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Under Armour Inc (NYSE:UA) (MarketWatch)
Under Armour Inc. shares UA, +13.28% UAA, +14.85% surged 13% in premarket trade Tuesday, after the company posted stronger-than-expected revenue for the fourth quarter. The company said it had a net loss of $87.9 million, or 20 cents a share, in the quarter, after earnings of $103.2 million, or 23 cents a share, in the year-earlier period. Adjusting for a one-time tax charge and restructuring costs, the company had breakeven EPS, matching the FactSet consensus. Revenue came to $1.4 billion, beating the FactSet consensus of $1.3 billion.

Generac Holdings Inc. (NYSE:GNRC) (CNBC)
Generac – The maker of power generators earned an adjusted $1.37 per share for the fourth quarter, beating the $1.19 a share consensus estimate. Revenue also topped forecasts, with shipments of home standby generators near record levels thanks to elevated power outage activity.

Henry Schein, Inc. (NASDAQ:HSIC) (The Motley Fool)
What happened: Shares of Henry Schein (NASDAQ:HSIC), a maker of dental and veterinary products, fell as much as 13% in early morning trading on Tuesday as a result of accusations leveled against the company for breaking antitrust rules. The stock has since recovered but is still down about 10% as of 11:05 a.m. EST. So what: On Monday night, it was reported that the Federal Trade Commission has filed a complaint against the three largest U.S. dental supply companies in the country — Benco Dental Supply, Henry Schein, and Patterson Companies (NASDAQ:PDCO) — for running afoul of antitrust law.

Dare Bioscience Inc (NASDAQ:DARE) (Benzinga)
Dare Bioscience Inc shares tumbled 39.8 percent to $1.68. Dare Bioscience priced 5 million common share and warrants to buy up to 3.5 million common shares at $3 per share.

AmerisourceBergen Corp. (NYSE:ABC) (Reuters)
(Reuters) – Walgreens’ potential deal for drug distributor AmerisourceBergen will boost its cash flow and push it deeper into a lucrative specialty pharmacy market, but may fail to keep it competitive in an evolving U.S. healthcare sector, analysts said. A deal would not be a surprise, but analysts noted that it might cost Walgreens Boots Alliance opportunities down the line as the company tries to keep pace with rival CVS Health Corp, which is set to buy health insurer Aetna Inc, and possibly go up against Amazon.com. AmerisourceBergen shares were up 8.7 percent in midday trading, while Walgreens shares were little changed.