Ad tech company Rocket Fuel sold for a fraction of its peak $2 billion valuation, and it marks the end of an era

Mark Kolbe/Getty Images When a company that pulled in over $450 million in revenue in 2016 and over $95 million during the first quarter of this year suddenly sells forjust $125.5 million, it raises eyebrows. That's what happened on Tuesday when the ad tech company Rocket Fuel was acquired by rival Sizmek. The deal appears to mark the end of an era for the ad tech industry, which has been characterized by a massive flood of funding, a proliferation of startups, several rocky IPOs, along with lot...