<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 10-Q

            ---------------------------------------------------------

                QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934


                      For Quarter Ended September 30, 1999
                         Commission File Number 33-11924


             CS FBC MORTGAGE SECURITIES TRUST 22 AND SIMILAR TRUSTS
   OF WHICH CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP. IS DEPOSITOR
   --------------------------------------------------------------------------
      (Exact name of registrant as specified in its governing instruments)


            DELAWARE                                NOT APPLICABLE
-------------------------------           ------------------------------------
(State or other jurisdiction of           (I.R.S. Employer Identification No.)
    establishment of Trusts)

 c/o Wilmington Trust Company
     Rodney Square North
     WILMINGTON, DELAWARE                               19890
 ----------------------------                        ----------
  (Address of Owner Trustee)                         (Zip Code)


Owner Trustee's telephone number, including area code 302-651-1000

Securities registered pursuant to Section 12(b) of the Act: None.

Securities registered pursuant to Section 12(g) of the Act: None.


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes |X| No |_|
<PAGE>

                       CS FBC MORTGAGE SECURITIES TRUST 22
                                AND SIMILAR TRUST
                                      INDEX

                                                                           Page
                                                                          Number
                                                                          ------
PART I            FINANCIAL INFORMATION

         Item     1.  Financial Statements                                  3


         Item     2.  Management's Discussion and Analysis of Financial
                                   Condition and Results of Operations      3

PART II           OTHER INFORMATION

         Item     1.  Legal Proceedings                                     4

         Item     2.  Changes in Securities                                 4

         Item     3.  Defaults Upon Senior Securities                       4

         Item     4.  Submission of Matters to a Vote of Security Holders   4

         Item     5.  Other Information                                     4

         Item     6.  Exhibits and Reports on Form 8-K                      4

SIGNATURE                                                                   5

INDEX TO EXHIBITS                                                           6


                                     Page 2
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                       CS FBC MORTGAGE SECURITIES TRUST 22
                               AND SIMILAR TRUSTS


PART I         FINANCIAL INFORMATION


Item 1.        FINANCIAL STATEMENTS

               Financial statements for the period ended September 30, 1999 have
               not been prepared in as much as the reporting entities have not
               commenced operations as of that date.

               Registration Statement No. 33-11924 was filed on Form S-11 by
               Credit Suisse First Boston Mortgage Securities Corp., on February
               12, 1987 with the Securities and Exchange Commission which
               provided for the issuance of up to $2,000,000,000 aggregate
               principal amount of Collateralized Mortgage Obligations. As of
               the date of this report, the trusts have been formed and have not
               issued any Bonds.

               The Trusts are formed under the laws of the state of Delaware by
               a trust agreement between Credit Suisse First Boston Mortgage
               Securities Corp., as depositor, and Wilmington Trust Company, as
               Owner Trustee (the "Owner Trustee"). Subsequent to the issuance
               of the Bonds of Trust 22 and Similar Trusts, the Depositor may
               sell all or a part of its ownership interest in the related
               trusts to other investors.

               The powers and activities of the aforementioned trusts are
               limited to the issuance of Bonds, the acquisition of
               mortgage-backed certificates to collateralize the Bonds, the
               administration of the Bonds and other related activities. As of
               the date of this report, the trusts have not issued any bonds.


Item 2.        MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
               RESULTS OF OPERATIONS

               Not applicable.


                                     Page 3
<PAGE>

                       CS FBC MORTGAGE SECURITIES TRUST 22
                               AND SIMILAR TRUSTS


PART II           OTHER INFORMATION

Item 1.           LEGAL PROCEEDINGS

                  None.

Item 2.           CHANGES IN SECURITIES

                  Not applicable.

Item 3.           DEFAULTS UPON SENIOR SECURITIES

                  Not applicable.

Item 4.           SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

                  Not applicable.

Item 5.           OTHER INFORMATION

                  None

Item 6.           EXHIBITS AND REPORTS ON FORM 8-K

                  (a) EXHIBITS:

                      Form of Trust Agreement (for non-REMIC Bonds)
                      (incorporated by reference to Exhibit 3(a) of Registration
                      Statement on Form S-11 (No. 33-11924) dated February 12,
                      1987).

                      Form of Trust Agreement (for REMIC Bonds) (incorporated by
                      reference to Exhibit 3(b) of Registration Statement on
                      Form S-11 (No. 33-11924) dated February 12, 1987).

                      Form of Indenture (incorporated by reference to Exhibit 4
                      of Registration Statement on Form S-11 (No. 33-11924)
                      dated February 12, 1987).

                      Form of Bond Administration Agreement (for non-REMIC
                      Bonds) (incorporated by reference to Exhibit 10(a) of
                      Registration Statement on Form S-11 (No. 33-11924) dated
                      February 12, 1987).

                      Form of Bond Administration Agreement (for REMIC Bonds)
                      (incorporated by reference to Exhibit 10(b) of
                      Registration Statement on Form S-11 (No. 33-11924) dated
                      February 12, 1987).

                  (b) REPORTS ON FORM 8-K None.


                                     Page 4
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                                    SIGNATURE


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., as
                                            Depositor, on behalf of
                                            CS FBC Mortgage Securities
                                            Trust 22 and Similar Trusts


                                            By:    /s/ THOMAS M. ZINGALLI
                                               ---------------------------------
                                                     Thomas M. Zingalli
                                                  Controller and Principal
                                                      Accounting Officer
                                                (Duly Authorized Officer and
                                                 Principal Accounting Officer)


Dated: November 8, 1999


                                     Page 5
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                                INDEX TO EXHIBITS

Exhibit
Number       Description of Exhibit                                        Page
-------      ----------------------                                        ----

3(a)         Form of Trust Agremment (for non-REMIC Bonds)                  *

3(b)         Form of Trust Agreement (for REMIC Bonds)                      *

4            Form of Indenture                                              *

10(a)        Form of Bond Administration Agreement (for non-REMIC Bonds)    *

10(b)        Form on Bond Administration Agreement (for REMIC Bonds)        *


*     Incorporated by reference to the same Exhibits in Registration Statement
      on Form S-11 (No. 33- 11924) filed with the Securities and Exchange
      Commission on February 12, 1987.


                                     Page 6