BUZZ — Varonis rises after Proofpoint agrees to $6.3 bln takeover

* Shares of Varonis Systems rise 2.4% to $48.50 premarket * Private equity Thoma Bravo-owned Proofpoint said to buy the data security firm in $6.3 bln all-cash deal * Offer values VRNS at $49.75/share — 52% premium over close on June 22, the day before speculation about possible sale emerged * Deal expected to close in H127 * Nine of 22 brokerages rate stock "buy" or higher, 13 "hold"; median PT: $50 * As of last close, stock up 44.3% YTD (Reporting by Anand Gopal in Bengaluru) ((AnandGopal.R@thomsonreuters.com)