<PAGE>

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

                                 UNITED STATES
                       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): July 28, 2006

                    CHL Mortgage Pass-Through Trust 2006-J4
                       (Exact name of the issuing entity)
                 Commission File Number of the issuing entity:
                                 333-131662-11

                                  CWMBS, Inc.
                (Exact name of the depositor as specified in its
                     charter) Commission File Number of the
                             depositor: 333-131662

                          Countrywide Home Loans Inc.
            (Exact name of the sponsor as specified in its charter)

             Delaware                                95-4449516
             --------                                ----------
   (State or Other Jurisdiction                   (I.R.S. Employer
of Incorporation of the depositor)      Identification No. of the depositor)


         4500 Park Granada
        Calabasas, California                             91302
        ---------------------                           ---------
        (Address of Principal                           (Zip Code)
 Executive Offices of the depositor)

The depositor's telephone number, including area code (818) 225-3000
                                                      --------------

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

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any
following provisions:

[ ]      Written communications pursuant to Rule 425 under the Securities Act
         (17 CFR 230.425)

[ ]      Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act
         (17 CFR 240.14a- 12(b))

[ ]      Pre-commencement communications pursuant to Rule 14d-2(b) under the
         Exchange Act (17 CFR 240.14d-2(b))

[ ]      Pre-commencement communications pursuant to Rule 13e-4(c) under the
         Exchange Act (17 CFR 240.13e-4(c))


<PAGE>

Section 7 Regulation FD

Item 7.01 Regulation FD Disclosure.

         On July 28, 2006, CWMBS, Inc. (the "Depositor") created CHL Mortgage
Pass-Through Trust 2006-J4 (the "Issuing Entity") pursuant to a Pooling and
Servicing Agreement, dated as of July 1, 2006 (the "Pooling and Servicing
Agreement"), among the Depositor, Countrywide Home Loans, Inc., as a seller,
Park Grananda LLC, as a seller, Park Monaco Inc., as a seller, Park Sienna LLC,
as a seller, Countrywide Home Loans Servicing LP, as master servicer, and The
Bank of New York, as trustee. Capitalized terms used but not defined herein
shall have the respective meanings assigned to them in the Pooling and Servicing
Agreement.

         On July 28, 2006, the Depositor transferred the Initial Mortgage Loans
to the Issuing Entity. The loan level data tape attached hereto as Exhibit 99.1
describes characteristics of each Initial Mortgage Loan as of its Initial
Cut-off Date.

Item 9.01.  Financial Statements and Exhibits.

(a) Not applicable.

(b) Not applicable.

(c) Exhibits:

    Exhibit No.       Description
    -----------       -----------

     99.1             Characteristics of the Initial Mortgage Loans







<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 hereunto duly authorized.

                                                    CWMBS, INC.




                                                    By: /s/ Darren Bigby
                                                        ----------------------
                                                    Name: Darren Bigby
                                                    Title:  Vice President


Dated:  August 2, 2006


<PAGE>




                                  Exhibit Index



Exhibit No.     Description
-----------     -----------

  99.1          Characteristics of the Initial Mortgage Loans
[{"type": "8-K", "sequence": "1", "filename": "b414311_8k.txt", "description": "FORM 8-K", "secsgml_size_bytes": 4619}]
{"company-data": {"conformed-name": "CHL Mortgage Pass-Through Trust 2006-J4", "cik": "0001369462", "assigned-sic": "6189", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-131662-11", "film-number": "06996701"}, "business-address": {"street1": "4500 PARK GRANADA", "city": "CALABASAS", "state": "CA", "zip": "91302", "phone": "8183325300"}, "mail-address": {"street1": "4500 PARK GRANADA", "city": "CALABASAS", "state": "CA", "zip": "91302"}}
--------------------------------------------------------------------------------

                                 UNITED STATES
                       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): July 28, 2006

                    CHL Mortgage Pass-Through Trust 2006-J4
                       (Exact name of the issuing entity)
                 Commission File Number of the issuing entity:
                                 333-131662-11

                                  CWMBS, Inc.
                (Exact name of the depositor as specified in its
                     charter) Commission File Number of the
                             depositor: 333-131662

                          Countrywide Home Loans Inc.
            (Exact name of the sponsor as specified in its charter)

             Delaware                                95-4449516
             --------                                ----------
   (State or Other Jurisdiction                   (I.R.S. Employer
of Incorporation of the depositor)      Identification No. of the depositor)

         4500 Park Granada
        Calabasas, California                             91302
        ---------------------                           ---------
        (Address of Principal                           (Zip Code)
 Executive Offices of the depositor)

The depositor's telephone number, including area code (818) 225-3000
                                                      --------------

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

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any
following provisions:

[ ]      Written communications pursuant to Rule 425 under the Securities Act
         (17 CFR 230.425)

[ ]      Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act
         (17 CFR 240.14a- 12(b))

[ ]      Pre-commencement communications pursuant to Rule 14d-2(b) under the
         Exchange Act (17 CFR 240.14d-2(b))

[ ]      Pre-commencement communications pursuant to Rule 13e-4(c) under the
         Exchange Act (17 CFR 240.13e-4(c))
Section 7 Regulation FD

Item 7.01 Regulation FD Disclosure.

         On July 28, 2006, CWMBS, Inc. (the "Depositor") created CHL Mortgage
Pass-Through Trust 2006-J4 (the "Issuing Entity") pursuant to a Pooling and
Servicing Agreement, dated as of July 1, 2006 (the "Pooling and Servicing
Agreement"), among the Depositor, Countrywide Home Loans, Inc., as a seller,
Park Grananda LLC, as a seller, Park Monaco Inc., as a seller, Park Sienna LLC,
as a seller, Countrywide Home Loans Servicing LP, as master servicer, and The
Bank of New York, as trustee. Capitalized terms used but not defined herein
shall have the respective meanings assigned to them in the Pooling and Servicing
Agreement.

         On July 28, 2006, the Depositor transferred the Initial Mortgage Loans
to the Issuing Entity. The loan level data tape attached hereto as Exhibit 99.1
describes characteristics of each Initial Mortgage Loan as of its Initial
Cut-off Date.

Item 9.01.  Financial Statements and Exhibits.

(a) Not applicable.

(b) Not applicable.

(c) Exhibits:

    Exhibit No.       Description
    -----------       -----------

     99.1             Characteristics of the Initial Mortgage Loans
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 hereunto duly authorized.

                                                    CWMBS, INC.

                                                    By: /s/ Darren Bigby
                                                        ----------------------
                                                    Name: Darren Bigby
                                                    Title:  Vice President

Dated:  August 2, 2006
Exhibit Index

Exhibit No.     Description
-----------     -----------

  99.1          Characteristics of the Initial Mortgage Loans