| 
             1. 
           | 
          
             NAMES OF REPORTING PERSONS 
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)  | 
        
| 
             683 Capital Management, LLC 
           | 
        |
| 
             2. 
           | 
          
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
           | 
        
| 
             (a)    [ ] 
           | 
        |
| 
             (b)    [ ] 
           | 
        |
| 
             3. 
           | 
          
             SEC USE ONLY 
           | 
        
| 
             4. 
           | 
          
             CITIZENSHIP OR PLACE OF ORGANIZATION 
           | 
        
| 
             Delaware 
           | 
        |
| 
             NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 
           | 
        |
| 
             5. 
           | 
          
             SOLE VOTING POWER 
           | 
        
| 
             0 
           | 
        |
| 
             6. 
           | 
          
             SHARED VOTING POWER 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             7. 
           | 
          
             SOLE DISPOSITIVE POWER 
           | 
        
| 
             0 
           | 
        |
| 
             8. 
           | 
          
             SHARED DISPOSITIVE POWER 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             9. 
           | 
          
             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             10. 
           | 
          
             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) 
          EXCLUDES CERTAIN SHARES [ ]  | 
        
| 
             11. 
           | 
          
             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 
           | 
        
| 
             6.2% 
           | 
        |
| 
             12. 
           | 
          
             TYPE OF REPORTING PERSON 
           | 
        
| 
             IA 
             | 
        |
| 
             1. 
           | 
          
             NAMES OF REPORTING PERSONS 
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)  | 
        
| 
             683 Capital Partners, LP 
           | 
        |
| 
             2. 
           | 
          
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
           | 
        
| 
             (a)    [ ] 
           | 
        |
| 
             (b)    [ ] 
           | 
        |
| 
             3. 
           | 
          
             SEC USE ONLY 
           | 
        
| 
             4. 
           | 
          
             CITIZENSHIP OR PLACE OF ORGANIZATION 
           | 
        
| 
             Delaware 
           | 
        |
| 
             NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 
           | 
        |
| 
             5. 
           | 
          
             SOLE VOTING POWER 
           | 
        
| 
             0 
           | 
        |
| 
             6. 
           | 
          
             SHARED VOTING POWER 
           | 
        
| 
             3,591,502* 
           | 
        |
| 
             7. 
           | 
          
             SOLE DISPOSITIVE POWER 
           | 
        
| 
             0 
           | 
        |
| 
             8. 
           | 
          
             SHARED DISPOSITIVE POWER 
           | 
        
| 
             3,591,502* 
           | 
        |
| 
             9. 
           | 
          
             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
           | 
        
| 
             3,591,502* 
           | 
        |
| 
             10. 
           | 
          
             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) 
          EXCLUDES CERTAIN SHARES [ ]  | 
        
| 
             11. 
           | 
          
             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 
           | 
        
| 
             6.0% 
           | 
        |
| 
             12. 
           | 
          
             TYPE OF REPORTING PERSON 
           | 
        
| 
             PN 
             | 
        |
| 
             1. 
           | 
          
             NAMES OF REPORTING PERSONS 
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)  | 
        
| 
             683 Maiden Fund LP 
           | 
        |
| 
             2. 
           | 
          
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
           | 
        
| 
             (a)    [ ] 
           | 
        |
| 
             (b)    [ ] 
           | 
        |
| 
             3. 
           | 
          
             SEC USE ONLY 
           | 
        
| 
             4. 
           | 
          
             CITIZENSHIP OR PLACE OF ORGANIZATION 
           | 
        
| 
             Delaware 
           | 
        |
| 
             NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 
           | 
        |
| 
             5. 
           | 
          
             SOLE VOTING POWER 
           | 
        
| 
             0 
           | 
        |
| 
             6. 
           | 
          
             SHARED VOTING POWER 
           | 
        
| 
             106,134 
           | 
        |
| 
             7. 
           | 
          
             SOLE DISPOSITIVE POWER 
           | 
        
| 
             0 
           | 
        |
| 
             8. 
           | 
          
             SHARED DISPOSITIVE POWER 
           | 
        
| 
             106,134 
           | 
        |
| 
             9. 
           | 
          
             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
           | 
        
| 
             106,134 
           | 
        |
| 
             10. 
           | 
          
             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) 
          EXCLUDES CERTAIN SHARES [ ]  | 
        
| 
             11. 
           | 
          
             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 
           | 
        
| 
             Less than 1% 
           | 
        |
| 
             12. 
           | 
          
             TYPE OF REPORTING PERSON 
           | 
        
| 
             PN 
           | 
        |
| 
             1. 
           | 
          
             NAMES OF REPORTING PERSONS 
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)  | 
        
| 
             Ari Zweiman 
           | 
        |
| 
             2. 
           | 
          
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
           | 
        
| 
             (a)    [ ] 
           | 
        |
| 
             (b)    [ ] 
           | 
        |
| 
             3. 
           | 
          
             SEC USE ONLY 
           | 
        
| 
             4. 
           | 
          
             CITIZENSHIP OR PLACE OF ORGANIZATION 
           | 
        
| 
             United States of America 
           | 
        |
| 
             NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 
           | 
        |
| 
             5. 
           | 
          
             SOLE VOTING POWER 
           | 
        
| 
             0 
           | 
        |
| 
             6. 
           | 
          
             SHARED VOTING POWER 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             7. 
           | 
          
             SOLE DISPOSITIVE POWER 
           | 
        
| 
             0 
           | 
        |
| 
             8. 
           | 
          
             SHARED DISPOSITIVE POWER 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             9. 
           | 
          
             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
           | 
        
| 
             3,697,636* 
           | 
        |
| 
             10. 
           | 
          
             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) 
          EXCLUDES CERTAIN SHARES [ ]  | 
        
| 
             11. 
           | 
          
             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 
           | 
        
| 
             6.2% 
           | 
        |
| 
             12. 
           | 
          
             TYPE OF REPORTING PERSON 
           | 
        
| 
             IN 
             | 
        |
| Item 1(a). | 
             Name of Issuer: 
           | 
        
| Item 1(b). | 
             Address of Issuer’s Principal Executive Offices: 
           | 
        
| Item 2(a). | 
             Name of Persons Filing: 
           | 
        
| 
               • 
             | 
            
               683 Capital Management, LLC, 
             | 
          
| 
               • 
             | 
            
               683 Capital Partners, LP, 
             | 
          
| 
               • 
             | 
            
               683 Maiden Fund LP, and 
             | 
          
| 
               • 
             | 
            
               Ari Zweiman. 
             | 
          
| Item 2(b). | 
             Address of Principal Business Office or, if None, Residence: 
           | 
        
| Item 2(c). | 
             Citizenship: 
           | 
        
| Item 2(d). | 
             Title of Class of Securities: 
           | 
        
| Item 2(e). | 
             CUSIP Number: 
           | 
        
| Item 3. | 
             If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a: 
           | 
        
| 
             (a) 
           | 
          
             [ ] 
           | 
          
             Broker or dealer registered under Section 15 of the Exchange Act. 
           | 
        |
| 
             (b) 
           | 
          
             [ ] 
           | 
          
             Bank as defined in Section 3(a)(6) of the Exchange Act. 
           | 
        |
| 
             (c) 
           | 
          
             [ ] 
           | 
          
             Insurance company defined in Section 3(a)(19) of the Exchange Act. 
           | 
        |
| 
             (d) 
           | 
          
             [ ] 
           | 
          
             Investment company registered under Section 8 of the Investment Company Act. 
           | 
        |
| 
             (e) 
           | 
          
             [ ] 
           | 
          
             Investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E). 
           | 
        |
| 
             (f) 
           | 
          
             [ ] 
           | 
          
             Employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F). 
           | 
        |
| 
             (g) 
           | 
          
             [ ] 
           | 
          
             Parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G). 
           | 
        |
| 
             (h) 
           | 
          
             [ ] 
           | 
          
             Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act. 
           | 
        |
| 
             (i) 
           | 
          
             [ ] 
           | 
          
             Church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; 
           | 
        |
| 
             (j) 
           | 
          
             [ ] 
           | 
          
             Non-U.S. institution in accordance with Section 240.13d-1(b)(1)(ii)(J). 
           | 
        |
| 
             (k) 
           | 
          
             [ ] 
           | 
          
             Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).  If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____ 
           | 
        
| (a) | 
             Amount beneficially owned: 
           | 
        
| (b) | 
             Percent of Class: 
           | 
        
| (c) | 
             Number of shares as to which such person has: 
           | 
        
| (i) | 
             Sole power to vote or to direct the vote of Class A Common Stock: 
           | 
        
| (ii) | 
             Shared power to vote or to direct the vote of Class A Common Stock: 
           | 
        
| (iii) | 
             Sole power to dispose or to direct the disposition of Class A Common Stock: 
           | 
        
| (iv) | 
             Shared power to dispose or to direct the disposition of Class A Common Stock: 
           | 
        
| Item 5. | 
             Ownership of Five Percent or Less of a Class. 
           | 
        
| Item 6. | 
             Ownership of More than Five Percent on Behalf of Another Person. 
           | 
        
| Item 7. | 
             Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. 
           | 
        
| Item 8. | 
             Identification and Classification of Members of the Group. 
           | 
        
| Item 9. | 
             Notice of Dissolution of Group. 
           | 
        
| Item 10. | 
             Certification. 
           | 
        
| 
             683 CAPITAL MANAGEMENT, LLC* 
           | 
          ||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          |
| 
             Ari Zweiman, 
           | 
          ||
| 
             Managing Member 
           | 
          ||
| 
             683 CAPITAL PARTNERS, LP* 
           | 
          |||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          ||
| 
             Ari Zweiman, 
           | 
          |||
| 
             Authorized Person 
           | 
          |||
| 
             683 MAIDEN FUND LP* 
            By: 683 Maiden Fund GP LLC, its General Partner 
            By: 683 Capital Management, LLC, its Sole Member 
           | 
          |||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          ||
| 
             Ari Zweiman, 
           | 
          |||
| 
             Managing Member 
           | 
          |||
| 
             /s/ Ari Zweiman 
           | 
          |
| 
             ARI ZWEIMAN* 
           | 
          
| 
             683 CAPITAL MANAGEMENT, LLC 
           | 
          ||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          |
| 
             Ari Zweiman, 
           | 
          ||
| 
             Managing Member 
           | 
          ||
| 
             683 CAPITAL PARTNERS, LP 
           | 
          |||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          ||
| 
             Ari Zweiman, 
           | 
          |||
| 
             Authorized Person 
           | 
          |||
| 
             683 MAIDEN FUND LP 
            By: 683 Maiden Fund GP LLC, its General Partner 
            By: 683 Capital Management, LLC, its Sole Member 
           | 
          |||
| 
             By: 
           | 
          
             /s/ Ari Zweiman 
           | 
          ||
| 
             Ari Zweiman, 
           | 
          |||
| 
             Managing Member 
           | 
          |||
| 
             /s/ Ari Zweiman 
           | 
          |
| 
             Ari Zweiman 
           |