As filed with the Securities and Exchange Commission on January 30, 2014

Registration No.                    

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

MONTAGE TECHNOLOGY GROUP LIMITED

(Exact name of registrant as specified in its charter)

Room A1601, Technology Building, 900 Yi Shan Road

Xuhui District, Shanghai, 200233

People’s Republic of China

Tel: (86 21) 6128-5678

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

Mark Voll

Chief Financial Officer

2025 Gateway Place, Suite 262

San Jose CA 95110

Tel: 408-982-2788

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

Copies of Communications to:

Approximate date of commencement of proposed sale to public: As soon as practicable after the effective date of this Registration Statement.

If any 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 333-193417

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. (Check one):

CALCULATION OF REGISTRATION FEE

The registration statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) under the Securities Act of 1933, as amended.

EXPLANATORY NOTE AND INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

This Registration Statement is being filed with the Securities and Exchange Commission (the “Commission”) pursuant to Rule 462(b) under the Securities Act of 1933, as amended. This Registration Statement relates to the public offering of ordinary shares, par value $0.0125 per share, of the Registrant contemplated by the Registration Statement on Form S-1, as amended (File No. 333-193417), initially filed with the Commission by the Registrant on January 17, 2014 (as amended, the “Prior Registration Statement”), and is being filed for the sole purpose of registering additional securities of the same class as were included in the Prior Registration Statement. The contents of the Prior Registration Statement and all exhibits thereto are hereby incorporated by reference.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this registration statement on Form S-1 to be signed on its behalf by the undersigned, thereunto duly authorized, in Shanghai, on January 30, 2014.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities indicated on January 30, 2014.

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