BUZZ-Ashtead: Bottom of the FTSE 100 on United Rentals read-across
** Ashtead's shares down 5.4 pct, bottom of the FTSE 100, after peer United Rentals (NYSE: URI - news) reports quarterly results overnight
** Co's shares often track U.S (Other OTC: UBGXF - news) .-based United Rentals, which fell 9.7 pct aftermarket after missing Q4 market expectations
** Nearly 40 pct of Ashtead's 30-day avg volumes gone through in the first 20 minutes of trade
** Co also second-largest loser on the Stoxx 600 (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)