8-K 1 efc1-0811_853738form8k.txt 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): August 15, 2001 Credit Suisse First Boston Mortgage Securities Corp. CSFB ABS Trust 2001-HE20 CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP. ---------------------------------------------------------------- (Exact name of registrant as specified in its charter)

Delaware 333-~~44300-02~~49820 13-~~3354848~~3320910 ----------------------------------- ---------------- ------------------------------------ (State or Other Jurisdiction of (Commission (I.R.S. Employer Identification Incorporation) File Number) No.)

11 Madison Avenue New York, New York 10010 --------------------------------------------------------------- (Address of Principal Executive Offices) (Zip Code) Registrant's telephone number, including area code (212) 325-2000 ----- -------- Item 5. Other Events. ---- ------------ Filing of Computational Materials --------------------------------- Pursuant to Rule 424(b) under the Securities Act of 1933, concurrently with, or subsequent to, the filing of this Current Report on Form 8-K (the "Form 8-K"), Credit Suisse First Boston Mortgage Securities Corp. (the "Company") is filing a prospectus and prospectus supplement with the Securities and Exchange Commission relating to its Credit Suisse First Boston Mortgage Securities Corp. CSFB ABS Trust 2001-HE20. In connection with the offering of the Credit Suisse First Boston Mortgage Securities Corp., CSFB ABS Trust 2001-HE20, Credit Suisse First Boston Corporation ("CSFB"), as underwriter of the Certificates, has prepared certain materials (the "Computational Materials") for distribution to their potential investors. Although the Company provided CSFB with certain information regarding the characteristics of the Mortgage Loans in the related portfolio, the Company did not participate in the preparation of the Computational Materials. For purposes of this Form 8-K, "Computational Materials" shall mean computer generated tables and/or charts displaying, with respect to any Class or Classes of Certificates, any of the following: yield; average life; duration; expected maturity; interest rate sensitivity; loss sensitivity; cash flow characteristics; background information regarding the Mortgage Loans; the proposed structure; decrement tables; or similar information (tabular or otherwise) of a statistical, mathematical, tabular or computational nature. The Computational Materials listed as Exhibit 99.1 hereto are filed on Form SE dated August 15, 2001. Item 7. Financial Statements, Pro Forma Financial Information and Exhibits. ------------------------ (a) Not applicable. (b) Not applicable. (c) Exhibits: 99.1 Computational Materials filed on Form SE dated August 15, 2001. SIGNATURES Filings Made by the Registrant. The registrant has duly caused this form to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State of New York, on August 15, 2001. CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP. By: /s/ Helaine Hebble --------------------- Name: Helaine Hebble Title: Vice President Exhibit Index ------------- Exhibit Page ------- ---- 99.1 Computational Materials filed on Form SE dated August 15, 2001.

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