WASHINGTON—Manufacturing activity in the U.S. remained robust in July, but slowed somewhat compared with previous months due to supply chain strains, reports the Institute for Supply Management in its latest Manufacturing Report on Business Purchasing Managers' Index.

HOUSTON--U.S. manufacturing sector reported the greatest improvement in overall business conditions since September 2014, while the service sector continues to expand, the IHS Markit's Purchasing Managers' Index showed on Monday.