BUZZ-DS Smith: Berenberg raises to buy
** British packaging materials maker DS Smith (Frankfurt: 877238 - news) up 2.8 pct
** 4-star rated Berenberg raises co to "buy" from "hold"
** Berenberg says the co is too cheap relative to the average stock in broader UK small and mid-cap coverage, and also believes the structure is now in place to build a much larger trans-Atlantic (Shanghai: 600558.SS - news) business on a multi-year view
** Recently announced Interstate acquisition has led brokerage to revisit its rating
** Co said in June it would buy 80 pct of Interstate Resources for $920 mln, giving it an entry into US market
** Raises PT to 550p from 400p
** Stock among top gainers on FTSE midcap index and index