According to Rob Lloyd, the report's lead author, the assessment is a measure of the extent to which organisations have the policies and systems in place to enhance consistent and coherent accountability to the people they affect."
The report ranked GE and GlaxoSmithKline number one and two most transparent and accountable companies.
Tata Group, was however, considered ahead of Coca-Cola, Petrobras, HSBC Holdings, PriceWaterCooopers International and Google, when measured on the parameters of transparency and accountable
leadership among global companies.
The annual Global Accountability Report considered Tata Group at number 10, among the world's 30 most powerful organisations from the inter-governmental, non-governmental and corporate sector, to be accountable to civil society, affected communities and wider public.
Orient-Express Hotels had recently rejected an offer of alliance from Tatas, saying tying up with the "predominantly Indian" hospitality firm will erode the US hospitality chain's brand image. Tata Group's interests range from hotels to steel to salt and software and auto.
One World Trust rated UN Development Programme followed by Asian Development Bank and Christian Aid the most transparent and accountable organisations among world's top 30 organisations.