<PAGE>
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): June 4, 1998
Credit Suisse First Boston Mortgage Securities Corp.
--------------------------------------------------------------
(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
DELAWARE 333-51771 13-3320910
- -------------------------------------------------------------------------------
(STATE OR OTHER JURISDICTION (COMMISSION) (I.R.S. EMPLOYER
OF INCORPORATION) FILE NUMBER) IDENTIFICATION 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
Not Applicable
- -------------------------------------------------------------------------------
(FORMER NAME OR FORMER ADDRESS, IF CHANGED SINCE LAST REPORT)
Exhibit Index Located on Page 2
<PAGE>
ITEM 5. OTHER EVENTS.
On or about June 26, 1998, the Registrant will cause the issuance and
sale of approximately $2.48 billion initial principal amount of Credit Suisse
First Boston Mortgage Securities Corp., Commercial Mortgage Pass-Through
Certificates, Series 1998-C1, Class A-1A, A-1B, A-1MF, Class A-X, Class B,
Class C, Class D, Class E, Class F, Class G, Class H, Class I and Class V-1
(the "Certificates") pursuant to a Pooling and Servicing Agreement to be dated
as of June 1, 1998, among the Registrant, a servicer to be determined (the
"Servicer"), a special servicer to be determined (the "Special Servicer") and
State Street Bank and Trust Company, as trustee (the "Trustee"). In connection
with the sale of the Class A-1A, Class A-1B, Class A-1MF, Class A-X, Class B,
Class C, Class D and Class E Certificates (the "Publicly Offered
Certificates"), the Registrant has been advised by Credit Suisse First Boston
Corporation and PaineWebber Incorporated (the "Underwriters"), that the
Underwriters have furnished to prospective investors certain written
descriptions of the securities to be offered that set forth the name of the
issuer, the size of the potential offering, the structure of the offering (e.g.
the number of classes, seniority, interest rate) and miscellaneous similar
items (the "Structural Term Sheets") with respect to the Publicly Offered
Certificates following the effective date of Registration Statement No.
333-51771 but prior to the availability of a final Prospectus relating to the
Publicly Offered Certificates. In connection with the sale of the Publicly
Offered Certificates, the Registrant also has been informed by the Underwriters
that the Underwriters have furnished to prospective investors certain
descriptive information regarding the mortgage loans (the "Mortgage Loans")
underlying the Certificates that set forth the number of Mortgage Loans, the
principal balance of the Mortgage Loans, information regarding the mortgage
rates thereon and miscellaneous similar items (the "Collateral Term Sheets")
following the effective date of Registration Statement No. 333-51771 but prior
to the availability of a final Prospectus relating to the Publicly Offered
Certificates. The Structural Terms Materials and Collateral Term Sheets are
being filed as an exhibit to this report.
The Structural Term Sheets and Collateral Term Sheets attached hereto
have been provided by the Underwriters. The information in the Structural Term
Sheets and Collateral Term Sheets is preliminary and may be superseded by the
Prospectus Supplement relating to the Publicly Offered Certificates and by any
other information subsequently filed with the Securities and Exchange
Commission.
2
<PAGE>
ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.
List below the financial statements, pro forma financial information
and exhibits, if any, filed as part of this report.
(a) Financial Statements of Businesses Acquired.
Not applicable
(b) Pro Forma Financial Information.
Not applicable
(c) Exhibits.
99.1 Structural Term Sheets prepared by the Underwriters in
connection with the sale of the Publicly Offered
Certificates of the Registrant, filed pursuant to Rule
202 of Regulation S-T (filed in paper).
99.2 Collateral Term Sheets prepared by the Underwriters in
connection with the sale of the Publicly Offered
Certificates of the Registrant, filed pursuant to Rule
202 of Regulation S-T (filed in paper).
3
<PAGE>
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.
CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES
CORP., Registrant
By: /s/ Allan J. Baum
-------------------------------------------
Name: Allan J. Baum
Title: Vice President
Dated: June 4, 1998
<PAGE>
INDEX OF EXHIBITS
Exhibit Description Page
------- ----------- ----
99.1 Structural Term Sheets prepared
by the Underwriters in connection
with the sale of the Publicly Offered
Certificates of the Registrant, filed
pursuant to Rule 202 of Regulation
S-T (filed in paper).
99.2 Collateral Term Sheets prepared by the
Underwriters in connection with the
sale of the Publicly Offered
Certificates of the Registrant, filed
pursuant to Rule 202 of Regulation
S-T (filed in paper).