ET on Tuesday (November 14), Berkshire Hathaway filed its latest Form 13F with the SEC。According to data platform WhaleWisdom, as of the end of September, Berkshire had entered a total of four new stocks and reduced its holdings of seven of all U.S. stock positions, while also liquidating seven stocks.。The clearance list includes Activision Blizzard, General Motors, engineering plastics manufacturer Celanese, and some consumer stocks - Yizi International, Johnson & Johnson, Procter & Gamble and United Parcel Class B shares.。In addition, Buffett has fully liquidated his 22 million shares of GM。Industry insiders had speculated that Berkshire Hathaway's motive for selling shares could be the strike threat facing the auto industry.。In fact, at this May's shareholder meeting, Buffett had early warning。He has said that car manufacturing has too many competitors around the world to generate attractive returns.。