UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                     FORM 15


CERTIFICATION  AND NOTICE OF TERMINATION OF REGISTRATION  UNDER SECTION 12(g) OF
THE SECURITIES  EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER
SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.


                         Commission File Number  333-77054-12

              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
             (Exact name of registrant as specified in its charter)

              11 Madison Avenue,  New York, NY 10010   (212)325-2000
   (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)


                Credit Suisse First Boston Mortgage Securities Corp.,
          CSFB Mortgage-Backed Pass-Through Certificates, Series 2002-S12
             (Title of each class of securities covered by this Form)


                                      None
       (Titles of all other classes of securities for which a duty to file
                  reports under section 13(a) or 15(d) remains)


    Please  place  an X in  the  box(es)  to  designate,  the  appropriate  rule
provision(s) relied upon to terminate or suspend the duty to file reports:

  Rule 12g-4(a)(1)(i)                                 Rule 12h-3(b)(1)(i)     X
  Rule 12g-4(a)(1)(ii)                                Rule 12h-3(b)(1)(ii)
  Rule 12g-4(a)(2)(i)                                 Rule 12h-3(b)(2)(i)
  Rule 12g-4(a)(2)(ii)                                Rule 12h-3(b)(2)(ii)
                                                      Rule 15d-6              X

    Approximate  number of holders of record as of the  certification  or notice
date:  38

     Pursuant to the requirements of the Securities Exchange Act of 1934, Credit
Suisse   First   Boston    Mortgage    Securities    Corp.   has   caused   this
certification/notice  to be  signed  on  its  behalf  by  the  undersigned  duly
authorized person.

             JPMorgan  Chase  Bank in its capacity  as Trustee
             under  the Pooling and Servicing Agreement on behalf of
             Credit Suisse First Boston Mortgage Securities Corp., Registrant



              By:      /s/ Andreas Auer
                       -------------------------------------------------------
              Name:    Andreas Auer
              Title:   Vice President

              Date:    January 29, 2003