Contravisory Investment Management, Inc. reports 2.78% increase in ownership of BRKB / Berkshire Hathaway Inc.

Berkshire Hathaway Inc.

MX ˙ BMV

Security	MX:BRKB / Berkshire Hathaway Inc.
Institution	Contravisory Investment Management, Inc.
Latest Disclosed Ownership	2,219 shares
Latest Disclosed Value	$ 1,063,345

On April 20, 2026 - Contravisory Investment Management, Inc. filed a 13F-HR form disclosing ownership of 2,219 shares of Berkshire Hathaway Inc. (MX:BRKB) valued at $1,063,345 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 2,159 shares of Berkshire Hathaway Inc.. This represents a change in shares of 2.78% 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-04-20	2026-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	2,219	60	2.78	1,063	-2.03	0.2179
2026-01-12	2025-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	2,159	-35	-1.60	1,085	-1.63	0.2150
2025-10-09	2025-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	2,194	-77	-3.39	1,103	0.00	0.2136
2025-07-10	2025-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	2,271	26	1.16	1,103	-7.70	0.2170
2025-04-10	2025-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	2,245	1,028	84.47	1,196	116.88	0.2518
2025-01-14	2024-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,217	-56	-4.40	552	-5.81	0.1180
2024-10-09	2024-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,273	-6	-0.47	586	12.50	0.1253
2024-07-10	2024-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,279	-21	-1.62	520	-4.76	0.1152
2024-04-11	2024-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,300	-15	-1.14	547	16.42	0.1211
2024-01-11	2023-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,315	-33	-2.45	469	-0.64	0.1150
2023-10-10	2023-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,348	-84	-5.87	472	-3.28	0.1337
2023-07-12	2023-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,432	-8	-0.56	488	9.91	0.1291
2023-04-12	2023-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,440	-13	-0.89	445	-0.89	0.1255
2023-01-13	2022-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,453	170	13.25	449	30.61	0.1244
2022-10-12	2022-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,283	20	1.58	343	-0.58	0.1145
2022-07-13	2022-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,263	83	7.03	345	-17.07	0.1119
2022-04-08	2022-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,180	979	487.06	416	593.33	0.1180
2022-01-12	2021-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	0	0.00	60	9.09	0.0162
2021-10-12	2021-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	0	0.00	55	-1.79	0.0167
2021-07-14	2021-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	0	0.00	56	9.80	0.0165
2021-04-14	2021-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	0	0.00	51	8.51	0.0159
2021-01-13	2020-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	0	0.00	47	9.30	0.0146
2020-10-08	2020-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	201	-1,188	-85.53	43	-83.00	0.0147
2020-07-09	2020-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	1,389	400	40.44	253	39.78	0.0930
2020-04-09	2020-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	989	406	69.64	181	37.12	0.0802
2020-01-09	2019-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	583	70	13.65	132	23.36	0.0483
2019-10-07	2019-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	513	0	0.00	107	-1.83	0.0406
2019-07-09	2019-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	513	71	16.06	109	22.47	0.0422
2019-04-08	2019-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	442	0	0.00	89	-1.11	0.0345
2019-01-14	2018-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	442	167	60.73	90	52.54	0.0389
2018-10-11	2018-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	275	0	0.00	59	15.69	0.0212
2018-07-11	2018-06-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	275	0	0.00	51	-7.27	0.0186
2018-04-09	2018-03-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	275	0	0.00	55	0.00	0.0203
2018-01-18	2017-12-31	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	275	-55	-16.67	55	-8.33	0.0199
2017-10-12	2017-09-30	13F	BERKSHIRE HATHAWAY INC DEL	CL B NEW	084670702	330	330		60		0.0214
2017-07-25	2017-06-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	0	-255	-100.00	0	-100.00
2017-04-07	2017-03-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	255	0	0.00	43	2.38	0.0152
2017-01-12	2016-12-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	255	0	0.00	42	13.51	0.0143
2016-10-11	2016-09-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	255	41	19.16	37	19.35	0.0119
2016-07-13	2016-06-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	214	0	0.00	31	3.33	0.0095
2016-04-11	2016-03-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	214	14	7.00	30	15.38	0.0088
2016-01-12	2015-12-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	26	0.00	0.0069
2015-10-15	2015-09-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	26	-3.70	0.0061
2015-07-09	2015-06-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	27	-6.90	0.0059
2015-04-14	2015-03-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	29	-3.33	0.0058
2015-01-12	2014-12-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	30	7.14	0.0061
2014-10-10	2014-09-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	28	12.00	0.0058
2014-07-17	2014-06-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	25	0.00	0.0049
2014-04-16	2014-03-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	25	4.17	0.0049
2014-01-09	2013-12-31	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	24	4.35	0.0046
2013-10-11	2013-09-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	0	0.00	23	4.55	0.0048
2013-07-15	2013-06-30	13F	Berkshire Hathaway, Inc. Class B	com	084670702	200	200		22		0.0049

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.