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): December 17, 1998
  
  
                                Greater Bay Bancorp
               (Exact name of registrant as specified in its charter)
  
  
  
         California                                          77-0387041
  (State or other jurisdiction of                        (I.R.S. employer
  incorporation or organization)                          identification number)
  
  
  
                          Commission file number:  0-25034
                                          
  
                              2860 West Bayshore Road
                            Palo Alto, California 94303
               (Address of principal executive offices and zip code)
  
  
         Registrant's telephone number, including area code: (650) 813-8200
                                          
  <PAGE>
   
  Item 5.  Other Events.
  
    Reference is hereby made to the Registrant's press releases attached hereto as
  Exhibits 99.1, 99.2, 99.3 and 99.4 which meet the requirements for filing under
  Item 5 and are incorporated herein by reference.
  
  Item 7.  Financial Statements and Exhibits.
  
  Exhibits
  --------
  
  99.1   Press Release dated December 17, 1998.
  
  99.2   Press Release dated January 12, 1999.
  
  99.3   Press Release dated January 26, 1999.
  
  99.4   Press Release dated January 27, 1999.
  
  
  
                                         2
  <PAGE>
   
                                     SIGNATURES
  
             Pursuant to the requirements of the Securities Exchange Act of 1934,
       as amended, the Registrant has duly caused this report to be signed on its
       behalf by the undersigned hereunto duly authorized.
  
                                           Greater Bay Bancorp
                                           (Registrant)
  
   
   
  Dated: February 4, 1999                  By:   /s/ Linda M. Iannone
                                                 --------------------
                                                 Linda M. Iannone
                                                 Senior Vice President and General
                                                 Counsel
  
  
                                         3
  <PAGE>
   
                                   Exhibit Index
                                   -------------
  
  99.1       Press Release dated December 17, 1998
   
  99.2       Press Release dated January 12, 1999
   
  99.3       Press Release dated January 26, 1999
   
  99.4       Press Release dated January 27, 1999
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K", "secsgml_size_bytes": 2753}]
metadata_filer: {"company-data": {"conformed-name": "GREATER BAY BANCORP", "cik": "0000775473", "assigned-sic": "6021", "irs-number": "770387041", "state-of-incorporation": "CA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-25034", "film-number": "99521058"}, "business-address": {"street1": "2860 WEST BAYSHORE ROAD", "city": "PALO ALTO", "state": "CA", "zip": "94303", "phone": "4153751555"}, "mail-address": {"street1": "2860 BAYSHORE ROAD", "street2": "420 COWPER ST", "city": "PALO ALTO", "state": "CA", "zip": "943011504"}, "former-company": [{"former-conformed-name": "MID PENINSULA BANCORP", "date-changed": "19941031"}, {"former-conformed-name": "SAN MATEO COUNTY BANCORP", "date-changed": "19920703"}]}
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): December 17, 1998
  
                                Greater Bay Bancorp
               (Exact name of registrant as specified in its charter)
  
         California                                          77-0387041
  (State or other jurisdiction of                        (I.R.S. employer
  incorporation or organization)                          identification number)
  
                          Commission file number:  0-25034
                                          
  
                              2860 West Bayshore Road
                            Palo Alto, California 94303
               (Address of principal executive offices and zip code)
  
         Registrant's telephone number, including area code: (650) 813-8200
  Item 5.  Other Events.
  
    Reference is hereby made to the Registrant's press releases attached hereto as
  Exhibits 99.1, 99.2, 99.3 and 99.4 which meet the requirements for filing under
  Item 5 and are incorporated herein by reference.
  
  Item 7.  Financial Statements and Exhibits.
  
  Exhibits
  --------
  
  99.1   Press Release dated December 17, 1998.
  
  99.2   Press Release dated January 12, 1999.
  
  99.3   Press Release dated January 26, 1999.
  
  99.4   Press Release dated January 27, 1999.
  
                                         2
  SIGNATURES
  
             Pursuant to the requirements of the Securities Exchange Act of 1934,
       as amended, the Registrant has duly caused this report to be signed on its
       behalf by the undersigned hereunto duly authorized.
  
                                           Greater Bay Bancorp
                                           (Registrant)
  
   
   
  Dated: February 4, 1999                  By:   /s/ Linda M. Iannone
                                                 --------------------
                                                 Linda M. Iannone
                                                 Senior Vice President and General
                                                 Counsel
  
                                         3
  Exhibit Index
                                   -------------
  
  99.1       Press Release dated December 17, 1998
   
  99.2       Press Release dated January 12, 1999
   
  99.3       Press Release dated January 26, 1999
   
  99.4       Press Release dated January 27, 1999