** Persimmon Plc pares gains soon after touching all-time high
** Co reports strong H1 results, robust outlook
** Numis raises 2015 and 2016 pretax profit estimates on better-than-expected margin growth but slashes rating on the stock to "reduce" from "hold"
** "Whilst the company does have good income attractions and strong returns we feel superior value exists elsewhere, Numis says
** Stock top loser on the FTSE-100 Index soon after rising 1.6 pct to 2156 p earlier today. High volumes see more than half a full-day's avg traded
** Co anticipates good autumn selling season after the summer holiday period draws to a close in early Sept (firstname.lastname@example.org)