Partners Group, a global private markets firm, has agreed to acquire about 75 per cent stake in Atria Convergence Technologies (ACT), one of India's largest providers of high-speed fiber-optic broadband, from Argan (Mauritius) Ltd and TA Associates. Partners Group, which has been a joint investor in ACT since 2016, will acquire a controlling stake in a transaction that values the company at an enterprise value of nearly $1.2 billion, a statement from the Partners Group said. The deal size is learnt to be around $900 million.