TOKYO, Aug 7 (Reuters) - Japanese technology investor SoftBank Group swung to a small net profit of 10.4 billion yen ($70.7 million) in the April-June quarter, helped by buoyant valuations of tech stocks and marking its third consecutive quarter of gains.

It missed expectations of 109 billion yen of profit over the quarter, according to an average of five analyst estimates compiled by LSEG and Reuters. That compares with a loss of 316.2 billion yen in the same period a year earlier.

The Vision Fund investment unit booked an investment gain of 1.9 billion yen.

($1 = 147.0100 yen) (Reporting by Anton Bridge; Editing by David Dolan and Tom Hogue)