<PAGE>   1

                       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, 1996
                         Commission File Number 33-11924

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



         Delaware                                           Not Applicable
-----------------------------                              -------------------
(State or other jurisdiction                               (I.R.S. Employer
of establishment of Trusts)                                Identification No.)
 
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 
    ---      ---
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                       CS FBC MORTGAGE SECURITIES TRUST 22
                               AND SIMILAR TRUSTS
                                      INDEX
<TABLE>
<CAPTION>
                                                                           Page
                                                                          Number
                                                                          ------
<S>                                                                         <C>
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
</TABLE>


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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, 1996 have
              not been prepared in as much as the reporting entities have not
              commenced operations as of that date.

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

              The Trusts are formed under the laws of the state of Delaware by a
              trust agreement between CS 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. Administration of the trusts
              will be performed on behalf of the Owner Trustee by an indirect
              wholly owned subsidiary of CS First Boston, Inc. 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>   4
                       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.

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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.


                                       CS 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:  October 25, 1996


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                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>
Exhibit
Number         Description of Exhibit                                                 Page
------         ----------------------                                                 ----
<S>            <C>                                                                    <C>
3(a)           Form of Trust Agreement [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 of Bond Administration Agreement [for REMIC Bonds]                 *

</TABLE>



*        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.

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