NEW YORK (TheStreet) -- Warren Buffett is considered the most respected and successful investor. Often called "The Oracle of Omaha" for his impressive investing prowess, he is among the world's wealthiest people.

Buffett studied under the legendary Benjamin Graham at Columbia University who had a major impact on Buffett's life and investment strategies.

Buffett is chairman of Omaha, Nebraska-based Berkshire Hathaway Inc which he built from a textile company into a major corporation with a market cap over $324 billion. Under Buffett's leadership, Berkshire shares averaged a 19.7% compounded annual gain in per share book value from 1965-2013.

He follows a value investing strategy that is an adaptation of Graham's approach: Discipline, patience and value consistently outperforms the market. His moves are followed by investors worldwide. Buffett seeks to acquire great companies trading at a discount to their intrinsic value, and to hold onto them for a long time. He will only invest in businesses that he understands, and always insists on a margin of safety.

Regarding the types of businesses Berkshire likes to purchase, Buffett has said,"We want businesses to be one that we can understand, with favorable long-term prospects, operated by honest and competent people, and available at a very attractive price."

What follows are Buffett's top 25 holdings as of June 30, 2014...

25. Precision Castparts Corp.

Shares Held by Warren Buffett's Berkshire Hathaway: 1,877,000 shares
Value of Holdings: $474 million
Portfolio Weighting as of 06/30/2014: 0.44%

Precision Castparts Corp. manufactures and sells metal components and products worldwide.

It operates in three segments: Investment Cast Products, Forged Products, and Airframe Products.

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TheStreet Ratings team rates PRECISION CASTPARTS CORP as a Buy with a ratings score of A-. TheStreet Ratings Team has this to say about their recommendation:

"We rate PRECISION CASTPARTS CORP (PCP) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, impressive record of earnings per share growth, expanding profit margins, increase in net income and notable return on equity. Although no company is perfect, currently we do not see any significant weaknesses which are likely to detract from the generally positive outlook."

You can view the full analysis from the report here: PCP Ratings Report