They had invested $2.07 billion in their overseas ventures in June last year.
In previous month, May 2017, the investment figure stood at $1.26 billion.
The investments made last month were a mix of issuance of guarantees ($370.11 million), loans (178.80 million) and equity ($568.34 million).
The prominent investors overseas in June included Indian Oil, investing a combined $284.28 million in a joint venture and fully owned subsidiary in Mayanmar and Singapore respectively.
ONGC Videsh Ltd (OVL) invested $118.68 million in a host of joint ventures and fully owned units in various locations.
Motherson Sumi System pumped in $89.30 million in a joint venture in the UK.
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