Investing.com -- Short sellers have increased their positions in SpaceX before two major events next week: the company's first earnings report as a public company and the release of hundreds of millions of locked-up shares. Two days later, as many as 911.5 million shares could become available for trading under the company's staggered lock-up arrangement. The cost of betting against Musk's rocket, satellite and artificial intelligence company has also risen as short sellers position for those events. SpaceX currently has about 640 million shares available for trading, or roughly 5% of its total shares outstanding. Related articlesShort sellers pile into SpaceX ahead of earnings, lockup expirationNovo Nordisk stock tumbles 10% as key trial misses goalT-Mobile executives oppose $300B Deutsche Telekom merger plan - report