Exhibit 99.1

FOR IMMEDIATE RELEASE

ALLIED WORLD REPORTS STRONG FULL YEAR 2012 RESULTS WITH 15.6% GROWTH IN

DILUTED BOOK VALUE PER SHARE

Gross Premiums Written up 20.1% for Full Year 2012

ZUG, SWITZERLAND, FEBRUARY 13, 2013—Allied World Assurance Company Holdings, AG (NYSE: AWH) today reported a net loss of $41.1 million, or $1.17 per diluted share, for the fourth quarter of 2012 compared to net income of $183.1 million, or $4.63 per diluted share, for the fourth quarter of 2011. Net income for the year ended December 31, 2012 was $493.0 million, or $13.30 per diluted share, compared to net income of $274.5 million, or $6.92 per diluted share, for the year ended December 31, 2011.

The company reported an operating loss of $55.4 million, or $1.58 per diluted share, for the fourth quarter of 2012 compared to operating income of $94.7 million, or $2.40 per diluted share, for the fourth quarter of 2011. Operating income for the year ended December 31, 2012 was $202.7 million, or $5.47 per diluted share, compared to operating income of $183.7 million, or $4.63 per diluted share, for the year ended December 31, 2011.

President and Chief Executive Officer Scott Carmilani commented, “Allied World had a strong year in 2012. While Superstorm Sandy tempered our fourth quarter underwriting results, we still generated $493 million of net income for the full year, continuing to build value for our shareholders. Our diluted book value per share grew by over 15% in 2012, to $92.59. The company’s top line production grew by 20% to $2.3 billion in gross premiums written for the year, and we were able to achieve targeted growth in all three of our business segments.”

Mr. Carmilani added, “Our company continues to capitalize on our various book value drivers including our expanded breadth and diversity of underwriting platforms, strong investment acumen, responsible reserving and capital management flexibility. I believe these strengths have Allied World well positioned as we move into 2013 and beyond.”

Underwriting Results

Gross premiums written were $497.1 million in the fourth quarter of 2012, a 19.3% increase compared to $416.5 million in the fourth quarter of 2011. For the year ended December 31, 2012, gross premiums written totaled $2,329.3 million, a 20.1% increase compared to $1,939.5 million for the year ended December 31, 2011. Net premiums written were $362.6 million in the fourth quarter of 2012, an 18.2% increase compared to $306.8 million in the fourth quarter of 2011. For the year ended December 31, 2012, net premiums written totaled $1,837.8 million, a 19.8% increase compared to $1,533.8 million for the year ended December 31, 2011.

 

1


The following information was filed by Allied World Assurance Co Holdings, Ag on Wednesday, February 13, 2013 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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