India Inc's overseas direct investment in September 2014 more than doubled from a year ago period to $3.02 billion, the Reserve Bank data showed.
Total investment abroad by Indian firms were at $1.43 billion in September 2013.
In the previous month August, the Indian companies had undertaken investments of $1.25 billion in overseas markets.
The investments were a mix of issuance of guarantees ($2.53 billion), loan ($257.60 million) and of equity ($232.59 million).
Tata Steel, KBC International,
Glenmark Pharmaceuticals, Videcon Industries, and Mercator were among the major investors overseas during the month.
Tata Steel invested $1.88 billion in its wholly-owned unit in Singapore and Mercator made an investment of $45 million in its joint venture in Singapore.
Videocon Industries made an investment of $22.06 million in a wholly owned unit in the Cayman Island, and KEC International $81.3 million in a wholly unit in Mauritius.
Glenmark Pharmaceuticals invested a total of $27.12 million in five separate tranches in its joint ventures and wholly owned subsidiaries in Egypt, Mexico, Nigeria, Venezuela and Switzerland.