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): MAY 23, 2005

AMERIQUEST MORTGAGE SECURITIES INC.

(as depositor under the Pooling and Servicing Agreement,

dated as of May 1, 2005, providing for the issuance of

Asset-Backed Pass-Through Certificates, Series 2005-R4)

Ameriquest Mortgage Securities Inc.

(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

Delaware	333-121781	33-0885129
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification Number)

1100 Town & Country Road, Suite 1100 Orange, California 92868		92868
(Address of Principal Executive Offices)		(Zip Code)

Registrant's telephone number, including area code: (714) 564-0600

Item 8.01

Other Events

Description of the Mortgage Pool

Ameriquest Mortgage Securities Inc. (the “Registrant”) plans a series of certificates, entitled Ameriquest Mortgage Securities Inc., Asset-Backed Pass-Through Certificates, Series 2005-R4 (the “Certificates”), to be issued pursuant to a pooling and servicing agreement, dated as of May 1, 2005, among the Registrant as depositor, Ameriquest Mortgage Company as master servicer and Deutsche Bank National Trust Company as trustee. The Certificates to be designated as the Series 2005-R4 Certificates will represent in the aggregate the entire beneficial ownership interest in a trust fund (the “Trust Fund”) consisting primarily of a pool (the “Mortgage Pool”) of conventional, one- to four-family, first lien fixed-rate and adjustable-rate mortgage loans having original terms to maturity up to 30 years (the “Mortgage Loans”).

Collateral Term Sheets

Citigroup Global Markets, Inc. (the “Underwriter”) has advised the Registrant that it has furnished to certain prospective purchasers of Certificates certain materials, herein referred to as “Collateral Term Sheets”, in written form, which Collateral Term Sheets are in the nature of data tables and term sheet information relating to the Mortgage Loans or other assets of the Trust Fund.

The Collateral Term Sheets have been provided by the Underwriter. The information in the Collateral Term Sheets is preliminary and will be superseded by a prospectus supplement relating to the Certificates and by any other information subsequently filed with the Commission.

The Collateral Term Sheets were prepared by the Underwriter at the request of certain prospective investors. The Collateral Term Sheets may be based on information that differs from the information set forth in the prospectus supplement.

Item 9.01		Financial Statements and Exhibits
			(a)	Not applicable
			(b)	Not applicable
			(c)	Exhibits
	Exhibit No.				Description

99.1	Collateral Term Sheets (as defined in Item 5) that have been provided by Citigroup Global Markets, Inc. to certain prospective purchasers of Ameriquest Mortgage Securities Inc., Asset-Backed Pass-Through Certificates, Series 2005-R4.

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.

Dated: May 23, 2005

AMERIQUEST MORTGAGE SECURITIES INC.

By:

/s/ John P. Grazer

Name: John P. Grazer

Title: CFO

Index to Exhibits

Exhibit No.

Description

Sequentially

Numbered Page

99.1

Collateral Term Sheets (as defined in Item 5) that have been provided by Citigroup Global Markets, Inc. to certain prospective purchasers of Ameriquest Mortgage Securities Inc., Asset-Backed Pass-Through Certificates, Series 2005-R4.

EXHIBIT 99.1

[FILED BY PAPER]

AMERIQUEST MORTGAGE SECURITIES INC 8-K