(Read More: See the Day's Top Percentage Winners & Losers)
Las Vegas Sands - PriceWaterhouseCoopers resigned as the casino operator's auditor. The company has no disagreements on its financials for 2011, 2012, and the year-to-date for 2013, but said the relationship "has run its course."
JPMorgan Chase - The bank has lost co-chief operating officer, Frank Bisignano, to First Data, where he will become chief executive officer. Matt Zames will become JPMorgan's sole chief operating officer.
TripAdvisor - Barry Diller resigned as a member of its board of directors, effective immediately. However, Diller will act as a special advisor to the company's chief executive officer.
Conceptus - Conceptus will be bought by Germany's Bayer for $1.1 billion, or $31 per share in cash, a 19.7 percent premium over the stock's closing price Friday. Conceptus is a maker of contraceptive devices.
Valeant Pharmaceuticals, Actavis - The two have put a proposed merger on hold, according to Reuters. Valeant was reportedly seeking to buy Actavis for more than $13 billion, but the talks are said to have broken down over proposed terms of the deal.
Boeing - Dreamliner commercial service is back, with Ethiopian Airlines becoming the first to put the 787 back in the air since its grounding earlier this year.
SunTrust Banks - FBR Capital has upgraded the stock to "outperform" from "market perform," citing lower operating expenses and declining credit costs, among other factors.