Wall Street set to selloff as oil approaches $40 By: CNBC.com News August 20, 2015 at 05:34 AM EDT U.S. stock index futures indicated a sharply lower open on Thursday, with Dow futures down as much as 160 points, as oil prices extended losses. Read More >> Related Stocks: Buckle Inc GX Defense Tech ETF Gap Hewlett-Packard Intuit Marvell Technology Inc Ross Stores Salesforce Sentinelone Inc Cl A