BUZZ-Australia's Henderson Group rises to over 1-month high
** Asset management service provider Henderson Group Plc (LSE: HGG.L - news) rises as much as 2 pct to its highest since April 16
** Morningstar (NasdaqGS: MORN - news) upgrades rating to "hold" from "reduce"
** Stock up 39 pct this year as of Thursday's close, outperforming 26 pct rise in S&P/ASX 200 Diversified Financials Industry index
** Stock top performer on S&P/ASX 200 Diversified Financials Industry index (Reuters messaging: justin.varghese.thomsonreuters.com@reuters.net)