LONDON, July 1 (Reuters) - Billionaire investor Cliff Asness's AQR Capital Management finished the first half of the year with positive returns in several of its funds, said a source on Tuesday.

The $142 billion hedge fund returned a positive 0.9% performance in June in its multi-strategy fund, Apex Strategy, with a net 11.4% return so far this year, the source with knowledge of the matter said.

AQR's Helix Strategy which trades equity trends posted an 0.4% return for June and is up 7.4% for the year through June.

But the hedge fund's AQR Delphi Long-Short Equity Strategy June performance declined 2.1% in June, still leaving it with a positive 11.6% half-year return.

(Reporting by Nell Mackenzie; Editing by Dhara Ranasinghe)

((Nell.Mackenzie@thomsonreuters.com;))