Aberdeen Asset Management says to buy U.S. firm Flag Capital Management

* Flag has $6.3 bln in AUM

* Deal would bring Aberdeen’s PE unit to $15 bln AUM

* Flag invests in PE and real assets

Flag managed around $6.3 billion in assets across a range of small-to-mid-cap private equity, and real assets in the United States, as well as private equity in the Asia-Pacific region at end-December, Aberdeen said in a statement.

The deal will take Aberdeen’s private equity unit to roughly $15 billion of assets under management and the broader alternatives platform to $21.3 billion, it added.

Reporting by Simon Jessop of Reuters.