Space company and new IPO Firefly is due for its first earnings report tomorrow. The Vanguard S&P 500 ETF (NYSEMKT: VOO) gained 1.2% last week, but is looking like it might take a breather Monday, down 0.3% premarket. EarningsNo companies of any real size reported earnings today. For whatever reason, companies mostly prefer to report earnings midweek. Of the above, only Cintas and Costco are S&P 500 components.