Warren Buffett thinks big. You don't amass a net worth of well over $100 billion without doing so.

It's not surprising that he has led Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) to put a lot of money into some of the biggest companies on the planet. Nearly 70% of Buffett's $326 billion Berkshire portfolio is invested in these nine megacap stocks.

Apple (NASDAQ: AAPL) ranks as Berkshire's biggest holding, by far, making up 47% of the conglomerate's total portfolio. It's also the biggest company in the world with a market cap of more than $2.6 trillion. Buffett loves the "stickiness" of the company's products, stating in a CNBC interview earlier this year that many customers wouldn't give up their iPhones forever even if offered $10,000. 

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Source Fool.com