|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, 2013                                                    
|or                                                                                             
|[    ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|For the transition period from _____________ to _____________                                  



|333-177354-04                             
|------------------------------------------
|(Commission File Number of issuing entity)



|UBS-Barclays Commercial Mortgage Trust 2012-C4            
|----------------------------------------------------------
|(Exact name of issuing entity as specified in its charter)



|UBS Commercial Mortgage Securitization Corp.         
|-----------------------------------------------------
|(Exact name of Depositor as specified in its charter)



|UBS Real Estate Securities Inc.                             
|------------------------------------------------------------
|Barclays Bank PLC                                           
|Natixis Real Estate Capital LLC                             
|General Electric Capital Corporation                        
|RAIT Partnership, L.P.                                      
|Redwood Commercial Mortgage Corporation                     
|(Exact names of the Sponsors as specified in their charters)



|46-1661720 / 46-1677972 / 46-1677972
|------------------------------------
|(I.R.S. Employer Identification No.)





|New York                                                                            
|------------------------------------------------------------------------------------
|(State or other jurisdiction of incorporation or organization of the issuing entity)



|c/o U.S. Bank, National Association as Certificate Administrator,
|-----------------------------------------------------------------
|1285 Avenue of the Americas                                      
|New York, New York                                               
|(Address of principal executive offices of issuing entity)       





|10019     
|----------
|(Zip Code)



|(212) 713-2000                                      
|----------------------------------------------------
|(Registrant's telephone number, including area code)



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



|Indicate by check mark  if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes [  ]    No [ X  ]
|------------------------------------------------------------------------------------------------------------------------------------------------------



|Note - Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Exchange Act from their obligations under those Sections.
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|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 [   ]
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                                      



|Indicate by check mark  if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) 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.   [ X ]
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                                                          



|Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer", "accelerated filer", and "smaller reporting company" in Rule 12b-2 of the Exchange Act.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Large accelerated filer [ ]                                                                                                                                                                                                                                                                         
|Non-accelerated filer [X]                                                                                                                                                                                                                                                                           



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



|State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                                                                                                        



|Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                                                                                                                                                        



|Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the last practicable date.
|-------------------------------------------------------------------------------------------------------------------------------
|                                                                                                                               



|DOCUMENTS INCORPORATED BY REFERENCE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated:  (1)Any annual report to security holders; (2) Any proxy or information statement; and (3)Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933.  The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980).
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         



|EXPLANATORY NOTE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|The Exhibit Index describes exhibits delivered by certain parties (in their capacities indicated on the Exhibit Index) with respect to the 1000 Harbor Boulevard Mortgage Loan, which constituted approximately 0.5% of the asset pool of the issuing entity as of its cut-off date. The 1000 Harbor Boulevard Mortgage Loan is an asset of the issuing entity and is part of a loan combination that includes the 1000 Harbor Boulevard Mortgage Loan and one other pari passu loan that is not an asset of the issuing entity. The other pari passu portion of this loan combination was securitized in the UBS-B 2012-C3 Mortgage Trust transaction, Commission File Number 333-177354-03 (the "UBS-B 2012-C3 Transaction"). This loan combination, including the 1000 Harbor Boulevard Mortgage Loan, is being serviced and administered pursuant to the pooling and servicing agreement for the UBS-B 2012-C3 Transaction, which is incorporated by reference as Exhibit 4.2 to this Annual Report on Form 10-K.



|Rialto Capital Advisors, LLC ("Rialto") is the special servicer of the mortgage loans serviced under the Pooling and Servicing Agreement and the special servicer of the 1000 Harbor Boulevard Mortgage Loan. These mortgage loans, in the aggregate, constituted more than 10% of the asset pool of the issuing entity as of its cut-off date. Thus, Rialto is a "servicer", as defined in Item 1108(a)(iii) of Regulation AB, with respect to these mortgage loans. The assessments of compliance with applicable servicing criteria, accountants' attestation reports and servicer compliance statements delivered by Rialto in the capacities described above are listed in the Exhibit Index.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|This Annual Report on Form 10-K includes assessments of compliance with applicable servicing criteria and accountant's attestation reports from CoreLogic Commercial Real Estate Services, Inc. and National Tax Search, LLC. These entities were engaged by the master servicer to remit tax payments received from the escrow accounts of borrowers to local taxing authorities, to report tax amounts due, to verify tax parcel information, and to verify non-escrow tax payments. These services are included within the servicing criteria set forth in Items 1122(d)(4)(xi) and 1122(d)(4)(xii). Therefore, under the principles-based definition of "servicer" set forth in Item 1101(j), these vendors are "servicers" for the purposes of Item 1122. See Manual of Publicly Available Telephone Interpretations, Section 3, Item 1101(j).
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------











|PART I
|------



|Item 1.  Business.
|------------------
|Omitted.          



|Item 1A.  Risk Factors.
|-----------------------
|Omitted.               



|Item 1B. Unresolved Staff Comments.
|-----------------------------------
|                                   



|Item 2. Properties.
|-------------------
|Omitted.           



|Item 3. Legal Proceedings.
|--------------------------
|Omitted.                  



|Item 4. Mine Safetly Disclosures.
|---------------------------------
|                                 







|PART II
|-------



|Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity
Securities.
|---------------------------------------------------------------------------------------------------------------------
|Omitted.                                                                                                             



|Item 6. Selected Financial Data.
|--------------------------------
|Omitted.                        



|Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operation.
|---------------------------------------------------------------------------------------------
|Omitted.                                                                                     



|Item 7A. Quantitative and Qualitative Disclosures About Market Risk.
|--------------------------------------------------------------------
|Omitted.                                                            



|Item 8. Financial Statements and Supplementary Data.
|----------------------------------------------------
|Omitted.                                            



|Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.
|---------------------------------------------------------------------------------------------
|Omitted.                                                                                     



|Item 9A. Controls and Procedures.
|---------------------------------
|Omitted.                         



|Item 9B. Other Information.
|---------------------------
|Omitted.                   











|PART III
|--------



|Item 10. Directors and Executive Officers and Corporate Governance.
|-------------------------------------------------------------------
|Omitted.                                                           



|Item 11. Executive Compensation.
|--------------------------------
|Omitted.                        



|Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.
|--------------------------------------------------------------------------------------------------------
|Omitted.                                                                                                



|Item 13. Certain Relationships and Related Transactions, and Director Independence.
|-----------------------------------------------------------------------------------
|Omitted.                                                                           



|Item 14. Principal Accounting Fees and Services.
|------------------------------------------------
|Omitted.                                        



|Additional Disclosure Items for Regulation AB
|---------------------------------------------



|Item 1112(b) of Regulation AB.                                                          | Significant Obligors of Pool Assets (Financial Information).
|--------------------------------------------------------------------------------------- | ------------------------------------------------------------
|No single obligor represents 10% or more of the pool assets held by the issuing entity.



|Item 1114(b)(2) of Regulation AB.                                                                                                                                                                   | Credit Enhancement and Other Support, Except for Certain
Derivatives Instruments (Information Regarding Significant
Enhancement Providers Financial Information).
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------
|No entity or group of affiliated entities provides any external credit enhancement or other support for the certificates within this transaction as described under Item 1114 (a) of Regulation AB.



|Item 1115(b) of Regulation AB.                                                                                                                                                             | Certain Derivatives Instruments (Financial Information).
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------
|No entity or group of affiliated entities provides any derivative instruments or other support for the certificates within this transaction as described under Item 1115 or Regulation AB.



|Item 1117 of Regulation AB.                                                                                                                                                                                                                                                                                                 | Legal Proceedings.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------
|The registrant knows of no material pending legal proceeding involving the trust or any party related to the trust, other than routine litigation incidental to the duties of those respective parties, and the following, with respect to UBS Real Estate Securities Inc ("UBSRES"), a sponsor and a mortgage loan seller:



|UBSRES is currently engaged in litigation with respect to various legacy residential mortgage-backed securities transactions. Some litigants are seeking the repurchase of mortgage loans by UBSRES from certain residential mortgage securitization trusts, on the basis that the loans are allegedly in breach of contractual representations and warranties in governing transaction documents. Other litigants are alleging violations of federal and/or state securities or common law for alleged misrepresentations and omissions in offering documents in connection with the issuance and/or distribution of residential mortgage-backed securities. No assurance can be given that one or more of the foregoing actions will not result in material liability to UBSRES.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Item 1119 of Regulation AB.                                                                                                                                                                         | Affiliations and Certain Relationships and Related Transactions.
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------
|The information regarding this item has been previously provided in a prospectus supplement of the registrant relating to the issuing entity filed on December 19, 2012 pursuant to Rule 424(b)(5).



|Item 1122 of Regulation AB.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Compliance with Applicable Servicing Criteria.
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------
|The reports on assessment of compliance with the servicing criteria for asset-backed securities and the related attestation reports on such assessments of compliance are attached hereto under Item 15. Attached as Schedule II to the Pooling and Servicing Agreement incorporated by reference as Exhibit 4.1 to this Annual Report on Form 10-K is a chart identifying the entities participating in a servicing function for the transaction responsible for each applicable servicing criterion set forth in Item 1122(d).



|The reports on assessments of compliance with the servicing criteria for asset-backed securities and related attestation reports on such assessments of compliance with respect to the 1000 Harbor Boulevard Mortgage Loan, which is being serviced and administered pursuant to the pooling and servicing agreement for the UBS-B 2012-C3 Transaction, are attached hereto as Exhibits 33.7 and 34.7 to this Annual Report on Form 10-K. Attached as Schedule II to the pooling and servicing agreement for the UBS-B 2012-C3 Transaction incorporated by reference as Exhibit 4.2 to this Annual Report on Form 10-K is a chart identifying the entities participating in a servicing function for the UBS-B 2012-C3 Transaction responsible for each applicable servicing criteria set forth in Item 1122(d).
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|The assessment of compliance with applicable servicing criteria for the twelve months ended December 31, 2013, furnished pursuant to Item 1122 of Regulation AB by National Tax Search, LLC (the "2013 NTS Assessment") for its commercial real estate mortgage loans platform, discloses that material instances of noncompliance occurred with respect to the servicing criterion described in Item 1122(d)(2)(vii) of Regulation AB. The 2013 NTS Assessment is attached to this Form 10-K as Exhibit 33.6. The material instances of noncompliance disclosed in the 2013 NTS Assessment are as follows:
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------









|Material Instances of Noncompliance by National Tax Search, LLC
|---------------------------------------------------------------



| | 1122(d)(2)(vii): Reconciliations are prepared on a monthly basis for all asset-backed securities
related to bank accounts, including custodial accounts and related clearing accounts. These
reconciliations (B) Are prepared within 30 calendar days after the bank statement cutoff date,
or such other number of days Specificied (sic) in the transaction agreement and (D) Contain
explanations for reconciling items. These reconciling items are resolved within 90 calendar
days of their original identification, or such other number of days specificied (sic) in
transaction agreements.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------















| | Noncompliance                                                                                                                                                                                                                                                                       
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | During the reporting period, certain reconciliations were not completed within 30 calendar days after the bank statement cutoff date. Certain reconciling items lacked proper explanations and were not resolved within 90 day (sic) calendar days of their original identification.









| | Remediation                                                                                                                                                                                                                                                                                                                   
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | Management corrected the timeliness of reconciliations within the Period and Plante Moran auditors have reviewed, under an agreed-upon procedures engagement, the compliance with the servicing criteria of section 1122(d)(2)(vii), attributes B & D, as defined above, as of January 31, 2014, noting no matters of concern.











| | In the first quarter of 2014 Management will also complete installation of a Treasury
Workstation system, which allows for the automation of daily reconciliation allowing
for review and research throughout the month instead of the days after a bank
statement cutoff date. This daily reconciliation will be accompanied by proper
explanation of all reconciling items. Management will review any items that require
resolution and reporting will provide aging of items at 30, 45 and 60 day levels to
prevent exceeding the 90 calendar day requirement.
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

















|Item 1123 of Regulation AB.                                                                     | Servicer Compliance Statement.
|----------------------------------------------------------------------------------------------- | ------------------------------
|The servicer compliance statements are attached as Exhibits to this Annual Report on Form 10-K.



|PART IV
|-------



|Item 15. Exhibits and Financial Statement Schedules.
|----------------------------------------------------



| | a) Exhibits       
| | ------------------
| | (1) Not applicable
| | (2) Not applicable
| | (3) See below     



|4.1 | Pooling and Servicing Agreement, dated as of December 1, 2012, among UBS
Commercial Mortgage Securitization Corp., as depositor, Wells Fargo Bank, National Association, as master servicer, Rialto Capital Advisors, LLC, as special servicer, TriMont Real Estate Advisors, Inc., as operating advisor, and U.S. Bank National Association, as trustee, certificate administrator, paying agent and custodian (filed as Exhibit 4 to the registrants Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)                                                                                          
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|4.2 | Pooling and Servicing Agreement, dated as of September 1, 2012, by and among UBS Commercial Mortgage Securitization Corp., as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer, Rialto Capital Advisors, LLC, as special servicer, Deutsche Bank Trust Company Americas, as trustee, certificate administrator, paying agent and custodian, and Park Bridge Lender Services LLC, as operating advisor (filed as Exhibit 4 to the registrants Current Report on Form 8-K, filed on September 27, 2012 in connection with the UBS-B 2012-C3 Transaction and incorporated by reference herein)





|31 | Rule 13a-14(d)/15d-14(d) Certification
|-- | --------------------------------------



|33 | Reports on Assessment of Compliance with Servicing Criteria for Asset-Backed Securities                              
|-- | ---------------------------------------------------------------------------------------------------------------------
|   | 33.1 Wells Fargo Bank, National Association, as Master Servicer                                                      
|   | 33.2 Rialto Capital Advisors, LLC, as Special Servicer                                                               
|   | 33.3 U.S. Bank National Association, as Trustee, Certificate Administrator and Custodian                             
|   | 33.4 TriMont Real Estate Advisors, Inc., as Operating Advisor                                                        
|   | 33.5 CoreLogic Commercial Real Estate Services, Inc., as Servicing Function Participant                              
|   | 33.6 National Tax Search, LLC, as Servicing Function Participant                                                     
|   | 33.7 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan (see Exhibit 33.2)









|34 | Attestation Reports on Assessment of Compliance with Servicing Criteria for Asset-Backed Securities                  
|-- | ---------------------------------------------------------------------------------------------------------------------
|   | 34.1 Wells Fargo Bank, National Association, as Master Servicer                                                      
|   | 34.2 Rialto Capital Advisors, LLC, as Special Servicer                                                               
|   | 34.3 U.S. Bank National Association, as Trustee, Certificate Administrator and Custodian                             
|   | 34.4 TriMont Real Estate Advisors, Inc., as Operating Advisor                                                        
|   | 34.5 CoreLogic Commercial Real Estate Services, Inc., as Servicing Function Participant                              
|   | 34.6 National Tax Search, LLC, as Servicing Function Participant                                                     
|   | 34.7 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan (see Exhibit 34.2)









|35 | Servicer Compliance Statement                                                                     
|-- | --------------------------------------------------------------------------------------------------
|   | 35.1 Wells Fargo Bank, National Association, as Master Servicer                                   
|   | 35.2 Rialto Capital Advisors, LLC, as Special Servicer                                            
|   | 35.3 U.S. Bank National Association, as Certificate Administrator                                 
|   | 35.4 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan





|99.1 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between UBS Real Estate Securities Inc. and UBS Commercial Mortgage Securitization Corp., pursuant to which UBS Real Estate Securities Inc. sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.1 to the registrant's Current Report on Form 8-K, filed on December,19, 2012 and incorporated by reference herein)
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|99.2 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between Barclays Bank PLC and UBS Commercial Mortgage Securitization Corp., pursuant to which Barclays Bank PLC sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.2 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|99.3 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between Natixis Real Estate Capital LLC and UBS Commercial Mortgage Securitization Corp., pursuant to which Natixis Real Estate Capital LLC sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.3 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|99.4 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between General Electric Capital Corporation and UBS Commercial Mortgage Securitization Corp., pursuant to which General Electric Capital Corporation sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.4 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|99.5 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between RAIT Partnership L.P. and UBS Commercial Mortgage Securitization Corp., pursuant to which RAIT Partnership L.P. sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.5 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|99.6 | Mortgage Loan Purchase Agreement, dated December 20, 2012, between Redwood Commercial Mortgage Corporation and UBS Commercial Mortgage Securitization Corp., pursuant to which Redwood Commercial Mortgage Corporation sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.6 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------





|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.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | UBS Commercial Mortgage Securitization Corp. | 
| | -------------------------------------------- | 
| | (Depositor)                                  | 



| | By: _________________                                         | 
| | ------------------------------------------------------------- | 
| | Name:  David Nass                                             | 
| | Title:  President and Chief Executive Officer                 | 
| | (senior officer in charge of securitization of the depositor) | 



| | Dated: March 31, 2014 | 
| | --------------------- | 



| | By: _________________      | 
| | -------------------------- | 
| | Name:  David Schell        | 
| | Title:  Executive Director | 



| |  |  | Dated: March 31, 2014 | 
| |  |  | --------------------- | 











|EXHIBIT INDEX
|-------------



|Exhibit | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|4.1     | Pooling and Servicing Agreement, dated as of December 1, 2012, among UBS
Commercial Mortgage Securitization Corp., as depositor, Wells Fargo Bank, National Association, as master servicer, Rialto Capital Advisors, LLC, as special servicer, TriMont Real Estate Advisors, Inc., as operating advisor, and U.S. Bank National Association, as trustee, certificate administrator, paying agent and custodian (filed as Exhibit 4 to the registrants Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)                                                                                          
|4.2     | Pooling and Servicing Agreement, dated as of September 1, 2012, by and among UBS Commercial Mortgage Securitization Corp., as depositor, Midland Loan Services, a Division of PNC Bank, National Association, as master servicer, Rialto Capital Advisors, LLC, as special servicer, Deutsche Bank Trust Company Americas, as trustee, certificate administrator, paying agent and custodian, and Park Bridge Lender Services LLC, as operating advisor (filed as Exhibit 4 to the registrants Current Report on Form 8-K, filed on September 27, 2012 in connection with the UBS-B 2012-C3 Transaction and incorporated by reference herein)



|31 | Rule 13a-14(d)/15d-14(d) Certification
|-- | --------------------------------------



|33 | Reports on Assessment of Compliance with Servicing Criteria for Asset-Backed Securities                              
|-- | ---------------------------------------------------------------------------------------------------------------------
|   | 33.1 Wells Fargo Bank, National Association, as Master Servicer                                                      
|   | 33.2 Rialto Capital Advisors, LLC, as Special Servicer                                                               
|   | 33.3 U.S. Bank National Association, as Trustee, Certificate Administrator and Custodian                             
|   | 33.4 TriMont Real Estate Advisors, Inc., as Operating Advisor                                                        
|   | 33.5 CoreLogic Commercial Real Estate Services, Inc., as Servicing Function Participant                              
|   | 33.6 National Tax Search, LLC, as Servicing Function Participant                                                     
|   | 33.7 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan (see Exhibit 33.2)









|34 | Attestation Reports on Assessment of Compliance with Servicing Criteria for Asset-Backed Securities                  
|-- | ---------------------------------------------------------------------------------------------------------------------
|   | 34.1 Wells Fargo Bank, National Association, as Master Servicer                                                      
|   | 34.2 Rialto Capital Advisors, LLC, as Special Servicer                                                               
|   | 34.3 U.S. Bank National Association, as Trustee, Certificate Administrator and Custodian                             
|   | 34.4 TriMont Real Estate Advisors, Inc., as Operating Advisor                                                        
|   | 34.5 CoreLogic Commercial Real Estate Services, Inc., as Servicing Function Participant                              
|   | 34.6 National Tax Search, LLC, as Servicing Function Participant                                                     
|   | 34.7 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan (see Exhibit 34.2)









|35 | Servicer Compliance Statement                                                                     
|-- | --------------------------------------------------------------------------------------------------
|   | 35.1 Wells Fargo Bank, National Association, as Master Servicer                                   
|   | 35.2 Rialto Capital Advisors, LLC, as Special Servicer                                            
|   | 35.3 U.S. Bank National Association, as Certificate Administrator                                 
|   | 35.4 Rialto Capital Advisors, LLC, as Special Servicer for the 1000 Harbor Boulevard Mortgage Loan



| | 99.1 Mortgage Loan Purchase Agreement, dated December 20, 2012, between UBS Real Estate Securities Inc. and UBS Commercial Mortgage Securitization Corp., pursuant to which UBS Real Estate Securities Inc. sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.1 to the registrant's Current Report on Form 8-K, filed on December,19, 2012 and incorporated by reference herein)
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 99.2 Mortgage Loan Purchase Agreement, dated December 20, 2012, between Barclays Bank PLC and UBS Commercial Mortgage Securitization Corp., pursuant to which Barclays Bank PLC sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.2 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 99.3 Mortgage Loan Purchase Agreement, dated December 20, 2012, between Natixis Real Estate Capital LLC and UBS Commercial Mortgage Securitization Corp., pursuant to which Natixis Real Estate Capital LLC sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.3 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 99.4 Mortgage Loan Purchase Agreement, dated December 20, 2012, between General Electric Capital Corporation and UBS Commercial Mortgage Securitization Corp., pursuant to which General Electric Capital Corporation sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.4 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 99.5 Mortgage Loan Purchase Agreement, dated December 20, 2012, between RAIT Partnership L.P. and UBS Commercial Mortgage Securitization Corp., pursuant to which RAIT Partnership L.P. sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.5 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 99.6 Mortgage Loan Purchase Agreement, dated December 20, 2012, between Redwood Commercial Mortgage Corporation and UBS Commercial Mortgage Securitization Corp., pursuant to which Redwood Commercial Mortgage Corporation sold certain mortgage loans to UBS Commercial Mortgage Securitization Corp. (filed as Exhibit 99.6 to the registrant's Current Report on Form 8-K, filed on December 19, 2012 and incorporated by reference herein)
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------