Our move to increase property reinsurance underwriting in Aspen Bermuda has progressed well to date. Brokers and clients are continuing to be supportive, and in the first quarter approximately 60% of our property reinsurance business was written in Bermuda. We expect this percentage to increase over time.

In prior quarters we presented the results of our business in two major segments – Insurance and Reinsurance. Starting this quarter, we are presenting our business results in four segments which better reflect the way we currently view and manage the business. The four segments are Property Reinsurance, Casualty Reinsurance, Specialty Reinsurance and Insurance and Property and Casualty Insurance.

Application of Critical Accounting Estimates

Our consolidated financial statements are based on the application of significant accounting policies and include significant accounting estimates which require management to make significant assumptions. We believe that some of the more critical judgments in the areas of accounting estimates and assumptions that affect our financial condition and results of operations are related to the recognition of premiums written and ceded and reserves for losses and loss adjustment expenses. For a detailed discussion of our critical accounting estimates please refer to our 2004 Annual Report on Form 10-K filed with the Securities and Exchange Commission. There were no material changes in the application of our critical accounting estimates subsequent to that report. We have discussed the application of these critical accounting estimates with our Board of Directors and Audit Committee.

Results of Operations

The following is a discussion and analysis of the Company's consolidated results of operations for the three months ended March 31, 2005 and 2004.

Gross Premiums Written.    For the three months ended March 31, 2005, gross premiums written were $804.1 million, a 25.6% increase over the $640.2 million written for the three months ended March 31, 2004. The increase was principally a result of the contribution from the new marine and aviation classes of business which were not written during the first quarter of 2004.

Reinsurance ceded.    Reinsurance premiums ceded for the three months ended March 31, 2005 were $171.7 million compared to $130.8 million for the three months ended March 31, 2004. The $40.9 million increase was mainly due to an additional $12 million covering risks relating to our new marine and aviation lines of business and a $26 million increase covering risks relating to our property reinsurance class.

Net premiums written.    Net premiums written for the three months ended March 31, 2005 were $632.4 million. This represents a 24.1% increase over the equivalent period in 2004 and is due to the increase in gross premiums from the new business classes.

Gross premiums earned.    Gross premiums earned for the three months ended March 31, 2005 were $433.7 million, which represented 53.9% of gross premiums written. For the three months ended March 31, 2004, gross premiums earned were $358.0 million which represented 55.9% of gross premiums written. The increase in earned premiums reflects the growth in the overall volume of business written by the Company. The reduction in the earned to written premium ratio is due to a change in the mix of property reinsurance business towards more proportional treaty business which earns at a slower rate than non-proportional business.

Net premiums earned.    Net premiums earned for the three months ended March 31, 2005 were $378.7 million, representing 59.9% of net premiums written. Net premiums earned for the three months ended March 31, 2004 were $305.8 million, representing 60% of net premiums written. The $72.9 million increase was due to the earned premiums resulting from the increased premiums written in the quarter.

Insurance losses and loss adjustment expenses.    Insurance losses and loss adjustment expenses for the three months ended March 31, 2005 were $207.4 million which was an increase of 67% compared to the three months ended March 31, 2004. Paid claims in the period were $112.2 million compared to $19.8 million in 2004. The increase in paid claims was due to the payment of 2004 storm losses in 2005. Of the total gross reserves for unpaid losses of $1,391.5 million at the balance sheet date of March 31, 2005 a total of $862.5 million or 62.0% represented IBNR claims. Three material claims

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incurred and reported during the three months ended March 31, 2005 provided a combined gross loss of $41.7 million. However, the charge for the period has been reduced by $12.5 million due to a reduction in prior year loss provisions.

Policy acquisition expenses.    Policy acquisition expenses for the three months ended March 31, 2005 were $70.2 million representing 18.5% of net premiums earned. Policy acquisition expenses for the three months ended March 31, 2004 were $59.0 million representing 19.3% of net premiums earned. The $11.2 million increase in policy acquisition expenses as compared to the three months ended March 31, 2004 was due to the greater volume of premium earned and the reduced acquisition ratio due to changes in the mix of business.

Operating and administrative expenses.    Operating and administrative expenses for the three months ended March 31, 2005 were $29.4 million, as compared to $18.1 million for the three months ended March 31, 2004, and included higher provisions for fixed and performance-related staff compensation due to larger staffing levels as we expand our operations.

Net investment income.    Net investment income of $25.5 million for the three months ended March 31, 2005 was mainly derived from our portfolio of fixed interest securities, money market funds and bank deposits. Net investment income for the three months ended March 31, 2004 was $12.0 million. The increase in net investment income was due to the significant increase in invested funds arising from both positive operating cashflows and the receipt of funds following our $250 million debt offering in August 2004.

Income before tax.    Income before tax for the three months ended March 31, 2005 was $89.9 million, including underwriting income of $71.7 million, investment returns including gains and losses of $23.3 million, interest expense on loans of $4.0 million and other expenses of $1.1 million. The $25.2 million reduction in income before tax for the three months ended March 31, 2005 is mainly due to the 14.2% increase in the loss ratio in the three months ended March 31, 2005 compared to the three months ended March 31, 2004, offset by the increase in net investment income.

Income tax expense.    Income tax expense for the three months ended March 31, 2005 was $19.8 million. Our consolidated tax rate for the three months ended March 31, 2005 was 22.0%, (2004 - - 26.2%). The reduction in the tax rate reported for the three months ended March 31, 2005 was due to a greater proportion of the Company's estimated profit emanating from our Bermudian operations.

Net income.    Net income for the three months ended March 31, 2005 was $70.1 million, equivalent to $1.01 earnings per basic share and $0.98 fully diluted earnings per share on the basis of the weighted average number of shares in issue during the three months ended March 31, 2005. Net income for the three months ended March 31, 2004 was $85.0 million.

Underwriting Results by Operating Segments

Our business segments are based on how we monitor the performance of our underwriting operations. In 2005, management revised the presentation of our underwriting results into four segments to more accurately reflect the organizational structure of the business. Our four segments are property reinsurance, casualty reinsurance, specialty insurance and reinsurance and property and casualty insurance. Management measures segmental results on the basis of the combined ratio, which is obtained by dividing the sum of the losses and loss expenses, acquisition expenses and general and administrative expenses by net premiums earned. Our historical combined ratio may not be indicative of future underwriting performance. We do not manage our assets by segment; accordingly, investment income and total assets are not allocated to the individual segments. General and administrative expenses are allocated to segments based on each segment's proportional share of gross premiums written.

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The following table summarizes gross and net written premium, underwriting results, and combined ratios and reserves for each of our business segments for the three months ended March 31, 2005 and March 31, 2004, with the 2004 results being represented to reflect our new reportable segments:

				Three Months Ended March 31, 2005
				Property Reinsurance				Casualty Reinsurance				Specialty Insurance & Reinsurance				Property & Casualty Insurance				Total
				($ in millions, except percentages)
Gross premiums written				$	305.0			$	272.4			$	149.4			$	77.3			$	804.1
Net premiums written					185.0				260.0				136.6				50.8				632.4
Gross premiums earned					180.9				111.2				47.7				93.9				433.7
Net premiums earned					146.7				106.3				46.0				79.7				378.7
Expenses:
Losses and loss expenses					(61.3	)			(76.4	)			(21.2	)			(48.5	)			(207.4	)
Policy acquisition, operating and administrative expenses					(46.9	)			(22.0	)			(10.6	)			(20.1	)			(99.6	)
Underwriting profit					38.5				7.9				14.2				11.1				71.7
Net reserves for loss and loss adjustment expenses				$	243.7			$	423.9			$	161.2			$	334.9			$	1,163.7
Ratios
Loss ratio					41.8	%			71.9	%			46.1	%			60.9	%			54.8	%
Expense ratio					32.0	%			20.7	%			23.0	%			25.2	%			26.3	%
Combined ratio					73.8	%			92.6	%			69.1	%			86.1	%			81.1	%

				Three Months Ended March 31, 2004
				Property Reinsurance				Casualty Reinsurance				Specialty Insurance & Reinsurance				Property & Casualty Insurance				Total
				($ in millions, except percentages)
Gross premiums written				$	284.1			$	235.5			$	39.3			$	81.3			$	640.2
Net premiums written					190.2				227.0				37.7				54.5				509.4
Gross premiums earned					157.0				75.4				34.6				91.0				358.0
Net premiums earned					122.6				74.2				32.6				76.4				305.8
Expenses:
Losses and loss expenses					(17.2	)			(49.9	)			(14.5	)			(42.5	)			(124.1	)
Policy acquisition, operating and administrative expenses					(36.5	)			(16.1	)			(5.2	)			(19.3	)			(77.1	)
Underwriting profit					68.9				8.2				12.9				14.6				104.6
Net reserves for loss and loss adjustment expenses				$	105.1			$	180.5			$	107.2			$	199.9			$	592.7
Ratios
Loss ratio					14.0	%			67.3	%			44.5	%			55.6	%			40.6	%
Expense ratio					29.8	%			21.7	%			15.9	%			25.3	%			25.2	%
Combined ratio					43.8	%			89.0	%			60.4	%			80.9	%			65.8	%

The loss ratio is calculated by dividing losses and loss expenses by net premiums earned. The expense ratio is calculated by dividing policy acquisition, operating and administrative expenses by net premiums earned. The combined ratio is the sum of the loss ratio and expense ratio.

For the Three Months Ended March 31, 2005 and the Three Months Ended March 31, 2004

Property Reinsurance

Our property reinsurance line of business is generally written on a treaty basis and includes catastrophe, risk excess and pro rata, including retrocession. A small proportion of facultative business is written by Aspen Re America.

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Premiums.    Gross premiums written for our property reinsurance line of business increased by 7.4% compared to the three months ended March 31, 2004. This increase was principally due to increased business written by Aspen Bermuda as a result of the recent transfer of our London-based property reinsurance team to Aspen Bermuda and $13.4 million of premium written by Aspen Re America in the three months ended March 31, 2005 which did not write any business in the first quarter of 2004 as it was not fully operational in such period.

Losses and loss adjustment expenses.    Losses and loss adjustment expenses were $61.3 million for the three months ended March 31, 2005, representing 41.8% of net earned premiums for the three months ended March 31, 2005. The significant increase over the 14.0% reported for the three months ended March 31, 2004 was due to the unusually low incidence of losses in the first quarter of 2004 compared to the more normal level of losses experienced in 2005.

Policy acquisition, operating and administration expenses.    Total expenses were $46.9 million for the three months ended March 31, 2005, equivalent to 32.0% of net earned premiums. The increase of $10.4 million in expenses over the three months ended March 31, 2004 reflected the higher acquisition costs of the pro rata treaty business.

Casualty Reinsurance

Our casualty reinsurance line of business is written mainly on a treaty basis with a small proportion of facultative risks. The casualty treaty reinsurance is primarily written on an excess of loss basis and includes coverage for claims arising from automobile accidents, employers' liability, professional indemnity and other third party liabilities. It is written in respect of cedents located mainly in the United States, the United Kingdom, Europe and Australia.

Premiums.    Gross premiums written for our casualty reinsurance line of business increased by 15.7% compared to the three months ended March 31, 2004. This increase in our casualty reinsurance segment was primarily due to growth in our US casualty business.

Losses and loss adjustment expenses.    Losses and loss adjustment expenses were $76.4 million for the three months ended March 31, 2005, representing an increase of 53.1% over the three months ended March 31, 2004. The $26.5 million increase is due to the increase in earned premium in 2005 and an increase in the proportion of US casualty business written, which is reserved at a higher loss ratio.

Policy acquisition, operating and administration expenses.    Total expenses were $22.0 million for the three months ended March 31, 2005, equivalent to 20.7% of net earned premiums, a reduction of one percentage point over the three months ended March 31, 2004. The reduction in expense ratio reflects a slight reduction in average commission rates.

Specialty Insurance and Reinsurance

Specialty Insurance includes marine and aviation insurance written by Aspen Re. Specialty Reinsurance lines of business includes aviation, contingency and marine reinsurance.

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The following table summarizes gross and net written premiums and underwriting results for each of the lines of business within our specialty insurance and reinsurance segment for the three months ended March 31, 2005 and 2004:

				Three Months Ended March 31, 2005
				Specialty Insurance				Specialty Reinsurance				Total
				($ in millions, except percentages)
Gross premiums written				$	109.8			$	39.6			$	149.4
Net premiums written					97.8				38.8				136.6
Gross premiums earned					22.8				24.9				47.7
Net premiums earned					18.9				27.1				46.0
Losses and loss adjustment expenses					(12.9	)			(8.3	)			(21.2	)
Policy acquisition, operating and administration expenses					(5.3	)			(5.3	)			(10.6	)
Underwriting profit				$	0.7			$	13.5			$	14.2
Ratios
Loss ratio					68.3	%			30.6	%			46.1	%
Expense ratio					28.0	%			19.6	%			23.0	%
Combined ratio					96.3	%			50.2	%			69.1	%

				Three Months Ended March 31, 2004
				Specialty Insurance				Specialty Reinsurance				Total
				($ in millions, except percentages)
Gross premiums written				$	—			$	39.3			$	39.3
Net premiums written					—				37.7				37.7
Gross premiums earned					—				34.6				34.6
Net premiums earned					—				32.6				32.6
Losses and loss adjustment expenses					—				(14.5	)			(14.5	)
Policy acquisition, operating and administration expenses					—				(5.2	)			(5.2	)
Underwriting profit				$	—			$	12.9			$	12.9
Ratios
Loss ratio					—				44.5	%			44.5	%
Expense ratio					—				15.9	%			15.9	%
Combined ratio					—				60.4	%			60.4	%

Premiums.    Gross premiums written increased by 280.2% compared to the three months ended March 31, 2004, as a result of the business written by the new marine and aviation insurance underwriting teams.

Losses and loss adjustment expenses.    Losses and loss adjustment expenses were $21.2 million for the three months ended March 31, 2005, representing 46.1% of net earned premiums for the three months ended March 31, 2005. The $6.7 million increase compared to the three months ended March 31, 2004 was due to the impact of the new specialty insurance business line less the $5.3 million specialty reinsurance prior year release.

Policy acquisition, operating and administration expenses.    Total expenses were $10.6 million for the three months ended March 31, 2005. The $5.4 million increase in expenses from the three months ended March 31, 2004 reflected the expenses incurred from the new marine and aviation insurance team.

Property and Casualty Insurance

We write both commercial property and commercial liability insurance. Our commercial property line of business is composed of U.K. commercial property insurance, world-wide commercial property and U.S. excess and surplus lines property business written through Aspen Specialty.

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The commercial liability line of business consists of U.K. employers' and public liability insurance and U.S. casualty insurance written on a surplus lines basis by Aspen Specialty.

The following table summarizes gross and net written premiums and underwriting results for each of the lines of business within our property and casualty insurance segment for the three months ended March 31, 2005 and 2004:

				Three Months Ended March 31, 2005
				Property Insurance				Casualty Insurance				Total
				($ in millions, except percentages)
Gross premiums written				$	24.0			$	53.3			$	77.3
Net premiums written					6.3				44.5				50.8
Gross premiums earned					27.8				66.1				93.9
Net premiums earned					21.2				58.5				79.7
Losses and loss adjustment expenses					(8.1	)			(40.4	)			(48.5	)
Policy acquisition, operating and administration expenses					(6.4	)			(13.7	)			(20.1	)
Underwriting profit				$	6.7			$	4.4			$	11.1
Ratios
Loss ratio					38.2	%			69.1	%			60.9	%
Expense ratio					30.2	%			23.4	%			25.2	%
Combined ratio					68.4	%			92.5	%			86.1	%

				Three Months Ended March 31, 2004
				Property Insurance				Casualty Insurance				Total
				($ in millions, except percentages)
Gross premiums written				$	23.9			$	57.4			$	81.3
Net premiums written					6.0				48.5				54.5
Gross premiums earned					21.1				69.9				91.0
Net premiums earned					14.3				62.1				76.4
Losses and loss adjustment expenses					(9.2	)			(33.3	)			(42.5	)
Policy acquisition, operating and administration expenses					(4.1	)			(15.2	)			(19.3	)
Underwriting profit				$	1.0			$	13.6			$	14.6
Ratios
Loss ratio					64.3	%			53.6	%			55.6	%
Expense ratio					28.7	%			24.5	%			25.3	%
Combined ratio					93.0	%			78.1	%			80.9	%

Gross Premiums Written.    Gross premiums written in the insurance segment for the three months ended March 31, 2005 were $77.3 million, a 4.9% decrease from the three months ended March 31, 2004. The reduction is attributable to reductions in our U.K. business partly offset by increases in our U.S. business. The reductions in the U.K. are in respect of both property and liability and result from increasing competition. Our U.S. business increased in this period compared to the first quarter of 2004 as Aspen Specialty was still in the early stages of development in the beginning of 2004.

Losses and loss adjustment expenses.    Total loss and loss adjustment expenses were $48.5 million. The increase of $6 million in loss and loss adjustment expenses was due to the increase in the loss ratio for the 2005 casualty business offset by a reduction in the property loss ratio as a result of a $5.9 million prior period release.

Policy acquisition, operating and administration expenses.    Total expenses were $20.1 million for the three months ended March 31, 2005, equivalent to 25.2% of net earned premiums.

Reserves for Losses and Loss Expenses

As of March 31, 2005, the Company had accrued losses and loss adjustment expense reserves of $1,391.5 million. This amount represented the Company's best estimate of the ultimate liability for

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payment of losses and loss adjustment expenses. Of the total gross reserves for unpaid losses, $862.5 million or 62.0% represented IBNR claims. During the three months ended March 31, 2005 the Company paid losses and loss adjustment expenses of $112.2 million.

				As at March 31, 2005
				Gross				Reinsurance Recoverable				Net
				($ in millions)
Property Reinsurance				$	384.4			$	(140.7	)		$	243.7
Casualty Reinsurance					429.8				(5.9	)			423.9
Specialty Insurance and Reinsurance					191.6				(30.4	)			161.2
Property & Casualty Insurance					385.7				(50.8	)			334.9
Total Losses and loss expense reserve				$	1,391.5			$	(227.8	)		$	1,163.7

For the three months ended March 31, 2005, there was a reduction of our estimate of the ultimate claims to be paid in respect of the 2004 and prior accident years. An analysis of this reduction by line of business is as follows:

				As at March 31, 2005
				($ in millions)
Property Reinsurance				$	0.7
Casualty Reinsurance					0.4
Specialty Insurance and Reinsurance					5.2
Property and Casualty Insurance					6.2
Total Losses and loss expense reserve				$	12.5

The key elements which gave rise to the favorable development during the three months ended March 31, 2005 were as follows:

Specialty insurance and reinsurance:    The $5.2 million reduction in the net reserves in our specialty insurance and reinsurance segment is due to a general improvement across several specialty reinsurance classes of business including aviation, marine and various quota shares which contributed to the release.

Property and casualty insurance:    The majority of the release was from the U.K. property class and was due to much better than expected experience on non-catastrophe incurred loss ratios for the 2004 accident year.

For a more detailed description see "Management's Discussion and Analysis Critical Accounting Policies Reserves for Losses and Loss Expenses," included in our 2004 Annual Report on Form 10-K filed with the Securities and Exchange Commission.

Liquidity and Capital Resources

Aspen is a holding company that does not have any significant operations or assets other than its ownership of the shares of its direct and indirect subsidiaries, including Aspen Re, Aspen Bermuda and Aspen Specialty. Aspen relies primarily on dividends and other permitted distributions from these insurance subsidiaries to pay its operating expenses, interest on debt finance and dividends, if any, on its ordinary shares. There are restrictions on the payment of dividends by Aspen Re, Aspen Bermuda and Aspen Specialty to Aspen, which are described in more detail in the "Business – Regulatory Matters" section of the 2004 Annual Report on Form 10-K filed with the Securities and Exchange Commission.

Our aggregate invested assets as of March 31, 2005 were $2.8 billion compared to aggregate invested assets of $2.7 billion as of December 31, 2004. The increase in invested assets since December 31, 2004 resulted from collections of premiums on insurance policies and reinsurance contracts and investment income, offset by policy acquisition expenses paid, reinsurance premiums paid, operating and administrative expenses paid.

Total net cash flow from operations from December 31, 2004 through March 31, 2005 was $210.6 million, an increase from $208.6 million from the prior year period. For the three months ended March 31, 2005, our cash flows from operations provided us with sufficient liquidity to meet our

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operating requirements. On March 25, 2005, we paid a dividend of $0.15 per ordinary share to shareholders of record on March 15, 2005.

Our contractual obligations other than our obligations to employees consist mainly of amounts outstanding under our senior notes, reserves relating to our insurance and reinsurance contracts, and operating leases. Note 6 to the unaudited condensed consolidated financial statements summarizes amounts outstanding under our contractual obligations as of March 31, 2005.

Effects of inflation

The effects of inflation could cause the severity of claims from catastrophes or other events to rise in the future. Our calculation of reserves for losses and loss expenses includes assumptions about future payments for settlement of claims and claims-handling expenses, such as medical treatments and litigation costs. We write liability business in the United States, the United Kingdom and Australia, where claims inflation has grown particularly strong in recent years. To the extent inflation causes these costs to increase above reserves established for these claims, we will be required to increase our loss reserves with a corresponding reduction in retained earnings.

Cautionary statement regarding forward-looking statements

This Form 10-Q contains, and the Company may from time o time make other verbal or written, forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act") and Section 21E of the Securities Exchange Act of 1934 (the "Exchange Act") that involve risks and uncertainties, including statements regarding our capital needs, business strategy, expectations and intentions. Statements that use the terms "believe", "do not believe", "anticipate", "expect", "plan", "estimate", "intend" and similar expressions are intended to identify forward-looking statements. These statements reflect our current views with respect to future events and because our business is subject to numerous risks, uncertainties and other factors, our actual results could differ materially from those anticipated in the forward-looking statements. The risks, uncertainties and other factors set forth in the Company's 2004 Annual Report on Form 10-K filed with the Securities and Exchange Commission and other cautionary statements made in this report, as well as the following factors, should be read and understood as being applicable to all related forward-looking statements wherever they appear in this report.

All forward-looking statements address matters that involve risks and uncertainties. Accordingly, there are or will be important factors that could cause actual results to differ materially from those indicated in these statements. We believe that these factors include, but are not limited to, the following:

•	our relatively short operating history;

•	the impact of acts of terrorism and acts of war;

•	greater frequency or severity of claims and loss activity, including as a result of natural or man-made catastrophic events, than our underwriting, reserving or investment practices have anticipated;

•	the effectiveness of our loss limitation methods;

•	changes in the availability, cost or quality of reinsurance or retrocessional coverage;

•	loss of key personnel;

•	the inability to maintain financial strength or claims-paying ratings by one or more of our subsidiaries;

•	changes in general economic conditions, including inflation, foreign currency exchange rates, interest rates and other factors that could affect our investment portfolio;

•	increased competition on the basis of pricing, capacity, coverage terms or other factors;

•	the effects of terrorist-related insurance legislation and laws;

•	decreased demand for our insurance or reinsurance products and cyclical downturn of the industry;

•	changes in regulations or tax laws applicable to us, our subsidiaries, brokers or customers;

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•	Aspen Holdings or Aspen Bermuda becomes subject to income taxes in the United States or the United Kingdom; and

•	the effect on insurance markets, business practices and relationships of current litigation, investigations and regulatory activity by the New York State Attorney General's office and other authorities concerning contingent commission arrangements with brokers and bid solicitation activities.

The loss reserves and other estimates regarding the windstorms affecting the southeastern United States and Japan in late 2004, as well as the impact of industry losses on pricing and terms and conditions, could be affected by the following:

•	the total industry losses resulting from these storms;

•	the actual number of the Company's insureds incurring losses from these storms;

•	the limited actual loss reports received from the Company's insureds to date;

•	the Company's reliance on industry loss estimates and those generated by modeling techniques;

•	the amount and timing of losses actually incurred and reported by insureds to the Company;

•	the continued uncertainty in the range of loss estimates to date from the insurance industry;

•	the impact of these storms in the marine and energy market;

•	the inherent uncertainties of establishing estimates and reserves for losses and loss adjustment expenses;

•	the amount and timing of reinsurance recoverables and reimbursements actually received by the Company from its reinsurers; and

•	the overall level of competition, and the related demand and supply dynamics, in the wind exposed property reinsurance lines as contracts come up for renewal.

The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this report. We undertake no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise or disclose any difference between our actual results and those reflected in such statements.

If one or more of these or other risks or uncertainties materialize, or if our underlying assumptions prove to be incorrect, actual results may vary materially from what we projected. Any forward-looking statements you read in this report reflect our current views with respect to future events and are subject to these and other risks, uncertainties and assumptions relating to our operations, results of operations, growth strategy and liquidity. All subsequent written and oral forward-looking statements attributable to us or individuals acting on our behalf are expressly qualified in their entirety by the points made above. You should specifically consider the factors identified in this report which could cause actual results to differ before making an investment decision.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

We believe that we are principally exposed to three types of market risk: interest rate risk, foreign currency risk and credit risk.

Interest rate risk.    Our investment portfolio consists of fixed income securities. Accordingly, our primary market risk exposure is to changes in interest rates. Fluctuations in interest rates have a direct impact on the market valuation of these securities. As interest rates rise, the market value of our fixed-income portfolio falls, and the converse is also true. We expect to manage interest rate risk by selecting investments with characteristics such as duration, yield, currency and liquidity taking into account the anticipated cash outflow characteristics of Aspen Re's, Aspen Bermuda's and Aspen Specialty's insurance and reinsurance liabilities.

Our strategy for managing interest rate risk also includes maintaining a high quality portfolio with a relatively short duration to reduce the effect of interest rate changes on book value. A significant portion of the investment portfolio matures each year, allowing for reinvestment at current market rates. The portfolio is actively managed and trades are made to balance our exposure to interest rates.

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As at March 31, 2005, our portfolio had an approximate duration of 1.86 years. The table below depicts interest rate change scenarios and the effect on our interest-rate sensitive invested assets:

Effect of changes in interest rates on portfolio given a parallel shift in the yield curve

Movement in rates in basis points				-100				-50				0				50				100
				($ in thousands, except percentages)
Market Value				$	2,879,631			$	2,849,568			$	2,819,400			$	2,789,232			$	2,759,109
Gain/Loss					60,231				30,168				0				(30,168	)			(60,291	)
Percentage of Portfolio					2.14	%			1.07	%			0				1.07	%			2.14	%

Foreign currency risk.    Our reporting currency is the U.S. Dollar. The functional currencies of our reinsurance and insurance segments are U.S. Dollars and British Pounds. As of March 31, 2005, approximately 71% of our investments are held in U.S. Dollars, approximately 21% are in British Pounds and approximately 8% are in currencies other than the U.S. Dollar and the British Pound. For the three months ended March 31, 2005, 13% of our gross premiums were written in currencies other than the U.S. Dollar and the British Pound and we expect that a similar proportion will be written in currencies other than the U.S. Dollar and the British Pound in 2005. Other foreign currency amounts are remeasured to the appropriate functional currency and the resulting foreign exchange gains or losses are reflected in the statement of operations. Functional currency amounts of assets and liabilities are then translated into U.S. Dollars. The unrealized gain or loss from this translation, net of tax, is recorded as part of ordinary shareholders' equity. The change in unrealized foreign currency translation gain or loss during the year, net of tax, is a component of comprehensive income. Both the remeasurement and translation are calculated using current exchange rates for the balance sheets and average exchange rates for the statement of operations. We may experience exchange losses to the extent our foreign currency exposure is not properly managed or otherwise hedged, which in turn would adversely affect our results of operations and financial condition. Management estimates that a 10% change in the exchange rate between British Pounds and U.S. Dollars as at March 31, 2005, would have impacted reported net comprehensive income by approximately $21.7 million for the three months ended March 31, 2005.

We will attempt to manage our foreign currency risk by seeking to match our liabilities under insurance and reinsurance policies that are payable in foreign currencies with investments that are denominated in these currencies. Although in the past we had entered into forward foreign currency exchange contracts, we had no outstanding forward contracts as at March 31, 2005.

Credit risk.    We have exposure to credit risk primarily as a holder of fixed income securities. Our risk management strategy and investment policy is to invest in debt instruments of high credit quality issuers and to limit the amount of credit exposure with respect to particular ratings categories and any one issuer. No more than 5% of the fixed-income securities in our investment portfolio may be rated below "A−". As at March 31, 2005, the average rate of fixed income securities in our investment portfolio was "AA+". In addition, we are exposed to the credit risk of our insurance and reinsurance brokers to whom we make claims payments for insureds and our reinsureds, as well as to the credit risk of our reinsurers and retrocessionaires who assume business from us. Other than fully collateralized reinsurance the substantial majority of our reinsurers have a rating of "A" (Excellent), the third highest of fifteen rating levels, or better by A.M. Best and the minimum rating of any of our material reinsurers is "A−" (Excellent), the fourth highest of fifteen rating levels, by A.M. Best.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

The Company, under the supervision and with the participation of the Company's management, including the Company's Chief Executive Officer and Chief Financial Officer, has evaluated the design and operation of the Company's disclosure controls and procedures as of the end of the period of this report. Our management does not expect that our disclosure controls or our internal controls will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. As a result of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all

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control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons or by collusion of two or more people. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. As a result of the inherent limitations in a cost-effective control system, misstatement due to error or fraud may occur and not be detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the disclosure controls and procedures are met. Based on the evaluation of the disclosure controls and procedures, the Chief Executive Officer and Chief Financial Officer have concluded that the Company's disclosure controls and procedures were effective in ensuring that information required to be disclosed by the Company in this report is recorded, processed, summarized and reported in a timely fashion.

Changes in internal control over financial reporting

The Company's management has performed an evaluation, with the participation of the Company's Chief Executive Officer and the Company's Chief Financial Officer, of changes in the Company's internal control over financial reporting that occurred during the quarter ended March 31, 2005. Based upon that evaluation, the Company's management is not aware of any change in its internal control over financial reporting that occurred during quarter ended March 31, 2005 that has materially affected, or is reasonably likely to materially affect, the Company's internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1.     Legal Proceedings

Similar to the rest of the insurance and reinsurance industry, we are subject to litigation and arbitration in the ordinary course of business. We are not currently involved in any material pending litigation or arbitration proceedings.

Item 2.     Changes in Securities, Use of Proceeds and Issuer Purchase of Equity Securities

None.

Item 3.    Defaults Upon Senior Securities

None.

Item 4.     Submissions of Matters to a Vote of Security Holders

No matters were submitted to a vote of the Company's shareholders during the first quarter of 2005.

Item 5.     Other Information

None.

Item 6.     Exhibits and Reports on Form 8-K

The following sets forth those exhibits filed pursuant to Item 601 of Regulation S-K:

Exhibit Number				Description
	3.1			Certificate of Incorporation and Memorandum of Association (1)
	3.2			Amended and Restated Bye-laws (1)
	4.1			Specimen Ordinary Share Certificate (1)
	4.2			Amended and Restated Instrument Constituting Options to Subscribe for Shares in Aspen Insurance Holdings Limited (1)
	4.3			Indenture between Aspen Insurance Holdings Limited and Deutsche Bank Trust Company Americas, as trustee dated as of August 16, 2004 (3)
	4.4			First Supplemental Indenture by and between Aspen Insurance Holdings Limited, as issuer and Deutsche Bank Trust Company Americas, as trustee dated as of August 16, 2004 (3)
	4.5			Exchange and Registration Rights Agreement among the Company, Deutsche Bank Securities Inc. and Goldman Sachs & Co. as representatives of the purchasers named in Schedule I thereto, dated August 16, 2004 (3)
	10.1			Amended and Restated Shareholders' Agreement, dated as of September 30, 2003 among the Company and each of the persons listed on Schedule A thereto (1)
	10.2			Third Amended and Restated Registration Rights Agreement dated as of November 14, 2003 among the Company and each of the persons listed on Schedule 1 thereto (1)
	10.3			Service Agreement dated September 24, 2004 among Christopher O'Kane, Aspen Insurance U.K. Services Limited and the Company (2) *
	10.4			Service Agreement dated September 24, 2004 between Julian Cusack and the Company (2) *
	10.5			Service Agreement dated September 24, 2004 among Sarah Davies, Aspen Insurance U.K. Services Limited and the Company (2) *
	10.6			Service Agreement dated March 10, 2005 between David May and Aspen Insurance UK Services Limited (4) *

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Exhibit Number				Description
	10.7			Aspen Insurance Holdings Limited 2003 Share Incentive Plan (1) *
	10.8			Three-Year Credit Agreement dated as of August 26, 2003 among the Company, Barclays Bank plc and the Lenders named therein (incorporated herein by reference to Exhibit 10.8 to the Company's 2003 Registration Statement on Form F-1 (Registration No. 333-110435)), as amended by the First Amendment dated January 22, 2004, the Second Amendment dated May 17, 2004, the Third Amendment dated August 2, 2004 (incorporated herein by reference to Exhibits 10.8a, 10.8b and 10.8c to the Company's Quarterly Report on Form 10-Q for the quarter ended December 31, 2004) and the Fourth Amendment dated August 9, 2004 (incorporated herein by reference to Exhibit 10.8 to the Company's 2004 Registration Statement on Form F-1 (Registration No. 333-119-314))
	10.9			364-Day Credit Agreement dated as of August 26, 2003 among the Company, Barclays Bank plc and the Lenders named therein (incorporated herein by reference to Exhibit 10.9 to the Company's Registration Statement on Form F-1 (Registration No. 333-110435)), as amended by First Amendment dated January 22, 2004, the Second Amendment dated May 17, 2004, the Third Amendment dated August 2, 2004 (incorporated herein by reference to Exhibits 10.9a, 10.9b and 10.9c to the Company's Quarterly Report on Form 10-Q for the quarter ended December 31, 2004), the Fourth Amendment dated August 9, 2004 and the Fifth Amendment dated August 25, 2004 (incorporated herein by reference to Exhibits 10.9A and 10.9B to the Company's 2004 Registration Statement on Form F-1 (Registration No. 333-119-314))
	10.10			Quota Share Agreement between Syndicate 3030 and Aspen Insurance UK Limited, dated October 21, 2003 reflecting the slip agreement entered into on June 12, 2002 therein (1)
	10.11			Slip agreement for quota share entered into June 6, 2002 between National Indemnity Company and Aspen Insurance UK Limited (1)
	10.12			Qualifying Quota Share Agreement between Wellington Underwriting, Syndicate 2020 and Aspen Insurance UK Limited dated April 15, 2003 (1)
	10.13			Slip Agreement for Property Risk Excess of Loss Reinsurance Quota Share Treaty between Aspen Insurance UK Limited and Montpelier Reinsurance Ltd., dated June 20, 2002 (1)
	10.14			Slip Agreement for Quota Share Treaty of Wellington Underwriting Inc. Property Business between Aspen Insurance UK Limited and Montpelier Reinsurance Ltd., dated June 20, 2002 (1)
	10.15			Slip Agreement for Quota Share Treaty of Wellington Underwriting Inc. Auto Liability Business between Aspen Insurance UK Limited and Montpelier Reinsurance Ltd., dated June 20, 2002 (1)
	10.16			Employment Agreement dated June 21, 2003 between Peter Coghlan and Aspen Insurance U.S. Services Inc.(incorporated herein by reference to Exhibit 10.16 to the Company's Annual Report on Form 10-K for the year ended December 31, 2003) *
	10.17			Supplemental Executive Retirement Plan prepared for Aspen Insurance U.S. Services, Inc., dated August 25, 2004 (incorporated herein by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on August 31, 2004) *
	10.18			Separation Agreement dated December 13, 2004 between Peter Coghlan and Aspen U.S. Services, Inc. (incorporated herein by reference to Exhibit 99.1 to the Company's current report on Form 8-K filed on December 16, 2004) *
	10.19			Form of Shareholder's Agreement between the Company and certain employee and/or director shareholders and/or optionholders (incorporated herein by reference to Exhibit 4.11 to the Company's 2005 Registration Statement on Form F-3 (Registration No. 333-122571) *
	10.20			Service Agreement dated March 10, 2005 between James Few and Aspen Insurance Limited (4) *
	10.21			Form of Option Agreement relating to initial option grants under the 2003 Share Incentive Plan (4) *
	10.22			Form of Option Agreement relating to options granted in 2004 under the 2003 Share Incentive Plan (4) *
	10.23			Form of Performance Share Award Agreement relating to grants in 2004 under the 2003 Share Incentive Plan (4) *

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Exhibit Number				Description
	10.24			Form of Option Agreement relating to options granted in 2005 under the 2003 Share Incentive Plan (4) *
	10.25			Form of Performance Share Award Agreement relating to grants in 2005 under the Share Incentive Plan (4) *
	31.1			Officer Certification of Christopher O'Kane, Chief Executive Officer of Aspen Insurance Holdings Limited, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed with this report.
	31.2			Officer Certification of Julian Cusack, Chief Financial Officer of Aspen Insurance Holdings Limited, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed with this report.
	32.1			Officer Certification of Christopher O'Kane, Chief Executive Officer of Aspen Insurance Holdings Limited, and Julian Cusack, Chief Financial Officer of Aspen Insurance Holdings Limited, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, submitted with this report.

*	This exhibit is a management contract or compensatory plan or arrangement.

(1)	Incorporated herein by reference to similarly numbered exhibit to the Company's 2003 Registration Statement on Form F-1 (Registration No. 333-110435).

(2)	Incorporated herein by reference to Exhibits 10.1, 10.2 and 10.3 to the Company's Current Report on Form 8-K filed on September 24, 2004.

(3)	Incorporated herein by reference to similarly numbered exhibit to the Company's 2004 Registration Statement on Form F-1 (Registration No. 333-119-314).

(4)	Incorporated herein by reference to similarly numbered exhibit to the Company's Annual Report on Form 10-K for fiscal year ended December 31, 2004, filed on March 14, 2005.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: May 9, 2005				By:  /s/ Christopher O'Kane   Christopher O'Kane   Chief Executive Officer
Date: May 9, 2005				By:  /s/ Julian Cusack   Julian Cusack   Chief Financial Officer

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