File No. 333-52115 As filed with the Securities and Exchange Commission on November 2, 1998. SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AS A FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 UST CORP. (Exact name of Registrant as specified in its charter) Massachusetts 04-2436093 (State or other jurisdiction (I.R.S. Employer or incorporation or organization) Indemnification No.) 40 Court Street, Boston, MA 02108 (Address of Principal Executive Offices) (Zip Code) 1986 Lexington Savings Bank Stock Option Plan 1994 Lexington Savings Bank Stock Option Plan 1993 Main Street Community Bancorp, Inc. Stock Option Plan 1995 Affiliated Community Bancorp, Inc. Stock Option Plan Eric R. Fischer, Esq., Executive Vice President, General Counsel and Clerk UST Corp. 40 Court Street Boston, MA 02108 (617) 726-7377 (Name, address, including zip code and telephone number, including area code of agent for service) PART II INFORMATION REQUIRED IN PROSPECTUS Item 8. Exhibits The following exhibits are part of this Registration Statement: 5* Opinion and Consent of Eric R. Fischer, Esq., General Counsel of UST,as to the validity of the shares of Common Stock. 23.1* Consent of Eric R. Fischer (included in Exhibit 5). 23.2* Consent of Arthur Andersen LLP (concerning UST financials). 23.3* Consent of Arthur Andersen LLP (concerning AFCB financials) 23.4 Consent of KPMG Peat Marwick LLP (concerning financial statements of The Federal Savings Bank) 24* Power of Attorney. _________________________________________________________ * Previously filed [Remainder of page intentionally left blank] SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements of filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, and The Commonwealth of Massachusetts, on the 2nd day of November, 1998. UST Corp. By: /s/Eric R. Fischer ----------------------------- Eric R. Fischer (Executive Vice President, General Counsel and Clerk) Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated. Signature Title Date * ________________________ President and Chief Executive November 2, 1998 (Neal F. Finnegan) Officer (Principal Executive Officer) and Director * ________________________ Executive Vice President and November 2, 1998 (James K. Hunt) Treasurer (Principal Financial Officer and Principal Accounting Officer) * ________________________ Director November 2, 1998 (Chester G. Atkins) * ________________________ Director November 2, 1998 (David E. Bradbury) ________________________ Director November _, 1998 (Kendrick G. Bushnell) ________________________ Director November _, 1998 (Jack E. Chappell) * ________________________ Director November 2, 1998 (Robert M. Coard) * ________________________ Director November 2, 1998 (Robert L. Culver) * ________________________ Director November 2, 1998 (Alan K. DerKazarian) * ________________________ Director November 2, 1998 (Donald C. Dolben) ________________________ Director November _, 1998 (James F. Drew) ________________________ Vice Chairman, Chief Operating November _, 1998 (Timothy J. Hansberry) Officer and Director ________________________ Director November _, 1998 (Edward S. Heald) * ________________________ Director November 2, 1998 (Brian W. Hotarek) ________________________ Director November _, 1998 (James E. McCobb, Jr.) * ________________________ Director November 2, 1998 (Francis X. Messina) * ________________________ Director November 2, 1998 (Sydney L. Miller) * ________________________ Director November 2, 1998 (Vikki L. Pryor) * ________________________ Director November 2, 1998 (Gerald M. Ridge) * ________________________ Director November 2, 1998 (William Schwartz) * ________________________ Director November 2, 1998 (Barbara C. Sidell) * ________________________ Director November 2, 1998 (James V. Sidell) * ________________________ Director November 2, 1998 (Paul D. Slater) * ________________________ Director November 2, 1998 (Edward J. Sullivan) * ________________________ Director November 2, 1998 (G. Robert Tod) * ________________________ Director November 2, 1998 (Michael J. Verrochi, Jr.) * ________________________ Director November 2, 1998 (Gordon M. Weiner) *By: /s/Eric R. Fischer November 2, 1998 ----------------------- (Eric R. Fischer, Attorney-in-Fact) EXHIBIT INDEX Exhibit No. Description of Documents 5* Opinion and Consent of Eric R. Fischer, General -- Counsel of UST, as to the validity of the shares of Common Stock being offered herein. 23.1* Consent of Eric R. Fischer (included in Exhibit 5). --- 23.2* Consent of Arthur Andersen LLP (concerning UST -- financials). 23.3* Consent of Arthur Andersen LLP (concerning AFCB -- financials) 23.4 Consent of KPMG Peat Marwick LLP (concerning financials of The Federal Savings Bank 24* Power of Attorney --- _____________________ * Previously filed