BUZZ-Petrofac: among top UK mid caps as SocGen raises to "buy"
** Petrofac (Amsterdam: PF6.AS - news) up nearly 7 pct, second largest FTSE midcap gainer after Societe Generale (Swiss: 519928.SW - news) increases rating to "buy" from "hold", cuts PT to 900p from 905p
** SocGen (Paris: FR0000130809 - news) analysts say co's sustained interim dividend and larger backlog make it more resilient than its peers
** Best day for stock in 6 mths
** Peer Hunting fell as much as 7 pct after reporting a 79 pct drop in H1 underlying profit, and cut its dividend in half
** Broader oil & gas sector up 2.6 pct, with Tullow, Premier (NasdaqGS: PINC - news) up more than 7 pct as oil rallies (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)