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 #0-9623


                                   UST Corp.
   --------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

                  40 Court Street, Boston, Massachusetts 02108
                                 (617) 726-7000
   --------------------------------------------------------------------------
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                    Common Stock, $0.625 par value per share
   --------------------------------------------------------------------------
            (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)  [X]          Rule 12h-3(b)(1)(ii) [ ]
Rule 12g-4(a)(1)(ii) [ ]          Rule 12h-3(b)(2)(i)  [ ]
Rule 12g-4(a)(2)(i)  [ ]          Rule 12h-3(b)(2)(ii) [ ]
Rule 12g-4(a)(2)(ii) [ ]          Rule 15d-6           [ ]
Rule 12h-3(b)(1)(i)  [X]

     Approximate number of holders of record as of the certificate or notice
date: 1

     Pursuant to the requirements of the Securities Exchange Act of 1934, UST
Corp. has caused this Certification and Notice of Termination to be signed on
its behalf by the undersigned duly authorized person.

DATE: January 11, 2000       BY:  /s/ Joel J. Brickman
                                -----------------------------
                                    Joel J. Brickman
                                    Clerk