Berkshire Hathaway Inc (BRK.B)

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"Exxon Mobil was responsible for lifetime wealth creation of $939.8 billion. Thus, Exxon Mobile alone was responsible for 2.96% of the $31.8 trillion in total wealth creation by CRSP common stocks over the 1926 to 2015 period. Apple Corporation was responsible for an additional 2.13% of total stock market wealth creation. The right column of Table 4 displays the cumulative percentage of total U.S. stock market wealth creation since 1926 accounted for by the indicated firm and those listed above it on the Table. It can be observed that the top thirty firms together accounted for 31.2% of the total stock market’s wealth creation."

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