Enterprise shares boosted ahead of FTSE review Enterprise shares added 4¾ to 98¼p yesterday, boosting the company's chance of entering the FTSE 250, which in turn would lift demand for it shares from tracker funds. FTSE Group will determine the membership of its indices by ranking companies by their market capitalisation at the close tomorrow, with confirmation of the changes on Wednesday. While negotiations over the US "fiscal cliff" have been the primary source of concern for many in the market over the past few days, worries over the Italian economy and political stability came to the fore today. The news that Italian Prime Minister Mario Monti will step down following parliamentary approval of the country's budget sent the country's bond yields climbing, and the FTSE 100 lost ground for much of the session before rallying in the afternoon to close up 7.23 points to 5,921.63. Concern over Europe weighed on banks and insurers in London, which are exposed to the debt crisis through their holdings of sovereign bonds. Aviva eased 6.6 to 359.7p and Barclays dipped 2 to 249.55p. Also among the FTSE 100 fallers was Eurasian Natural Resources Corporation, which unnerved investors with its $550m (£342m) deal to snap up the 49.5pc of Camrose Resources it doesn't already own. Camrose owns copper assets in the Democratic Republic of Congo. Analysts at Deutsche Bank questioned the price of the transaction, highlighting that ENRC acquired its original 50.5pc holding for $175m in 2010, and now "appears to be paying a significant premium" for the remainder. Others were concerned about the extra debt ENRC will take on to complete the deal. Shares in the miner dropped 6.8 to 276.2p, one of the biggest falls on the blue-chip index. Advertising giant WPP was hit by a downgrade to "hold" from "buy" at Deutsche Bank, which forecast organic revenue growth of 1.8pc next year, lower than the company's own guidance of 2pc to 3pc. WPP shares lost 9½ to 860p. Among the FTSE 100 risers was Tate & Lyle, the maker of the sweetener Splenda. Chief executive Javed Ahmed hosted a capital markets day for investors and analysts on Thursday, and yesterday the shares benefited from positive word-of-mouth from the event, which was held at the group's new Commercial and Food Innovation centre in Chicago. Shore Capital was impressed by the centre and said it demonstrated Tate's commitment to focusing on speciality food ingredients. Meanwhile, analysts at Canaccord Genuity were struck by the calibre of the group's mid-level management, "as well as the company's willingness to provide access to them throughout the event." The upbeat message from analysts helped Tate shares advance 10 to 769p, one of the day's best performing blue-chips. Elsewhere, one trader heard vague takeover speculation around oil and gas services group Petrofac, which advanced 20p to £17.06. The shares have gained about 5pc since the start of the month and today hit their highest level since May. On the FTSE 250 - down 9.41 points at 12,178.15 - AZ Electronic Materials was hurt by questions over its valuation and ended the day as the heaviest faller on the mid-cap index. "We continue to like the fundamentals of the AZ investment case but we feel currently much of this is being priced in," said UBS, which cut its recommendation on the company to "neutral" from "buy." The shares dropped 16.6 to 363.7p as a result. The announcement that Ken McMeikan, chief executive of Greggs, is leaving the baker pushed the shares down 14 to 472½p. Shore Capital noted that Mr McMeikan was "the architect of a material modernisation" of the group. News of the departure of Man Group's CEO had the opposite effect. Man shares advanced 3.65 to 77.3p after the troubled hedge fund manager confirmed Peter Clarke will step down in February, to be replaced by the company's chief operating officer, Manny Roman. However, it was Egyptian gold miner Centamin that topped the FTSE 250 with an increase of 4.95 to 54.9p, rebounding from the 49.95p the shares closed at on Friday, the lowest since March 2009. Political instability in the country has weighed on the group in recent days. Finally, confirmation from Pace that it was bidding for television set-top box maker Motorola Home, owned by Google, saw shares in the technology group suspended from trading. They fell 6.5 to 185.3p before dealings were halted.