(For faster updates on individual market-movers, Eikon users please use search string "STXBZ US"; for the Day Ahead newsletter, link.reuters.com/mex49s; for the Morning News Call newsletter, link.reuters.com/nex49s) U.S. stock index futures plunged on Thursday, with risk-averse investors piling into safe haven assets as another sharp fall in oil prices and cautious comments from Federal Reserve Chair Janet Yellen raised fresh doubts about the health of the economy. Dow Jones industrial average futures were down 1.59 percent at 15,613, S&P 500 futures were down 1.58 percent at 1,817.5 and Nasdaq 100 futures were down 1.75 percent at 3,898.
** TWITTER INC, Wednesday close $14.98, -5.94 pct premarket
The company reported its first quarter with no growth in users since it went public, stoking fresh concerns on how long it will take for the company to reverse the trend.
** MYLAN NV, Wednesday close $50.54, -13.79 pct premarket
The generic drugmaker said it would acquire Meda AB in a $7.2 billion cash-and-stock deal in its third attempt to buy the Swedish company.
** EXPEDIA INC, Wednesday close $94.35, +9.27 pct premarket
The company on Wednesday forecast a rise in 2016 earnings in part from recent acquisitions, pushing shares up even though the company warned that the Nov. 13 Paris attacks hurt travel demand and its fourth-quarter profit fell below analysts' estimates.
** ALPHABET INC, Wednesday close $706.85, -1.96 pct premarket
The company's Google unit told U.S. auto safety regulators that the government's interpretation of motor vehicle safety rules is "extremely important" to its further development of fully self-driving cars.
** CISCO SYSTEMS INC, Wednesday close $22.51, +5.15 pct premarket
The network equipment maker reported a bigger-than-expected quarterly profit, helped by higher demand for its routers and security products, and added $15 billion to its share buyback program.
** TRIPADVISOR INC, Wednesday close $54.35, +6.62 pct premarket
The travel review website operator reported a 7.3 percent rise in quarterly revenue as it earned more from display ads and subscriptions.
** TIME INC, Wednesday close $13.57
The magazine publisher reported a 2 percent fall in quarterly revenue, hurt by a stronger dollar and a fall in income from print advertisements.
** JETBLUE AIRWAYS CORP, Wednesday close $20.13
The company said on Thursday it launched a venture capital unit that would invest in technology startups in the travel and hospitality industry.
** WALGREENS BOOTS ALLIANCE INC, Wednesday close $76.01, -2.67 pct premarket
The largest U.S. drugstore chain threatened to terminate its relationship with Theranos Inc unless the blood-testing company quickly fixes the problems found by federal inspectors at its laboratory in California, the Wall Street Journal reported.
** TESLA MOTORS INC, Wednesday close $143.67, +2.69 pct premarket
Chief Executive Elon Musk on Wednesday promised investors that the electric luxury car maker will start making money this year, sending the company's shares up despite a wider fourth-quarter loss.
** CAESARS ENTERTAINMENT CORP, Wednesday close $6.04
The senior creditors of the company's bankrupt operating unit are threatening to abandon a framework agreement and propose their own formal restructuring plan as soon as Monday, court documents showed.
** TECK RESOURCES LTD, Wednesday close $3.91
The Canadian miner reported a surprise quarterly profit as cost cutting helped offset the impact of lower commodity prices.
** KEYCORP, Wednesday close $10.52
** FIRST NIAGARA FINANCIAL GROUP INC, Wednesday close $9.16
New York Governor Andrew Cuomo on Wednesday urged federal regulators to block KeyCorp's plan to acquire First Niagara Financial Group Inc, saying the merger would impede retail banking competition and cost thousands of jobs upstate. ]
** PEPSICO INC, Wednesday close $97.62
The company reported better-than-expected quarterly net revenue, as higher sales of snacks and beverages in North America helped reduce the impact of a strong dollar.
** KINROSS GOLD, Wednesday close $2.57, +11.67 pct premarket
** ALAMOS GOLD INC, Wednesday close $3.81, +10.24 pct premarket
** MCEWEN MINING INC, Wednesday close $1.48, +9.46 pct premarket
** YAMANA GOLD, Wednesday close $2.44, +8.61 pct premarket
** HARMONY GOLD, Wednesday close $2.38, +10.50 pct premarket
** GOLD FIELDS LTD, Wednesday close $4.05, +8.89 pct premarket
** IAMGOLD, Wednesday close $2.06, +9.22 pct premarket
** BARRICK GOLD, Wednesday close $11.58, +6.74 pct premarket
** SEABRIDGE GOLD, Wednesday close $7.76, +6.57 pct premarket
** SIBANYE GOLD, Wednesday close $10.79, +9.55 pct premarket
Gold prices surged above $1,200 per ounce on Thursday, boosted by bets that the Fed could find it hard to hike interest rates this year and safe-haven demand. (Reporting by Rosmi Shaji in Bengaluru; Editing by Maju Samuel)