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

December 22, 2005
Date of Report (date of earliest event reported)

WAMU ASSET ACCEPTANCE CORP.

as Depositor under a
Pooling and Servicing Agreement
dated as of December 1, 2005
providing for the issuance of

WaMu MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES 2005-AR18
(Exact name of Registrant as specified in its charter)

Delaware		333-123034		20-2258610
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

1201 THIRD AVENUE, WMT 1706A
SEATTLE, WASHINGTON 98101
(Address of principal executive offices and Zip Code)

Registrant's telephone number, including area code: (206) 554-8838

(Former name or former address, if changed since last report)

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

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

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

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

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

SECTION 9 FINANCIAL STATEMENTS AND EXHIBITS

Item 9.01. Financial Statements and Exhibits.

The following exhibits are filed herewith:

4.1	Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer, Deutsche Bank National Trust Company , as Trustee, and Deutsche Bank Trust Company Delaware, as Delaware Trustee, dated as of December 1, 2005.

4.6

Mortgage Loan Purchase Agreement, dated as of October 25, 2005, among WaMu Asset Acceptance Corp., Washington Mutual Bank and Washington Mutual Bank fsb (incorporated herein by reference from Exhibit 4.6 to the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on November 8, 2005 with respect to Registration Statement No. 333-123034).

99.1	Excerpt from Section 2 of the Term Sheet dated December 22, 2005 between Washington Mutual Bank, as seller, and WaMu Asset Acceptance Corp., as purchaser. See Exhibit B to Exhibit 4.6 for a form of Term Sheet.

The definition of Class Y Principal Reduction Amounts, included as Appendix 1 to the Pooling and Servicing Agreement, and the Mortgage Loan Schedule, included as Exhibit D to the Pooling and Servicing Agreement, have been intentionally omitted from this filing. Copies may be obtained from WaMu Asset Acceptance Corp. or Deutsche Bank National Trust Company by contacting:

in the case of WaMu Asset Acceptance Corp.,

        John Race
        WaMu Asset Acceptance Corp.
         c/o Washington Mutual Mortgage Securities Corp.
        75 N. Fairway Drive,VHF2A01
        Vernon Hills, IL 60061
        Telephone: (847) 549-3113
        Facsimile:     (847) 549-3680

in the case of Deutsche Bank National Trust Company,

        Alan Sueda
        Trust Administrator
        Deutsche Bank National Trust Company
        1761 E. St. Andrew Place
        Santa Ana, CA 92705
        Telephone:  (714) 247-6315
        Facsimile:    (714) 247-6329

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.


		WAMU ASSET ACCEPTANCE CORP.
Date: January 6, 2006	By:	/s/ David H. Zielke David H. Zielke First Vice President (Authorized Officer)

Exhibit Index

4.1	Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer, Deutsche Bank National Trust Company , as Trustee, and Deutsche Bank Trust Company Delaware, as Delaware Trustee, dated as of December 1, 2005.

4.6*

99.1	Excerpt from Section 2 of the Term Sheet dated December 22, 2005 between Washington Mutual Bank, as seller, and WaMu Asset Acceptance Corp., as purchaser. See Exhibit B to Exhibit 4.6 for a form of Term Sheet.

* Incorporated herein by reference from Exhibit 4.6 to the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on November 8, 2005 with respect to Registration Statement No. 333-123034.

WaMu Mortgage Pass-Through Certificates, Series 2005-AR18 8-K