LONDON (Dow Jones)--Bermuda-based insurer Lancashire Holdings Ltd. (LRE.LN) said it has entered into an arrangement with Macquarie Capital (Europe) Ltd to buy back its shares on its behalf as part of its repurchase program. In May shareholders backed the insurer's plan to buy up to 18,250,306 of its shares as part of its buyback plan to boost its shares' liquidity. Since May 4, Lancashire has bought back 4,382,479 shares under the repurchase program. -By Rachael Gormley, Dow Jones Newswires; 44-20-7842-9308; [email protected] (END) Dow Jones Newswires June 10, 2010 02:29 ET (06:29 GMT)