As filed with the Securities and Exchange Commission on July 9, 2014

Registration No. 333-            

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

MALIBU BOATS, INC.

(Exact Name of Registrant as specified in its charter)

5075 Kimberly Way

Loudon, Tennessee 37774

(865) 458-5478

(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)

Wayne R. Wilson

Chief Financial Officer

5075 Kimberly Way

Loudon, Tennessee 37774

(865) 458-5478

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of propose sale to the public: As soon as practicable after effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  x 333-197095

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

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 “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

This Registration Statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) promulgated under the Securities Act of 1933, as amended.

CALCULATION OF REGISTRATION FEE

EXPLANATORY NOTE

This registration statement is being filed by Malibu Boats, Inc. (the “Company”) pursuant to Rule 462(b) (“Rule 462(b)”) under the Securities Act of 1933, as amended (the “Securities Act”), and General Instruction V of Form S-1. Pursuant to Rule 462(b), the contents of the Company’s registration statement on Form S-1 (File No. 333-197095), including the exhibits thereto, which was declared effective by the Securities and Exchange Commission (the “Commission”) on July 9, 2014 (the “Initial Registration Statement”), are incorporated by reference into this registration statement. This registration statement covers the registration of an additional 920,000 of the Company’s Class A common stock, described in the prospectus constituting a part of the Initial Registration Statement.

The required opinions and consents are listed on an Exhibit Index attached hereto and filed herewith.

CERTIFICATION

The Registrant hereby certifies to the Securities and Exchange Commission that (1) it has instructed its bank to pay the filing fee set forth on the cover page of this Registration Statement by a wire transfer of such amount to the Commission’s account at U.S. Bank as soon as practicable (but no later than the close of business as of July 10, 2014), (2) it will not revoke such instructions, (3) it has sufficient funds in the relevant account to cover the amount of such filing fee and (4) it will confirm receipt of such instructions by its bank during regular business hours no later than July 10, 2014.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

(a) Exhibits.

All the exhibits filed with Initial Registration Statement (File No. 333-197095) are incorporated by reference into, and shall be deemed part of, this registration statement, except the following, which are filed herewith:

II-1

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Loudon, State of Tennessee, on July 9, 2014.

POWER OF ATTORNEY

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons on behalf of the Registrant in the capacities and on the dates indicated:

EXHIBIT

INDEX