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): October 14, 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.
  
       (a)  On October 15, 1999, Greater Bay Bancorp (the "Registrant")
  consummated its merger with Bay Commercial Services ("BCS") pursuant to an
  Agreement and Plan of Reorganization, dated as of April 30, 1999 (the
  "Agreement"), providing for the merger of BCS with and into the Registrant (the
  "Merger"). In accordance with the Agreement, former shareholders of BCS received
  0.6833 shares of the Registrant's common stock in exchange for each of their
  shares of BCS common stock. As a result of the Merger, Bay Bank of Commerce,
  formerly a wholly owned subsidiary of BCS, became a wholly owned subsidiary of
  the Registrant. The Merger was accounted for as a pooling of interests.
  
       The Registrant issued a press release announcing completion of the Merger
  on October 15, 1999, a copy of which is attached hereto as Exhibit 99.1.
  
       For a more detailed discussion of the terms and conditions of the Agreement
  and the Merger, reference is made to the Registrant's Registration Statement on
  Form S-4 (Registration No. 333-82355) filed with the Securities and Exchange
  Commission on July 7, 1999, as amended by Amendment No. 1 thereto filed with the
  Securities and Exchange Commission on August 4, 1999, incorporated herein by
  this reference.
  
       (b) On October 14, 1999, the Registrant issued a press release announcing
  its third quarter earnings, a copy of which is attached hereto as Exhibit 99.2.
  
  Item 7.  Financial Statements and Exhibits.
  
  Exhibits
  --------
  
   2.1   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
         between Greater Bay Bancorp and Bay Commercial Services (incorporated by
         reference from the Registrant's Current Report on Form 8-K dated May 6,
         1999)
  
  99.1   Press Release dated October 15, 1999
  
  99.2   Press Release dated October 14, 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: October 19, 1999                    By: /s/ Linda M. Iannone
                                                 --------------------
                                                 Linda M. Iannone
                                                 Senior Vice President and General
                                                 Counsel
  
                                         3
  <PAGE>
  
                                   Exhibit Index
                                   -------------
  
   2.1   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
         between Greater Bay Bancorp and Bay Commercial Services (incorporated by
         reference from the Registrant's Current Report on Form 8-K dated May 6,
         1999)
  
  99.1   Press Release dated October 15 1999
  
  99.2   Press Release dated October 14, 1999
  
                                         4
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K", "secsgml_size_bytes": 4170}]
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": "99730741"}, "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): October 14, 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.
  
       (a)  On October 15, 1999, Greater Bay Bancorp (the "Registrant")
  consummated its merger with Bay Commercial Services ("BCS") pursuant to an
  Agreement and Plan of Reorganization, dated as of April 30, 1999 (the
  "Agreement"), providing for the merger of BCS with and into the Registrant (the
  "Merger"). In accordance with the Agreement, former shareholders of BCS received
  0.6833 shares of the Registrant's common stock in exchange for each of their
  shares of BCS common stock. As a result of the Merger, Bay Bank of Commerce,
  formerly a wholly owned subsidiary of BCS, became a wholly owned subsidiary of
  the Registrant. The Merger was accounted for as a pooling of interests.
  
       The Registrant issued a press release announcing completion of the Merger
  on October 15, 1999, a copy of which is attached hereto as Exhibit 99.1.
  
       For a more detailed discussion of the terms and conditions of the Agreement
  and the Merger, reference is made to the Registrant's Registration Statement on
  Form S-4 (Registration No. 333-82355) filed with the Securities and Exchange
  Commission on July 7, 1999, as amended by Amendment No. 1 thereto filed with the
  Securities and Exchange Commission on August 4, 1999, incorporated herein by
  this reference.
  
       (b) On October 14, 1999, the Registrant issued a press release announcing
  its third quarter earnings, a copy of which is attached hereto as Exhibit 99.2.
  
  Item 7.  Financial Statements and Exhibits.
  
  Exhibits
  --------
  
   2.1   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
         between Greater Bay Bancorp and Bay Commercial Services (incorporated by
         reference from the Registrant's Current Report on Form 8-K dated May 6,
         1999)
  
  99.1   Press Release dated October 15, 1999
  
  99.2   Press Release dated October 14, 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: October 19, 1999                    By: /s/ Linda M. Iannone
                                                 --------------------
                                                 Linda M. Iannone
                                                 Senior Vice President and General
                                                 Counsel
  
                                         3
  Exhibit Index
                                   -------------
  
   2.1   Agreement and Plan of Reorganization, dated as of April 30, 1999, by and
         between Greater Bay Bancorp and Bay Commercial Services (incorporated by
         reference from the Registrant's Current Report on Form 8-K dated May 6,
         1999)
  
  99.1   Press Release dated October 15 1999
  
  99.2   Press Release dated October 14, 1999
  
                                         4