WaMu Mortgage Pass-Through Certificates, Series 2005-AR16 – ‘10-K’ for 12/31/05

On:  Thursday, 3/30/06, at 4:24pm ET   ·   For:  12/31/05   ·   Accession #:  1277277-6-348   ·   File #:  333-123034-04

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Annual Report   —   Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                          2     15K 
 2: EX-31       Certification per Sarbanes-Oxley Act (Section 302)     1      6K 
 3: EX-99.1     Miscellaneous Exhibit                                  1      5K 

10-K   —   Annual Report
Document Table of Contents

10-K
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 UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 Form 10-K

[X]  Annual report pursuant to Section 13 or 15(d) of the Securities Exchange   
Act of 1934 for the fiscal year ended December 31, 2005               

[    ] Transition report pursuant to Section 13 or 15(d) of the Securities      
Exchange Act of 1934                                                  

for the transition period from       to                               

Commission File Number 333-123034-04                

 WAMU ASSET ACCEPTANCE CORP.
(Exact name of Registrant as specified in its charter)

Delaware                            20-2258610        
(State or other jurisdiction of    (I.R.S. Employer Identification No.)       
incorporation                                               

1201 THIRD AVENUE, WMT 1706A
 SEATTLE, WASHINGTON 98101
(206) 554-8838
(Address, including zip code, and telephone number, including area
code, of registrant's principal executive offices)

WaMu Mortgage Pass-Through Certificates, Series 2005-AR16 

--------------------------------------------------------------------- 
(Title of each class of securities covered by this Form)

Indicate by checkmark if the  registrant  is a well-known  seasoned  issuer,  as
defined in Rule 405 of the Securities Act: Yes [ ] No [X]                       

Indicate by checkmark if the registrant not required to file reports pursuant to
to Section 13 or Section 15(d) of the Act: Yes [ ] No [X]                       

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 [ ] (as such reporting     
obligations are modified as set forth in J.P. Morgan Mortgage Pass-Through      
Corporation, SEC No-Action Letter, March 31, 1989, in reliance upon which the   
registrant is filing this modified report).                                     

    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements   
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ] Not applicable.                                                  

     Indicate by checkmark whether the registrant is a large accelerated
filer, or a non-accelerated filer. See definition of "accelerated filer and     
large accelerated filer" in Rule 12b-2 of the Exchange Act. (Check one):        

Large Accelerated Filer [  ]                                                    
Accelerated Filer [  ]                                                          
Non-accelerated Filer [X]                                                       

     Indicate by checkmark whether the registrant is a shell company (as defined
in Rule 12B-2 of the Act). [ ] Yes [X] No                                       

     State the aggregate market value of the voting and non-voting common equity
held by non-affiliates of the registrant: None.                                 

Indicate the number of shares outstanding of each of the registrant's 
classes of common stock, as of the latest practicable date: Not applicable.     

 DOCUMENTS INCORPORATED BY REFERENCE

The registrant's Reports on Form 8-K concerning the registrant's WaMu Mortgage  
Pass-Through Certificates, Series 2005-AR16 issued pursuant to the Pooling and  
Servicing Agreement dated as of November 1, 2005(the "Pooling Agreement") and   
registered pursuant to a registration statement on Form S-3 (File No.           
333-123034) (such mortgage pass-through certificates, the "Certificates"), are  
incorporated by reference as set forth in Part IV, Item 15. Capitalized terms   
used herein but not otherwise defined shall have the meanings assigned to them  
in the Pooling Agreement.                                                       

 Part IV

Item 15. Exhibits and Financial Statement Schedules                             

(a) Documents filed as part of this report.                                     

1. Not applicable.                                                    

2. Not applicable.                                                    

3. Not applicable.                                                    

(b) Exhibits required by Item 601                                               

Exhibit No.   Description                                                       

31            Rule 13a-14(d) Certification                                      

99.1          Officer's Certificate regarding                                   
Annual Statement of Compliance of                   
Washington Mutual Bank, dated March 1, 2006         

99.2          Report of Independent Registered Public Accounting Firm           
on Management's Assertion Concerning Compliance with
          Washington Mutual Bank's Minimum Servicing Standards as of and
           for the year ended December 31, 2005 (incorporated by reference
  to the designated exhibit included in the registrant's
Current Report on Form 8-K, filed on March 30, 2006,
(SEC File No. 333-123034))                          

The registrant filed Current Reports on Form 8-K that described       
distributions made to Certificateholders on the Distribution Date occurring in  
the month preceding the month in which such Current Report on Form 8-K was filed
and also provided certain information regarding delinquent Mortgage Loans and   
credit enhancements as of such Distribution Date. Such Current Reports on Form  
8-K are incorporated by reference herein, as follows:                           

WaMu Mortgage Pass-Through Certificates, Series                                 
2005-AR16                                                                       

EVENT REPORTED                                                                  
Monthly Distribution Report sent to                                             
holders of the Certificates for           Date Distribution Report              
payments made in:                         Filed on Form 8-K:                    
-----------------                         ------------------                    

12/27/2005                                12/29/2005                            

10-K
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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) 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:  March 30, 2006      WAMU ASSET ACCEPTANCE CORP.                         

 By: /s/ Thomas G. Lehmann
                     -------------------------------------
Thomas G. Lehmann,
    First Vice President

Dates Referenced Herein   and   Documents Incorporated by Reference

				Referenced-On Page
This ‘10-K’ Filing		Date		First		Last			Other Filings
Filed on:		3/30/06		1		2			None on these Dates
		3/1/06		1
For Period End:		12/31/05		1
		11/1/05		1
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