OREANDA-NEWS. Fitch Ratings has affirmed Arch Capital Group Ltd.'s (ACGL) Issuer Default Rating (IDR) at 'A' and the ratings on ACGL's senior unsecured notes and preferred shares at 'A-' and 'BBB+', respectively. Additionally, Fitch has affirmed the Insurer Financial Strength (IFS) ratings of ACGL's various subsidiaries at 'A+'. The Rating Outlook has been revised to Stable from Positive. A complete list of ratings is provided at the end of this release.

KEY RATING DRIVERS

Fitch's affirmation of ACGL's ratings reflects the company's reasonable financial leverage, strong fixed charge coverage, diversified market position in both insurance and reinsurance lines, solid capitalization and well-managed reserve risk. These favorable factors are partially offset by exposure to possible adverse reserve development due to the relatively large portion of casualty reserves, potential risks associated with its expanding mortgage operations and possible volatility from large catastrophe-related events

The Outlook revision to Stable from Positive reflects the shifting market landscape in both commercial insurance and reinsurance business that is pressuring profitability and leading to consolidation as companies aim to enhance their relative competitive position. ACGL has favorably achieved steady growth in capital over time and maintains a medium market position and size/scale. The company's overall market position, however, trails several of its' higher rated (re)insurance peers that maintain a large market presence.

The ratings also reflect Fitch's negative sector outlook on global reinsurance. The current stressful reinsurance market conditions, with record capitalization levels of traditional reinsurers and the growing capacity provided by alternative capital providers, are promoting weaker pricing and more generous terms and conditions.

ACGL has a broad product portfolio of property/casualty primary insurance, reinsurance and mortgage (re)insurance business. Total company first half 2015 net premiums written ($2.0 billion) segment split was 52% insurance, 30% reinsurance, 6% mortgage and 12% other (Watford Re, a multi-line casualty reinsurer approximately 11% owned, but fully consolidated into ACGL). Fitch views this diversified source of revenues and earnings favorably as it provides the company flexibility to deemphasize various products when market conditions are poor and reduces its dependency on any single product line.

ACGL's profitability is strong, characterized by low and stable combined ratios and high returns on average common equity (ROAE). The most recent five-year averages (2010-2014) of 91.9% and 14%, respectively, are in line with or better than peer averages and align with Fitch's median 'AA' and 'AAA' (re)insurance sector credit factors. Through the first six months of 2015, ACGL reported a combined ratio of 89.2% and annualized ROAE of 13.4%. ACGL has posted an underwriting profit and overall net income in every year of its 13-year operating history.

The company's financial leverage ratio is modest at 12.7% as of June 30, 2015, down from 12.9% at year-end 2014. This slight decline reflects flat growth in first half 2015 shareholders' equity available to ACGL of $6.1 billion at both June 30, 2015 and year-end 2014 as net earnings were offset by increased share repurchases and preferred share dividends. Fixed charge coverage was a strong 12.1x through the first half of 2015, up from 11.5x in 2014.

RATING SENSITIVITIES

Key rating triggers that could result in an upgrade include improvement in ACGL's competitive market position while demonstrating favorable run-rate earnings and low volatility in the challenging (re)insurance environment, with a combined ratio in the low 90s; successfully managing both the mortgage operations and the Watford Re platform, with exposure growth prudently managed. In addition, continued growth in equity while maintaining a net written premiums-to-equity ratio of 0.8x or lower, a financial leverage ratio at or below 20%, and fixed charge coverage of at least 10x could generate positive rating pressure.

Key rating triggers that could result in a downgrade include sizable adverse prior year reserve development or difficulties experienced in the mortgage insurance operations or Watford Re platform. In addition, increases in underwriting leverage above 1.0x net written premiums-to-equity ratio or a financial leverage ratio above 25% could generate negative rating pressure. Also, if ACGL's capital from foreign subsidiaries outside of the Bermuda group solvency environment increased to 35% or more (32% at year-end 2014), the holding company ratings could be lowered reflecting a ring-fencing environment classification.

FULL LIST OF RATING ACTIONS

Fitch affirms the following ratings with a Stable Outlook:

Arch Capital Group, Ltd.
--IDR at 'A';
--$300 million 7.35% senior unsecured notes due 2034 at 'A-';
--$325 million 6.75% series C non-cumulative preferred shares at 'BBB+'.

Arch Capital Group (U.S.) Inc.
--$500 million 5.144% senior notes due 2043 at 'A-';

Arch Reinsurance Ltd.
Arch Reinsurance Company
Arch Reinsurance Europe Underwriting Limited
Arch Insurance Company
Arch Excess and Surplus Insurance Company
Arch Specialty Insurance Company
Arch Indemnity Insurance Company
Arch Insurance Company (Europe) Limited
--IFS at 'A+'.