U.S. stock index futures suggest a subdued opening to markets on Monday, ahead of a raft of PMI data from Asia, euro zone countries and the U.S., and another round of quarterly earnings reports from U.S. companies.

Futures on the Dow Jones Industrial Average were up 0.03 percent, futures on the Standard & Poor's 500 Index were down 0.02 percent, and those on the Nasdaq 100 index were up 0.06 percent.

Investors are likely to focus on the Institute of Supply Management's nonmanufacturing Purchasing Managers’ Index, or PMI, which will be reported at 10 a.m. EDT Monday.

The index, also known as the ISM Services PMI, which rates the relative level of business conditions, including employment, production, new orders, prices, supplier deliveries and inventories, is expected to increase to 53.0 in July, from 52.3 in June. A level above 50 represents expansion in the industry.

On the earnings front, a number of major companies, including Vornado Realty Trust (NYSE:VNO), Tyson Foods Inc. (NYSE:TSN), Fidelity National Financial Inc. (NYSE:FNF), Stone Energy Corporation (NYSE:SGY), Rockwood Holdings Inc. (NYSE:ROC), Mindray Medical International Limited (NYSE:MR), Macerich Company (NYSE:MAC), Dril-Quip Inc. (NYSE:DRQ), Credicorp Ltd. (NYSE:BAP) Bristow Group Inc. (NYSE:BRS), BanColombia S.A. (NYSE:CIB), Hologic Inc. (NASDAQ:HOLX) and Alleghany Corporation (NYSE:Y) will announce quarterly earnings on Monday.  

In Europe, markets traded higher on Monday after reports showed composite PMI data for the 17-nation euro zone hit a two-year high and entered expansion territory for the first time since January 2012. The final Markit Eurozone PMI rose to 50.5 in July, up from a reading of 48.3 in June.

The Stoxx Europe 600 index was trading up 0.48 percent, London’s FTSE 100 was up 0.21 percent, Germany's DAX-30 was up 0.16 percent, and France's CAC-40 was trading up 0.33 percent. 

In Asia, most markets except those in China traded lower on Monday.

China’s Shanghai Composite index ended up 1.04 percent and Hong Kong’s Hang Seng Index gained 0.17 percent, after an HSBC-Markit survey released on Monday showed that the service sector in the world’s second-largest economy expanded modestly in July.

Elsewhere, Japan’s Nikkei ended down 1.44 percent, Australia’s S&P/ASX 200 ended down 0.11 percent, and South Korea’s KOSPI Composite index lost 0.37 percent.

India’s BSE Sensex ended flat, after trimming initial gains, following a HSBC-Markit survey released Monday showed that its private-sector business activity declined for the first time in more than four years.

The HSBC India Composite Output Index posted 48.4 in July, down from 50.9 in June, while the PMI for the service sector stood at 47.9 in July, down from 51.7 in June -- marking its first contraction since October 2011.  

“Activity in the service sector contracted in July led by a drop in new business, which also led to a decline in optimism among the surveyed companies,” Leif Eskesen, chief economist at HSBC said, in a statement.