BUZZ-Henderson: Biggest 2-day gain in six months
** Henderson Group (LSE: HGG.L - news) extends biggest 2-day gain since January after top analysts raise price target
** Co top gainer on FTSE-350 FIN SERV Financial Index , up nearly 3 pct
** Analysts cheer the asset manager's robust first-half earnings reported yesterday
** Jefferies, JPMorgan (LSE: JPIU.L - news) , UBS (NYSEArca: FBGX - news) , Credit Suisse (NYSE: CS - news) and Cantor Fitzgerald all raise PT to as high as 310 p
** YTD stock has risen 30 pct compared vs about 7 pct rise in FTSE-350 FIN SERV Financial Index (aashika.jain@thomsonreuters.com)