Quant funds have been slammed over the last couple of days, with big names like Bridgewater, Schonfeld, and Renaissance taking a hit. Several quant investors told Business Insider that it's worse than 2007, when the infamous "Quant Quake" steamrolled even the most savvy of funds. "Of course we are questioning if we should have done things differently," Bridgewater founder Ray Dalio wrote in a note to investors. Click here for more BI Prime stories. For long-running quant funds, their financial crisis happened in 2007, not 2008.