These two megacap stocks have Berkshire Hathaway in their sights.

Berkshire Hathaway ( BRK.B 0.12% ) ( BRK.A -0.72% ) is a legendary stock with decades of above-average performance. Yet, even legends can fade. And, in recent years, it seems as though more and more stocks are surpassing Berkshire's market cap.

For example, 10 years ago, Berkshire's market cap stood at around $330 billion. There were only a few American companies with a higher market cap: Apple ($640 billion), Alphabet ($420 billion), and Microsoft ($340 billion).

Yet, as of this writing, there are eight American companies with market caps greater than Berkshire's $1.05 trillion market cap. Nvidia 's market cap alone is 4 times larger than Berkshire's -- and 10 years ago, Nvidia's market cap was a s

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