With Alphabet losing against the U.S. Department of Justice in multiple antitrust cases, the writing may be on the wall for Apple's lucrative deal with the search giant. Apple receives around $20 billion annually from Google to make Google the default search engine on its devices.

When you come upon a winning stock in your portfolio, it’s a good idea to hang onto it and let your shares appreciate in value. Doing so could be a winning formula for your retirement — provided you do that across a diverse mix of stocks.

Bloomberg journalists discuss today's biggest winners and losers in the stock market. Listen for analysis on the companies making news on Wall Street.