<PAGE>   1

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 17, 1999

                                                   REGISTRATION NO. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                      ONESOURCE INFORMATION SERVICES, INC.
             (Exact Name of Registrant as Specified in Its Charter)

          DELAWARE                                       04-3204522
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
 Incorporation or Organization)

                                300 BAKER AVENUE
                                CONCORD, MA 01742
               (Address of Principal Executive Offices) (Zip Code)

                              --------------------

                       1993 STOCK PURCHASE AND OPTION PLAN
                      1999 STOCK OPTION AND INCENTIVE PLAN
                        1999 EMPLOYEE STOCK PURCHASE PLAN
                            (Full Title of the Plan)

                              --------------------

                               DANIEL J. SCHIMMEL
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                      ONESOURCE INFORMATION SERVICES, INC.
                                300 BAKER AVENUE
                                CONCORD, MA 01742
                     (Name and Address of Agent For Service)

                                 (978) 318-4300
          (Telephone Number, Including Area Code, of Agent For Service)

                              --------------------
                                   Copies to:

                          LAWRENCE S. WITTENBERG, ESQ.
                         Testa, Hurwitz & Thibeault, LLP
                                 125 High Street
                           Boston, Massachusetts 02110
                                 (617) 248-7000

================================================================================


<PAGE>   2


================================================================================

                         CALCULATION OF REGISTRATION FEE

================================================================================

<TABLE>
<CAPTION>

                                                                                     PROPOSED
                                                            PROPOSED MAXIMUM          MAXIMUM
TITLE OF SECURITIES TO BE               AMOUNT TO BE         OFFERING PRICE          AGGREGATE            AMOUNT OF
       REGISTERED                      REGISTERED (1)         PER SHARE (3)        OFFERING PRICE      REGISTRATION FEE
-------------------------              --------------        ---------------        ---------------    ----------------
<S>                                  <C>                          <C>               <C>                  <C>
1993 STOCK PURCHASE AND OPTION PLAN

OneSource Information                 727,344 shares (2)         $0.12             $    87,281.28         $   24.26
Services, Inc. Common Stock,        1,359,994 shares (2)         $1.37             $ 1,863,191.80         $  517.97
$.01 par value                      1,444,649 shares (2)         $2.19             $ 3,163,781.30         $  879.53
                                       30,525 shares (2)         $5.90             $   180,097.50         $   50.07
                                      328,459 shares (2)         $9.97             $ 3,274,736.20         $  910.38

1999 STOCK OPTION AND INCENTIVE PLAN

OneSource Information                 800,000 shares             $6.5625 (4)       $ 5,250,000.00         $1,459.50
Services, Inc. Common Stock,
$.01 par value

1999 EMPLOYEE STOCK PURCHASE PLAN

OneSource Information                 100,000 shares             $6.5625 (4)       $   656,250.00         $  182.44
Services, Inc. Common Stock,
$.01 par value

TOTAL:                              4,790,971 shares                               $14,475,338.00         $4,024.15
                                                                                   ==============         =========
</TABLE>


(1)      All share numbers are adjusted to reflect a 2.035 for 1 stock split
         effected by the Company on May 7, 1999.

(2)      Based on options to purchase 3,890,971 shares of the Company's Common
         Stock outstanding as of August 16, 1999 under the Company's 1993 Stock
         Purchase and Option Plan. All of such shares are issuable upon the
         exercise of outstanding options to purchase the number of shares at the
         exercise price listed above. Pursuant to Rule 457(h)(1), the aggregate
         offering price and the fee have been computed upon the basis of the
         price at which the options may be exercised.

(3)      Pursuant to Rule 457(h)(1), the aggregate offering price and the fee
         have been computed upon the basis of the price at which the options may
         be exercised.

                                      -2-
<PAGE>   3

(4)      The price of $6.5625 per share, which is the average of the high and
         low prices of the Common Stock of the registrant reported on the Nasdaq
         National Market on August 11, 1999, is set forth solely for purposes of
         calculating the filing fee pursuant to Rules 457(c) and (h).


                                      -3-

<PAGE>   4

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

ITEM 1.  PLAN INFORMATION.

         The documents containing the information specified in this Item 1 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Securities and
Exchange Commission (the "Commission") and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this
registration statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

ITEM 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

         The documents containing the information specified in this Item 2 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Commission and
the instructions to Form S-8, such documents are not being filed with the
Commission either as part of this registration statement or as prospectuses or
prospectus supplements pursuant to Rule 424.


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed by OneSource Information Services, Inc.
(the "Company" or the "Registrant") with the Commission pursuant to the
Securities Act of 1933, as amended (the "Act"), or the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), as noted, are incorporated in this
registration statement by reference as of their respective dates:

         (a)      The Registrant's Prospectus, as contained within the
                  Registrant's Registration Statement on Form S-1, as amended,
                  (SEC File No. 333-73263) filed with the Commission pursuant to
                  the Act which contains audited financial statements for the
                  fiscal year ended December 31, 1998 and unaudited financial
                  statements for the three months ended March 31, 1999 (the "S-1
                  Registration Statement").

         (b)      The section entitled "Description of Registrant's Securities
                  to be Registered" contained in the Registrant's Registration
                  Statement on Form 8-A, as amended, filed with the Commission
                  pursuant to Section 12(g) of the Exchange Act on April 22,
                  1999.

         (c)      The Registrant's Quarterly Report on Form 10-Q as filed with
                  the Commission on August 13, 1999.

         All documents subsequently filed with the Commission by the Registrant
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the
filing of a post-effective amendment which indicates that all securities offered
herein have been sold or which deregisters all securities then remaining unsold,
shall be deemed to be incorporated by reference in this registration statement
and to be a part hereof from the date of filing of such documents.

                                      -4-
<PAGE>   5

ITEM 4.  DESCRIPTION OF SECURITIES.

         Not applicable.

ITEM 5.  INTEREST OF NAMED EXPERTS AND COUNSEL.

         Not applicable.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Company's Second Amended and Restated Certificate of Incorporation
generally provides for indemnification of the Company's directors and officers
for liabilities and expenses that they may incur in such capacities, to the
extent allowed under the Delaware General Corporation Law. Reference is made to
the Company's Second Amended and Restated Certificate of Incorporation filed as
Exhibit 3.01 to the Company's S-1 Registration Statement.

                                      -5-
<PAGE>   6


         The Underwriting Agreement dated as of May 18, 1999, by and among the
Company, the Underwriters listed on Schedule A thereto (the "UNDERWRITERS") and
the parties listed on Schedules B-1 and B-2 thereto (the "UNDERWRITING
AGREEMENT") provides that the Underwriters are obligated, under certain
circumstances, to indemnify the Company, its directors, its officers who signed
the S-1 Registration Statement and controlling persons of the Company against
certain liabilities, including liabilities under the Securities Act of 1933, as
amended (the "SECURITIES ACT"). Reference is made to the form of Underwriting
Agreement filed as Exhibit 1.01 to the Company's S-1 Registration Statement.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.


ITEM 8.  EXHIBITS.
<TABLE>
<CAPTION>

EXHIBIT NO.       DESCRIPTION OF EXHIBIT
-----------       ----------------------
<S>               <C>

    4.1        Specimen Certificate for shares of the Company's Common Stock
               (Incorporated by reference to Exhibit 4.01 to the S-1
               Registration Statement).

    4.2        Description of Capital Stock (contained in the Second Amended and
               Restated Certificate of Incorporation of the Company
               (Incorporated by reference to Exhibit 3.01 to the S-1
               Registration Statement)).

    4.3        1993 Stock Purchase and Option Plan (Incorporated by reference to
               Exhibit 10.01 to the S-1 Registration Statement).

    4.4        1999 Stock Option and Incentive Plan (Incorporated by reference
               to Exhibit 10.02 to the S-1 Registration Statement).

    4.5        1999 Employee Stock Purchase Plan (Incorporated by reference to
               Exhibit 10.03 to the S-1 Registration Statement).

    5.1        Opinion of Testa, Hurwitz & Thibeault, LLP.

   23.1        Consent of PricewaterhouseCoopers LLP.

   23.2        Consent of Testa, Hurwitz & Thibeault, LLP (included in
               Exhibit 5.1).

   24.1        Power of Attorney (found on the signature page of this
               registration statement).
</TABLE>

ITEM 9.  UNDERTAKINGS.

         (a)      The undersigned Registrant hereby undertakes:

                  (1) To file, during any period in which offers or sales are
                  being made, a post-effective amendment to this registration
                  statement:

                                      -6-
<PAGE>   7

                           (i) To include any prospectus required by Section
                           10(a)(3) of the Securities Act of 1933;

                           (ii) To reflect in the prospectus any facts or events
                           arising after the effective date of the registration
                           statement (or the most recent post-effective
                           amendment thereof) which, individually or in the
                           aggregate, represent a fundamental change in the
                           information set forth in the registration statement.
                           Notwithstanding the foregoing, any increase or
                           decrease in volume of securities offered (if the
                           total dollar value of securities offered would not
                           exceed that which was registered) and any deviation
                           from the low or high end of the estimated maximum
                           offering range may be reflected in the form of
                           prospectus filed with the Commission pursuant to Rule
                           424(b) if, in the aggregate, the changes in volume
                           and price represent no more than a 20% change in the
                           maximum aggregate offering price set forth in the
                           "Calculation of Registration Fee" table in the
                           effective registration statement;

                           (iii) To include any material information with
                           respect to the plan of distribution not previously
                           disclosed in the registration statement or any
                           material change to such information in the
                           registration statement;

                  (2) That, for the purpose of determining any liability under
                  the Securities Act of 1933, each such post-effective amendment
                  shall be deemed to be a new registration statement relating to
                  the securities offered therein, and the offering of such
                  securities at that time shall be deemed to be the initial bona
                  fide offering thereof;

                  (3) To remove from registration by means of a post-effective
                  amendment any of the securities being registered which remain
                  unsold at the termination of the offering.

         (b) The undersigned Registrant hereby undertakes that, for purposes of
         determining any liability under the Securities Act of 1933, each filing
         of the Registrant's annual report pursuant to Section 13(a) or Section
         15(d) of the Securities Exchange Act of 1934 (and, where applicable,
         each filing of an employee benefit plan's annual report pursuant to
         Section 15(d) of the Securities Exchange Act of 1934) that is
         incorporated by reference in the registration statement shall be deemed
         to be a new registration statement relating to the securities offered
         therein, and the offering of such securities at that time shall be
         deemed to be the initial bona fide offering thereof.

         (c) Insofar as indemnification for liabilities arising under the
         Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the Registrant pursuant to the foregoing
         provisions, or otherwise, the Registrant has been advised that in the
         opinion of the Securities and Exchange Commission such indemnification
         is against public policy as expressed in the Act and is, therefore,
         unenforceable. In the event that a claim for indemnification against
         such liabilities (other than the payment by the Registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         Registrant in the successful defense of any action, suit or proceeding)
         is asserted by such director, officer or controlling person in
         connection with the securities being registered, the Registrant will,
         unless in the opinion of its counsel the matter has been settled by
         controlling precedent, submit to a court of appropriate jurisdiction
         the question whether such indemnification by it is against public
         policy as expressed in the Act and will be governed by the final
         adjudication of such issue.


                                      -7-
<PAGE>   8


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the registrant certifies that it has reasonable grounds to believe that it meets
all the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the city of Concord, Commonwealth of Massachusetts on this
17th day of August 1999.


                                        ONESOURCE INFORMATION SERVICES, INC.

                                        By: /s/ Daniel J. Schimmel
                                           -------------------------------------
                                           Daniel J. Schimmel
                                           Chief Executive Officer and President


                        POWER OF ATTORNEY AND SIGNATURES

         We, the undersigned officers and directors of OneSource Information
Services, Inc., hereby severally constitute and appoint Daniel J. Schimmel and
Roy D. Landon, and each of them singly, our true and lawful attorneys, with full
power to them and each of them singly, to sign for us in our names in the
capacities indicated below, any registration statement on Form S-8, any and all
amendments and exhibits to this registration statement, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to the registration of the securities covered hereby or
thereby, and generally to do all things in our names and on our behalf in such
capacities to enable OneSource Information Services, Inc. to comply with the
provisions of the Securities Act of 1933 and all requirements of the Securities
and Exchange Commission.

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

<TABLE>
<CAPTION>

            SIGNATURE                                     TITLE(S)                                DATE
            ---------                                     --------                                ----
<S>                                      <C>                                                  <C>
/s/ Daniel J. Schimmel                   Chief Executive Officer, President and Director      August 17, 1999
------------------------------------     (Principal Executive Officer)
Daniel J. Schimmel

/s/ Roy D. Landon                        Vice President Finance & Chief Financial             August 17, 1999
------------------------------------     Officer (Principal Financial and Accounting
Roy D. Landon                            Officer)

/s/ David Dominik                        Director                                             August 17, 1999
------------------------------------
David Dominik

/s/ Martin Kahn                          Director                                             August 17, 1999
------------------------------------
Martin Kahn

/s/ Gregg S. Newmark                     Director                                             August 17, 1999
------------------------------------
Gregg S. Newmark
</TABLE>

                                      -8-

<PAGE>   9

                                  EXHIBIT INDEX
<TABLE>
<CAPTION>

EXHIBIT NO.       DESCRIPTION OF EXHIBIT
-----------       ----------------------
<S>               <C>
    4.1           Specimen Certificate for shares of the Company's Common Stock
                  (Incorporated by reference to Exhibit 4.01 to the S-1
                  Registration Statement).

    4.2           Description of Capital Stock (contained in the Second Amended
                  and Restated Certificate of Incorporation of the Company
                  (Incorporated by reference to Exhibit 3.01 to the S-1
                  Registration Statement)).

    4.3           1993 Stock Purchase and Option Plan (Incorporated by reference
                  to Exhibit 10.01 to the S-1 Registration Statement).

    4.4           1999 Stock Option and Incentive Plan (Incorporated by
                  reference to Exhibit 10.02 to the S-1 Registration Statement).

    4.5           1999 Employee Stock Purchase Plan (Incorporated by reference
                  to Exhibit 10.03 to the S-1 Registration Statement).

    5.1           Opinion of Testa, Hurwitz & Thibeault, LLP.

   23.1           Consent of PricewaterhouseCoopers LLP.

   23.2           Consent of Testa, Hurwitz & Thibeault, LLP (included in
                  Exhibit 5.1).

   24.1           Power of Attorney (found on signature page of this
                  registration statement).

</TABLE>

                                      -9-
[{"type": "S-8", "sequence": "1", "description": "ONE SOURCE INFORMATION SERVICES", "secsgml_size_bytes": 21398}]
{"company-data": {"conformed-name": "ONESOURCE INFORMATION SERVICES INC", "cik": "0001079880", "assigned-sic": "7374", "irs-number": "043204522", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-85363", "film-number": "99694268"}, "business-address": {"street1": "150 CAMBRIDGE PARK DRIVE", "city": "CAMBRIDGE", "state": "MA", "zip": "02140", "phone": "6174417000"}, "mail-address": {"street1": "150 CAMBRIDGE PARK DRIVE", "city": "CAMBRIDGE", "state": "MA", "zip": "02140"}}
1

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 17, 1999

                                                   REGISTRATION NO. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                      ONESOURCE INFORMATION SERVICES, INC.
             (Exact Name of Registrant as Specified in Its Charter)

          DELAWARE                                       04-3204522
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
 Incorporation or Organization)

                                300 BAKER AVENUE
                                CONCORD, MA 01742
               (Address of Principal Executive Offices) (Zip Code)

                              --------------------

                       1993 STOCK PURCHASE AND OPTION PLAN
                      1999 STOCK OPTION AND INCENTIVE PLAN
                        1999 EMPLOYEE STOCK PURCHASE PLAN
                            (Full Title of the Plan)

                              --------------------

                               DANIEL J. SCHIMMEL
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                      ONESOURCE INFORMATION SERVICES, INC.
                                300 BAKER AVENUE
                                CONCORD, MA 01742
                     (Name and Address of Agent For Service)

                                 (978) 318-4300
          (Telephone Number, Including Area Code, of Agent For Service)

                              --------------------
                                   Copies to:

                          LAWRENCE S. WITTENBERG, ESQ.
                         Testa, Hurwitz & Thibeault, LLP
                                 125 High Street
                           Boston, Massachusetts 02110
                                 (617) 248-7000

================================================================================
2

================================================================================

                         CALCULATION OF REGISTRATION FEE

================================================================================
PROPOSED
                                                            PROPOSED MAXIMUM          MAXIMUM
TITLE OF SECURITIES TO BE               AMOUNT TO BE         OFFERING PRICE          AGGREGATE            AMOUNT OF
       REGISTERED                      REGISTERED (1)         PER SHARE (3)        OFFERING PRICE      REGISTRATION FEE
-------------------------              --------------        ---------------        ---------------    ----------------
1993 STOCK PURCHASE AND OPTION PLAN

OneSource Information                 727,344 shares (2)         $0.12             $    87,281.28         $   24.26
Services, Inc. Common Stock,        1,359,994 shares (2)         $1.37             $ 1,863,191.80         $  517.97
$.01 par value                      1,444,649 shares (2)         $2.19             $ 3,163,781.30         $  879.53
                                       30,525 shares (2)         $5.90             $   180,097.50         $   50.07
                                      328,459 shares (2)         $9.97             $ 3,274,736.20         $  910.38

1999 STOCK OPTION AND INCENTIVE PLAN

OneSource Information                 800,000 shares             $6.5625 (4)       $ 5,250,000.00         $1,459.50
Services, Inc. Common Stock,
$.01 par value

1999 EMPLOYEE STOCK PURCHASE PLAN

OneSource Information                 100,000 shares             $6.5625 (4)       $   656,250.00         $  182.44
Services, Inc. Common Stock,
$.01 par value

TOTAL:                              4,790,971 shares                               $14,475,338.00         $4,024.15
                                                                                   ==============         =========
(1)      All share numbers are adjusted to reflect a 2.035 for 1 stock split
         effected by the Company on May 7, 1999.

(2)      Based on options to purchase 3,890,971 shares of the Company's Common
         Stock outstanding as of August 16, 1999 under the Company's 1993 Stock
         Purchase and Option Plan. All of such shares are issuable upon the
         exercise of outstanding options to purchase the number of shares at the
         exercise price listed above. Pursuant to Rule 457(h)(1), the aggregate
         offering price and the fee have been computed upon the basis of the
         price at which the options may be exercised.

(3)      Pursuant to Rule 457(h)(1), the aggregate offering price and the fee
         have been computed upon the basis of the price at which the options may
         be exercised.

                                      -2-
3

(4)      The price of $6.5625 per share, which is the average of the high and
         low prices of the Common Stock of the registrant reported on the Nasdaq
         National Market on August 11, 1999, is set forth solely for purposes of
         calculating the filing fee pursuant to Rules 457(c) and (h).

                                      -3-
4

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

ITEM 1.  PLAN INFORMATION.

         The documents containing the information specified in this Item 1 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Securities and
Exchange Commission (the "Commission") and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this
registration statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

ITEM 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

         The documents containing the information specified in this Item 2 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Commission and
the instructions to Form S-8, such documents are not being filed with the
Commission either as part of this registration statement or as prospectuses or
prospectus supplements pursuant to Rule 424.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed by OneSource Information Services, Inc.
(the "Company" or the "Registrant") with the Commission pursuant to the
Securities Act of 1933, as amended (the "Act"), or the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), as noted, are incorporated in this
registration statement by reference as of their respective dates:

         (a)      The Registrant's Prospectus, as contained within the
                  Registrant's Registration Statement on Form S-1, as amended,
                  (SEC File No. 333-73263) filed with the Commission pursuant to
                  the Act which contains audited financial statements for the
                  fiscal year ended December 31, 1998 and unaudited financial
                  statements for the three months ended March 31, 1999 (the "S-1
                  Registration Statement").

         (b)      The section entitled "Description of Registrant's Securities
                  to be Registered" contained in the Registrant's Registration
                  Statement on Form 8-A, as amended, filed with the Commission
                  pursuant to Section 12(g) of the Exchange Act on April 22,
                  1999.

         (c)      The Registrant's Quarterly Report on Form 10-Q as filed with
                  the Commission on August 13, 1999.

         All documents subsequently filed with the Commission by the Registrant
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the
filing of a post-effective amendment which indicates that all securities offered
herein have been sold or which deregisters all securities then remaining unsold,
shall be deemed to be incorporated by reference in this registration statement
and to be a part hereof from the date of filing of such documents.

                                      -4-
5

ITEM 4.  DESCRIPTION OF SECURITIES.

         Not applicable.

ITEM 5.  INTEREST OF NAMED EXPERTS AND COUNSEL.

         Not applicable.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Company's Second Amended and Restated Certificate of Incorporation
generally provides for indemnification of the Company's directors and officers
for liabilities and expenses that they may incur in such capacities, to the
extent allowed under the Delaware General Corporation Law. Reference is made to
the Company's Second Amended and Restated Certificate of Incorporation filed as
Exhibit 3.01 to the Company's S-1 Registration Statement.

                                      -5-
6

         The Underwriting Agreement dated as of May 18, 1999, by and among the
Company, the Underwriters listed on Schedule A thereto (the "UNDERWRITERS") and
the parties listed on Schedules B-1 and B-2 thereto (the "UNDERWRITING
AGREEMENT") provides that the Underwriters are obligated, under certain
circumstances, to indemnify the Company, its directors, its officers who signed
the S-1 Registration Statement and controlling persons of the Company against
certain liabilities, including liabilities under the Securities Act of 1933, as
amended (the "SECURITIES ACT"). Reference is made to the form of Underwriting
Agreement filed as Exhibit 1.01 to the Company's S-1 Registration Statement.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.

ITEM 8.  EXHIBITS.
EXHIBIT NO.       DESCRIPTION OF EXHIBIT
-----------       ----------------------
4.1        Specimen Certificate for shares of the Company's Common Stock
               (Incorporated by reference to Exhibit 4.01 to the S-1
               Registration Statement).

    4.2        Description of Capital Stock (contained in the Second Amended and
               Restated Certificate of Incorporation of the Company
               (Incorporated by reference to Exhibit 3.01 to the S-1
               Registration Statement)).

    4.3        1993 Stock Purchase and Option Plan (Incorporated by reference to
               Exhibit 10.01 to the S-1 Registration Statement).

    4.4        1999 Stock Option and Incentive Plan (Incorporated by reference
               to Exhibit 10.02 to the S-1 Registration Statement).

    4.5        1999 Employee Stock Purchase Plan (Incorporated by reference to
               Exhibit 10.03 to the S-1 Registration Statement).

    5.1        Opinion of Testa, Hurwitz & Thibeault, LLP.

   23.1        Consent of PricewaterhouseCoopers LLP.

   23.2        Consent of Testa, Hurwitz & Thibeault, LLP (included in
               Exhibit 5.1).

   24.1        Power of Attorney (found on the signature page of this
               registration statement).
ITEM 9.  UNDERTAKINGS.

         (a)      The undersigned Registrant hereby undertakes:

                  (1) To file, during any period in which offers or sales are
                  being made, a post-effective amendment to this registration
                  statement:

                                      -6-
7

                           (i) To include any prospectus required by Section
                           10(a)(3) of the Securities Act of 1933;

                           (ii) To reflect in the prospectus any facts or events
                           arising after the effective date of the registration
                           statement (or the most recent post-effective
                           amendment thereof) which, individually or in the
                           aggregate, represent a fundamental change in the
                           information set forth in the registration statement.
                           Notwithstanding the foregoing, any increase or
                           decrease in volume of securities offered (if the
                           total dollar value of securities offered would not
                           exceed that which was registered) and any deviation
                           from the low or high end of the estimated maximum
                           offering range may be reflected in the form of
                           prospectus filed with the Commission pursuant to Rule
                           424(b) if, in the aggregate, the changes in volume
                           and price represent no more than a 20% change in the
                           maximum aggregate offering price set forth in the
                           "Calculation of Registration Fee" table in the
                           effective registration statement;

                           (iii) To include any material information with
                           respect to the plan of distribution not previously
                           disclosed in the registration statement or any
                           material change to such information in the
                           registration statement;

                  (2) That, for the purpose of determining any liability under
                  the Securities Act of 1933, each such post-effective amendment
                  shall be deemed to be a new registration statement relating to
                  the securities offered therein, and the offering of such
                  securities at that time shall be deemed to be the initial bona
                  fide offering thereof;

                  (3) To remove from registration by means of a post-effective
                  amendment any of the securities being registered which remain
                  unsold at the termination of the offering.

         (b) The undersigned Registrant hereby undertakes that, for purposes of
         determining any liability under the Securities Act of 1933, each filing
         of the Registrant's annual report pursuant to Section 13(a) or Section
         15(d) of the Securities Exchange Act of 1934 (and, where applicable,
         each filing of an employee benefit plan's annual report pursuant to
         Section 15(d) of the Securities Exchange Act of 1934) that is
         incorporated by reference in the registration statement shall be deemed
         to be a new registration statement relating to the securities offered
         therein, and the offering of such securities at that time shall be
         deemed to be the initial bona fide offering thereof.

         (c) Insofar as indemnification for liabilities arising under the
         Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the Registrant pursuant to the foregoing
         provisions, or otherwise, the Registrant has been advised that in the
         opinion of the Securities and Exchange Commission such indemnification
         is against public policy as expressed in the Act and is, therefore,
         unenforceable. In the event that a claim for indemnification against
         such liabilities (other than the payment by the Registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         Registrant in the successful defense of any action, suit or proceeding)
         is asserted by such director, officer or controlling person in
         connection with the securities being registered, the Registrant will,
         unless in the opinion of its counsel the matter has been settled by
         controlling precedent, submit to a court of appropriate jurisdiction
         the question whether such indemnification by it is against public
         policy as expressed in the Act and will be governed by the final
         adjudication of such issue.

                                      -7-
8

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
the registrant certifies that it has reasonable grounds to believe that it meets
all the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the city of Concord, Commonwealth of Massachusetts on this
17th day of August 1999.

                                        ONESOURCE INFORMATION SERVICES, INC.

                                        By: /s/ Daniel J. Schimmel
                                           -------------------------------------
                                           Daniel J. Schimmel
                                           Chief Executive Officer and President

                        POWER OF ATTORNEY AND SIGNATURES

         We, the undersigned officers and directors of OneSource Information
Services, Inc., hereby severally constitute and appoint Daniel J. Schimmel and
Roy D. Landon, and each of them singly, our true and lawful attorneys, with full
power to them and each of them singly, to sign for us in our names in the
capacities indicated below, any registration statement on Form S-8, any and all
amendments and exhibits to this registration statement, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to the registration of the securities covered hereby or
thereby, and generally to do all things in our names and on our behalf in such
capacities to enable OneSource Information Services, Inc. to comply with the
provisions of the Securities Act of 1933 and all requirements of the Securities
and Exchange Commission.

         Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.
SIGNATURE                                     TITLE(S)                                DATE
            ---------                                     --------                                ----
/s/ Daniel J. Schimmel                   Chief Executive Officer, President and Director      August 17, 1999
------------------------------------     (Principal Executive Officer)
Daniel J. Schimmel

/s/ Roy D. Landon                        Vice President Finance & Chief Financial             August 17, 1999
------------------------------------     Officer (Principal Financial and Accounting
Roy D. Landon                            Officer)

/s/ David Dominik                        Director                                             August 17, 1999
------------------------------------
David Dominik

/s/ Martin Kahn                          Director                                             August 17, 1999
------------------------------------
Martin Kahn

/s/ Gregg S. Newmark                     Director                                             August 17, 1999
------------------------------------
Gregg S. Newmark
-8-
9

                                  EXHIBIT INDEX
EXHIBIT NO.       DESCRIPTION OF EXHIBIT
-----------       ----------------------
4.1           Specimen Certificate for shares of the Company's Common Stock
                  (Incorporated by reference to Exhibit 4.01 to the S-1
                  Registration Statement).

    4.2           Description of Capital Stock (contained in the Second Amended
                  and Restated Certificate of Incorporation of the Company
                  (Incorporated by reference to Exhibit 3.01 to the S-1
                  Registration Statement)).

    4.3           1993 Stock Purchase and Option Plan (Incorporated by reference
                  to Exhibit 10.01 to the S-1 Registration Statement).

    4.4           1999 Stock Option and Incentive Plan (Incorporated by
                  reference to Exhibit 10.02 to the S-1 Registration Statement).

    4.5           1999 Employee Stock Purchase Plan (Incorporated by reference
                  to Exhibit 10.03 to the S-1 Registration Statement).

    5.1           Opinion of Testa, Hurwitz & Thibeault, LLP.

   23.1           Consent of PricewaterhouseCoopers LLP.

   23.2           Consent of Testa, Hurwitz & Thibeault, LLP (included in
                  Exhibit 5.1).

   24.1           Power of Attorney (found on signature page of this
                  registration statement).
-9-