The central bank, as part of its intervention strategy, had been offsetting its dollar purchases in the spot market, by entering into sell-buy swaps in the forwards markets. That had swelled its forwards book to over long $70 billion, causing dollar/rupee forward premiums to spike and foreign banks to book arbitrage gains from the trade earlier this year.
Indian entities were net buyers of almost $3 billion worth of Treasuries over April and May, according to U.S. government data, the first inflows from the South Asian nation since October.
The biggest beneficiaries of the swap trades have been overseas lenders in India, which have easy access to large dollar investments, the people said. An email to the RBI was unanswered.