* Petershill fund takes stake of between 10-20 pct - source
* LMR Fund Ltd up 2.84 pct in year to Aug. 10 - HSBCBy Maiya KeidanLONDON, Sept 3 (Reuters) - A private equity fund run byGoldman Sachs Asset Management (GSAM) has bought aminority stake in multi-strategy hedge fund firm LMR Partners,one source familiar with the matter said on Monday.The GSAM fund bought a stake of between 10 percent and 20percent in LMR for an undisclosed sum, the source said.A spokesman for LMR Partners, which has offices in London,Hong Kong and New York, declined to comment. A spokesman forGoldman Sachs also declined to comment.LMR Partners, which uses both computer-driven anddiscretionary trading styles, has $5 billion in assets undermanagement, its website said.The GSAM fund is part of its Petershill range of funds,launched in 2007 to take stakes in alternative asset managers.While Petershill I has already closed, GSAM's Petershill II andPetershill PE funds are both still active.The Petershill funds currently has $4.5 billion ofinvestments in alternative asset managers, with previousinvestments including macro hedge fund Caxton Associates,credit-focused Knighthead Capital Management and equity-focusedPelham Capital.Petershill has also previously invested in high-profileBritish quantitative hedge fund firm Winton Group, among others.LMR Partners' $2.7 billion LMR Fund Ltd made gains of 2.8percent in the year to Aug. 10, after returns of 10.2 percent in2017, data compiled by HSBC showed. (Reporting by Maiya Keidan. Editing by Jane Merriman)