NEW YORK, July 2 (Reuters) - Citadel's flagship hedge

fund Wellington posted a gain of 8.1% in the first half of the

year, driven by positive performance of all its investment

strategies, a source familiar with the matter said.

In June, the fund was up 0.94%. Ken Griffin's hedge fund,

which had $63 billion in assets in June 1, declined to comment

on the matter, which was first reported by the Financial Times.