NAUGATUCK VALLEY FINANCIAL CORPORATION ORGANIZED UNDER THE LAWS OF THE STATE OF MARYLAND

Exhibit 4.0

NAUGATUCK VALLEY FINANCIAL CORPORATION

ORGANIZED UNDER THE LAWS OF THE STATE OF MARYLAND

THIS CERTIFIES THAT

FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK $0.01 PAR VALUE

PER SHARE OF NAUGATUCK VALLEY FINANCIAL CORPORATION

The shares represented by this certificate are transferable only on the stock transfer books of Naugatuck Valley Financial Corporation (the “Corporation”) by the holder of record hereof, or by his duly authorized attorney or legal representative, upon the surrender of this certificate properly endorsed. This certificate and the shares represented hereby are issued and shall be held subject to all the provisions of the Articles of Incorporation of the Corporation and any amendments thereto (copies of which are on file with the Corporate Secretary of the Corporation), to all of which provisions the holder by acceptance hereof, assents.

The shares evidenced by this certificate are not of an insurable type and are not insured by the Federal Deposit Insurance Corporation.

IN WITNESS WHEREOF, NAUGATUCK VALLEY FINANCIAL CORPORATION has caused this certificate to be executed by the signatures of its duly authorized officers and has caused its corporate seal to be hereunto affixed.

Dated: _______, 2010

[SEAL]

The Board of Directors of the Corporation is authorized by resolution(s), from time to time adopted, to provide for the issuance of serial preferred stock in series and to fix and state the voting powers, designations, preferences and relative, participating, optional, or other special rights of the shares of each such series and the qualifications, limitations and restrictions thereof. The Corporation will furnish to any shareholder upon request and without charge a full description of each class of stock and any series thereof.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

For value received                      hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFICATION NUMBER OF ASSIGNEE

                                                                                       shares of the common stock represented by this certificate and do hereby irrevocably constitute and appoint                                                                                                                                            , attorney, to transfer the said stock on the books of the within-named bank with full power of substitution in the premises.