| 19 Jan 2011 | SALE | Flagstone Reinsurance Holdings Ltd | 25,000 | 12.57 USD | |
| 08 Dec 2010 | SALE | Flagstone Reinsurance Holdings Ltd | 5,155,156 | 11.48 USD | |
| 08 Dec 2010 | SALE | Flagstone Reinsurance Holdings Ltd | 2,849,868 | 11.48 USD | |
| 08 Dec 2010 | SALE | Flagstone Reinsurance Holdings Ltd | 7,955,553 | 1.70 USD | deriv |
| 28 Jun 2010 | OTHER | Flagstone Reinsurance Holdings Ltd | 225,750 | — | |
| 25 May 2010 | SALE | Flagstone Reinsurance Holdings Ltd | 2,000,000 | 12.00 USD | |
| 22 Mar 2010 | OTHER | Flagstone Reinsurance Holdings Ltd | 131,115 | 0.00 USD | |
| 21 Dec 2009 | OTHER | Flagstone Reinsurance Holdings Ltd | 1,700 | 10.91 USD | |
| 18 Dec 2009 | OTHER | Flagstone Reinsurance Holdings Ltd | 20,000 | 10.79 USD | |
| 17 Dec 2009 | OTHER | Flagstone Reinsurance Holdings Ltd | 22,000 | 10.72 USD | |
| 15 Dec 2009 | OTHER | Flagstone Reinsurance Holdings Ltd | 24,000 | 10.90 USD | |
| 16 Dec 2009 | OTHER | Flagstone Reinsurance Holdings Ltd | 24,000 | 10.84 USD | |
| 12 Nov 2008 | OTHER | Flagstone Reinsurance Holdings Ltd | 523,277 | 0.00 USD | |
| 29 Sept 2008 | OTHER | Flagstone Reinsurance Holdings Ltd | 474,482 | 0.00 USD | |
| 30 Mar 2007 | PURCHASE | Flagstone Reinsurance Holdings Ltd | 50,000 | 13.50 USD | |
| 16 May 2003 | GIFT | WHITE MOUNTAINS INSURANCE GROUP LTD | 25,625 | 0.00 USD | |