It's been an ugly stock market for most investors. But famed inventor and investor Elon Musk is having an exceptionally bad year - not just on one investment - but two. Musk's holdings in solar panel installer SolarCity (SCTY) and electric car maker Tesla (TSLA) are down a staggering $3.3 billion - just this year. Musk is the largest single owner of both companies - which together have handed all investors total market value losses of $14.8 billion this year. Both Musk's companies have been falling out of favor with investors this year as the market punishes companies that are thin on profit but high on valuation. ... (full story)