Payrolls at U.S. companies unexpectedly dropped in September, due at least in part to issues with data analysis.

U.S. stock futures were up Thursday following gains in the prior session supported by ADP figures showing unexpected job losses.

That’s weaker job growth than economists expected. Those surveyed by FactSet estimated that the U.S. private employers would add 50,000 jobs in September. That’s compared to the 54,000 positions that ...