OMAHA, Neb. (AP) – Investor Warren Buffett’s company sold some of its Goldman Sachs and Wal-Mart shares during the third quarter, and made several smaller changes to its stock portfolio. Berkshire Hathaway Inc. filed a report on its U.S. stocks Monday with the Securities and Exchange Commission. Buffett said on CNBC the main reason he reduced Berkshire’s Wal-Mart and Goldman stakes was to generate cash for his $32 billion acquisition of Precision Castparts that’s expected to close next year. Berkshire sold 13 percent of its 12.6 million Goldman shares and unloaded 7 percent of its 60.4 million Wal-Mart shares. Many investors like to copy Buffett’s moves because of his remarkably successful record, so these quarterly filings are watched closely.