The Oracle of Omaha went on a buying spree in the first quarter.

What stocks has Warren Buffett bought and sold lately?

Each quarter, all fund managers with at least $100 million in assets must publicly disclose their stock holdings to the U.S. Securities and Exchange Commission

giving investors a rare peek behind the curtain of some of the world's largest and most successful hedge funds

One of the most anticipated quarterly filings comes from Buffett

and his $683 billion company Berkshire Hathaway Inc. (ticker: BRK.A, BRK.B)

Here's a look at 10 of the biggest changes the Oracle of Omaha made to Berkshire's portfolio in the first quarter

1. Bought: Chevron Corp. (CVX) 2. Bought: Occidental Petroleum Corp. (OXY) 3. Sold: Verizon Communications Inc. (VZ) 4. Bought: Activision Blizzard Inc. (ATVI) 5. Bought: Citigroup Inc. (C)

6.Bought: Paramount Global (PARA) 7. Bought: Celanese Corp. (CE) 8.Bought: McKesson Corp. (MCK) 9. Bought: Markel Corp. (MKL) 10. Bought: Ally Financial Inc. (ALLY)

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