Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionKorea Investment CORP
Latest Disclosed Ownership1,041,743 shares
Latest Disclosed Value $ 499,203,246
Korea Investment CORP reports 1.56% increase in ownership of BRKB / Berkshire Hathaway Inc.

On May 13, 2026 - Korea Investment CORP filed a 13F-HR form disclosing ownership of 1,041,743 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $499,203,246 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,025,747 shares of Berkshire Hathaway Inc.. This represents a change in shares of 1.56% 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)
2026-05-13 2026-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,041,743 15,996 1.56 499,203 -3.18 1.0342
2026-02-13 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,025,747 13,970 1.38 515,592 1.36 1.0149
2025-11-13 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,011,777 -15,956 -1.55 508,661 1.89 1.0462
2025-08-13 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,027,733 -15,387 -1.48 499,242 -10.13 1.1107
2025-05-14 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,043,120 26,068 2.56 555,545 20.51 1.3464
2025-02-12 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,017,052 -37,560 -3.56 461,009 -5.02 1.0930
2024-11-13 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,054,612 39,209 3.86 485,396 17.51 1.1520
2024-08-13 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,015,403 -56,634 -5.28 413,066 -8.37 1.0407
2024-05-14 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,072,037 -49,846 -4.44 450,813 12.67 1.1440
2024-02-13 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,121,883 52,911 4.95 400,131 6.86 1.0507
2023-11-13 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,068,972 49,395 4.84 374,461 7.70 1.1031
2023-08-11 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,019,577 -61,979 -5.73 347,676 4.11 0.9769
2023-05-12 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,081,556 7,774 0.72 333,952 0.68 0.9724
2023-02-13 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,073,782 -42,821 -3.83 331,691 11.25 1.0420
2022-11-10 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,116,603 76,930 7.40 298,155 5.04 0.9178
2022-08-12 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,039,673 -40,445 -3.74 283,852 -25.53 0.8676
2022-05-13 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,080,118 148,737 15.97 381,184 36.88 0.9428
2022-02-09 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 931,381 28,750 3.19 278,483 13.04 0.7238
2021-11-12 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 902,631 43,161 5.02 246,364 3.14 0.7345
2021-08-12 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 859,470 -2,404 -0.28 238,864 8.48 0.6842
2021-05-13 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 861,874 -161,430 -15.78 220,183 -7.20 0.6950
2021-02-10 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,023,304 59,494 6.17 237,273 15.61 0.7129
2020-11-12 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 963,810 -33,700 -3.38 205,234 15.26 0.7252
2020-08-12 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 997,510 18,800 1.92 178,066 -0.49 0.6542
2020-05-14 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 978,710 -78,630 -7.44 178,938 -25.28 0.7854
2020-02-11 2019-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 1,057,340 61,500 6.18 239,488 15.61 0.8731
2019-11-12 2019-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 995,840 -3,300 -0.33 207,155 -2.74 0.8757
2019-08-12 2019-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 999,140 29,300 3.02 212,987 9.32 0.9157
2019-05-15 2019-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 969,840 74,575 8.33 194,831 6.58 0.8768
2019-02-13 2018-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 895,265 9,100 1.03 182,795 -3.66 0.9935
2018-11-13 2018-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 886,165 -6,706 -0.75 189,737 13.85 0.8750
2018-08-13 2018-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B 084670702 892,871 -5,800 -0.65 166,654 -7.04 0.7593
2018-05-09 2018-03-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 898,671 6,531 0.73 179,267 1.37 0.8342
2018-02-12 2017-12-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 892,140 57,574 6.90 176,840 15.59 0.8049
2017-10-25 2017-09-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 834,566 -12,400 -1.46 152,993 6.65 0.7068
2017-07-31 2017-06-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 846,966 13,597 1.63 143,451 3.27 0.6685
2017-04-25 2017-03-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 833,369 -41,564 -4.75 138,906 -2.59 0.6890
2017-02-13 2016-12-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 874,933 14,838 1.73 142,597 14.76 0.6853
2016-11-09 2016-09-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 860,095 49,516 6.11 124,258 5.87 0.6623
2016-08-12 2016-06-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 810,579 191,800 31.00 117,364 33.68 0.6988
2016-05-12 2016-03-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 618,779 -42,700 -6.46 87,792 0.52 0.6420
2016-02-01 2015-12-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 661,479 50,700 8.30 87,341 9.66 0.6085
2015-11-12 2015-09-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 610,779 78,679 14.79 79,645 9.97 0.6342
2015-08-13 2015-06-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 532,100 -52,500 -8.98 72,424 -14.16 0.6173
2015-05-11 2015-03-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 584,600 23,200 4.13 84,369 0.09 0.6573
2015-02-12 2014-12-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 561,400 -36,100 -6.04 84,294 2.13 0.6919
2014-11-14 2014-09-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 597,500 9,600 1.63 82,539 10.93 0.6734
2014-08-14 2014-06-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 587,900 143,100 32.17 74,405 33.85 0.6194
2014-05-14 2014-03-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 444,800 24,500 5.83 55,587 11.55 0.4922
2014-02-06 2013-12-31 13F BERKSHIRE HATHAWAY DEL CL B 084670702 420,300 32,600 8.41 49,831 13.23 0.4712
2013-11-07 2013-09-30 13F/A-1 BERKSHIRE HATHAWAY DEL CL B 084670702 387,700 31,900 8.97 44,008 10.51 0.4676
2013-11-05 2013-09-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 252,400 28,650
2013-08-08 2013-06-30 13F BERKSHIRE HATHAWAY DEL CL B 084670702 355,800 355,800 39,821 0.4773
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.