Exhibit 99.3

ENSTAR GROUP LIMITED

UNAUDITED PRO FORMA CONDENSED COMBINED CONSOLIDATED

FINANCIAL STATEMENTS

The following preliminary unaudited pro forma condensed combined consolidated balance sheet as of September 30, 2013 is based on the historical financial statements of Enstar Group Limited (“Enstar”) and the consolidated results of Atrium Underwriting Group Ltd. (“Atrium”). It is presented as if Enstar had completed the acquisition of Atrium as of September 30, 2013.

The following preliminary unaudited pro forma statements of earnings are based on the historical financial statements of Enstar, the consolidated results of Atrium, and the consolidated results of the following significant acquisitions that Enstar completed during 2013: (i) HSBC Insurance Company of Delaware and Household Life Insurance Company of Delaware and their subsidiaries: Household Life Insurance Company, Household Life Insurance Company of Arizona, and First Central National Life Insurance Company of New York (the acquired companies collectively, the “Pavonia companies”) and (ii) Arden Reinsurance Company Ltd. (“Arden”).

On November 25, 2013, Kenmare Holdings Ltd. (“Kenmare”), a wholly-owned subsidiary of Enstar, together with Trident V, L.P., Trident V Parallel Fund, L.P. and Trident V Professionals Fund, L.P. (collectively, “Trident”), completed the acquisition of Atrium from Arden Holdings Ltd. The purchaser of Atrium, Alopuc Limited, is 100% owned by Northshore Holdings Limited (“Northshore”), which is 60% owned by Kenmare and 40% owned by Trident.

On March 31, 2013, a wholly-owned subsidiary of Enstar completed the acquisition of the Pavonia companies. On September 9, 2013, Kenmare and Trident, through Northshore, completed the acquisition of Arden from Arden Holdings Ltd. Pavonia and Arden are not separately included in the preliminary unaudited pro forma condensed combined consolidated balance sheet as of September 30, 2013 because the acquisitions were reflected in Enstar’s actual balance sheet as of September 30, 2013, which was included within Enstar’s Quarterly Report on Form 10-Q filed with the U.S Securities and Exchange Commission (“SEC”) on November 7, 2013.

The preliminary unaudited pro forma condensed combined consolidated statement of earnings for the nine months ended September 30, 2013 is presented as if Enstar had completed the acquisitions of Pavonia, Arden, and Atrium as of January 1, 2013. The preliminary unaudited pro forma condensed combined consolidated statement of earnings for the year ended December 31, 2012 is presented as if Enstar had completed the acquisitions of Pavonia, Arden, and Atrium as of January 1, 2012.

The preliminary unaudited condensed combined consolidated pro forma financial information reflects the purchase of Atrium under the purchase method of accounting for business combinations and represents a current estimate of the financial information based on information available as of the date of this Current Report on Form 8-K/A. The preliminary unaudited pro forma information includes adjustments to record the assets and liabilities of Atrium at their estimated fair values under the purchase method of accounting for business combinations. The excess of the acquisition consideration over the fair value of the assets acquired and liabilities assumed, if any, is allocated to goodwill. A final determination of the acquisition consideration and fair values of Atrium’s assets and liabilities will be based on the actual net tangible and intangible assets of Atrium that existed on November 25, 2013, the date the transaction was completed. To the extent there are significant changes to Atrium’s business, the assumptions and estimates herein could change significantly.

The preliminary unaudited pro forma financial information is presented for informational purposes only under one set of assumptions and does not reflect the financial results of the combined companies had consideration been given to other assumptions or to the impact of possible operating efficiencies, asset dispositions, and other factors. Further, the pro forma financial information does not necessarily reflect the historical results of the combined companies that actually would have occurred had the transaction been in effect during the periods indicated or that may be obtained in the future.

The preliminary unaudited pro forma condensed combined consolidated financial information should be read in conjunction with:

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Enstar Group Limited

Preliminary Unaudited Pro Forma Condensed Combined Consolidated Balance Sheet

As of September 30, 2013

(Expressed in thousands of U.S. dollars)

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Enstar Group Limited

Preliminary Unaudited Pro Forma Condensed Combined Consolidated Statement of Earnings

For the Nine Months Ended September 30, 2013

(Expressed in thousands of U.S. dollars)

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Enstar Group Limited

Preliminary Unaudited Pro Forma Condensed Combined Consolidated Statement of Earnings

For the Year Ended December 31, 2012

(Expressed in thousands of U.S. dollars)

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1. Acquisition Consideration Allocation

Under the acquisition method of accounting, the total acquisition consideration is allocated to the acquired tangible and identifiable intangible assets and assumed liabilities of Atrium based on their estimated fair values as of the closing of the transaction. The excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed, if any, is allocated to goodwill.

The preliminary unaudited pro forma adjustments included herein are subject to update as additional information becomes available and as additional analysis is performed. The final allocation of the purchase price will be determined after completion of a thorough analysis to determine the fair values of Atrium’s tangible and identifiable intangible assets and liabilities. Accordingly, the final amounts allocated to assets acquired and liabilities assumed could differ significantly from the amounts presented in the preliminary unaudited pro forma consolidated financial statements.

The total acquisition consideration is allocated to Atrium’s tangible and identifiable intangible assets and liabilities as of September 30, 2013 based on their preliminary fair values as follows:

Approximately $102.3 million has been preliminarily allocated to amortizable intangible assets acquired. The amortization related to the preliminary fair value of amortizable intangible assets is reflected as a pro forma adjustment to the unaudited pro forma consolidated financial statements.

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Identifiable intangible assets. The preliminary fair values of intangible assets were determined based on the provisions of Accounting Standards Codification (ASC) 805, Business Combinations, which defines fair value in accordance with ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Intangible assets were identified that met either the separability criterion or the contractual-legal criterion described in ASC 805. The preliminary allocation to intangible assets is as follows:

Goodwill. Goodwill represents the excess of the acquisition consideration over the preliminary fair value of the underlying net tangible and intangible assets. Among the factors that contributed to a purchase price in excess of the fair value of the identifiable net tangible and intangible assets are the skill sets, operations and synergies that can be leveraged to enable the combined company to build a stronger enterprise. According to ASC 805, an assembled workforce does not represent the intellectual capital of this workforce, it only represents an existing collection of employees. As such, it is not an identifiable asset and is therefore recognized as part of goodwill.

In accordance with ASC 350, Intangibles-Goodwill and Other, goodwill will not be amortized, but instead will be tested for impairment at least annually and whenever events or circumstances have occurred that may indicate a possible impairment. If management determines that the value of goodwill has become impaired, Enstar will incur a charge to earnings for the amount of the impairment during the period in which the determination is made.

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2. Unaudited Pro Forma and Acquisition Accounting Adjustments

The unaudited pro forma financial information is not necessarily indicative of what the financial position and results from operations actually would have been had the transactions been completed at the dates indicated and includes adjustments which are preliminary and may be revised. Such revisions may result in material changes. The financial position shown herein is not necessarily indicative of what the past financial position of the combined companies would have been, nor necessarily indicative of the financial position of the post-transaction periods.

The following unaudited pro forma adjustments result from accounting for the transactions, including the determination of fair value of the assets, liabilities, and commitments which Enstar, as the acquirer for accounting purposes, will acquire and assume from the acquired companies. The descriptions related to these preliminary adjustments are as follows:

Balance Sheet:

Income Statement:

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