**SECURITIES AND EXCHANGE COMMISSION****Washington, D.C.  20549****UNITED STATES****FORM 10-K****[ X ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934****[    ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934**(State or Other Jurisdiction(Telephone number, including area code)**Specialty Underwriting and Residential Finance Trust, Series 2007-AB1****New York**(I.R.S. Employer Identification No.)**04-3852607, 04-3852608, 04-3852609**(Commission file number of Issuing Entity) (Address of Principal Executive Offices)**St. Paul, MN****60 Livingston Avenue**(Zip Code)**55107****651-495-3849**Securities registered pursuant to Section 12(b) 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.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. For the fiscal year ended December 31, 2007orFor the transition period from _____________ to _____________(Exact name of Issuing Entity)Securities registered pursuant to Section 12(g) of the Act:**None.**Indicate by check mark  if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.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.                      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.Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).**[ Yes]**Documents incorporated by reference: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.**Not Applicable.****[X No]****[ Yes] [X No]****[X Yes] [ No]****[X]****[  Yes] [X No]****Large accelerated filer [ ]****Accelerated filer [ ]****Non-accelerated filer [X]**(Exact Name of Registrant as Specified in its Charter)(Exact Name of Sponsor as Specified in its Charter)**Merrill Lynch Mortgage Investors, Inc. (Depositor)****Merrill Lynch Mortgage Lending, Inc.****333-130545-50**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.**Not Applicable.**Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the last practicable date.**Not Applicable.**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).**None.****Smaller reporting company [ ]****c/o U.S. Bank National Association****PART I****Item 1. Business.****Item 1A. Risk Factors.****Item 1B. Unresolved Staff Comments.****Item 2. Properties.****Item 3. Legal Proceedings.****Item 4. Submission of Matters to a Vote of Security Holders.**Omitted.Omitted.Omitted.Omitted.Omitted.None.**Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.****Item 6. Selected Financial Data.****Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operation.****Item 7A. Quantitative and Qualitative Disclosures About Market  Risk.****Item 8. Financial Statements and Supplementary Data.****Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.****Item 9A. Controls and Procedures.****PART II**Omitted.Omitted.Omitted.Omitted.Omitted.Omitted.Omitted.None**Item 9B. Other Information.****Item 10. Directors and Executive Officers and Corporate Governance.****Item 11. Executive Compensation.****Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.****Item 13. Certain Relationships and Related Transactions, and Director Independence.****Item 14. Principal Accounting Fees and Services.****PART III**Omitted.Omitted.Omitted.Omitted.Omitted.**Item 1112(b) of Regulation AB.****Item 1117 of Regulation AB.****Item 1119 of Regulation AB.****Item 1122 of Regulation AB.****Servicer Compliance Statement.****Significant Obligors of Pool Assets (Financial Information).****Legal Proceedings.****Affiliations and Certain Relationships and Related Transactions.****Compliance with Applicable Servicing Criteria****Item 1123 of Regulation AB.**The registrant knows of no material pending legal proceedings involving the entities contemplated by Item 1117 of Regulation AB, other than routine litigation incidental to the duties of those respective parties.No single obligor represents 10% or more of the pool assets held by the issuing entity.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.The significance percentages of the derivative transactions entered into on behalf of the issuing entity are less than 10%.**Item 1115(b) of Regulation AB.**The information regarding this item has been previously filed in a 424(b)(5) filing dated March 26, 2007.See Item 15, exhibits (33) and (34).**Item 1114(b)(2) of Regulation AB.****Significant Enhancement Provider Financial Information.**See Item 15, exhibits (35).**Certain Derivatives Instruments (Financial Information).****SUBSTITUTE INFORMATION  PROVIDED IN ACCORDANCE WITH GENERAL INSTRUCTION J(2) TO FORM 10-K.****Item 15. Exhibits, Financial Statement Schedules.**b) See (a) abovec)  Not Applicable.**PART IV**a)   1.  Not Applicable.      2.  Not Applicable.      3.Pooling and Servicing Agreement, dated as of March 1, 2007, among Merrill Lynch Mortgage Investors, Inc., as Depositor, Wilshire Credit Corporation, as Servicer, and U.S. Bank National Association, as Trustee. (filed as an exhibit to Form 8-K on April 10, 2007)Mortgage Loan Sale and Assignment Agreement, dated as of March 1, 2007, between Merrill Lynch Mortgage Capital Inc., as Seller, and Merrill Lynch Mortgage Investors, Inc., as Purchaser. (filed as an exhibit to Form 8-K on April 10, 2007)  Exhibit 4.1Exhibit 10       Exhibit 33       Item 1122 Compliance with Applicable Servicing Criteria - Assessments       Exhibit 34       Item 1122 Compliance with Applicable Servicing Criteria - Attestations       Exhibit 35       Item 1123 Servicer Compliance Statement   Exhibit 31       302 Sarbanes-Oxley Certificationa) LandAmerica Tax and Flood Services, Inc., as Vendorb) U.S. Bank National Association, as Trustee and Custodianc) Wilshire Credit Corporation, as Servicerd) ZC Sterling Insurance Agency, Inc., as Vendora) LandAmerica Tax and Flood Services, Inc., as Vendorb) U.S. Bank National Association, as Trustee and Custodianc) Wilshire Credit Corporation, as Servicerd) ZC Sterling Insurance Agency, Inc., as Vendora) Wilshire Credit Corporation, as Servicer**SIGNATURES****March 27, 2008****/s/ Ken Frye****Ken FryeSenior Vice President, Loan Servicing**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.**Wilshire Credit Corporation, as Servicer****Specialty Underwriting and Residential Finance Trust, Series 2007-AB1****(Senior Officer in Charge of the Servicing Function)****Title:**By (Signature and Title):**Name:**Date**EXHIBIT INDEX**EXHIBIT DESCRIPTIONPooling and Servicing Agreement, dated as of March 1, 2007, among Merrill Lynch Mortgage Investors, Inc., as Depositor, Wilshire Credit Corporation, as Servicer, and U.S. Bank National Association, as Trustee. (filed as an exhibit to Form 8-K on April 10, 2007)      Exhibit 33       Item 1122 Compliance with Applicable Servicing Criteria - Assessments      Exhibit 34       Item 1122 Compliance with Applicable Servicing Criteria - Attestations      Exhibit 35       Item 1123 Servicer Compliance Statement      Exhibit 31       302 Sarbanes-Oxley CertificationMortgage Loan Sale and Assignment Agreement, dated as of March 1, 2007, between Merrill Lynch Mortgage Capital Inc., as Seller, and Merrill Lynch Mortgage Investors, Inc., as Purchaser. (filed as an exhibit to Form 8-K on April 10, 2007)      Exhibit 4.1       Exhibit 10.1a) LandAmerica Tax and Flood Services, Inc., as Vendorb) U.S. Bank National Association, as Trustee and Custodianc) Wilshire Credit Corporation, as Servicerd) ZC Sterling Insurance Agency, Inc., as Vendora) LandAmerica Tax and Flood Services, Inc., as Vendorb) U.S. Bank National Association, as Trustee and Custodianc) Wilshire Credit Corporation, as Servicerd) ZC Sterling Insurance Agency, Inc., as Vendora) Wilshire Credit Corporation, as Servicer