As filed with the Securities and Exchange Commission on August 1, 2013.

Registration No. 333-            

UNITED STATES SECURITIES AND EXCHANGE

COMMISSION

Washington, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

Under

THE SECURITIES ACT OF 1933

Marrone Bio Innovations, Inc.

(Exact name of registrant as specified in its charter)

2121 Second St. Suite A-107

Davis, CA 95618

(530) 750-2800

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

Pamela G. Marrone, Ph.D.

President and Chief Executive Officer

Marrone Bio Innovations, Inc.

2121 Second St. Suite A-107

Davis, CA 95618

(530) 750-2800

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

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after the 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, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  x  333-189753

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

CALCULATION OF REGISTRATION FEE

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

EXPLANATORY NOTE

This Registration Statement is being filed pursuant to Rule 462(b) as promulgated under the Securities Act of 1933, as amended, and includes the registration statement facing page, this page, the signature page, an exhibit index and the required opinion and consents solely to register an additional 632,500 shares of the registrant’s common stock, par value $0.00001 per share. The contents of the Registration Statement on Form S-1 (Registration No. 333-189753), including the exhibits and power of attorney thereto, which was declared effective by the Securities and Exchange Commission on August 1, 2013, are incorporated by reference in this Registration Statement.

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 Mellon Bank as soon as practicable (but no later than the close of business as of August 2, 2013), (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 August 2, 2013.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, we have duly caused this Registration Statement on Form S-1 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Davis, State of California, on August 1, 2013.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement on Form S-1 has been signed by the following persons in the capacities and on the dates indicated.

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