UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q/A

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Period Ended June 30, 2010
or
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 001-31909

ASPEN INSURANCE HOLDINGS LIMITED

(Exact Name of Registrant as Specified in Its Charter)

Bermuda (State or other jurisdiction of incorporation or organization)	Not Applicable (I.R.S. Employer Identification No.)
Maxwell Roberts Building 1 Church Street Hamilton, Bermuda (Address of principal executive offices)	HM 11 (Zip Code)

Registrant’s telephone number, including area code
(441) 295-8201

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter periods that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes þ     No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes o     No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ Accelerated filer o Non-accelerated filer o Smaller reporting company o

(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o     No þ

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

As of August 5, 2010, there were 76,692,577 outstanding ordinary shares, with a par value of 0.15144558¢ per ordinary share, outstanding.

ASPEN INSURANCE HOLDINGS LIMITED EXPLANATORY NOTE

This Form 10-Q/A is being filed solely to present the financial information in the Extensible Business Reporting Language (XBRL) format and the information and content is the same as the Form 10-Q filed August 6, 2010. Exhibit 101 consists of information from Aspen Insurance Holding Limited’s Form 10-Q formatted in XBRL as follows:

101	. INS	XBRL Instance Document
101	. SCH	XBRL Taxonomy Extension Schema Document
101	. CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101	. PRE	XBRL Taxonomy Extension Presentation Linkbase Document

No other changes have been made to the Form 10-Q.

1

TABLE OF CONTENTS

PART II OTHER INFORMATION
	Item 6. Exhibits
	SIGNATURES
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

PART II

OTHER INFORMATION

Item 6.   Exhibits

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

Exhibit
Number			Description
	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 Richard Houghton, 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 Richard Houghton, 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.*
	101	. INS	XBRL Instance Document**
	101	. SCH	XBRL Taxonomy Extension Schema Document**
	101	. CAL	XBRL Taxonomy Extension Calculation Linkbase Document**
	101	. PRE	XBRL Taxonomy Extension Presentation Linkbase Document**

*	Filed as Exhibit to Aspen Insurance Holdings Limited’s Quarterly Report on Form 10-Q for the period ended June 30, 2010.
**	Furnished herewith.

2

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.

ASPEN INSURANCE HOLDINGS LIMITED

(Registrant)

Date: August 17, 2010

By:  /s/  Christopher O’Kane

Christopher O’Kane

Chief Executive Officer

Date: August 17, 2010

By:  /s/  Richard Houghton

Richard Houghton

Chief Financial Officer

3