Global markets sell off after downing of Russian warplane
Activist investor Carl Icahn has taken a in Xerox (XRX), saying it's undervalued and he may seek board seats. Last month, Xerox began a review of its businesses and an assessment of its options. (Reuters)

Activist investor Bill Ackman has increased his stake in Valeant (VRX) to . He said he was taking advantage of the slump in the stock which followed a criticism of its business practices. (AP)

An under-the-radar, $1.5 billion hedge fund run by Gabriel Plotkin, a former star at SAC Capital, is up nearly 40 percent through the end of October, focusing primarily on consumer stocks. (Reuters)

Fed Chair Janet Yellen has argued for a cautious approach to the pace of interest rate rises in an unusual exchange with U.S. consumer advocate Ralph Nader. (Reuters)

Tiffany (TIF) this morning reported earnings, revenue, and same-store sales . The luxury jeweler also warned about full-year results. The stock was under pressure in the premarket. (CNBC)

Apple (AAPL) plans to launch its Apple Pay electronic payment service in China by early February, after doing deals with that country's four largest state-run banks. (WSJ)

Tesla 's (TSLA) long-awaited Model X has been priced at $80,000 before delivery charges, making the electric crossover $5,000 more than the lowest price version of the Model S sedan. (USA Today)

Google, a unit of Alphabet (GOOGL), has expanded its fleet of financial services this week by offering homebuyers in California the opportunity to compare and contrast mortgages. (CNBC)

With nearly 47 million Americans planning to hit the road or take to the skies this Thanksgiving, meteorologists are warning of travel troubles due to incoming snow and ice in the West and the Plains. (NBC News)