Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionMairs & Power Inc
Latest Disclosed Ownership23,929 shares
Latest Disclosed Value $ 11,466,777
Mairs & Power Inc reports 3.73% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On May 13, 2026 - Mairs & Power Inc filed a 13F-HR form disclosing ownership of 23,929 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $11,466,777 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 5 shares of Berkshire Hathaway Inc.. This represents a change in shares of -3.73% 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 23,929 -928 -3.73 11,467 -8.23 0.1172
2026-02-17 2025-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,857 -522 -2.06 12,494 -2.08 0.1202
2025-11-14 2025-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,379 -713 -2.73 12,759 0.67 0.1199
2025-08-14 2025-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,092 1,488 6.05 12,675 -3.27 0.1251
2025-05-15 2025-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,604 -1,389 -5.34 13,104 11.21 0.1363
2025-02-14 2024-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,993 946 3.78 11,782 2.20 0.1140
2024-11-14 2024-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,047 -1,332 -5.05 11,528 7.44 0.1084
2024-08-14 2024-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,379 -85 -0.32 10,731 -3.58 0.1037
2024-05-15 2024-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,464 2,156 8.87 11,129 28.37 0.1078
2024-02-14 2023-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,308 -2,632 -9.77 8,670 -8.14 0.0914
2023-11-14 2023-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,940 1,124 4.35 9,437 7.20 0.1108
2023-08-14 2023-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,816 -21 -0.08 8,803 10.35 0.0957
2023-05-15 2023-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,837 3,230 14.29 7,978 14.23 0.0920
2023-02-14 2022-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 22,607 -926 -3.93 6,983 11.12 0.0841
2022-11-14 2022-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,533 -90 -0.38 6,284 -2.57 0.0793
2022-08-15 2022-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,623 -311 -1.30 6,450 -23.64 0.0773
2022-05-16 2022-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,934 222 0.94 8,447 19.14 0.0851
2022-02-14 2021-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,712 -286 -1.19 7,090 8.24 0.0657
2021-11-15 2021-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 23,998 -230 -0.95 6,550 -2.72 0.0655
2021-08-16 2021-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,228 -610 -2.46 6,733 6.12 0.0665
2021-05-14 2021-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 24,838 -1,691 -6.37 6,345 3.15 0.0666
2021-02-16 2020-12-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 26,529 1,122 4.42 6,151 13.70 0.0684
2020-11-16 2020-09-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,407 -240 -0.94 5,410 18.17 0.0676
2020-08-14 2020-06-30 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 25,647 -1,500 -5.53 4,578 -7.76 0.0598
2020-05-15 2020-03-31 13F BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 27,147 3,820 16.38 4,963 -6.07 0.0724
2020-02-14 2019-12-31 13F Berkshire Hathaway B COM 084670702 23,327 1,152 5.20 5,284 14.55 0.0600
2019-11-14 2019-09-30 13F Berkshire Hathaway B COM 084670702 22,175 -221 -0.99 4,613 -3.37 0.0558
2019-08-14 2019-06-30 13F Berkshire Hathaway B COM 084670702 22,396 233 1.05 4,774 7.23 0.0573
2019-05-15 2019-03-31 13F Berkshire Hathaway B COM 084670702 22,163 -170 -0.76 4,452 -2.37 0.0541
2019-02-14 2018-12-31 13F Berkshire Hathaway B COM 084670702 22,333 0 0.00 4,560 -4.64 0.0615
2018-11-14 2018-09-30 13F Berkshire Hathaway B COM 084670702 22,333 466 2.13 4,782 17.18 0.0557
2018-08-14 2018-06-30 13F Berkshire Hathaway B COM 084670702 21,867 25 0.11 4,081 -6.33 0.0506
2018-05-15 2018-03-31 13F Berkshire Hathaway B COM 084670702 21,842 5,598 34.46 4,357 35.31 0.0538
2018-02-14 2017-12-31 13F Berkshire Hathaway B COM 084670702 16,244 200 1.25 3,220 9.49 0.0373
2017-11-14 2017-09-30 13F Berkshire Hathaway B COM 084670702 16,044 1,500 10.31 2,941 19.41 0.0353
2017-08-14 2017-06-30 13F Berkshire Hathaway B COM 084670702 14,544 570 4.08 2,463 5.75 0.0298
2017-05-15 2017-03-31 13F Berkshire Hathaway B COM 084670702 13,974 200 1.45 2,329 3.74 0.0285
2017-02-14 2016-12-31 13F Berkshire Hathaway B COM 084670702 13,774 625 4.75 2,245 18.16 0.0288
2016-11-14 2016-09-30 13F Berkshire Hathaway B COM 084670702 13,149 -998 -7.05 1,900 -7.23 0.0250
2016-08-15 2016-06-30 13F Berkshire Hathaway B COM 084670702 14,147 430 3.13 2,048 5.24 0.0276
2016-05-16 2016-03-31 13F Berkshire Hathaway B COM 084670702 13,717 -71 -0.51 1,946 6.86 0.0277
2016-02-16 2015-12-31 13F Berkshire Hathaway B COM 084670702 13,788 150 1.10 1,821 2.42 0.0273
2015-11-16 2015-09-30 13F Berkshire Hathaway B COM 084670702 13,638 -85 -0.62 1,778 -4.82 0.0278
2015-08-14 2015-06-30 13F Berkshire Hathaway B COM 084670702 13,723 -730 -5.05 1,868 -10.45 0.0264
2015-05-15 2015-03-31 13F Berkshire Hathaway B COM 084670702 14,453 -100 -0.69 2,086 -4.53 0.0287
2015-02-17 2014-12-31 13F Berkshire Hathaway B COM 084670702 14,553 -1,261 -7.97 2,185 0.00 0.0303
2014-11-14 2014-09-30 13F Berkshire Hathaway B COM 084670702 15,814 750 4.98 2,185 14.64 0.0319
2014-08-14 2014-06-30 13F Berkshire Hathaway B COM 084670702 15,064 -2,117 -12.32 1,906 -11.22 0.0270
2014-05-15 2014-03-31 13F Berkshire Hathaway B COM 084670702 17,181 1,658 10.68 2,147 16.68 0.0318
2014-02-14 2013-12-31 13F Berkshire Hathaway B COM 084670702 15,523 950 6.52 1,840 11.25 0.0283
2013-11-14 2013-09-30 13F Berkshire Hathaway B COM 084670702 14,573 -499 -3.31 1,654 -1.96 0.0286
2013-08-14 2013-06-30 13F Berkshire Hathaway B COM 084670702 15,072 15,072 1,687 0.0322
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.