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Extreme Networks, Inc (NASDAQ:EXTR) (The Motley Fool)
What happened: Shares of networking-hardware maker Extreme Networks (NASDAQ:EXTR) rose as much as 11.5% in Tuesday morning trading. The stock is joining the S&P SmallCap 600 market index before the opening bell on Thursday, replacing Time Inc. (NYSE:TIME), as the magazine and website publisher is being acquired by larger peer Meredith (NYSE:MDP).

GrubHub Inc (NYSE:GRUB) (MarketWatch)
Shares of GrubHub Inc. GRUB, -4.25% fell 3.8% in Tuesday morning trading after analysts at Barclays downgraded the stock to underweight from equal weight. The analysts, led by Deepak Mathivanan, like GrubHub’s prospects in the long run but worry about the stock’s high valuation relative to internet peers and the “incremental competitive risks” brought upon by Uber Technologies Inc.’s and Amazon.com Inc.’s AMZN, +0.66% efforts in food delivery. GrubHub shares have performed better than the S&P 500 Index SPX, -0.95% over the past three months, Mathivanan wrote.

Rambus Inc. (NASDAQ:RMBS) (Benzinga)
Rambus Inc. shares slipped 5.3 percent to $13.45 after reporting weak first-quarter guidance despite delivering a fourth-quarter sales beat. EPS fell in-line with analyst estimates at 19 cents. The company sees a first-quarter adjusted EPS loss between 12 and 19 cents, with sales in the $41 million-$47 million range.

CVS Health Corp (NYSE:CVS) (TheStreet)
The combined forces of Amazon.com Inc. (AMZN) , JPMorgan Chase & Co. (JPM) and Berkshire Hathaway Inc. (BRK.A) to form a technology-driven healthcare solution were enough to make waves on the stock market Tuesday, Jan. 30. But Wall Street may be overreacting, sources told TheStreet following the news, as CVS Health Corp. (CVS) shares have dropped as much as 6%. If anything, insurance companies and pharmacy benefit management (PBM) organizations like Humana Inc. (HUM) , Express Scripts Holding Co. (ESRX) and Cigna Corp. (CI) have more to worry about, according to Oppenheimer analyst Mohan Naidu, because of the proposed partnership’s not-for-profit model.