Elon Musk’s companies are having a bad week on the markets: Why SpaceX and Tesla stock prices are down

July has been a horrible month for the stock prices of Elon Musk’s two publicly traded companies: Tesla (Nasdaq: TSLA) and SpaceX (Nasdaq: SPCX). As of the close of markets yesterday, the two companies have seen their stock prices decline by roughly 24% and 31%, respectively, since June 30. Here’s what you need to know. Tesla stock got hammered yesterday Let’s start with Tesla, Inc. While the electric vehicle company has seen its stock price decline for most of July, the drop had been subtle,…