content: <PAGE>
  
                        SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549
  
                                     FORM 8-K
  
                                  CURRENT REPORT
  
      Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
  
  Date of Report (Date of earliest event reported): November 4, 1999
                                                    ------------------------------
  
                                TIBCO SOFTWARE INC.
  --------------------------------------------------------------------------------
              (Exact name of registrant as specified in its charter)
  
  Delaware                           000-26579                   77-0449727
  --------------------------------------------------------------------------------
  (State or other                   (Commission                (IRS Employer
  jurisdiction of                   File Number)           Identification Number)
   incorporation)
  
         3165 Porter Drive, Palo Alto, CA                           94304
  --------------------------------------------------------------------------------
     (Address of principal executive offices)                     (Zip Code)
  
  Registrant's telephone number, including area code: (650) 846-5000
                                                      ----------------------------
  
  ________________________________________________________________________________
           (Former name or former address, if changed since last report)
  <PAGE>
  
  ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS.
            ------------------------------------
  
       On November 4, 1999 (the "Closing Date"), pursuant to three separate
  agreements, each an Asset Purchase Agreement dated as of September 30, 1999
  (together, the "Agreements") by and among TIBCO Software Inc., a Delaware
  corporation ("TIBCO"), InConcert, Inc., a Delaware corporation ("InConcert"),
  and Xerox Corporation, a New York corporation ("Xerox"), TIBCO acquired
  substantially all of the assets of InConcert, a subsidiary of Xerox, for $34
  million in cash. TIBCO is a leading provider of real-time infrastructure
  software for the internet and enterprise that enables businesses to dynamically
  link internal operations, business partners and customer channels. InConcert is
  a developer of business integration solutions for telecommunications companies.
  TIBCO intends to utilize the assets acquired through the purchase, including any
  physical assets so acquired, in its ongoing business.
  
       The consideration paid by TIBCO for the assets of InConcert acquired under
  the Agreements was determined pursuant to arms length negotiations and took into
  account various factors concerning the valuation of the business of InConcert.
  A portion of TIBCO's working capital was used for the purchase of the assets of
  InConcert.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            ---------------------------------
  
       (a)  Financial Statements of InConcert, Inc.
            ---------------------------------------
  
            The Financial Information required to be filed pursuant to Item 7(a)
  of Form 8-K was not available at the time of filing of this Current Report on
  Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but in no
  event later than 60 days after the date this Form 8-K is required to be filed.
  
       (b)  Pro Forma Financial Information
            -------------------------------
  
            The Pro Forma Financial Information required to be filed pursuant to
  Item 7(b) of Form 8-K was not available at the time of filing of this Current
  Report on Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but
  in no event later than 60 days after the date this Form 8-K is required to be
  filed.
  
       (c)  Exhibits
            --------
  
            2.1  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.S. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.1).
  
            2.2  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.K. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.2).
  
            2.3  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the German Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.3).
  
                                        -2-
  <PAGE>
  
                                    SIGNATURES
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this Report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
  Dated: November 18, 1999                TIBCO SOFTWARE INC.
  
                                          /s/ Paul G. Hansen
                                          ------------------
                                          Paul G. Hansen
                                          Executive Vice President, Finance
                                          and Chief Financial Officer
                                          (Principal Financial and Accounting
                                          Officer)
  
                                        -3-
  <PAGE>
  
                                 INDEX TO EXHIBITS
                                 -----------------
  
  Exhibit
  Number                             Description of Document
  ------                             -----------------------
  
  2.1            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.S. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.1).
  
  2.2            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.K. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.2).
  
  2.3            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the German Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.3).
  
                                        -4-
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text: SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549
  
                                     FORM 8-K
  
                                  CURRENT REPORT
  
      Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
  
  Date of Report (Date of earliest event reported): November 4, 1999
                                                    ------------------------------
  
                                TIBCO SOFTWARE INC.
  --------------------------------------------------------------------------------
              (Exact name of registrant as specified in its charter)
  
  Delaware                           000-26579                   77-0449727
  --------------------------------------------------------------------------------
  (State or other                   (Commission                (IRS Employer
  jurisdiction of                   File Number)           Identification Number)
   incorporation)
  
         3165 Porter Drive, Palo Alto, CA                           94304
  --------------------------------------------------------------------------------
     (Address of principal executive offices)                     (Zip Code)
  
  Registrant's telephone number, including area code: (650) 846-5000
                                                      ----------------------------
  
  ________________________________________________________________________________
           (Former name or former address, if changed since last report)
  ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS.
            ------------------------------------
  
       On November 4, 1999 (the "Closing Date"), pursuant to three separate
  agreements, each an Asset Purchase Agreement dated as of September 30, 1999
  (together, the "Agreements") by and among TIBCO Software Inc., a Delaware
  corporation ("TIBCO"), InConcert, Inc., a Delaware corporation ("InConcert"),
  and Xerox Corporation, a New York corporation ("Xerox"), TIBCO acquired
  substantially all of the assets of InConcert, a subsidiary of Xerox, for $34
  million in cash. TIBCO is a leading provider of real-time infrastructure
  software for the internet and enterprise that enables businesses to dynamically
  link internal operations, business partners and customer channels. InConcert is
  a developer of business integration solutions for telecommunications companies.
  TIBCO intends to utilize the assets acquired through the purchase, including any
  physical assets so acquired, in its ongoing business.
  
       The consideration paid by TIBCO for the assets of InConcert acquired under
  the Agreements was determined pursuant to arms length negotiations and took into
  account various factors concerning the valuation of the business of InConcert.
  A portion of TIBCO's working capital was used for the purchase of the assets of
  InConcert.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            ---------------------------------
  
       (a)  Financial Statements of InConcert, Inc.
            ---------------------------------------
  
            The Financial Information required to be filed pursuant to Item 7(a)
  of Form 8-K was not available at the time of filing of this Current Report on
  Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but in no
  event later than 60 days after the date this Form 8-K is required to be filed.
  
       (b)  Pro Forma Financial Information
            -------------------------------
  
            The Pro Forma Financial Information required to be filed pursuant to
  Item 7(b) of Form 8-K was not available at the time of filing of this Current
  Report on Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but
  in no event later than 60 days after the date this Form 8-K is required to be
  filed.
  
       (c)  Exhibits
            --------
  
            2.1  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.S. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.1).
  
            2.2  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.K. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.2).
  
            2.3  Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the German Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.3).
  
                                        -2-
  SIGNATURES
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this Report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
  Dated: November 18, 1999                TIBCO SOFTWARE INC.
  
                                          /s/ Paul G. Hansen
                                          ------------------
                                          Paul G. Hansen
                                          Executive Vice President, Finance
                                          and Chief Financial Officer
                                          (Principal Financial and Accounting
                                          Officer)
  
                                        -3-
  INDEX TO EXHIBITS
                                 -----------------
  
  Exhibit
  Number                             Description of Document
  ------                             -----------------------
  
  2.1            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.S. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.1).
  
  2.2            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the U.K. Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.2).
  
  2.3            Asset Purchase Agreement, dated as of September 30, 1999, among
                 TIBCO Software Inc., InConcert, Inc., and Xerox Corporation
                 providing for the transfer of the German Assets (as defined
                 therein) of InConcert (the schedules to such agreement are not
                 filed herewith and are listed on the last page of Exhibit 2.3).
  
                                        -4-