UNITED STATES



SECURITIES AND
EXCHANGE COMMISSION



Washington,
D.C. 20549



FORM 10-K



| | ☒ | ANNUAL
                                         REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934
| | - | ------------------------------------------------------------------------------------------------------------------------------



For
the fiscal year ended December 31, 2018



OR



| | ☐ | 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 of the issuing entity: 333-194765-06

CIK number of the issuing entity: 0001657146



AMERICREDIT
AUTOMOBILE RECEIVABLES TRUST 2015-4

(Exact
name of issuing entity as specified in its charter)



Commission
File Number of depositor: 333-194765

CIK number
of depositor: 0001347185



AFS
SENSUB CORP.

(Exact
name of depositor as specified in its charter)



Commission
File Number of sponsor: 001-13329

CIK
number of sponsor: 0001002761



AMERICREDIT
FINANCIAL SERVICES, INC.

(Exact
name of sponsor as specified in its charter)





|Delaware                            |  | 47-7309827             
|----------------------------------- |  | -----------------------
|(State or other jurisdiction
    of |  | (I.R.S. Employer       
|incorporation
    or organization)  |  | Identification
    No.)



|AmeriCredit
Financial Services, Inc. (as originator) |  |           
|---------------------------------------------------- |  | ----------
|801 Cherry
    Street, Suite 3500                    |  |           
|Fort
    Worth, TX                                   |  | 76102     
|(Address of principal
    executive offices)         |  | (Zip Code)



Registrant’s
telephone number, including area code (817) 302-7000



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 ☒



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 ☒



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
☒     No ☐



Indicate by check mark whether the
registrant has submitted electronically 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).



Yes ☒
     No ☐



Indicate by
check mark if the 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 the 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, a smaller reporting
company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,”
“smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.





|Large
    accelerated filer☐ | Accelerated
    filer☐        
|---------------------------- | ------------------------------
|Non-accelerated
    filer☒   | Smaller reporting
    company☐
|                             | Emerging growth
    company☐  



If an emerging
growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with
any new or revised financial accounting standards provided pursuant to Section 13(a) 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
☐      No ☒



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
to this registrant.
















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).



None.



PART I



The following
Items have been omitted in accordance with General Instruction J to Form 10-K:



| | ITEM 1. | BUSINESS
| | ------- | --------



| | ITEM 1A. | RISK
                                         FACTORS
| | -------- | -----------------------------------------------------



| | ITEM 2. | PROPERTIES
| | ------- | ----------



| | ITEM 3. | LEGAL
                                         PROCEEDINGS
| | ------- | ----------------------------------------------------------



| | ITEM 1B. | UNRESOLVED
                                         STAFF COMMENTS
| | -------- | ------------------------------------------------------------------



None.



| | ITEM 4. | MINE
                                         SAFETY DISCLOSURES
| | ------- | ----------------------------------------------------------------



Not Applicable.













PART II



The following
Items have been omitted in accordance with General Instruction J to Form 10-K:



| | ITEM 5. | MARKET
                                         FOR REGISTRANT’S COMMON EQUITY AND 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 OPERATIONS
| | ------- | ------------------------------------------------------------------------------------------------------------------------------



| | 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
| | -------- | ----------------------------------------------------------------



| | ITEM 9B. | OTHER
                                         INFORMATION
| | -------- | ----------------------------------------------------------



None.



PART III



The following
Items have been omitted in accordance with General Instruction J to Form 10-K:



| | ITEM 10. | DIRECTORS,
                                         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 IV



| | ITEM 15. | EXHIBITS
                                         AND FINANCIAL STATEMENT SCHEDULES
| | -------- | -----------------------------------------------------------------------------------



| | (a)(1) | Not
                                         Applicable
| | ------ | -------------------------------------------------------



| | (a)(2) | Not
                                         Applicable
| | ------ | -------------------------------------------------------



| | (a)(3) | As
                                         reported under clause (b)
| | ------ | ---------------------------------------------------------------------



(b)



|Exhibit Number |  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|-------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.1    |  | Indenture, dated as of November 4, 2015, between AmeriCredit Automobile Receivables Trust 2015-4 and The Bank of New York Mellon, as Trustee and Trust Collateral Agent (incorporated by reference from Exhibit 4.1 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                 
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.2    |  | Amended and Restated Trust Agreement, dated as of November 4, 2015, between AFS SenSub Corp., as Seller, and Wilmington Trust Company, as Owner Trustee (incorporated by reference from Exhibit 4.2 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                                 
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 4.3    |  | Sale and Servicing Agreement, dated as of November 4, 2015, among AmeriCredit Automobile Receivables Trust 2015-4, as Issuer, AmeriCredit Financial Services, Inc., as Servicer, AFS SenSub Corp., as Seller, and The Bank of New York Mellon, as Trust Collateral Agent (incorporated by reference from Exhibit 4.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.1   |  | Purchase Agreement, dated as of November 4, 2015, between AmeriCredit Financial Services, Inc., as Seller and AFS SenSub Corp., as Purchaser (incorporated by reference from Exhibit 10.1 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                                                           
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.2   |  | Lockbox Account Agreement, dated as of November 4, 2015, among JPMorgan Chase Bank, N.A., as Processor, AmeriCredit Financial Services, Inc., and The Bank of New York Mellon, as Trustee (incorporated by reference from Exhibit 10.2 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                              
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 10.3   |  | Lockbox Processing Agreement, dated as of November 4, 2015, among AmeriCredit Financial Services, Inc., The Bank of New York Mellon, as Trustee, and Regulus Group II LLC, as Processor (incorporated by reference from Exhibit 10.3 of the Current Report on Form 8-K filed by AmeriCredit Automobile Receivables Trust 2015-4 (File No. 333-194765-06) with the SEC on November 16, 2015).                                                                                
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 31.1   |  | Rule 13a-14(a)/15d-14(a) Certification (Section 302 Certification).                                                                                                                                                                                                                                                                                                                                                                                                         
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 33.1   |  | Management’s Assertion Regarding Compliance with Applicable Servicing Criteria concerning servicing activities of AmeriCredit Financial Services, Inc. and its subsidiaries for the year ended December 31, 2018.                                                                                                                                                                                                                                                           
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 33.2   |  | Assessment of Compliance with Applicable Servicing Criteria (The Bank of New York Mellon).                                                                                                                                                                                                                                                                                                                                                                                  
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 34.1   |  | Report of Independent Registered Public Accounting Firm (Ernst & Young LLP).                                                                                                                                                                                                                                                                                                                                                                                                
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 34.2   |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                                                                                                                                                                                                                                                                                         
|               |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Exhibit 35.1   |  | Servicer Compliance Statement of AmeriCredit Financial Services, Inc.                                                                                                                                                                                                                                                                                                                                                                                                       

















| | (c) | Not Applicable.
| | --- | ---------------



| | ITEM 16. | FORM
                                         10-K SUMMARY
| | -------- | ----------------------------------------------------------



None.



SUBSTITUTE
INFORMATION INCLUDED IN ACCORDANCE WITH GENERAL INSTRUCTION J TO FORM 10-K:



ITEM 1112(b)
OF REGULATION AB. (SIGNIFICANT OBLIGORS OF POOL ASSETS)



There is no
single obligor that represents more than 10% of the pool assets.



ITEM 1114(b)(2)
OF REGULATION AB. (CREDIT ENHANCEMENT AND OTHER SUPPORT, EXCEPT FOR CERTAIN DERIVATIVES INSTRUMENTS (FINANCIAL INFORMATION))



There
is no external credit enhancement or other support provider that is liable to provide payments supporting any notes or certificates
issued by the Issuing Entity.



ITEM 1115(b)
OF REGULATION AB. (CERTAIN DERIVATIVE INFORMATION (FINANCIAL INFORMATION))



No entity provides
any derivative instruments that are used to alter the payment characteristics of the cash flows from the Issuing Entity.



ITEM 1117
OF REGULATION AB. (LEGAL PROCEEDINGS)

The sponsor is subject to various
pending and potential legal and regulatory proceedings in the ordinary course of business, including litigation, arbitration,
claims, investigations, examinations, subpoenas and enforcement proceedings. Some litigation against the sponsor could take the
form of class actions. The outcomes of these proceedings are inherently uncertain, and thus no prediction can be confidently given
on how or when these proceedings will be resolved. An adverse outcome in one or more of these proceedings could result in substantial
damages, settlements, fines, penalties, diminished income or reputational harm to the sponsor, and could materially and adversely
affect the interest of the noteholders or the servicer’s ability to perform its duties under the transaction documents.
The proceedings identified below are those in connection with which the sponsor believes a material loss is reasonably possible
or probable.



In 2014 and 2015, General Motors
Financial Company, Inc. was served with investigative subpoenas from various state attorneys general and other governmental offices
to produce documents and data relating to its automobile loan and lease business and securitization of loans and leases. General
Motors Financial Company, Inc. believes that it has cooperated fully with all reasonable requests for information.



In the ordinary course of business, The Bank of New York Mellon is named as a defendant in or made a party
to pending and potential legal actions. In connection with its role as trustee of certain residential mortgage-backed securitization,
or RMBS, transactions, The Bank of New York Mellon has been named as a defendant in a number of legal actions brought by RMBS investors.
These lawsuits allege that the trustee had expansive duties under the governing agreements, including the duty to investigate and
pursue breach of representation and warranty claims against other parties to the RMBS transactions. While it is inherently difficult
to predict the eventual outcomes of pending actions, The Bank of New York Mellon denies liability and intends to defend the litigations
vigorously.











ITEM 1119
OF REGULATION AB. (AFFILIATIONS AND CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS)



Information
required by Item 1119 of Regulation AB has been omitted from this report on Form 10-K in reliance on the Instruction to Item
1119.



ITEM 1122 OF REGULATION AB. COMPLIANCE
WITH APPLICABLE SERVICING CRITERIA.



The
following documents are filed as part of this report.





|Exhibit Number |  | Description                                                                                                                                                                                                      
|-------------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|               |  |                                                                                                                                                                                                                  
|Exhibit 33.1   |  | Management’s Assertion Regarding Compliance with Applicable Servicing Criteria concerning servicing activities of AmeriCredit Financial Services, Inc. and its subsidiaries for the year ended December 31, 2018.
|               |  |                                                                                                                                                                                                                  
|Exhibit 33.2   |  | Assessment of Compliance with Applicable
    Servicing Criteria (The Bank of New York Mellon).                                                                                                                   
|               |  |                                                                                                                                                                                                                  
|Exhibit 34.1   |  | Report of Independent Registered Public Accounting Firm (Ernst & Young LLP).                                                                                                                                     
|               |  |                                                                                                                                                                                                                  
|Exhibit 34.2   |  | Report of Independent Registered Public Accounting Firm (KPMG LLP).                                                                                                                                              



The
Servicer has complied, in all material respects, with the Applicable Servicing Criteria.



ITEM 1123 OF REGULATION
AB, SERVICER COMPLIANCE STATEMENT



The
following documents are filed as part of this report.





|Exhibit
Number |  | Description                                                          
|-------------- |  | ---------------------------------------------------------------------
|               |  |                                                                      
|Exhibit 35.1   |  | Servicer Compliance Statement of AmeriCredit Financial Services, Inc.













SIGNATURES



Pursuant to
the requirements of Section 13 or 15 (d) of the Securities Exchange Act of 1934, AFS SenSub Corp. has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.





| | By: | AFS SENSUB CORP.,                                                                                          | 
| | --- | ---------------------------------------------------------------------------------------------------------- | 
| |     | as Depositor                                                                                               | 
| |     |                                                                                                            | 
| | By: | /s/ Susan B. Sheffield                                                                                     | 
| |     | Name:
Susan B. SheffieldTitle:
  Executive Vice President and Chief Financial Officer
Dated: March 8,
2019 | 



Supplemental information to be
Furnished With Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant
to Section 12 of the Act.



No annual report,
proxy statement, form of proxy or other proxy soliciting material has been sent to certificateholders, and the registrant does
not presently contemplate sending any such materials subsequent to the filing of this report.