PAINEWEBBER SECURITIES TRUST 51 West 52nd Street New York, New York 10019-6114 VIA EDGAR Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Re: PaineWebber Securities Trust (File Nos. 33-55374 and 811-7374) Accession #: 0000928385-01-502242 CIK #: 0000894632 Ladies and Gentlemen: The purpose of this letter is to request that the amendment to the registration statement on Form N-1A for PaineWebber Securities Trust, filed on November 2, 2001 (Accession #: 0000928385-01-502242), be withdrawn from the SEC's database. We inadvertently filed an amendment for a different registrant (Brinson Securities Trust) using the filing submission information for PaineWebber Securities Trust. Brinson Securities Trust has subsequently filed the correct amendment for Brinson Securities Trust on November 6, 2001 (Accession #: 0000928385-01-502280). We respectfully request that the SEC withdraw the amendment filed on November 2, 2001 for PaineWebber Securities Trust (Accession #: 0000928385-01-502242) pursuant to Rule 477(a) under the Securities Act of 1933. No securities were sold in connection with this amendment. We appreciate your prompt attention to this matter and would be happy to provide additional information you might require. Sincerely, /s/ Amy R. Doberman Amy R. Doberman Vice President and Secretary PaineWebber Securities Trust