U.S. stocks tumbled, paring a weekly advance for the Standard & Poor’s 500 Index, after weaker-than- forecast growth in company payrolls added to evidence the economic recovery is slowing. General Electric Co., JPMorgan Chase & Co., and International Business Machines Corp. helped lead declines in the Dow Jones Industrial Average after the Labor Department said private-sector payroll growth in June and July fell short of estimates. EOG Resources Inc. tumbled 4.8 percent after reporting second-quarter earnings that trailed estimates.