BUZZ-Investec: To raise 145 mln stg via placing
** South Africa-focused bank Investec (LSE: INVP.L - news) 's shares among most traded on the FTSE 350 by avg vols, down 2.6 pct, after saying it will raise about 145 mln stg via placing
** Co says cash will be used to fund tender offer for some preference shares
** Placing represents about 5 pct of co's share capital
** Stock bottom of the Stoxx 600 Financial Services Index , which is up 0.1 pct
** About a quarter of co's 30-day avg vols gone through in the first 20 minutes of trade (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)