Bermuda underwriters Arch Capital Group Ltd. and Maiden Holdings Ltd. and reinsurer PartnerRe Ltd. have released estimates of losses related to Superstorm Sandy.

Arch said Wednesday that its preliminary estimate of losses related to Sandy ranges between $170 million and $240 million, net of reinsurance and the effects of reinstatement premiums.

The Hamilton, Bermuda-based underwriter said the preliminary loss estimate is based on projected industry insured losses ranging from $20 billion to $25 billion. “The losses from the storm are currently estimated to arise approximately 40% in our insurance operations and 60% in our reinsurance operations,” said Arch in a statement.

Arch said its preliminary estimates for the storm are based on available information derived from modeling techniques, industry assessments of exposure, preliminary claims information obtained from the company's clients and brokers to date and a review of in-force contracts, and that actual losses “from this event may vary materially from the estimates due to the inherent uncertainties in making such determinations resulting from several factors,” including, among other things, the preliminary nature of available information, the potential inaccuracies and inadequacies in the data provided by clients and brokers, and modeling techniques and the application of such techniques.

Meanwhile, Maiden Holdings, another Hamilton-based underwriter, reported Wednesday that it expects the underwriting impact from Superstorm Sandy, net of applicable reinsurance and the company's quarterly provision for normalized catastrophe losses to be in the range of between $25 million and $35 million.

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“Maiden's exposure to this event emanates predominantly from the company's E&S property insurance business, Maiden Specialty, and to a lesser extent from the U.S. assumed treaty reinsurance business,” said Maiden in its statement.

PartnerRe said Wednesday that it expects to record a charge related to Superstorm Sandy of between $200 million and $240 million pretax, net of retrocession and reinstatement premiums, in its fourth-quarter 2012 results.

The Hamilton-based company estimated that the majority of its losses will come from accounts with commercial line exposures.

“A number of business lines written by the company are impacted by Superstorm Sandy, including catastrophe treaties, property per-risk treaties, marine treaties, engineering treaties and facultative policies,” said PartnerRe in a statement announcing the loss estimates.

PartnerRe added that the final loss could differ materially from the current estimate.