Assured Guaranty Ltd. Announces Unrealized Mark-to-Market Loss on Derivatives and Record Quarterly New Business Production for the Third Quarter of 2007

Assured Guaranty Ltd. (NYSE:AGO) ("Assured” or the "Company”) announced today that its third quarter 2007 results include an after-tax unrealized mark-to-market loss on derivatives of $163 million ($221 million before tax), or $2.40 per diluted share, on financial guaranties written in credit default swap ("CDS”) contract form. Approximately 70% of Assured’s unrealized mark-to-market loss on derivatives is due to a decline in the market value of high yield and investment grade corporate collateralized loan obligation transactions, with the balance generated by lower market values principally in the residential and commercial mortgage-backed securities markets. The mark-to-market loss does not reflect actual claims or credit losses, nor does it reduce Assured’s claims-paying resources, rating agency capital requirements or regulatory capital position. The Company’s CDS exposures are substantially similar to its financial guaranty insurance contracts and provide for credit protection against payment default. They are contracts that are held to maturity and are not subject to margin or collateral calls due to changes in market value. The net gain or loss on CDS exposure will amortize to zero as the exposure approaches its maturity date, unless there is a payment default on the exposure. As of September 30, 2007, Assured had CDS net par outstanding of $62.3 billion, $61.0 billion of which was underwritten by the financial guaranty direct segment. Details of Assured’s financial guaranty direct exposure as of September 30, 2007 by rating, and by sector and average rating are available in Table 1 of this press release. "The widening of credit spreads, which has caused the decline in the value of our in-force derivatives book, has also created significant demand and favorable pricing for new business,” stated Dominic Frederico, President and Chief Executive Officer. Accordingly, Assured also announced today that third quarter 2007 new business production as measured by the Present Value of Gross Written Premiums ("PVP”), a non-GAAP financial measure, was $133 million in the financial guaranty direct segment, a 46% increase compared to the third quarter 2006. This is the highest financial guaranty direct quarterly PVP in the Company’s history. The financial guaranty reinsurance segment’s PVP was $33 million, a 10% decline compared to the third quarter of 2006. The Company also achieved a quarterly record for consolidated PVP, which was $166 million, an increase of 30% from the prior year period. Assured has provided this preliminary information on third quarter 2007 results prior to the Company’s scheduled third quarter 2007 earnings release due to investors’ inquiries on the impact of credit market conditions on the Company. Assured’s preannouncement is strictly limited to the information contained in this press release and the Company will not provide any other details on these items or third quarter 2007 financial results until the Company’s scheduled earnings release. Third Quarter 2007 Earnings Release and Conference Call Details: Assured will release its third quarter 2007 earnings press release and financial supplement after 5:00 p.m. Eastern Time (6:00 p.m. Atlantic Time) on Thursday, November 8, 2007. A copy of these documents will be available in the Investor Information section of the Company's website located at www.assuredguaranty.com. The Company will host a conference call for investors at 8:00 a.m. ET (9:00 a.m. AT) on Friday, November 9, 2007. The earnings conference call will be available via live and archived webcast in the Investor Information section of the Company’s website at www.assuredguaranty.com or by dialing 800-638-4930 (in the U.S.) or 617-614-3944 (International), passcode 44297800. A replay of the call will be available through December 9, 2007. To listen to the replay dial: 888-286-8010 (in the U.S.) or 617-801-6888 (International), passcode 12378747. Assured Guaranty Ltd. is a Bermuda-based holding company. Its operating subsidiaries provide credit enhancement products to the U.S. and international public finance, structured finance and mortgage markets. More information can be found at www.assuredguaranty.com. Table 1 Assured Guaranty Ltd. Credit Default Swap ("CDS") Exposure Profile1 (dollars in millions)   Financial Guaranty Direct Distribution of CDS Exposure by Rating           September 30, 2007       December 31, 2006 Net Par     Net Par     Ratings2: Outstanding     % Outstanding     % AAA/Aaa $ 59,158 97.0% $ 45,901 94.4% AA/Aa 1,334 2.2% 1,863 3.8% A/A 102 0.2% 432 0.9% BBB/Baa 391 0.6% 394 0.8% Below investment grade 29     - 51     0.1% Total exposures $ 61,015     100.0% $ 48,641     100.0%     Financial Guaranty Direct Distribution of CDS Exposure by Sector and Average Rating       September 30, 2007 December 31, 2006 Sector: Net Par Out- standing     Average Rating2 Net Par Out- standing     Average Rating2 U.S. public finance General obligation $ 432 AAA $ 454 AAA Tax backed 70 AAA 112 AAA Investor-owned utilities 39 AAA 39 AAA Municipal utilities 26 AAA 26 AAA Healthcare - -- - -- Higher education - -- - -- Housing - -- - -- Other public finance - -- - -- Structured municipal - -- - -- Transportation -     -- -     -- Total U.S. public finance $ 567     AAA $ 630     AAA   U.S. structured finance Pooled corporate obligations $ 27,884 AAA $ 21,099 AAA Subprime mortgage-backed and home equity 5,861 AAA 5,023 AAA Commercial receivables 5,703 AAA 5,999 AA Prime mortgage-backed and home equity 2,777 AAA 589 AAA Other structured finance 1,087 AAA 2,315 AAA Consumer receivables 313     AA 310     AAA Total U.S. structured finance $ 43,625     AAA $ 35,335     AAA   International Pooled corporate obligations $ 5,916 AAA $ 2,126 AAA Pooled infrastructure 4,294 AAA 4,616 AAA Mortgage-backed and home equity 3,932 AAA 3,351 AA+ Other structured finance 1,594 AAA 1,767 AAA Infrastructure 490 AAA 311 AAA Regulated utilities 450 AAA 259 AAA Future flow 98 BBB+ 158 A- Insurance securitizations 41 BBB 41 A- Public finance 9     AAA 49     A Total international $ 16,823     AAA $ 12,676     AAA   Total exposures $ 61,015     AAA $ 48,641     AAA     1. Some amounts may not add due to rounding. 2. Assured internal rating. Assured's scale is comparable to that of the nationally recognized rating agencies. Explanation of Non-GAAP Financial Measures: The following section defines the non-GAAP financial measure presented in this press release and describes why it is useful for investors. Present value of gross written premiums or PVP, which is a non-GAAP financial measure, is defined as gross upfront and installment premiums received and the present value of gross estimated future installment premiums on contracts written in the current period, discounted at 6% per year. Management believes that PVP is a useful measure for management, equity analysts and investors because it permits the evaluation of the value of new business production for Assured by taking into account the value of estimated future installment premiums on new contracts underwritten in a reporting period, which GAAP gross premiums written does not adequately measure. Actual future net earned or written premiums may differ from PVP due to factors such as prepayments, amortizations, refundings, contract terminations or defaults that may or may not be influenced by market interest rates, refinancing or refunding activity, prepayment speeds, policy changes or terminations, credit defaults, or other factors that management cannot control or predict. This measure should not be viewed as a substitute for gross written premiums determined in accordance with GAAP. Below is a reconciliation of PVP to gross written premiums:   Three Months Ended     September 30, (dollars in millions) 2007       2006 Premium analysis:     Gross written premiums (GWP) analysis: Present value of GWP (PVP) Financial guaranty direct $ 132.7 $ 90.9 Financial guaranty reinsurance 32.8       36.5 Total PVP 165.5 127.4 Less: Financial guaranty installment premium PVP 118.0       86.1 Upfront financial guaranty GWP 47.5 41.3 Plus: Financial guaranty installment GWP 40.3 30.3 Financial guaranty GWP 87.8 71.6 Plus: Mortgage guaranty segment GWP 1.4 1.9 Plus: Other segment GWP 0.1       0.1 Total gross written premiums $ 89.3       $ 73.6 Cautionary Statement Regarding Forward-Looking Statements: Any forward-looking statements made in this press release reflect the Company’s 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 that may cause actual results to differ materially from those set forth in these statements. For example, the Company’s forward looking statements, including its calculation of PVP and statements regarding losses, pricing and growth of the direct business could be affected by many events. These events include a significant reduction in the amount of reinsurance ceded by one or more of our principal ceding companies, rating agency action such as a ratings downgrade, difficulties with the execution of the Company’s business strategy, contract cancellations, developments or volatility in the world’s financial and capital markets, more severe or frequent losses associated with products affecting the adequacy of the Company’s loss reserves, changes in regulation or tax laws, governmental actions, natural catastrophes, the Company’s dependence on customers, decreased demand or increased competition, loss of key personnel, technological developments, the effects of mergers, acquisitions and divestitures, changes in accounting policies or practices, changes in general economic conditions, other risks and uncertainties that have not been identified at this time, management’s response to these factors, and other risk factors identified in the Company’s filings with the Securities and Exchange Commission. Readers are cautioned not to place undue reliance on these forward looking statements, which speak only as of the dates on which they are made. The Company undertakes no obligation to publicly update or revise any forward looking statements, whether as a result of new information, future events or otherwise.