Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionWestpac Banking Corp
Latest Disclosed Ownership15,402 shares
Latest Disclosed Value $ 7,380,639
Westpac Banking Corp reports 52.33% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 15,402 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $7,380,639 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 10,111 shares of Berkshire Hathaway Inc.. This represents a change in shares of 52.33% 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)
2026-05-11 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 15,402 5,291 52.33 7,381 45.22 0.2571
2026-02-10 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,111 -166 -1.62 5,082 -1.63 0.3210
2025-11-14 2025-09-30 13F/A-1 BERKSHIRE HATHAWAY INC USD 0.0033 CL B NEW 084670702 10,277 0 0.00 5,167 3.49 0.3202
2025-11-12 2025-09-30 13F BERKSHIRE HATHAWAY INC USD 0.0033 CL B NEW 084670702 10,277 0 5,167 0.1297
2025-08-11 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 10,277 6,933 207.33 4,992 180.45 0.3337
2025-05-13 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,781 17.49 0.1310
2025-02-12 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,516 -1.56 0.1006
2024-11-08 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,539 13.16 0.1032
2024-08-14 2024-06-30 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,360 -3.27 0.1079
2024-08-13 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 1,360 0.0468
2024-05-09 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,406 17.95 0.1071
2024-02-08 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,193 1.79 0.0983
2023-11-13 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 0 0.00 1,171 2.72 0.0876
2023-08-10 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 3,344 -113,191 -97.13 1,140 -96.83 0.0805
2023-05-04 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 116,535 232 0.20 35,983 0.16 0.4837
2023-02-06 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 116,303 -4,024 -3.34 35,926 11.81 0.5311
2022-11-08 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 120,327 1,846 1.56 32,130 -0.67 0.4898
2022-08-10 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 118,481 -2,378 -1.97 32,348 -24.16 0.4214
2022-05-11 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 120,859 -3,054 -2.46 42,652 15.12 0.4893
2022-02-08 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 123,913 77,084 164.61 37,050 189.88 0.3838
2021-10-27 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 46,829 -124,198 -72.62 12,782 -73.11 0.1366
2021-08-11 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 171,027 8,690 5.35 47,532 14.61 0.4772
2021-05-13 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 162,337 -22,907 -12.37 41,472 -3.45 0.4576
2021-02-11 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 185,244 2,859 1.57 42,953 10.60 0.4875
2020-11-10 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CCL B NEW 084670702 182,385 615 0.34 38,837 19.69 0.5263
2020-08-12 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 181,770 6,700 3.83 32,448 1.37 0.4837
2020-05-14 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 175,070 -3,379 -1.89 32,008 -20.81 0.5515
2020-02-11 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 178,449 5,537 3.20 40,419 12.37 0.5203
2019-11-13 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 172,912 -66,917 -27.90 35,969 -29.64 0.5001
2019-08-01 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 239,829 9,763 4.24 51,124 10.62 0.7807
2019-05-14 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 230,066 4,028 1.78 46,218 0.14 0.7629
2019-02-07 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 226,038 75,489 50.14 46,152 43.18 0.7865
2018-11-13 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 150,549 521 0.35 32,234 15.11 0.5526
2018-07-18 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 150,028 1,855 1.25 28,003 -5.26 0.5380
2018-05-01 2018-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 148,173 7,837 5.58 29,558 6.26 0.5903
2018-01-18 2017-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 140,336 265 0.19 27,817 8.33 0.6321
2017-10-30 2017-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 140,071 -497 -0.35 25,678 7.85 0.5653
2017-08-09 2017-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 140,568 -120,219 -46.10 23,808 -45.23 0.5241
2017-05-18 2017-03-31 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 260,787 29,236 12.63 43,468 2.50 0.3484
2017-05-11 2017-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 163,653 25,259
2017-02-09 2016-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 231,551 9,915 4.47 42,409 32.45 0.3999
2016-11-10 2016-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 221,636 -32,958 -12.95 32,020 -7.93 0.3459
2016-08-10 2016-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 254,594 56,032 28.22 34,777 41.13 0.3807
2016-05-13 2016-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 198,562 1,487 0.75 24,642 -5.30 0.2679
2016-02-11 2015-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 197,075 25,281 14.72 26,022 16.16 0.2879
2015-11-16 2015-09-30 13F/A-1 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 171,794 26,406 18.16 22,402 13.20 0.2466
2015-11-12 2015-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 171,794 22,402
2015-08-12 2015-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 145,388 -35,138 -19.46 19,789 -34.93 0.1935
2015-05-12 2015-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 180,526 2,261 1.27 30,412 13.62 0.2642
2015-02-11 2014-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 178,265 -1,226 -0.68 26,766 7.95 0.2546
2014-11-12 2014-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 179,491 -1,281 -0.71 24,795 8.37 0.2416
2014-08-11 2014-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 180,772 860 0.48 22,879 1.76 0.2204
2014-05-12 2014-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 179,912 7,906 4.60 22,484 10.26 0.2394
2014-02-13 2013-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 172,006 -128 -0.07 20,391 4.37 0.2333
2013-11-12 2013-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 172,134 22,585 15.10 19,537 19.55 0.2442
2013-08-14 2013-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 149,549 149,549 16,343 0.2498
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.