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): APRIL 30, 1999
  
  
                                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.
  
       On April 30, 1999, Greater Bay Bancorp (the "Registrant") entered into an
  Agreement and Plan of Reorganization with Bay Commercial Services ("BCS")
  providing for the merger of BCS with and into the Registrant (the "Merger"),
  subject to the terms and conditions therein, including the receipt of all
  required regulatory approvals and the approval of the shareholders of BCS.
  Following consummation of the Merger, Bay Bank of Commerce, a wholly owned
  subsidiary of BCS, will become a wholly owned subsidiary of the Registrant.
  
  ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.
  
  Exhibits
  --------
  
   2   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
       between Greater Bay Bancorp and Bay Commercial Services
  
  99.1 Press Release dated May 3, 1999
  <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: May 4, 1999                           By:  /s/ Linda M. Iannone
                                                    --------------------
                                                    Linda M. Iannone
                                                    Senior Vice President and 
                                                    General Counsel
  <PAGE>
   
                                   EXHIBIT INDEX
                                   -------------
   2    Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
        between Greater Bay Bancorp and Bay Commercial Services
  
  99.1  Press Release dated May 3, 1999
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K DATED APRIL 30, 1999", "secsgml_size_bytes": 2927}]
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": "99611903"}, "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): APRIL 30, 1999
  
                                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.
  
       On April 30, 1999, Greater Bay Bancorp (the "Registrant") entered into an
  Agreement and Plan of Reorganization with Bay Commercial Services ("BCS")
  providing for the merger of BCS with and into the Registrant (the "Merger"),
  subject to the terms and conditions therein, including the receipt of all
  required regulatory approvals and the approval of the shareholders of BCS.
  Following consummation of the Merger, Bay Bank of Commerce, a wholly owned
  subsidiary of BCS, will become a wholly owned subsidiary of the Registrant.
  
  ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.
  
  Exhibits
  --------
  
   2   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
       between Greater Bay Bancorp and Bay Commercial Services
  
  99.1 Press Release dated May 3, 1999
  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: May 4, 1999                           By:  /s/ Linda M. Iannone
                                                    --------------------
                                                    Linda M. Iannone
                                                    Senior Vice President and 
                                                    General Counsel
  EXHIBIT INDEX
                                   -------------
   2    Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
        between Greater Bay Bancorp and Bay Commercial Services
  
  99.1  Press Release dated May 3, 1999