| [_] | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR 12(g) OF THESECURITIES EXCHANGE ACT OF 1934 |   |
|-----|-------------------------------------------------------------------------------------------------|--------|

| [X] | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 |   |
|-----|-------------------------------------------------------------------------------------|--------|

| [_] | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 |   |
|-----|-----------------------------------------------------------------------------------------|--------|

| [_] | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 |   |
|-----|--------------------------------------------------------------------------------------------|--------|

| SEANERGY MARITIME HOLDINGS CORP.                                                                                                                                                                  |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (Exact name of Registrant as specified in its charter)                                                                                                                                            |
|                                                                                                                                                                                              |
|                                                                                                                                                                                              |
| (Translation of Registrant's name into English)                                                                                                                                                   |
|                                                                                                                                                                                              |
|                                                                                                                                                                                              |
| Republic of the Marshall Islands                                                                                                                                                                  |
| (Jurisdiction of incorporation or organization)                                                                                                                                                   |
|                                                                                                                                                                                              |
| 1-3 Patriarchou Grigoriou Street, 166 74 Glyfada, Athens, Greece                                                                                                                                  |
| (Address of principal executive offices)                                                                                                                                                          |
|                                                                                                                                                                                              |
| Stamatis Tsantanis, Chief Executive OfficerSeanergy Maritime Holdings Corp.1-3 Patriarchou Grigoriou Street, 166 74 Glyfada, Athens, GreeceTelephone: 011-30 210 8931507, Fax: 011-30 210 9638450 |
| (Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)                                                                                                           |

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| Title of class                                      | Name of exchange on which registered |
|-----------------------------------------------------|--------------------------------------|
| Shares of common stock, par value $0.0001 per share | NASDAQ Capital Market                |

| Large accelerated filer [ ] | Accelerated filer [ ] | Non-accelerated filer [X] |
|-----------------------------|-----------------------|---------------------------|

| U.S. GAAP [X] | International Financial Reporting Standards as issued by the International Accounting Standards Board [_] | Other [_] |
|---------------|-----------------------------------------------------------------------------------------------------------|-----------|

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| Exhibits | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| 101      | The following financial information from Seanergy Maritime Holding Corp.'s Annual Report on Form 20-F for the fiscal year ended December 31, 2012, filed with the SEC on April 26, 2013, formatted in Extensible Business Reporting Language (XBRL): (1) Consolidated Balance Sheets as of December 31, 2012 and 2011;(2) Consolidated Statements of Income/(loss) for the years ended December 31, 2012, 2011 and 2010;(3) Consolidated Statements of Changes in Equity for the years ended December 31, 2012, 2011 and 2010;(4) Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010;(5) Notes to Consolidated Financial Statements.  |

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|               |   |                             |   |                    |
|--------------------|--------|----------------------------------|--------|-------------------------|
|               |   | SEANERGY MARITIME HOLDINGS CORP. |
|               |   | (Registrant)                     |
|               |   |                             |
| Date: May 28, 2013 |   | By:                              |   | /s/ Stamatis Tsantanis  |
|               |   |                             |   | Stamatis Tsantanis      |
|               |   |                             |   | Chief Executive Officer |