HIGHER: Chemical Financial (CHFC), up 6% after announcing TCF Financial (TCF) will merge into the company and the combined holding company and bank will operate under the TCF name and brand following the closing of the transaction… Zayo Group (ZAYO), up 4% after Bloomberg reports Alphabet (GOOGL), CenturyLink (CTL) and the infrastructure arm of private equity firm EQT Partners are among the potential suitors weighing takeover bids for the company… GrubHub (GRUB), up 3% after Credit Suisse analyst Stephen Ju upgraded the stock to Outperform from Neutral and raised his price target on the shares to $130 from $125… Inphi (IPHI), up 3% after DA Davidson analyst Mark Kelleher upgraded shares to Buy from Neutral and raised his price target to $45 from $38. DOWN AFTER EARNINGS: Caterpillar (CAT), down 6.5%… Alliance Resource Partners (ARLP), down 1%. LOWER: Nvidia (NVDA), down 11% after cutting its revenue view for its “extraordinary, unusually turbulent, disappointing” quarter. Shares of competitor AMD (AMD) are also down 6% following Nvidia’s revenue warning… Vale (VALE), down 11% after announcing that it is weighing non-payment of dividends after a deadly dam breach… PG&E (PCG), down 9% after Axios reports the company is still planning to file for bankruptcy… Crispr Therapeutics (CRSP), down 5% after Goldman Sachs analyst Salveen Richter downgraded the stock to Neutral and cut his price target for the shares to $40 from $78… Autohome (ATHM), down 4% after JPMorgan analyst Binbin Ding downgraded shares to Underweight.