<PAGE>   1
     As filed with the Securities and Exchange Commission on March 10, 2000
                                                           Registration No. 333-

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                            BROADBASE SOFTWARE, INC.
           (Exact name of the Registrant as specified in its charter)


             DELAWARE                                      77-0408319
  (State or other jurisdiction of                       (I.R.S. employer
  incorporation or organization)                       identification no.)

                             172 CONSTITUTION DRIVE
                          MENLO PARK, CALIFORNIA 94025
                    (Address of principal executive offices)

         OPTIONS AND PURCHASE RIGHTS ISSUED UNDER THE RUBRIC, INC. 1997
          STOCK OPTION PLAN AND ASSUMED BY THE REGISTRANT IN CONNECTION
                         WITH ITS ACQUISITION OF RUBRIC.

               OPTIONS GRANTED PURSUANT TO STOCK OPTION AGREEMENTS
           ENTERED INTO OUTSIDE OF THE RUBRIC 1997 STOCK OPTION PLAN.

               BROADBASE SOFTWARE, INC. 1999 EQUITY INCENTIVE PLAN
           BROADBASE SOFTWARE, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN

               OPTIONS GRANTED PURSUANT TO STOCK OPTION AGREEMENTS
             ENTERED INTO OUTSIDE OF THE 1999 EQUITY INCENTIVE PLAN.
                           (Full titles of the plans)

                                  RUSTY THOMAS
              EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                             172 CONSTITUTION DRIVE
                          MENLO PARK, CALIFORNIA 94025
                                 (650) 614-8300
            (Name, address and telephone number of agent for service)

                                   Copies to:
                             DAVID K. MICHAELS, ESQ.
                              THOMAS J. HALL, ESQ.
                               FENWICK & WEST LLP
                              TWO PALO ALTO SQUARE
                           PALO ALTO, CALIFORNIA 94306


<PAGE>   2
                         CALCULATION OF REGISTRATION FEE


<TABLE>
<CAPTION>
===================================================================================================
                                                   PROPOSED          PROPOSED
                                   AMOUNT          MAXIMUM           MAXIMUM
       TITLE OF SHARES              TO BE         AGGREGATE         AGGREGATE        AMOUNT OF
       TO BE REGISTERED          REGISTERED    PRICE PER SHARE    OFFERING PRICE   REGISTRATION FEE
===================================================================================================
<S>                             <C>            <C>                <C>                <C>
Common Stock,
$0.001 par value per share        861,803 (1)       $ 22.92(2)     $ 19,748,642(3)   $ 5,214
===================================================================================================
Common Stock,
$0.001 par value per share      1,083,004 (4)       $123.69(3)     $133,954,057(5)   $35,364
===================================================================================================
TOTAL                                                                                $40,578
===================================================================================================
</TABLE>


(1)     Represents the aggregate of the following amounts, each as of March 9,
        2000:

        -       511,625 shares reserved for issuance pursuant to the exercise of
                options granted under the Rubric 1997 Stock Option Plan;

        -       50,178 shares reserved for issuance pursuant to the exercise of
                options granted outside of the Rubric 1997 Stock Option Plan;
                and

        -       300,000 shares reserved for issuance pursuant to the exercise of
                options granted outside of the 1999 Equity Incentive Plan.

(2)     Estimated weighted average per share exercise price for these
        outstanding options.

(3)     Calculated based on the weighted average per share exercise price,
        pursuant to Rule 457(h)(1) under the Securities Act of 1933, as amended
        (the "Securities Act").

(4)     Represents the aggregate of the following amounts, each as of March 9,
        2000:

        -       902,504 shares reserved for issuance pursuant to the exercise of
                options that may be granted under the 1999 Equity Incentive
                Plan; and

        -       180,500 shares reserved for issuance pursuant to the exercise of
                purchase rights that may be granted under the 1999 Employee
                Stock Purchase Plan.

(5)     Estimated solely for the purpose of calculating the registration fee in
        accordance with Rule 457(h)(1) and Rule 457(c) under the Securities Act,
        based on the average of the high and low prices of the Registrant's
        common stock as reported by the Nasdaq National Market on March 7,
        2000.


<PAGE>   3
           PART II: INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

        The following documents filed with the Securities and Exchange
Commission (the "Commission") are incorporated into this registration statement
by reference:

        (a)     our prospectus filed pursuant to Rule 424(b) under the
                Securities Act of 1933, as amended (the "Securities Act") in
                connection with our registration statement on Form S-1 (File No.
                333-95125), which contains audited balance data as of December
                31, 1998 and 1999 and audited financial statements for the years
                ended December 31, 1997, 1998 and 1999;

        (b)     all reports filed pursuant to Section 13(a) or 15(d) of the
                Securities Exchange Act of 1934, as amended (the "Exchange Act")
                since the end of the fiscal year covered by the document
                referred to in (a) above; and

        (c)     the description of our common stock contained in our
                registration statement on Form 8-A filed under Section 12(g) of
                the Exchange Act, including any amendment or report filed for
                the purpose of updating such description.

        All documents subsequently filed by us 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 registered hereby have been sold
or which deregisters all securities then remaining unsold, shall be deemed to be
incorporated by reference herein and to be a part hereof from the date of the
filing of such documents.

ITEM 4. DESCRIPTION OF SECURITIES.

        Not applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

        Investment partnerships comprised of certain partners of Fenwick & West
LLP, our counsel, own 32,379 shares of our common stock.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Section 145 of the Delaware General Corporation Law authorizes a court
to award, or a corporation's board of directors to grant, indemnity to directors
and executive officers in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities, including
reimbursement for expenses incurred arising under the Securities Act.

        As permitted by the Delaware General Corporation Law, our certificate of
incorporation, as amended, includes a provision that eliminates the personal
liability of its directors for monetary damages for breach of fiduciary duty as
a director, except for liability:

        -       for any breach of the director's duty of loyalty to us or our
                stockholders;

        -       for acts or omissions not in good faith or that involve
                intentional misconduct or a knowing violation of law;

        -       under Section 174 of the Delaware General Corporation Law
                (regarding unlawful dividends and stock purchases); or

        -       for any transaction from which the director derived an improper
                personal benefit.


                                      II-1


<PAGE>   4
        As permitted by the Delaware General Corporation Law, our bylaws provide
that:

        -       we are required to indemnify our directors and executive
                officers to the fullest extent permitted by the Delaware General
                Corporation Law, subject to limited exceptions;

        -       we may indemnify our other employees and agents as set forth in
                the Delaware General Corporation Law;

        -       we are required to advance expenses, as incurred, to our
                directors and officers in connection with a legal proceeding to
                the fullest extent permitted by the Delaware General Corporation
                Law, subject to limited exceptions; and

        -       the rights conferred in the bylaws are not exclusive.

        We entered into indemnity agreements with each of our current directors
and executive officers to give such directors and executive officers additional
contractual assurances regarding the scope of the indemnification set forth in
our certificate of incorporation and to provide additional procedural
protections. The indemnification provisions in our certificate of incorporation,
bylaws and the indemnity agreements may be sufficiently broad to permit
indemnification of our directors and executive officers for liabilities arising
under the Securities Act.

        We entered into underwriting agreements with investment banks and
certain of our stockholders in connection with our initial public offering and
secondary public offering pursuant to which the underwriters agreed to indemnify
us, our directors and executive officers against certain liabilities, including
liabilities arising under the Securities Act. Likewise, pursuant to our Fourth
Amended and Restated Investors' Rights Agreement, stockholders exercising rights
pursuant to this agreement have agreed to indemnify us, our directors and our
officers who sign the registration statement against certain liabilities
including liabilities arising under the Securities Act.

        We have also obtained directors' and officers' liability insurance that
will include coverage for securities matters. At present, there is no pending
litigation or proceeding involving any of our directors, officers or employees
regarding which indemnification is sought, nor are we aware of any threatened
litigation that may result in claims for indemnification.

        See also the undertakings set out in response to Item 9.

        Reference is made to the following documents regarding relevant
indemnification provisions described above and elsewhere herein:


        Certificate of Incorporation (see Exhibit 4.01).

        Bylaws (see Exhibit 4.02).

        Form of Indemnity Agreement (incorporated by reference to Exhibit 10.01
        to our registration statement on Form S-1 (File No. 333-82251) filed
        with the Commission on July 2, 1999, as subsequently amended).



ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

        Not applicable.


                                      II-2


<PAGE>   5
ITEM 8. EXHIBITS.


<TABLE>
<CAPTION>
EXHIBIT                                          EXHIBIT
NUMBER                                            TITLE
-------                                           -----
<S>         <C>
4.01        Certificate of Incorporation, filed with the Delaware Secretary of
            State on June 28, 1999 (incorporated by reference to Exhibit 3.01 to
            our registration statement on Form S-1 (File No. 333-82251) filed
            with the Commission on July 2, 1999, as subsequently amended).

4.02        Certificate of Amendment of Certificate of Incorporation, filed with
            the Delaware Secretary of State on July 30, 1999 (incorporated by
            reference to Exhibit 3.04 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.03        Certificate of Designation, filed with the Delaware Secretary of
            State on September 10, 1999 (incorporated by reference to Exhibit
            3.03 to our registration statement on Form S-1 (File No. 333-82251)
            filed with the Commission on July 2, 1999, as subsequently amended).

4.04        Certificate of Retirement, filed with the Delaware Secretary of
            State on November 3, 1999 (incorporated by reference to Exhibit 3.05
            to our registration statement on Form S-1 (File No. 333-95125) filed
            with the Commission on January 21, 2000, as subsequently amended).

4.05        Bylaws, as adopted on June 28, 1999 (incorporated by reference to
            Exhibit 3.02 to our registration statement on Form S-1 (File No.
            333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.06        Form of specimen certificate for our common stock (incorporated by
            reference to Exhibit 4.01 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.07        Fourth Amended and Restated Investors' Rights Agreement, dated June
            30, 1999 (incorporated by reference to Exhibit 4.02 to our
            registration statement on Form S-1 (File No. 333-82251) filed with
            the Commission on July 2, 1999, as subsequently amended).

4.08        Series E Rights Agreement, dated June 30, 1999 (incorporated by
            reference to Exhibit 4.03 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.09        Broadbase Software, Inc. 1999 Equity Incentive Plan and related
            forms of agreements (incorporated by reference to Exhibit 10.03 to
            our registration statement on Form S-1 (File No. 333-82251) filed
            with the Commission on July 2, 1999, as subsequently amended).

4.10        Broadbase Software, Inc. 1999 Employee Stock Purchase Plan and
            related forms of agreements (incorporated by reference to Exhibit
            10.04 to our registration statement on Form S-1 (File No. 333-82251)
            filed with the Commission on July 2, 1999, as subsequently amended).

4.11        Rubric, Inc. 1997 Stock Option Plan (incorporated by reference to
            Exhibit 10.15 to our registration statement on Form S-1 (File No.
            333-95125) filed with the Commission on January 21, 2000, as
            subsequently amended).

4.12        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Greg Martin dated January 4, 2000.

4.13        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Rusty Thomas dated January 4, 2000.
</TABLE>


                                      II-3


<PAGE>   6
<TABLE>
<S>         <C>
4.14        Rubric, Inc. Stock Option Agreement between Rubric and Paul
            Salsgiver, dated December 8, 1999.

5.01        Opinion of Fenwick & West LLP regarding the legality of the
            securities being registered.

23.01       Consent of Fenwick & West LLP (included in Exhibit 5.01).

23.02       Consent of Ernst & Young LLP, Independent Auditors.

23.03       Consent of PricewaterhouseCoopers LLP, Independent Accountants.

24.01       Power of Attorney (see signature page following Item 9).
</TABLE>


ITEM 9. UNDERTAKINGS.

We hereby undertake:

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

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

        (b) 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; and

        (c) 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;

        provided, however, that (a) and (b) do not apply if the information
        required to be included in a post-effective amendment by (a) and (b) is
        contained in periodic reports filed with or furnished to the Commission
        by us pursuant to Section 13 or Section 15(d) of the Exchange Act that
        are incorporated by reference in the registration statement.

    (2) That, for the purpose of determining any liability under the Securities
        Act, 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.

    (4) That, for purposes of determining any liability under the Securities
        Act, each filing of our annual report pursuant to Section 13(a) or
        Section 15(d) of the Exchange Act that is incorporated by reference in
        the registration statement shall be deemed to be a new registration
        statement relating to the securities offered in the registration
        statement, and the offering of the securities at that time shall be
        deemed to be the initial bona fide offering of those securities.

        Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to our directors, officers and controlling persons pursuant
to the foregoing provisions, or otherwise, we have been advised that in the
opinion of the Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by us of expenses incurred or paid by one or more of our directors,
officers or controlling persons 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, we will, unless in the opinion
of our 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 Securities Act and will be
governed by the final adjudication of such issue.


                                      II-4


<PAGE>   7
                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of 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 Menlo Park, state of California, on this 10th day of
March, 2000.

                                 BROADBASE SOFTWARE, INC.


                                 By: /s/ CHUCK BAY
                                    -------------------------------------
                                    Chuck Bay
                                    Chief Executive Officer and President


                                POWER OF ATTORNEY

        KNOW ALL PERSONS BY THESE PRESENTS that each individual whose signature
appears below and on the next page constitutes and appoints Chuck Bay, Rusty
Thomas and Eric Willgohs, and each of them, his true and lawful
attorneys-in-fact and agents with full power of substitution, for him and in his
name, place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this registration statement on Form
S-8, and to file the same with all exhibits thereto and all documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or his or their substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

        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                             DATE
---------                             -----                             ----
<S>                                   <C>                               <C>
PRINCIPAL EXECUTIVE OFFICER:

/s/ CHUCK BAY                         President, Chief Executive
-------------------------------       Officer and Director              March 10, 2000
Chuck Bay

PRINCIPAL FINANCIAL OFFICER AND
PRINCIPAL ACCOUNTING OFFICER:

/s/ RUSTY THOMAS                      Senior Vice President and
-------------------------------       Chief Financial Officer           March 10, 2000
Rusty Thomas
</TABLE>


                                      II-5


<PAGE>   8
<TABLE>
<S>                                   <C>                               <C>
ADDITIONAL DIRECTORS:


/s/ MARK KREMER                       Chairman of the Board of          March 10, 2000
-------------------------------       Directors
Mark Kremer


/s/ KEVIN HARVEY                      Director                          March 10, 2000
-------------------------------
Kevin Harvey


/s/ PAUL LEVY                         Director                          March 10, 2000
-------------------------------
Paul Levy


                                      Director
-------------------------------
Nancy Schoendorf
</TABLE>


                                      II-6


<PAGE>   9
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT                                          EXHIBIT
NUMBER                                            TITLE
------                                            -----
<S>         <C>
4.12        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Greg Martin dated January 4, 2000.

4.13        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Rusty Thomas dated January 4, 2000.

4.14        Rubric, Inc. Stock Option Agreement between Rubric and Paul
            Salsgiver, dated December 8, 1999.

5.01        Opinion of Fenwick & West LLP regarding the legality of the
            securities being registered.

23.01       Consent of Fenwick & West LLP (included in Exhibit 5.01).

23.02       Consent of Ernst & Young LLP, Independent Auditors.

23.03       Consent of PricewaterhouseCoopers LLP, Independent Accountants.

24.01       Power of Attorney (see signature page following Item 9).
</TABLE>
[{"type": "S-8", "sequence": "1", "description": "FORM S-8", "secsgml_size_bytes": 24143}]
{"company-data": {"conformed-name": "BROADBASE SOFTWARE INC", "cik": "0001076016", "assigned-sic": "7389", "irs-number": "770417081", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-32120", "film-number": "565898"}, "business-address": {"street1": "172 CONSTITUTION DR", "city": "MENLO PARK", "state": "CA", "zip": "94025"}, "mail-address": {"street1": "172 CONSTITUTION DRIVE", "city": "MENLO PARK", "state": "CA", "zip": "94025"}, "former-company": {"former-conformed-name": "BROADBASE INFORMATION SYSTEMS INC", "date-changed": "19990624"}}
1
     As filed with the Securities and Exchange Commission on March 10, 2000
                                                           Registration No. 333-

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                            BROADBASE SOFTWARE, INC.
           (Exact name of the Registrant as specified in its charter)

             DELAWARE                                      77-0408319
  (State or other jurisdiction of                       (I.R.S. employer
  incorporation or organization)                       identification no.)

                             172 CONSTITUTION DRIVE
                          MENLO PARK, CALIFORNIA 94025
                    (Address of principal executive offices)

         OPTIONS AND PURCHASE RIGHTS ISSUED UNDER THE RUBRIC, INC. 1997
          STOCK OPTION PLAN AND ASSUMED BY THE REGISTRANT IN CONNECTION
                         WITH ITS ACQUISITION OF RUBRIC.

               OPTIONS GRANTED PURSUANT TO STOCK OPTION AGREEMENTS
           ENTERED INTO OUTSIDE OF THE RUBRIC 1997 STOCK OPTION PLAN.

               BROADBASE SOFTWARE, INC. 1999 EQUITY INCENTIVE PLAN
           BROADBASE SOFTWARE, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN

               OPTIONS GRANTED PURSUANT TO STOCK OPTION AGREEMENTS
             ENTERED INTO OUTSIDE OF THE 1999 EQUITY INCENTIVE PLAN.
                           (Full titles of the plans)

                                  RUSTY THOMAS
              EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                             172 CONSTITUTION DRIVE
                          MENLO PARK, CALIFORNIA 94025
                                 (650) 614-8300
            (Name, address and telephone number of agent for service)

                                   Copies to:
                             DAVID K. MICHAELS, ESQ.
                              THOMAS J. HALL, ESQ.
                               FENWICK & WEST LLP
                              TWO PALO ALTO SQUARE
                           PALO ALTO, CALIFORNIA 94306
2
                         CALCULATION OF REGISTRATION FEE
===================================================================================================
                                                   PROPOSED          PROPOSED
                                   AMOUNT          MAXIMUM           MAXIMUM
       TITLE OF SHARES              TO BE         AGGREGATE         AGGREGATE        AMOUNT OF
       TO BE REGISTERED          REGISTERED    PRICE PER SHARE    OFFERING PRICE   REGISTRATION FEE
===================================================================================================
Common Stock,
$0.001 par value per share        861,803 (1)       $ 22.92(2)     $ 19,748,642(3)   $ 5,214
===================================================================================================
Common Stock,
$0.001 par value per share      1,083,004 (4)       $123.69(3)     $133,954,057(5)   $35,364
===================================================================================================
TOTAL                                                                                $40,578
===================================================================================================
(1)     Represents the aggregate of the following amounts, each as of March 9,
        2000:

        -       511,625 shares reserved for issuance pursuant to the exercise of
                options granted under the Rubric 1997 Stock Option Plan;

        -       50,178 shares reserved for issuance pursuant to the exercise of
                options granted outside of the Rubric 1997 Stock Option Plan;
                and

        -       300,000 shares reserved for issuance pursuant to the exercise of
                options granted outside of the 1999 Equity Incentive Plan.

(2)     Estimated weighted average per share exercise price for these
        outstanding options.

(3)     Calculated based on the weighted average per share exercise price,
        pursuant to Rule 457(h)(1) under the Securities Act of 1933, as amended
        (the "Securities Act").

(4)     Represents the aggregate of the following amounts, each as of March 9,
        2000:

        -       902,504 shares reserved for issuance pursuant to the exercise of
                options that may be granted under the 1999 Equity Incentive
                Plan; and

        -       180,500 shares reserved for issuance pursuant to the exercise of
                purchase rights that may be granted under the 1999 Employee
                Stock Purchase Plan.

(5)     Estimated solely for the purpose of calculating the registration fee in
        accordance with Rule 457(h)(1) and Rule 457(c) under the Securities Act,
        based on the average of the high and low prices of the Registrant's
        common stock as reported by the Nasdaq National Market on March 7,
        2000.
3
           PART II: INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

        The following documents filed with the Securities and Exchange
Commission (the "Commission") are incorporated into this registration statement
by reference:

        (a)     our prospectus filed pursuant to Rule 424(b) under the
                Securities Act of 1933, as amended (the "Securities Act") in
                connection with our registration statement on Form S-1 (File No.
                333-95125), which contains audited balance data as of December
                31, 1998 and 1999 and audited financial statements for the years
                ended December 31, 1997, 1998 and 1999;

        (b)     all reports filed pursuant to Section 13(a) or 15(d) of the
                Securities Exchange Act of 1934, as amended (the "Exchange Act")
                since the end of the fiscal year covered by the document
                referred to in (a) above; and

        (c)     the description of our common stock contained in our
                registration statement on Form 8-A filed under Section 12(g) of
                the Exchange Act, including any amendment or report filed for
                the purpose of updating such description.

        All documents subsequently filed by us 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 registered hereby have been sold
or which deregisters all securities then remaining unsold, shall be deemed to be
incorporated by reference herein and to be a part hereof from the date of the
filing of such documents.

ITEM 4. DESCRIPTION OF SECURITIES.

        Not applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

        Investment partnerships comprised of certain partners of Fenwick & West
LLP, our counsel, own 32,379 shares of our common stock.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Section 145 of the Delaware General Corporation Law authorizes a court
to award, or a corporation's board of directors to grant, indemnity to directors
and executive officers in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities, including
reimbursement for expenses incurred arising under the Securities Act.

        As permitted by the Delaware General Corporation Law, our certificate of
incorporation, as amended, includes a provision that eliminates the personal
liability of its directors for monetary damages for breach of fiduciary duty as
a director, except for liability:

        -       for any breach of the director's duty of loyalty to us or our
                stockholders;

        -       for acts or omissions not in good faith or that involve
                intentional misconduct or a knowing violation of law;

        -       under Section 174 of the Delaware General Corporation Law
                (regarding unlawful dividends and stock purchases); or

        -       for any transaction from which the director derived an improper
                personal benefit.

                                      II-1
4
        As permitted by the Delaware General Corporation Law, our bylaws provide
that:

        -       we are required to indemnify our directors and executive
                officers to the fullest extent permitted by the Delaware General
                Corporation Law, subject to limited exceptions;

        -       we may indemnify our other employees and agents as set forth in
                the Delaware General Corporation Law;

        -       we are required to advance expenses, as incurred, to our
                directors and officers in connection with a legal proceeding to
                the fullest extent permitted by the Delaware General Corporation
                Law, subject to limited exceptions; and

        -       the rights conferred in the bylaws are not exclusive.

        We entered into indemnity agreements with each of our current directors
and executive officers to give such directors and executive officers additional
contractual assurances regarding the scope of the indemnification set forth in
our certificate of incorporation and to provide additional procedural
protections. The indemnification provisions in our certificate of incorporation,
bylaws and the indemnity agreements may be sufficiently broad to permit
indemnification of our directors and executive officers for liabilities arising
under the Securities Act.

        We entered into underwriting agreements with investment banks and
certain of our stockholders in connection with our initial public offering and
secondary public offering pursuant to which the underwriters agreed to indemnify
us, our directors and executive officers against certain liabilities, including
liabilities arising under the Securities Act. Likewise, pursuant to our Fourth
Amended and Restated Investors' Rights Agreement, stockholders exercising rights
pursuant to this agreement have agreed to indemnify us, our directors and our
officers who sign the registration statement against certain liabilities
including liabilities arising under the Securities Act.

        We have also obtained directors' and officers' liability insurance that
will include coverage for securities matters. At present, there is no pending
litigation or proceeding involving any of our directors, officers or employees
regarding which indemnification is sought, nor are we aware of any threatened
litigation that may result in claims for indemnification.

        See also the undertakings set out in response to Item 9.

        Reference is made to the following documents regarding relevant
indemnification provisions described above and elsewhere herein:

        Certificate of Incorporation (see Exhibit 4.01).

        Bylaws (see Exhibit 4.02).

        Form of Indemnity Agreement (incorporated by reference to Exhibit 10.01
        to our registration statement on Form S-1 (File No. 333-82251) filed
        with the Commission on July 2, 1999, as subsequently amended).

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

        Not applicable.

                                      II-2
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ITEM 8. EXHIBITS.
EXHIBIT                                          EXHIBIT
NUMBER                                            TITLE
-------                                           -----
4.01        Certificate of Incorporation, filed with the Delaware Secretary of
            State on June 28, 1999 (incorporated by reference to Exhibit 3.01 to
            our registration statement on Form S-1 (File No. 333-82251) filed
            with the Commission on July 2, 1999, as subsequently amended).

4.02        Certificate of Amendment of Certificate of Incorporation, filed with
            the Delaware Secretary of State on July 30, 1999 (incorporated by
            reference to Exhibit 3.04 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.03        Certificate of Designation, filed with the Delaware Secretary of
            State on September 10, 1999 (incorporated by reference to Exhibit
            3.03 to our registration statement on Form S-1 (File No. 333-82251)
            filed with the Commission on July 2, 1999, as subsequently amended).

4.04        Certificate of Retirement, filed with the Delaware Secretary of
            State on November 3, 1999 (incorporated by reference to Exhibit 3.05
            to our registration statement on Form S-1 (File No. 333-95125) filed
            with the Commission on January 21, 2000, as subsequently amended).

4.05        Bylaws, as adopted on June 28, 1999 (incorporated by reference to
            Exhibit 3.02 to our registration statement on Form S-1 (File No.
            333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.06        Form of specimen certificate for our common stock (incorporated by
            reference to Exhibit 4.01 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.07        Fourth Amended and Restated Investors' Rights Agreement, dated June
            30, 1999 (incorporated by reference to Exhibit 4.02 to our
            registration statement on Form S-1 (File No. 333-82251) filed with
            the Commission on July 2, 1999, as subsequently amended).

4.08        Series E Rights Agreement, dated June 30, 1999 (incorporated by
            reference to Exhibit 4.03 to our registration statement on Form S-1
            (File No. 333-82251) filed with the Commission on July 2, 1999, as
            subsequently amended).

4.09        Broadbase Software, Inc. 1999 Equity Incentive Plan and related
            forms of agreements (incorporated by reference to Exhibit 10.03 to
            our registration statement on Form S-1 (File No. 333-82251) filed
            with the Commission on July 2, 1999, as subsequently amended).

4.10        Broadbase Software, Inc. 1999 Employee Stock Purchase Plan and
            related forms of agreements (incorporated by reference to Exhibit
            10.04 to our registration statement on Form S-1 (File No. 333-82251)
            filed with the Commission on July 2, 1999, as subsequently amended).

4.11        Rubric, Inc. 1997 Stock Option Plan (incorporated by reference to
            Exhibit 10.15 to our registration statement on Form S-1 (File No.
            333-95125) filed with the Commission on January 21, 2000, as
            subsequently amended).

4.12        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Greg Martin dated January 4, 2000.

4.13        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Rusty Thomas dated January 4, 2000.
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4.14        Rubric, Inc. Stock Option Agreement between Rubric and Paul
            Salsgiver, dated December 8, 1999.

5.01        Opinion of Fenwick & West LLP regarding the legality of the
            securities being registered.

23.01       Consent of Fenwick & West LLP (included in Exhibit 5.01).

23.02       Consent of Ernst & Young LLP, Independent Auditors.

23.03       Consent of PricewaterhouseCoopers LLP, Independent Accountants.

24.01       Power of Attorney (see signature page following Item 9).
ITEM 9. UNDERTAKINGS.

We hereby undertake:

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

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

        (b) 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; and

        (c) 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;

        provided, however, that (a) and (b) do not apply if the information
        required to be included in a post-effective amendment by (a) and (b) is
        contained in periodic reports filed with or furnished to the Commission
        by us pursuant to Section 13 or Section 15(d) of the Exchange Act that
        are incorporated by reference in the registration statement.

    (2) That, for the purpose of determining any liability under the Securities
        Act, 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.

    (4) That, for purposes of determining any liability under the Securities
        Act, each filing of our annual report pursuant to Section 13(a) or
        Section 15(d) of the Exchange Act that is incorporated by reference in
        the registration statement shall be deemed to be a new registration
        statement relating to the securities offered in the registration
        statement, and the offering of the securities at that time shall be
        deemed to be the initial bona fide offering of those securities.

        Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to our directors, officers and controlling persons pursuant
to the foregoing provisions, or otherwise, we have been advised that in the
opinion of the Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by us of expenses incurred or paid by one or more of our directors,
officers or controlling persons 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, we will, unless in the opinion
of our 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 Securities Act and will be
governed by the final adjudication of such issue.

                                      II-4
7
                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of 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 Menlo Park, state of California, on this 10th day of
March, 2000.

                                 BROADBASE SOFTWARE, INC.

                                 By: /s/ CHUCK BAY
                                    -------------------------------------
                                    Chuck Bay
                                    Chief Executive Officer and President

                                POWER OF ATTORNEY

        KNOW ALL PERSONS BY THESE PRESENTS that each individual whose signature
appears below and on the next page constitutes and appoints Chuck Bay, Rusty
Thomas and Eric Willgohs, and each of them, his true and lawful
attorneys-in-fact and agents with full power of substitution, for him and in his
name, place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this registration statement on Form
S-8, and to file the same with all exhibits thereto and all documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or his or their substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

        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                             DATE
---------                             -----                             ----
PRINCIPAL EXECUTIVE OFFICER:

/s/ CHUCK BAY                         President, Chief Executive
-------------------------------       Officer and Director              March 10, 2000
Chuck Bay

PRINCIPAL FINANCIAL OFFICER AND
PRINCIPAL ACCOUNTING OFFICER:

/s/ RUSTY THOMAS                      Senior Vice President and
-------------------------------       Chief Financial Officer           March 10, 2000
Rusty Thomas
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ADDITIONAL DIRECTORS:

/s/ MARK KREMER                       Chairman of the Board of          March 10, 2000
-------------------------------       Directors
Mark Kremer

/s/ KEVIN HARVEY                      Director                          March 10, 2000
-------------------------------
Kevin Harvey

/s/ PAUL LEVY                         Director                          March 10, 2000
-------------------------------
Paul Levy

                                      Director
-------------------------------
Nancy Schoendorf
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                                  EXHIBIT INDEX
EXHIBIT                                          EXHIBIT
NUMBER                                            TITLE
------                                            -----
4.12        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Greg Martin dated January 4, 2000.

4.13        Broadbase Software, Inc. Non-Plan Stock Option Agreement between us
            and Rusty Thomas dated January 4, 2000.

4.14        Rubric, Inc. Stock Option Agreement between Rubric and Paul
            Salsgiver, dated December 8, 1999.

5.01        Opinion of Fenwick & West LLP regarding the legality of the
            securities being registered.

23.01       Consent of Fenwick & West LLP (included in Exhibit 5.01).

23.02       Consent of Ernst & Young LLP, Independent Auditors.

23.03       Consent of PricewaterhouseCoopers LLP, Independent Accountants.

24.01       Power of Attorney (see signature page following Item 9).