U.S. stock futures signaled a flat market open on Monday at the start of a busy earnings week, which was coupled with reports of merger and acquisition activity. Copier and printer maker Xerox Corp. on Monday said second-quarter profit rose sharply, boosted by a tax benefit. Meanwhile, package delivery company United Parcel Service Inc. is set to make an acquisition in Britain, the Financial Times newspaper reported on Monday. Motorola Inc. rose 4.3 percent to $20.85 before the opening bell on the Inet electronic brokerage system after financial weekly Barron's said the mobile phone maker's shares could climb an additional 25 percent as it unveils new gadgets. S&P 500 futures fell 0.9 point, slightly above their fair value, a mathematical formula that evaluates their pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures were down 9 points, while Nasdaq 100 futures were down 1 point.