RTRS - QATAR HOLDING CONSIDERING TALKS OVER STRATEGIC PARTNERSHIPS AIMED AT BOOSTING LAGARDERE'S LONG-TERM VALUE -AMF FILINGRTRS - QATAR HOLDING LLC HAS GONE OVER 15 PCT THRESHOLD IN VOTING RIGHTS IN LAGARDERE LAGA.PA , HOLDS 13 PCT OF CAPITAL - AMF FILINGRTRS - QATAR HOLDING LLC COULD INCREASE STAKE IN LAGARDERE LAGA.PA , HAS NO PLANS TO GAIN CONTROL OF LAGARDERE - AMF FILING