56.26 4,221 -52.37 0.0303
2020-11-09 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 41,615 23,624 131.31 8,862 175.99 0.1165
2020-08-05 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 17,991 -15,195 -45.79 3,211 -47.08 0.0416
2020-05-11 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 33,186 10,828 48.43 6,068 19.83 0.0695
2020-02-07 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 22,358 273 1.24 5,064 10.23 0.0468
2019-11-06 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 22,085 -7,455 -25.24 4,594 -27.04 0.0447
2019-08-07 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 29,540 5,673 23.77 6,297 31.35 0.0639
2019-05-13 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,867 901 3.92 4,794 2.24 0.0541
2019-02-12 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 22,966 6,203 37.00 4,689 30.65 0.0593
2018-11-13 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 16,763 -13,048 -43.77 3,589 -35.50 0.0410
2018-08-14 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 29,811 10,840 57.14 5,564 47.00 0.0648
2018-05-14 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 18,971 6,617 53.56 3,785 54.55 0.0443
2018-02-14 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,354 -1,327 -9.70 2,449 -2.35 0.0351
2017-11-13 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,681 68 0.50 2,508 8.76 0.0414
2017-08-11 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 13,613 4,489 49.20 2,306 51.61 0.0453
2017-05-12 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,124 2,823 44.80 1,521 65.51 0.0392
2017-02-17 2016-12-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 6,301 6,301 919 0.0242
2017-02-14 2016-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 6,301 919
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.