Exhibit 4.1

0000001 SEE REVERSE FOR IMPORTANT NOTICE REGARDING OWNERSHIP AND TRANSFER RESTRICTIONS AND CERTAIN OTHER INFORMATION CUSIP XXXXXX XX X SEE REVERSE FOR CERTAIN DEFINITIONS INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE CLASS A COMMON STOCK SECRETARY CHIEF EXECUTIVE OFFICER SPECIMEN FULLY PAID CLASS A COMMON STOCK OF $0.0001 PAR VALUE, OF CARDINAL INFRASTRUCTURE GROUP INC. transferable on the books of the Company in person or by duly authorized attorney, upon surrender of this Certificate properly endorsed . This Certificate and the shares represented hereby are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as it may be amended, of the Company (copies of which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents . This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar . IN WITNESS WHEREOF, the facsimile seal of the Company and the facsimile signatures of its duly authorized officers . XX XX

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: TEN COM TEN ENT JT TEN - as tenants in common - as tenants by the entireties - as joint tenants with right of survivorship and not as tenants in common - trustee under Agreement dated TTEE Additional abbreviations may also be used though not in the above list. UNIF GIFT MIN ACT - Custodian (Cust) (Minor) under Uniform Gifts to Minors Act (State) For value received , hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE. Shares of the Class A Common Stock represented by this Certificate and do hereby constitute and appoint , attorney, to transfer the said stock on the books of the within - named Company with full power of substitution in the premises. DATED SIGNATURE GUARANTEED: THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C RULE 17Ad - 15. PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE. THE BOARD OF THIS CORPORATION HAS THE AUTHORITY TO CREATE AND DETERMINE THE RELATIVE RIGHTS AND PREFERENCES OF CLASSES OR SERIES OF SHARES OF CAPITAL STOCK OTHER THAN COMMON STOCK . THIS CORPORATION WILL FURNISH TO ANY SHAREHOLDER UPON WRITTEN REQUEST SENT TO ITS PRINCIPAL EXECUTIVE OFFICES, AND WITHOUT CHARGE, A FULL STATEMENT OF THE BOARD’S AUTHORITY TO CREATE AND DETERMINE THE RELATIVE RIGHTS AND PREFERENCES OF CLASSES OR SERIES OF SHARES OF CAPITAL STOCK AS WELL AS THE DESIGNATIONS, PREFERENCES, LIMITATIONS AND RELATIVE RIGHTS OF THE SHARES OF EACH CLASS OR SERIES THEN OUTSTANDING OR AUTHORIZED TO BE ISSUED . NOTICE: The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular without alteration or enlargement or any change whatever.

Cardinal Infrastructure Group Inc. S-1/A