I went to Yahoo Finance and looked at the Jan 1 2022 vs Jan 1 2021 market prices, then plugged them into Google calculator to get a percentage gain. BRK-B = 31

I went to Yahoo Finance and looked at the Jan 1 2022 vs Jan 1 2021 market prices, then plugged them into Google calculator to get a percentage gain. BRK-B = 313.2 / 227.87 = 37.88%, AAPL = 174.78 / 131.96 = 32.82%, S&P 500 = 4515 / 3714 = 21.56%. Not really sure how the table at the beginning of Berkshire's annual report is figured. Perhaps they're only marking the public equity portion of their portfolio to market and holding the private equity portion at the price they paid for it minus depreciation, as a sibling comment here suggested. This'll undercount things significantly since, as the annual report notes, they're the largest owner of private infrastructure in the U.S. Plus they bought many of those private assets in the 70s and 80s when price levels were a lot lower.