MUMBAI: The brand value of the country's largest software exporter TCS grew to $8.7 billion in 2015, clipping at a growth of 271% from $2.3 billion in 2010, making it the fastest growing software brand in the world over the past five years. With this, the Tata Group flagship retains the IT industry's highest brand strength rating of AA+, and cements position as one of the top global brands in the industry, TCS said in a statement, quoting Brand Finance, issued from London and Mumbai.