File Nos. 333-21311 and 811-8049

As filed with the Securities and Exchange Commission on February 17, 2011

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

Pre-Effective Amendment No.

Post-Effective Amendment No. 19

AND

  REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 21

RENAISSANCE CAPITAL GREENWICH FUNDS

(Exact Name of Registrant as Specified in Charter)

2 Greenwich Plaza

Greenwich, Connecticut 06830

(Address of Principal Executive Office) (Zip Code)

Registrant’s Telephone Number, including Area Code: (203) 622-2978

 Lillian R. Killian, C.F.A.

 2 Greenwich Plaza

Greenwich, Connecticut 06830

(Name and Address of Agent for Service)

Copy to:

Thomas R. Westle, Esq.

Blank Rome LLP

The Chrysler Building

405 Lexington Avenue

New York, New York 10174

Approximate Date of Proposed Public Offering

It is proposed that this filing will become effective:

    [X] immediately upon filing pursuant to paragraph (b)

    [   ] on January 31, 2011 pursuant to paragraph (b)

    [   ] 60 days after filing pursuant to paragraph (a)(1)

    [   ] on, pursuant to paragraph (a)(1)

    [   ] 75 days after filing pursuant to paragraph (a)(2)

    [   ] on (date) pursuant to paragraph (a) (2), of rule 485 (b)

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Greenwich, and the State of Connecticut on this 17th day of  February, 2011.

RENAISSANCE CAPITAL GREENWICH FUNDS

By:  

/s/William K. Smith

               William K. Smith, President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to its Registration Statement has been signed below by the following persons in the capacities indicated on the 17th day of February, 2011.

/s/ William K. Smith

William K. Smith                 

President

/s/ Kathleen Shelton Smith

Kathleen Shelton Smith        

Vice President, Treasurer,

Investment Officer, Chief Compliance Officer, Chairperson and Trustee

/s/ Linda R. Killian

Linda R. Killian    

Vice President, Secretary and

Investment Officer

Warren K. Greene                                

Warren K. Greene*

Trustee

Gerald W. Puschel

Gerald W. Puschel*

Trustee

/s/Kathleen Shelton Smith

By  Kathleen Shelton Smith

     *Attorney In Fact

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase