The UK's regulatory authority on competition has officially opened an investigation into Microsoft's deal to buy Activision Blizzard. (0:21) Bill Mann discusses: - Why Wall Street is shrugging off the news - What to expect when the decision is announced by September 1st - Amazon's deal to take a small stake in GrubHub - The prospect for more companies (e.g., Salesforce, Atlassian) to take stakes in smaller software companies (11:51) Deidre Woollard talks with Jacob Goldstein about his recent interview with Redfin CEO Glenn Kelman, the 3% commission model, and more. Got a question about stocks? Call the Motley Fool Money Hotline at 703-254-1445. Stocks mentioned: MSFT, ATVI, UBSFY, AMZN, JET, CRM, TEAM, RDFN, ZG Host: Chris Hill Guests: Bill Mann, Deidre Woollard, Jacob Goldstein Producer: Ricky Mulvey Engineers: Dan Boyd, Rick Engdahl