**Exhibit 4.13**

*Execution Version*

FOURTH AMENDMENT dated as of December 10, 2015 (this “Amendment”), to the CREDIT AGREEMENT dated as ofMay 7, 2014 (as previously amended by the First Amendment, dated as of December 5, 2014, the Second Amendment, dated as of February 5, 2015, and the Third Amendment, dated as of September 30, 2015, the “CreditAgreement”), among CONSTELLIUM N.V., a Dutch limited liability company registered under number 34393663, the LENDERS from time to time party thereto and DEUTSCHE BANK AG NEW YORK BRANCH, as Administrative Agent. 

WHEREAS the Lenders have agreed to extend credit to the Borrower under the Credit Agreement on the terms and subject to the conditions setforth therein; 

WHEREAS the Borrower has requested that the Credit Agreement be amended as set forth herein; and 

WHEREAS the parties hereto, which include the Required Lenders, are willing to amend the Credit Agreement on the terms and subject to theconditions set forth herein. 

NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuableconsideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto hereby agree as follows: 

SECTION 1.Defined Terms. Capitalized terms used but not otherwise defined herein (including in the preamble and the recitals hereto) have the meanings assigned to them in the Credit Agreement. 

SECTION 2. Fourth Amendment Effective Date Amendments. Effective as of the Fourth Amendment Effective Date, the Credit Agreement shallbe amended as follows: 

(a) Section 1.01 of the Credit Agreement shall be amended by adding the following new defined terms inappropriate alphabetical order: 

“Fourth Amendment” means the Fourth Amendment to this Agreement. 

“Fourth Amendment Effective Date” has the meaning assigned to such term in the Fourth Amendment. 

“FX Hedge Agreement” means any agreement with respect to any swap (including, but not limited to, cross currency basisswaps) or forward involving, or settled by reference to, one or more currencies. 

(b) Section 1.01 of the Credit Agreement shall be amended by amending and restating thedefined term “Consolidated Total Indebtedness” to read as follows: 

“Consolidated Total Indebtedness” means,as of any date of determination, the aggregate principal amount of consolidated funded Indebtedness for borrowed money (which, for the avoidance of doubt, shall not include any Indebtedness under the Factoring Facilities or any Qualified ReceivablesFinancing) of the Borrower and its Restricted Subsidiaries outstanding on such date; provided that to the extent that all or a portion of the principal amount of any such Indebtedness is subject to an FX Hedge Agreement with respect to the currencythereof, such Indebtedness (or portion thereof) shall be deemed to be the total amount (and in the currency) owed (or required to be delivered) by the Borrower or its Restricted Subsidiary, as the case may be, to the counterparty under theapplicable FX Hedge Agreement (prior to giving effect to any netting). 

SECTION 3. Representations and Warranties. In order toinduce the Lenders to enter into this Amendment and to amend the Credit Agreement in the manner provided herein, on and as of the Fourth Amendment Effective Date, the Borrower represents and warrants to the Lenders for itself and the Loan Partiesthat are its Subsidiaries that: 

(a) Each of the Loan Parties has the power and authority to execute, deliver and perform its obligationsunder this Amendment, the Credit Agreement, as amended by this Amendment (the “Amended Agreement”), and each of the other Loan Documents to which it is a party. 

(b) The execution, delivery and performance by each of the Loan Parties party to this Amendment, the Amended Agreement and each of the otherLoan Documents to which it is a party (a) have been duly authorized by all corporate, public limited company or limited liability company or partnership action required to be obtained by such Loan Party and (b) will not(i) (A) violate any provision of law, statute, rule or regulation, or of the Organizational Documents of such Loan Party, (B) violate any applicable order of any court or any rule, regulation or order of any Governmental Authority or(C) violate, be in conflict with, result in a breach of or constitute (alone or with notice or lapse of time or both) a default under, give rise to a right of or result in any cancellation or acceleration of any right or obligation (includingany payment) or to a loss of a material benefit under any indenture, certificate of designation for preferred stock, agreement or any other instrument to which such Loan Party is a party or by which any of them or their property is or may be bound,where any such conflict, violation, breach or default referred to in this clause (i) could reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect, or (ii) result in the creation or imposition of anyLien upon or with respect to any property or assets now owned or hereafter acquired by such Loan Party, other than the Liens created by the Loan Documents and Liens permitted by Section 6.06 of the Credit Agreement. 

(c) No action, consent or approval of, registration or filing with or any other action by any Governmental Authority is or will be required inconnection with the 

 
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execution, delivery and performance by each of the Loan Parties of this Amendment, the Amended Agreement and the other Loan Documents to which it is a party, except for (a) such as have beenmade or obtained and are in full force and effect, and (b) such other actions, consents, approvals, registrations or filings with respect to which the failure to be obtained or made could not reasonably be expected to have a Material AdverseEffect. 

(d) When this Amendment has been duly executed and delivered by the Borrower and each Loan Party that is a party hereto, thisAmendment and the Amended Agreement shall constitute a legal, valid and binding obligation of the Borrower and each such Loan Party, enforceable in accordance with its terms, subject to applicable bankruptcy, insolvency, reorganization, moratoriumor other laws affecting creditors’ rights generally and subject to general principles of equity, regardless of whether considered in a proceeding in equity or at law. 

(e) Before and after giving effect to this Amendment, the representations and warranties of the Loan Parties set forth in the Loan Documentsare true and correct in all material respects (in all respects in the case of representations and warranties qualified by materiality, Material Adverse Effect or similar language in the text thereof) on and as of the Fourth Amendment Effective Datewith the same effect as if made on and as of such date, except to the extent such representations and warranties expressly relate to an earlier date, in which case they were so true and correct as of such earlier date. 

(f) As of the Fourth Amendment Effective Date, before and after giving effect to this Amendment, no Default or Event of Default has occurredand is continuing or will result from the consummation of the transactions contemplated by this Amendment. 

SECTION 4.Effectiveness. This Amendment shall become a binding agreement of the parties hereto and the Amendments set forth in Section 2 shall become effective as of the first date on or after December 16, 2015 (the “Fourth AmendmentEffective Date”) on which (i) the Administrative Agent (or its counsel) shall have received duly executed counterparts hereof that, when taken together, bear the authorized signatures of the Borrower and the Required Lenders, and(ii) the Administrative Agent (or its counsel) shall have received a Reaffirmation Agreement, in form and substance satisfactory to the Administrative Agent, duly executed by each Subsidiary Loan Party, pursuant to which each Subsidiary LoanParty shall consent to the amendments effected by this Amendment and acknowledge that the Guarantee Agreement remains in full force and effect in accordance with its terms and constitutes a guarantee of the Loan Document Obligations as modified bythis Amendment. 

SECTION 5. Effect of this Amendment. (a) Except as expressly set forth herein, this Amendment shall not byimplication or otherwise limit, impair, constitute a waiver of, or otherwise affect the rights and remedies of the Agents or the Lenders under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affectany of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein

 
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shall be deemed to entitle any Loan Party to any other consent to, or any other waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants oragreements contained in the Credit Agreement or any other Loan Document in similar or different circumstances. 

(b) On and after theFourth Amendment Effective Date, each reference in the Credit Agreement to “this Agreement”, “herein”, “hereunder”, “hereto”, “hereof” and words of similar import shall, unless the context otherwiserequires, refer to the Credit Agreement as amended hereby, and each reference to the Credit Agreement in any other Loan Document shall be deemed to be a reference to the Credit Agreement as amended hereby. This Amendment shall constitute a“Loan Document” for all purposes of the Credit Agreement and the other Loan Documents. 

(c) This Amendment shall be binding uponand inure to the benefit of the Borrower and the other Loan Parties and each of their respective successors and assigns, and upon the Administrative Agent and the Lenders and their respective successors and assigns. 

SECTION 6. **Applicable Law; Jurisdiction.****(a) THIS AMENDMENT AND ALL CLAIMS OR CAUSES OF ACTION (WHETHER IN CONTRACT,TORT, OR OTHERWISE) THAT MAY BE BASED UPON, ARISE OUT OF OR RELATE IN ANY WAY TO THIS AMENDMENT, OR THE NEGOTIATION, EXECUTION OR PERFORMANCE OF THIS AMENDMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY, SHALL BE CONSTRUED IN ACCORDANCE WITH ANDGOVERNED BY THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO ANY PRINCIPLE OF CONFLICTS OF LAW THAT COULD REQUIRE THE APPLICATION OF ANY OTHER LAW.**

(b) Section 9.10(b) of the Credit Agreement will apply with like effect to this Amendment and any dispute arising hereunder. 

SECTION 7. Counterparts. This Amendment may be executed in counterparts (and by different parties hereto on different counterparts),each of which shall constitute an original but all of which, when taken together, shall constitute a single instrument. Delivery of an executed counterpart of a signature page of this Amendment by facsimile or other electronic transmission shall beeffective as delivery of a manually executed counterpart hereof. 

SECTION 8. Severability. Any provision of this Amendment that isprohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceabilityin any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction. 

SECTION 9. Fees andExpenses. The Borrower agrees to reimburse the Administrative Agent for its reasonable out-of-pocket expenses in connection with this Amendment, including the reasonable fees, charges and disbursements of Latham & Watkins LLP, counselfor the Administrative Agent. All fees shall be payable in immediately available funds and shall not be refundable. 

 
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**[*Signature Pages Follow*]**

 
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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by theirrespective authorized officers as of the date first above written. 

 
CONSTELLIUM N.V.  
/s/ Pierre Vareille
 
Name:  Pierre Vareille
 
Title:    CEO

 
[Fourth AmendmentSignature Page] 

DEUTSCHE BANK AG NEW YORK BRANCH, as Administrative Agent and Lender
/s/ Marcus M. Tarkington
Name:  Marcus M. TarkingtonTitle:    Director
/s/ Benjamin Souh
Name:  Benjamin SouhTitle:    Vice President
 
[Fourth AmendmentSignature Page] 

CONSENT TO FOURTH AMENDMENT
BNP PARIBAS,
as a Lender
/s/ Antoine Joly
Name:  Antoine JolyTitle:    Senior Banker
 

 
[Fourth AmendmentSignature Page] 

CONSENT TO FOURTH AMENDMENT
GOLDMAN SACHS BANK USA,
as a Lender
/s/ George Kevin
Name:  George Kevin Title:    Authorized Signatory
 
[Fourth AmendmentSignature Page] 

CONSENT TO FOURTH AMENDMENT
HSBC FRANCE SA,
as a Lender
/s/ Sophie Vaz
Name:  Sophie VazTitle:    Authorized Signatory
/s/ Philippe Abonneau
Name:  Philippe Abonneau
Title:    Head of Transaction

               Management Unit

 
[Fourth AmendmentSignature Page] 

CONSENT TO FOURTH AMENDMENT
SOCIETE GENERALE,
as a Lender
/s/ Patrick Sandray
Name:  Patrick Sandray 
Title:    Managing Director, Head of

               Leveraged Finance

 
[Fourth AmendmentSignature Page]