UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended September 30, 2010

Commission File Number 000-23554

INTERNATIONAL ASSETS HOLDING CORPORATION

(Exact name of registrant as specified in its charter)

708 Third Avenue, Suite 1500

New York, NY 10017

(Address of principal executive offices) (Zip Code)

(212) 485-3500

(Registrant’s telephone number, including area code)

Securities registered under Section 12(b) of the Exchange Act:

Securities registered under Section 12(g) of the Exchange Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

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 period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

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  ¨    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

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 definitions of “accelerated filer”, “large accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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

As of March 31, 2010, the aggregate market value of the common stock held by non-affiliates of the registrant was approximately $168.6 million.

As of December 10, 2010, there were 17,612,522 shares of the registrant’s common stock outstanding.

INTERNATIONAL ASSETS HOLDING CORPORATION

ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED SEPTEMBER 30, 2010

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive Proxy Statement for the Registrant’s Annual Meeting of Stockholders to be held on February 24, 2011 are incorporated by reference into Part III of this Annual Report on Form 10-K.

Explanatory Note

International Assets Holding Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended September 30, 2010, which was originally filed on December 15, 2010 (the “Original Filing”), to amend the cover page to the Form 10-K to correct the number of shares of the registrant’s common stock outstanding as of December 10, 2010. The Original Filing incorrectly stated that there were 10,612,522 outstanding shares as of December 10, 2010. The correct number is 17,612,522 shares.

Pursuant to Rule 12b-15 under the Securities and Exchange Act of 1934, as amended, this Amendment amends the Original Filing and contains new certifications pursuant to Section 302 and 906 of the Sarbanes-Oxley Act of 2002. This Amendment does not affect any other parts of, or exhibits to the Original Filing, and those unaffected parts or exhibits are not included in this Amendment. Except as expressly stated in this Amendment, the Original Filing continues to speak as of the date of the Original Filing, and we have not updated the disclosure contained in the Amendment to reflect events that have occurred since the filing of the Original Filing.

SIGNATURES

In accordance with Section 13 or 15(d) of the Securities and Exchange Act of 1934, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit Index