Allied World Reports 62% Increase in Second Quarter 2010 Net Income; 9.4% Year to Date Increase in Diluted Book Value Per Share

By Allied World Assurance Company Holdings Ltd, PRNE
Wednesday, August 4, 2010

PEMBROKE, Bermuda, August 5, 2010 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) today reported
net income of $184.0 million, or $3.47 per diluted share, for the second
quarter of 2010 compared to net income of $113.7 million, or $2.22 per
diluted share, for the second quarter of 2009. Net income for the six months
ended June 30, 2010 was $317.7 million, or $5.98 per diluted share, compared
to net income of $245.1 million, or $4.79 per diluted share, for the first
six months of 2009.

The company reported operating income of $95.7 million, or $1.80 per
diluted share, for the second quarter of 2010 compared to operating income of
$112.8 million, or $2.20 per diluted share, for the second quarter of 2009.
Weather-related losses as well as the impact of a mine collapse reduced
operating income by $30.0 million, or $0.57 cents per diluted share, in the
second quarter of 2010. Operating income for the six months ended June 30,
2010
was $157.0 million, or $2.96 per diluted share, compared to operating
income of $250.4 million, or $4.89 per diluted share, for the first six
months of 2009.

President and Chief Executive Officer Scott Carmilani commented, "We are
very pleased with the company's profitable results for the first half of the
year despite the impact of unprecedented industry loss activity and the
increasingly competitive pricing environment. Our profitable results continue
to be driven by our strong investment portfolio and our historically prudent
and responsible underwriting philosophy. Our ability to generate $318 million
in net income through the first half of the year, combined with our share
repurchase initiative, has resulted in the company's diluted book value
increasing to over $65 per share, up over 9% from the beginning of the year."

Mr. Carmilani continued, "I am also very pleased that during the quarter
we were able to announce our establishment of Syndicate 2232 at Lloyd's of
London. This is another important accomplishment for our company as we expand
our global reach."

Underwriting Results

Gross premiums written were $493.8 million in the second quarter of 2010,
a 0.2% increase compared to $492.8 million in the second quarter of 2009. For
the six months ended June 30, 2010, gross premiums written totaled $998.0
million
, a 2.6% increase compared to $972.4 million in the first six months
of last year. These increases were primarily due to new business written in
our reinsurance and U.S. insurance segments offset by the non-renewal of
business that did not meet our underwriting requirements due to inadequate
pricing and/or terms and conditions.

Net premiums written were $369.8 million in the second quarter of 2010, a
2.3% increase compared to $361.4 million in the second quarter of 2009. For
the six months ended June 30, 2010, net premiums written totaled $803.1
million
, a 4.8% increase compared to $766.5 million in the first six months
of 2009. These increases in net premiums written were primarily due to higher
gross premiums written as well as a reduction of premiums ceded.

The combined ratio was 87.0% in the second quarter of 2010 compared to
82.8% in the second quarter of 2009. The loss and loss expense ratio was
55.7% in the second quarter of 2010 compared to 53.3% in the second quarter
of 2009. During the second quarter of 2010, the company recorded net
favorable reserve development on prior loss years of $64.1 million, a benefit
of 18.9 percentage points to the company's loss and loss expense ratio for
the quarter. This compares to the second quarter of 2009, where the company
recorded net favorable reserve development on prior loss years of $36.6
million
, a benefit of 11.0 percentage points to the company's loss and loss
expense ratio for that quarter. Absent prior year reserve adjustments, the
loss and loss expense ratio for the second quarter of 2010 was 74.6%. This
ratio was impacted by $30.0 million of losses, or 8.9 percentage points, from
weather-related losses and a mine collapse.

For the six months ended June 30, 2010, the combined ratio was 93.1%
compared to 79.0% in the first six months of 2009. The loss and loss expense
ratio for the six months ended June 30, 2010 was 62.1% compared to 49.6% for
the six months ended June 30, 2009. For the first six months of 2010, the
company recorded net favorable reserve development on prior loss years of
$138.1 million. This net favorable reserve development benefited the
company's loss and loss expense ratio by 20.2 points after adjusting for the
impact of a commutation recorded during the six months ended June 30, 2010.
This compares to the first six months of 2009, where the company recorded net
favorable reserve development on prior loss years of $96.8 million, a benefit
of 14.7 percentage points to the company's loss and loss expense ratio for
the first half of 2009. Absent the favorable reserve development, the loss
and loss expense ratio related to the current loss year was 82.3%. This ratio
was impacted by $116.5 million, or 17.2 percentage points, from loss events
during the first half of 2010 including $65.0 million from the earthquake in
Chile and $51.5 million from other events.

The company's expense ratio was 31.3% for the second quarter of 2010
compared to 29.5% for the second quarter of 2009. The expense ratio was 31.0%
for the six months ended June 30, 2010 compared to 29.4% in the first six
months of 2009. These increases were primarily due to increases in our
overall staff count and related increases in incentive compensation expenses.

Investment Results

The total return on the company's investment portfolio for the three and
six months ended June 30, 2010 was approximately 2.0% and 3.9%, respectively.
Net investment income in the second quarter of 2010 was $65.6 million, a
decrease of 14.3% from the $76.5 million of net investment income in the
second quarter of 2009. For the six months ended June 30, 2010, net
investment income was $134.5 million, a decrease of 12.9% from the $154.4
million
of net investment income in the first six months of 2009. These
decreases were primarily the result of lower reinvestment yields on our fixed
maturity securities and an increased allocation to hedge funds, which
contribute to our total return but carry no current yield. Annualized book
yield for the second quarter of 2010 was 3.6%, versus the annualized book
yield of 4.4% in the second quarter of 2009.

The company recorded net realized investment gains of $94.9 million and
$172.4 million for the three and six months ended June 30, 2010. As of June
30, 2010
and December 31, 2009, net accumulated unrealized gains were $138.2
million
and $149.8 million, respectively.

Shareholders' Equity

As of June 30, 2010, our total shareholders' equity was $3.5 billion, a
7.9% increase compared to $3.2 billion as of December 31, 2009, primarily
driven by strong investment returns.

The company's annualized net income return on average shareholders'
equity for the three and six months ended June 30, 2010 was 22.5% and 19.9%,
respectively. The company's annualized operating return on average
shareholders' equity for the three and six months ended June 30, 2010 was
11.7% and 9.8%, respectively.

Share Repurchase Program

As of June 30, 2010, diluted book value per share was $65.18, an increase
of 9.4% compared to $59.56 as of December 31, 2009. During the second quarter
of 2010, the company announced a $500 million share repurchase program and,
for the quarter, repurchased 1,081,041 of its common shares in the open
market at an average repurchase price of $45.41 per share for an aggregate
cost of $49.1 million.

Quarterly Dividend

Allied World announced today that its Board of Directors has declared a
quarterly dividend of $0.20 per common share. The dividend will be payable on
September 9, 2010 to shareholders of record on August 24, 2010.

Investment Supplement

Allied World will be providing additional information on its investment
portfolio as of June 30, 2010. This information will be available at the
"Investor Relations" section of the company's website at www.awac.com.

Financial Supplement

A financial supplement relating to the second quarter of 2010 will be
available at the "Investor Relations" section of the company's website at
www.awac.com.

Conference Call

Allied World will host a conference call on Friday, August 6, 2010 at
8:00 a.m. (Eastern Time) to discuss the second quarter 2010 financial
results. The public may access a live webcast of the conference call at the
"Investor Relations" section of the company's website at www.awac.com.
In addition, the conference call can be accessed by dialing +1-866-843-0890
(U.S. and Canada callers) or +1-412-317-9250 (international callers) and
entering the passcode 7313881 approximately ten minutes prior to the call.

Following the conclusion of the presentation, a replay of the call will
be available through Friday, August 20, 2010 by dialing +1-877-344-7529 (U.S.
and Canada callers) or +1-412-317-0088 (international callers) and entering
the passcode 442249. In addition, the webcast will remain available online
through Friday, August 20, 2010 at www.awac.com.

Non-GAAP Financial Measures

In presenting the company's results, management has included and
discussed in this press release certain non generally accepted accounting
principles ("non-GAAP") financial measures within the meaning of Regulation G
as promulgated by the U.S. Securities and Exchange Commission. Management
believes that these non-GAAP measures, which may be defined differently by
other companies, better explain the company's results of operations in a
manner that allows for a more complete understanding of the underlying trends
in the company's business. However, these measures should not be viewed as a
substitute for those determined in accordance with generally accepted
accounting principles ("U.S. GAAP").

"Operating income" is an internal performance measure used in the
management of the company's operations and represents after-tax operational
results excluding, as applicable, net realized investment gains or losses,
net impairment charges recognized in earnings, impairment of intangible
assets and foreign exchange gain or loss. The company excludes net realized
investment gains or losses, net impairment charges recognized in earnings and
net foreign exchange gain or loss from the calculation of operating income
because the amount of these gains or losses is heavily influenced by and
fluctuates in part according to the availability of market opportunities and
other factors. The company excludes impairment of intangible assets as these
are non-recurring charges. The company believes these amounts are largely
independent of our business and underwriting process and including them
distorts the analysis of trends in operations. In addition to presenting net
income determined in accordance with U.S. GAAP, the company believes that
showing operating income enables investors, analysts, rating agencies and
other users of the company's financial information to more easily analyze our
results of operations in a manner similar to how management analyzes
underlying business performance. Operating income should not be viewed as a
substitute for U.S. GAAP net income.

The company has included "diluted book value per share" because it takes
into account the effect of dilutive securities; therefore, the company
believes it is an important measure of calculating shareholder returns.

"Annualized net income return on average shareholders' equity" ("ROAE")
is calculated using average shareholders' equity, excluding the average after
tax unrealized gains (or losses) on investments. Unrealized gains (losses) on
investments are primarily the result of interest rate and risk premium
movements and the resultant impact on fixed income securities. Such gains
(losses) are not related to management actions or operational performance,
nor are they likely to be realized. Therefore, the company believes that
excluding these unrealized gains (losses) provides a more consistent and
useful measurement of operating performance, which supplements GAAP
information. In calculating ROAE, the net income (loss) available to
shareholders for the period is multiplied by the number of such periods in a
calendar year in order to arrive at annualized net income (loss) available to
shareholders. The company presents ROAE as a measure that is commonly
recognized as a standard of performance by investors, analysts, rating
agencies and other users of its financial information.

"Annualized operating return on average shareholders' equity" is
calculated using operating income (as defined above and annualized in the
manner described for net income (loss) available to shareholders under ROAE
above), and average shareholders' equity, excluding the average after tax
unrealized gains (losses) on investments. Unrealized gains (losses) are
excluded from equity for the reasons outlined in the annualized net income
return on average shareholders' equity explanation above.

Reconciliations of these financial measures to their most directly
comparable GAAP measures are included in the attached tables.

About Allied World Assurance Company

Allied World Assurance Company Holdings, Ltd, through its subsidiaries,
is a global provider of innovative property, casualty and specialty insurance
and reinsurance solutions, offering superior client service through offices
in Bermuda, Europe, Hong Kong, Singapore and the United States. Our insurance
and reinsurance subsidiaries are rated A (Excellent) by A.M. Best Company.
For further information on Allied World, please visit our website at
www.awac.com.

Cautionary Statement Regarding Forward-Looking Statements

Any forward-looking statements made in this press release reflect our
current views with respect to future events and financial performance and are
made pursuant to the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. Such statements involve risks and
uncertainties, which may cause actual results to differ materially from those
set forth in these statements. For example, our forward-looking statements
could be affected by pricing and policy term trends; increased competition;
the impact of acts of terrorism and acts of war; greater frequency or
severity of unpredictable catastrophic events; negative rating agency
actions; the adequacy of our loss reserves; the company or its subsidiaries
becoming subject to significant income taxes in the United States or
elsewhere; changes in regulations or tax laws; changes in the availability,
cost or quality of reinsurance or retrocessional coverage; adverse general
economic conditions; and judicial, legislative, political and other
governmental developments, as well as management's response to these factors,
and other factors identified in our filings with the U.S. Securities and
Exchange Commission. You are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date on which they are
made. We are under no obligation (and expressly disclaim any such obligation)
to update or revise any forward-looking statement that may be made from time
to time, whether as a result of new information, future developments or
otherwise.

    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
     (Expressed in thousands of United States dollars, except share and
      per share amounts)

                                                   Quarter Ended June 30,
                                                     2010          2009
                                                     ----          ----

    Revenues:
      Gross premiums written                     $493,847      $492,782
      Premiums ceded                             (124,052)     (131,344)
                                                 --------      --------

      Net premiums written                        369,795       361,438
      Change in unearned premiums                 (30,871)      (27,770)
                                                  -------       -------
      Net premiums earned                         338,924       333,668

      Net investment income                        65,594        76,537
      Net realized investment gains                94,933         5,093
      Net impairment charges recognized in
       earnings                                         -        (5,474)
      Other income                                    616           369
                                                      ---           ---
      Total revenue                               500,067       410,193
                                                  -------       -------
    Expenses:
      Net losses and loss expenses                188,722       177,719
      Acquisition costs                            37,938        36,963
      General and administrative expenses          68,089        61,495
      Amortization and impairment of
       intangible assets                              891         1,065
      Interest expense                              9,531         9,522
      Foreign exchange loss (gain)                    559        (1,222)
                                                      ---        ------
      Total expenses                              305,730       285,542
                                                  -------       -------
    Income before income taxes                    194,337       124,651
      Income tax expense                           10,378        10,981
                                                   ------        ------
    NET INCOME                                   $183,959      $113,670
                                                 ========      ========

    PER SHARE DATA:
      Basic earnings per share                      $3.66         $2.30
      Diluted earnings per share                    $3.47         $2.22

      Weighted average common shares
       outstanding                             50,222,974    49,523,459
      Weighted average common shares and
       common share equivalents outstanding    52,974,410    51,257,887

      Dividends declared per share                  $0.20         $0.18

                                                  Six Months Ended June 30,
                                                     2010          2009
                                                     ----          ----

    Revenues:
      Gross premiums written                        $998,010      $972,379
      Premiums ceded                                (194,923)     (205,903)
                                                    --------      --------

      Net premiums written                           803,087       766,476
      Change in unearned premiums                   (125,839)     (108,836)
                                                    --------      --------
      Net premiums earned                            677,248       657,640

      Net investment income                          134,496       154,391
      Net realized investment gains                  172,420        41,695
      Net impairment charges recognized in
       earnings                                         (168)      (47,437)
      Other income                                       913           835
                                                         ---           ---
      Total revenue                                  984,909       807,124
                                                     -------       -------
    Expenses:
      Net losses and loss expenses                   420,876       326,216
      Acquisition costs                               78,722        74,091
      General and administrative expenses            131,552       118,860
      Amortization and impairment of
       intangible assets                               1,783         2,130
      Interest expense                                19,059        19,969
      Foreign exchange loss (gain)                     1,635          (387)
                                                       -----          ----
      Total expenses                                 653,627       540,879
                                                     -------       -------
    Income before income taxes                       331,282       266,245
      Income tax expense                              13,583        21,167
                                                      ------        ------
    NET INCOME                                      $317,699      $245,078
                                                    ========      ========

    PER SHARE DATA:
      Basic earnings per share                         $6.34         $4.96
      Diluted earnings per share                       $5.98         $4.79

      Weighted average common shares
       outstanding                                50,123,945    49,386,549
      Weighted average common shares and
       common share equivalents outstanding       53,086,708    51,215,808

      Dividends declared per share                     $0.40         $0.36
    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
     (Expressed in thousands of United States dollars, except share and
      per share amounts)

                                                             As of
                                                            June 30,
                                                              2010
                                                              ----
    ASSETS:
    Fixed maturity investments available for sale, at
     fair value (amortized cost: 2010: $2,602,000;
     2009: $4,260,844)                                    $2,755,934
    Fixed maturity investments trading, at fair value      4,275,893
    Other invested assets trading, at fair value             388,761
                                                             -------

    Total investments                                      7,420,588
    Cash and cash equivalents                                543,895
    Insurance balances receivable                            552,330
    Prepaid reinsurance                                      202,107
    Reinsurance recoverable                                  932,435
    Accrued investment income                                 46,105
    Net deferred acquisition costs                           103,286
    Goodwill                                                 268,376
    Intangible assets                                         58,576
    Net balances receivable on purchases and sales of
     investments                                                   -
    Net deferred tax assets                                   14,170
    Other assets                                              48,182
                                           Total assets  $10,190,050
                                                         -----------

    LIABILITIES:
    Reserve for losses and loss expenses                  $4,920,435
    Unearned premiums                                      1,069,956
    Reinsurance balances payable                             137,790
    Net balances payable on purchases and sales of
     investments                                              26,107
    Senior notes                                             498,984
    Accounts payable and accrued liabilities                  68,235
                                      Total liabilities   $6,721,507
                                                          ----------

    SHAREHOLDERS' EQUITY:
    Common shares, par value $0.03 per share  (2010:
     50,488,342; 2009: 49,734,487 shares issued and
     2010: 49,407,301;  2009: 49,734,487 shares
     outstanding)                                             $1,515
    Additional paid-in capital                             1,378,262
    Treasury shares, at cost (2010: 1,081,041, 2009:
     nil)                                                    (49,089)
    Retained earnings                                      1,999,610
    Accumulated other comprehensive income, net of tax       138,245
                                                             -------
                         Total shareholders' equity       $3,468,543
                                                          ----------

             Total liabilities and shareholders' equity  $10,190,050
                                                         ===========

                                                                   As of
                                                                December 31,
                                                                    2009
                                                                    ----
    ASSETS:
    Fixed maturity investments available for sale, at
     fair value (amortized cost: 2010: $2,602,000;
     2009: $4,260,844)                                           $4,427,072
    Fixed maturity investments trading, at fair value             2,544,322
    Other invested assets trading, at fair value                    184,869
                                                                    -------

    Total investments                                             7,156,263
    Cash and cash equivalents                                       379,751
    Insurance balances receivable                                   395,621
    Prepaid reinsurance                                             186,610
    Reinsurance recoverable                                         919,991
    Accrued investment income                                        53,046
    Net deferred acquisition costs                                   87,821
    Goodwill                                                        268,376
    Intangible assets                                                60,359
    Net balances receivable on purchases and sales of
     investments                                                        184
    Net deferred tax assets                                          21,895
    Other assets                                                     67,566
                                           Total assets          $9,597,483
                                                                 ----------

    LIABILITIES:
    Reserve for losses and loss expenses                         $4,761,772
    Unearned premiums                                               928,619
    Reinsurance balances payable                                    102,837
    Net balances payable on purchases and sales of
     investments                                                          -
    Senior notes                                                    498,919
    Accounts payable and accrued liabilities                         92,041
                                      Total liabilities          $6,384,188
                                                                 ----------

    SHAREHOLDERS' EQUITY:
    Common shares, par value $0.03 per share  (2010:
     50,488,342; 2009: 49,734,487 shares issued and
     2010: 49,407,301;  2009: 49,734,487 shares
     outstanding)                                                    $1,492
    Additional paid-in capital                                    1,359,934
    Treasury shares, at cost (2010: 1,081,041, 2009:
     nil)                                                                 -
    Retained earnings                                             1,702,020
    Accumulated other comprehensive income, net of tax              149,849
                                                                    -------
                             Total shareholders' equity          $3,213,295
                                                                 ----------

             Total liabilities and shareholders' equity          $9,597,483
                                                                 ==========
    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED CONSOLIDATED SEGMENT DATA
     (Expressed in thousands of United States dollars, except for ratio
      information)

                              U.S.     International
    Quarter Ended
     June 30, 2010         Insurance     Insurance    Reinsurance   Total
    ------------------     ---------     ---------    -----------   -----

    Gross premiums
     written                $189,663       $167,601      $136,583  $493,847
    Net premiums written     135,238         98,509       136,048   369,795
    Net premiums earned      125,659         89,427       123,838   338,924
    Other income                 616              -             -       616
    Net losses and loss
     expenses                (69,198)       (64,580)      (54,944) (188,722)
    Acquisition costs        (15,854)            66       (22,150)  (37,938)
    General and
     administrative
     expenses                (30,683)       (22,657)      (14,749)  (68,089)
                             -------        -------       -------   -------
    Underwriting income       10,540          2,256        31,995    44,791
    Net investment income                                            65,594
    Net realized
     investment gains                                                94,933
    Net impairment
     charges recognized
     in earnings                                                          -
    Amortization and
     impairment of
     intangible assets                                                 (891)
    Interest expense                                                 (9,531)
    Foreign exchange loss                                              (559)
                                                                       ----
    Income before income
     taxes                                                         $194,337
                                                                   ========

    GAAP Ratios:
    Loss and loss expense
     ratio                      55.1%          72.2%         44.4%     55.7%
    Acquisition cost
     ratio                      12.6%         (0.1%)         17.9%     11.2%
    General and
     administrative
     expense ratio              24.4%          25.3%         11.9%     20.1%
    Combined ratio              92.1%          97.4%         74.2%     87.0%
                                ====           ====          ====      ====

                              U.S.     International
    Quarter Ended
     June 30, 2009         Insurance     Insurance    Reinsurance   Total
    ------------------     ---------     ---------    -----------   -----

    Gross premiums
     written                $182,712       $191,985      $118,085  $492,782
    Net premiums written     127,469        116,170       117,799   361,438
    Net premiums earned      111,025        111,807       110,836   333,668
    Other income                 369              -             -       369
    Net losses and loss
     expenses                (46,842)       (74,101)      (56,776) (177,719)
    Acquisition costs        (13,543)        (1,667)      (21,753)  (36,963)
    General and
     administrative
     expenses                (29,996)       (19,914)      (11,585)  (61,495)
                             -------        -------       -------   -------
    Underwriting income       21,013         16,125        20,722    57,860
    Net investment income                                            76,537
    Net realized
     investment gains                                                 5,093
    Net impairment
     charges recognized
     in earnings                                                     (5,474)
    Amortization and
     impairment of
     intangible assets                                               (1,065)
    Interest expense                                                 (9,522)
    Foreign exchange gain                                             1,222
                                                                      -----
    Income before income
     taxes                                                         $124,651
                                                                   ========

    GAAP Ratios:
    Loss and loss expense
     ratio                      42.2%          66.3%         51.2%     53.3%
    Acquisition cost
     ratio                      12.2%           1.5%         19.6%     11.1%
    General and
     administrative
     expense ratio              27.0%          17.8%         10.5%     18.4%
                                ----           ----          ----      ----
    Combined ratio              81.4%          85.6%         81.3%     82.8%
                                ====           ====          ====      ====
    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED CONSOLIDATED SEGMENT DATA
     (Expressed in thousands of United States dollars, except for ratio
      information)

                            U.S.       International
    Six Months Ended
     June 30, 2010        Insurance      Insurance    Reinsurance  Total
    ----------------      ---------      ---------    -----------  -----

    Gross premiums
     written               $351,748       $289,023     $357,239  $998,010
    Net premiums
     written                266,793        179,590      356,704   803,087
    Net premiums earned     254,864        176,470      245,914   677,248
    Other income                913              -            -       913
    Net losses and loss
     expenses              (167,623)      (122,029)    (131,224) (420,876)
    Acquisition costs       (32,814)             -      (45,908)  (78,722)
    General and
     administrative
     expenses               (57,797)       (44,502)     (29,253) (131,552)
                            -------        -------      -------  --------
    Underwriting (loss)
     income                  (2,457)         9,939       39,529    47,011
    Net investment
     income                                                       134,496
    Net realized
     investment gains                                             172,420
    Net impairment
     charges recognized
     in earnings                                                     (168)
    Amortization and
     impairment of
     intangible assets                                             (1,783)
    Interest expense                                              (19,059)
    Foreign exchange
     loss                                                          (1,635)
                                                                   ------
    Income before
     income taxes                                                $331,282
                                                                 ========

    GAAP Ratios:
    Loss and loss
     expense ratio             65.8%          69.1%        53.4%     62.1%
    Acquisition cost
     ratio                     12.9%           0.0%        18.7%     11.6%
    General and
     administrative
     expense ratio             22.7%          25.2%        11.9%     19.4%
    Combined ratio            101.4%          94.3%        84.0%     93.1%
                              =====           ====         ====      ====

                            U.S.       International
    Six Months Ended
     June 30, 2009        Insurance      Insurance    Reinsurance  Total
    ----------------      ---------      ---------    -----------  -----

    Gross premiums
     written               $336,081       $317,904     $318,394  $972,379
    Net premiums
     written                243,313        205,127      318,036   766,476
    Net premiums earned     216,292        223,001      218,347   657,640
    Other income                835              -            -       835
    Net losses and loss
     expenses              (101,019)      (113,294)    (111,903) (326,216)
    Acquisition costs       (27,954)        (2,727)     (43,410)  (74,091)
    General and
     administrative
     expenses               (57,395)       (38,733)     (22,732) (118,860)
                            -------        -------      -------  --------
    Underwriting income      30,759         68,247       40,302   139,308
    Net investment
     income                                                       154,391
    Net realized
     investment gains                                              41,695
    Net impairment
     charges recognized
     in earnings                                                  (47,437)
    Amortization and
     impairment of
     intangible assets                                             (2,130)
    Interest expense                                              (19,969)
    Foreign exchange
     gain                                                             387
                                                                      ---
    Income before
     income taxes                                                $266,245
                                                                 ========

    GAAP Ratios:
    Loss and loss
     expense ratio             46.7%          50.8%        51.3%     49.6%
    Acquisition cost
     ratio                     12.9%           1.2%        19.9%     11.3%
    General and
     administrative
     expense ratio             26.5%          17.4%        10.4%     18.1%
                               ----           ----         ----      ----
    Combined ratio             86.1%          69.4%        81.6%     79.0%
                               ====           ====         ====      ====
    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED OPERATING INCOME RECONCILIATION
     (Expressed in thousands of United States dollars, except share and
      per share amounts)

                                                Quarter Ended June 30,
                                               2010               2009
                                               ----               ----

    Net income                             $183,959           $113,670
    Add after tax affect of:
      Net realized investment gains         (88,850)            (5,093)
      Net impairment charges
       recognized in earnings                     -              5,474
      Foreign exchange loss/(gain)              559             (1,222)
                                                ---             ------
    Operating income                        $95,668           $112,829
                                            =======           ========

    Weighted average common shares
     outstanding:
    Basic                                50,222,974         49,523,459
    Diluted                              52,974,410         51,257,887

    Basic per share data:
    Net income                                $3.66              $2.30
    Add after tax affect of:
      Net realized investment gains           (1.77)             (0.10)
      Net impairment charges
           recognized in earnings                 -               0.11
      Foreign exchange loss/(gain)             0.01              (0.03)
                                               ----              -----
    Operating income                          $1.90              $2.28
                                              =====              =====

    Diluted per share data
    Net income                                $3.47              $2.22
    Add after tax affect of:
      Net realized investment gains           (1.68)             (0.10)
      Net impairment charges
       recognized in earnings                     -               0.11
      Foreign exchange loss/(gain)             0.01              (0.03)
                                               ----              -----
    Operating income                          $1.80              $2.20
                                              =====              =====

                                               Six Months Ended June 30
                                                 2010            2009
                                                 ----            ----

    Net income                                 $317,699        $245,078
    Add after tax affect of:
      Net realized investment gains            (162,452)        (41,695)
      Net impairment charges
       recognized in earnings                       109          47,437
      Foreign exchange loss/(gain)                1,635            (387)
                                                  -----            ----
    Operating income                           $156,991        $250,433
                                               ========        ========

    Weighted average common shares
     outstanding:
    Basic                                    50,123,945      49,386,549
    Diluted                                  53,086,708      51,215,808

    Basic per share data:
    Net income                                    $6.34           $4.96
    Add after tax affect of:
      Net realized investment gains               (3.24)          (0.84)
      Net impairment charges
       recognized in earnings                         -            0.96
      Foreign exchange loss/(gain)                 0.03           (0.01)
                                                   ----           -----
    Operating income                              $3.13           $5.07
                                                  =====           =====

    Diluted per share data
    Net income                                    $5.98           $4.79
    Add after tax affect of:
      Net realized investment gains               (3.05)          (0.81)
      Net impairment charges
       recognized in earnings                         -            0.92
      Foreign exchange loss/(gain)                 0.03           (0.01)
                                                   ----           -----
    Operating income                              $2.96           $4.89
                                                  =====           =====
    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED  DILUTED BOOK VALUE PER SHARE RECONCILIATION
     (Expressed in thousands of United States dollars, except share and
      per share amounts)

                                           As of        As of       As of
                                          June 30   December 31,  June 30
                                             2010        2009        2009
                                             ----        ----        ----
    Price per share at period end          $45.38      $46.07      $40.83

    Total shareholders' equity          3,468,543   3,213,295   2,741,427

    Basic common shares outstanding    49,407,301  49,734,487  49,524,492

    Add: unvested restricted share
     units                                804,644     915,432     947,180

    Add:  Performance based equity
     awards                             1,409,984   1,583,237   1,329,661

    Add:  dilutive options/warrants
     outstanding                        6,667,941   6,805,157   6,569,616
      Weighted average exercise price
       per share                           $34.52      $34.44      $33.70
    Deduct: options bought back via
     treasury method                  (5,072,455) (5,087,405) (5,423,031)
                                       ----------  ----------  ----------

    Common shares and common share
    equivalents outstanding            53,217,415  53,950,908  52,947,918

    Basic book value per common share      $70.20      $64.61      $55.35
    Diluted book value per common
     share                                 $65.18      $59.56      $51.78

    ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
    UNAUDITED ANNUALIZED RETURN ON SHAREHOLDERS' EQUITY RECONCILIATION
     (Expressed in thousands of United States dollars, except for
      percentage information)

                                                  Quarter Ended June 30,
                                                   2010          2009
                                                   ----          ----

    Opening shareholders' equity               $3,338,807    $2,491,860
    Deduct: accumulated other comprehensive
     income                                      (142,284)      (48,204)
                                                 --------       -------
    Adjusted opening shareholders' equity       3,196,523     2,443,656

    Closing shareholders' equity               $3,468,543    $2,741,427
    Deduct: accumulated other comprehensive
     income                                      (138,245)      (48,669)
                                                 --------       -------
    Adjusted closing shareholders' equity       3,330,298     2,692,758

    Average shareholders' equity               $3,263,411    $2,568,207
                                               ==========    ==========

    Net  income available to shareholders        $183,959      $113,670
    Annualized net income available to
     shareholders                                 735,836       454,680

    Annualized return on average shareholders'
     equity -net income available to
     shareholders                                    22.5%         17.7%
                                                     ====          ====

    Operating income available to shareholders    $95,668      $112,829
    Annualized operating income available to
     shareholders                                 382,672       451,316

    Annualized return on average shareholders'
     equity -operating income available to
     shareholders                                    11.7%         17.6%
                                                     ====          ====

                                                 Six Months Ended June 30,
                                                   2010             2009
                                                   ----             ----

    Opening shareholders' equity               $3,213,295        $2,416,862
    Deduct: accumulated other comprehensive
     income                                      (149,849)         (105,632)
                                                 --------          --------
    Adjusted opening shareholders' equity       3,063,446         2,311,230

    Closing shareholders' equity               $3,468,543        $2,741,427
    Deduct: accumulated other comprehensive
     income                                      (138,245)          (48,669)
                                                 --------           -------
    Adjusted closing shareholders' equity       3,330,298         2,692,758

    Average shareholders' equity               $3,196,872        $2,501,994
                                               ==========        ==========

    Net  income available to shareholders        $317,699          $245,078
    Annualized net income available to
     shareholders                                 635,398           490,156

    Annualized return on average shareholders'
     equity -net income available to
     shareholders                                    19.9%             19.6%
                                                     ====              ====

    Operating income available to shareholders   $156,991          $250,433
    Annualized operating income available to
     shareholders                                 313,982           500,866

    Annualized return on average shareholders'
     equity -operating income available to
     shareholders                                     9.8%             20.0%
                                                      ===              ====

Website: www.awac.com

Media: Faye Cook, Vice President, Marketing & Communications, +1-441-278-5406, faye.cook at awac.com, or Investors: Keith J. Lennox, Investor Relations Officer, +1-646-794-0750, keith.lennox at awac.com, both of Allied World Assurance Company Holdings, Ltd

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