BUZZ- Persimmon: record high on strong margin growth
** Shares (Berlin: DI6.BE - news) in UK's 2nd biggest housebuilder up 3% at a record high
** H1 pre-tax profit rises 30% to £457.4 mln ($589 mln); operating margin up by 380 basis points to 27.6%
** Co says housing market remains "confident" and sees strong cash generation
** "Given the level of H1 margins and that H2 margins are virtually always higher we see a material increase to our margin assumptions for the year", Peel Hunt says
** Stock among top gainers on pan-European STOXX index