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                                                                    EXHIBIT 4.01



ONESOURCE INFORMATION SERVICES, INC.                  COMMON STOCK

INCORPORATED UNDER THE LAWS OF DELAWARE

SEE REVERSE FOR CERTAIN DEFINITIONS AND RESTRICTIONS
CUSIP 68272J 10 6

THIS CERTIFIES THAT


IS THE OWNER OF
FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $.01 PAR VALUE, OF

                      ONESOURCE INFORMATION SERVICES, INC.

transferable on the books of the Corporation by the holder hereof in person or
by a duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate is not valid until countersigned by the Transfer
Agent and registered by the Registrar.

         WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated

                  Secretary                           Chief Executive Officer

COUNTERSIGNED AND REGISTERED:
AMERICAN STOCK TRANSFER & TRUST COMPANY
TRANSFER AGENT AND REGISTRAR

AUTHORIZED SIGNATURE

                      ONESOURCE INFORMATION SERVICES, INC.

         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 - as tenants in common UNIF GIFT MIN ACT - _________ Custodian ________ 
TEN ENT - as tenants by the entireties               (Cust)             (Minor)
JT TEN - as joint tenants with               under Uniform Gifts to Minors
         right of survivorship and
         not as tenants in common            Act _______________________________
                                                            (State)

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


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         For value received, _________________________ hereby sell, assign and
transfer unto PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER
OF ASSIGNEE

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE

Shares of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint___________________ Attorney to transfer the
said stock on the books of the within-named Corporation with full power of
substitution in the premises. 
Dated, ________________________      ___________________________________________
                                     Notice: The signature(s) to this assignment
                                     must correspond with the name(s) as written
                                     upon the face of the certificate, in every
                                     particular, without alteration or
                                     enlargement, or any change whatever.

Signature Guaranteed: __________________________________________________________
                      The signature(s) must 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.