ESET is an IT security company from Bratislava with more than 1,000 employees worldwide at present. Their branch offices are in the United States, Ireland, United Kingdom, Argentina, the Czech Republic, Singapore and Poland. In recent years, service and high-tech-oriented businesses have prospered in Bratislava. Many global companies, including IBM, Dell, Lenovo, AT&T, SAP, and Accenture, have built outsourcing and service centres here. Reasons for the influx of multi-national corporations include proximity to Western Europe, skilled labour force and the high density of universities and research facilities. Other large companies and employers with headquarters in Bratislava include Amazon, Slovak Telekom, Orange Slovensko, Slovenská sporiteľňa, Tatra banka, Doprastav, Hewlett-Packard Slovakia, Henkel Slovensko, Slovenský plynárenský priemysel, Microsoft Slovakia, Mondelez Slovakia, Whirlpool Slovakia and Zurich Insurance Group Slovakia.