Revenue : $ 23bn Employees : 469,000 + HQ : Mumbai

The second Indian consulting powerhouse on our list , and one of the nation ’ s biggest companies by market cap , Tata Consultancy Services employs close to half a billion professionals worldwide , representing 147 nationalities in 46 countries . A leader in consulting , IT solutions and services , TCS aims to simplify , strengthen and transform its customers ’ business operations . Its expertise currently cover the cutting edge of digital transformation technologies , including AI , cybersecurity and blockchain . TCS is part of the Tata Sons group , which reported combined 2019-20 revenue of £ 106bn .

Revenue : $ 29.22bn Employees : 226,000 + HQ : Amstelveen

The first , but certainly not the last , of the Big Four accounting firms to make this Top 10 , KPMG is one of the world ’ s biggest professional services networks . It specialises in four key service lines : audit and assurance , advisory , tax and legal , and enterprise , operating in 147 countries around the world . The organisation has " a commitment to quality and integrity ”, advising clients on mitigating risk and benefit from rapid transformation and shifts in industry , serving business , governments , publicsector agencies and not-for-profits .