Berkshire Hathaway Inc.
MX ˙ BMV
SecurityMX:BRKB / Berkshire Hathaway Inc.
InstitutionMassmutual Trust Co Fsb/adv
Latest Disclosed Ownership90,398 shares
Latest Disclosed Value $ 43,318,722
Massmutual Trust Co Fsb/adv reports 1.34% decrease in ownership of BRKB / Berkshire Hathaway Inc.

On April 13, 2026 - Massmutual Trust Co Fsb/adv filed a 13F-HR form disclosing ownership of 90,398 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $43,318,722 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 7, 2026 disclosing 91,623 shares of Berkshire Hathaway Inc.. This represents a change in shares of -1.34% 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)
2026-04-13 2026-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 90,398 -1,225 -1.34 43,319 -5.94 1.1796
2026-01-07 2025-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 91,623 -1,120 -1.21 46,054 -1.22 1.1852
2025-10-22 2025-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 92,743 -31 -0.03 46,626 3.46 1.1876
2025-07-09 2025-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 92,774 577 0.63 45,067 -8.22 1.2008
2025-04-01 2025-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 92,197 403 0.44 49,102 18.01 1.4203
2025-01-16 2024-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 91,794 15,729 20.68 41,608 18.85 1.1673
2024-10-02 2024-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 76,065 1,606 2.16 35,010 15.58 0.9971
2024-07-02 2024-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 74,459 438 0.59 30,290 -2.69 0.9190
2024-04-09 2024-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 74,021 6,040 8.88 31,127 28.38 0.9686
2024-01-03 2023-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 67,981 -937 -1.36 24,246 0.43 0.8134
2023-10-04 2023-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 68,918 526 0.77 24,142 3.52 0.8914
2023-08-02 2023-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 68,392 464 0.68 23,322 11.19 0.8387
2023-04-11 2023-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 67,928 -14,537 -17.63 20,974 83,796.00 0.8017
2023-01-06 2022-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 82,465 731 0.89 25 19.05 1.0479
2022-10-07 2022-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 81,734 967 1.20 22 -4.55 0.9904
2022-07-07 2022-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 80,767 40 0.05 22 -21.43 0.9550
2022-04-08 2022-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 80,727 1,209 1.52 28 21.74 1.0769
2022-02-09 2021-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 79,518 -1,900 -2.33 24 4.55 0.8829
2021-11-12 2021-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 81,418 2,237 2.83 22 0.00 0.9187
2021-08-16 2021-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 79,181 1,562 2.01 22 15.79 0.9347
2021-05-17 2021-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 77,619 -12,400 -13.77 20 -5.00 0.9326
2021-02-16 2020-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 90,019 415 0.46 21 5.26 1.0688
2020-11-13 2020-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 89,604 -3,702 -3.97 19 -99.89 1.1153
2020-08-13 2020-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 93,306 4,829 5.46 16,656 2.97 1.0734
2020-05-15 2020-03-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 88,477 17,750 25.10 16,176 0.97 1.2914
2020-05-15 2019-12-31 13F Berkshire Hathaway Common / Ordinary Stock 084670702 70,727 13,657 23.93 16,020 34.94 0.9896
2019-11-14 2019-09-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 57,070 2,070 3.76 11,872 1.26 0.7951
2019-08-14 2019-06-30 13F Berkshire Hathaway Common / Ordinary Stock 084670702 55,000 -5,547 -9.16 11,724 -3.61 0.8107
2019-05-15 2019-03-31 13F Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 60,547 -238 -0.39 12,163 -2.00 0.8771
2019-02-26 2018-12-31 13F Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 60,785 462 0.77 12,411 -3.90 1.0622
2018-11-09 2018-09-30 13F Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 60,323 228 0.38 12,916 15.15 0.9584
2018-08-20 2018-06-30 13F Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 60,095 804 1.36 11,217 -5.17 0.8953
2018-05-21 2018-03-31 13F Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 59,291 -2,916 -4.69 11,827 -4.08 0.9786
2018-03-01 2017-12-31 13F/A-1 Berkshire Hathaway B Shares Common / Ordinary Stock 084670702 62,207 251 0.41 12,331 8.57 1.0215
2018-02-21 2017-12-31 13F Cara Therapeutics Common / Ordinary Stock 084670702 250 -61,706 3
2018-02-13 2017-09-30 13F Berkshire Hathaway B Shares common 084670702 61,956 -2,649 -4.10 11,358 3.79 0.9412
2017-08-14 2017-06-30 13F Berkshire Hathaway B Shares common 084670702 64,605 805 1.26 10,942 2.90 0.9742
2017-05-02 2017-03-31 13F Berkshire Hathaway Inc Cl B common 084670702 63,800 -1,376 -2.11 10,634 0.11 0.9988
2017-02-13 2016-12-31 13F Berkshire Hathaway Inc Cl B common 084670702 65,176 -3,894 -5.64 10,622 6.22 1.2992
2016-08-10 2016-06-30 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 69,070 4,974 7.76 10,001 9.97 1.2637
2016-05-10 2016-03-31 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 64,096 7,032 12.32 9,094 20.69 1.2266
2016-02-12 2015-12-31 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 57,064 10,523 22.61 7,535 17.19 1.0776
2015-11-04 2015-09-30 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 46,541 3,161 7.29 6,429 17.10 1.3564
2015-07-29 2015-06-30 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 43,380 -13,658 -23.95 5,490 -33.30 1.2263
2015-05-11 2015-03-31 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 57,038 23,267 68.90 8,232 62.35 1.3565
2015-02-05 2014-12-31 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 33,771 -12,770 -27.44 5,071 -21.14 1.6393
2014-11-04 2014-09-30 13F BERKSHIRE HATHAWAY INC-CL B COMMON STOCK 084670702 46,541 22,261 91.68 6,429 109.28 1.2779
2014-07-09 2014-06-30 13F BERKSHIRE HATHAWAY INC-CL B COMMON STOCK 084670702 24,280 5,452 28.96 3,073 30.61 1.2142
2014-05-15 2014-03-31 13F BERKSHIRE HATHAWAY INC-CL B common 084670702 18,828 7,289 63.17 2,353 71.93 1.3760
2014-02-14 2013-12-31 13F/A-1 BERKSHIRE HATHAWAY INC-CL B COMMON STOCK 084670702 11,539 11,539 1,368 1.2584
2014-02-13 2013-12-31 13F BERKSHIRE HATHAWAY INC-CL B COMMON STOCK 084670702 11,539 1,368 1.2584
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.