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Markit's flash US service sector PMI came in at 56.3, missing expectations.
Expectations were for Markit's flash reading to come in at 57.3, up slightly from last month's 57.1.
This is the lowest reading for the index since April.
"Weaker service sector output growth largely reflected a moderation in new business gains during November. The latest rise in incoming new work was the slowest for seven months and slightly less marked than the average seen since the survey began in October 2009," according to Markit's release.
Markit added that, "Some survey respondents commented on weaker client confidence and associated delays to the launch of new projects."
Markit's flash reading comes ahead of what is a jam-packed three days for US economic data ahead of the Thanksgiving holiday.
More to come ...