Document:

EX-4.1

 Exhibit 4.1 

FIRST SUPPLEMENTAL INDENTURE 

First Supplemental Indenture (this “Supplemental Indenture”), dated as of June 1, 2015, among A. Schulman, Inc., a
Delaware corporation (the “Issuer”), each of the subsidiaries of the Issuer listed on Annex A hereto (each a “Guaranteeing Subsidiary” and collectively the “Guaranteeing Subsidiaries) and U.S. Bank
National Association, as trustee (the “Trustee”). 
 W I T N E S S E T H 

WHEREAS, each of the Issuer and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the
Trustee an indenture (the “Indenture”), dated as of May 26, 2015, providing for the issuance of an unlimited aggregate principal amount of 6.875% Senior Notes due 2023 (the “Notes”); 

WHEREAS, pursuant to Section 10.1 of the Indenture, the Issuer has notified the Trustee that each Guaranteeing Subsidiary shall become a
Guarantor and execute and deliver to the Trustee a supplemental indenture pursuant to which each Guaranteeing Subsidiary shall unconditionally Guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and
conditions set forth herein and under the Indenture; 
 WHEREAS, each Guaranteeing Subsidiary has duly authorized the execution and delivery
of this Supplemental Indenture to provide its Note Guarantee in accordance with Article 10.1 of the Indenture and all things necessary to make this Supplemental Indenture, the Indenture, and the Note Guarantee of each Guaranteeing Subsidiary valid
and binding agreements of each Guaranteeing Subsidiary, in accordance with the terms thereof, have been done; and 
 WHEREAS, the Issuer has
provided to the Trustee such documents as are required to be provided to it under Section 10.1 of the Indenture, has requested the Trustee to join with it and each Guaranteeing Subsidiary in the execution and delivery of this Supplemental
Indenture, and pursuant to Section 10.1 of the Indenture, the Issuer, the Guaranteeing Subsidiaries, and the Trustee are authorized to execute and deliver this Supplemental Indenture. 

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged,
the parties mutually covenant and agree for the benefit of each other and the equal and ratable benefit of the Holders as follows: 
 1.
Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 
 2.
Guarantor. Each Guaranteeing Subsidiary hereby agrees to be a Guarantor under this Indenture, to provide an unconditional Note Guarantee on the terms and subject to the conditions set forth in the Indenture and to be bound by the terms of the
Indenture applicable to Guarantors, including Article 10 thereof. The Obligations of each Guarantor under its Note Guarantee shall be limited to the extent necessary to ensure that it does not constitute a fraudulent conveyance or fraudulent
transfer under applicable law. 
 3. Execution and Delivery. Each Guaranteeing Subsidiary agrees that the Note Guarantee shall remain
in full force and effect notwithstanding the absence of the endorsement of any notation of such Note Guarantee on the Notes. 

  
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 4. Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 6. Waiver of Jury Trial. EACH OF THE ISSUER, THE GUARANTEEING SUBSIDIARIES AND
THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE, THE INDENTURE, THE NOTES, THE NOTE
GUARANTEE OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY. 
 7. Counterparts. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or portable document format
(“PDF”) transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties
hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. 
 8. Headings. The headings
of the Sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part of this Supplemental Indenture and shall in no way modify or restrict any of the terms or provisions hereof. 

9. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this
Supplemental Indenture, the Note Guarantee of each Guaranteeing Subsidiary or for or in respect of the recitals contained herein, all of which recitals are made solely by the Issuer and the Guaranteeing Subsidiaries. All of the provisions contained
in the Indenture in respect of the rights, privileges, immunities, powers, and duties of the Trustee shall be applicable in respect of this Supplemental Indenture as fully and with like force and effect as though fully set forth in full herein. 

  
 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed, all as of the date first above written. 
  

					
	A. SCHULMAN, INC.
		
	By: 		 /s/ David C. Minc

			Name: 		David C. Minc
			Title:		Vice President, Chief Legal Officer and Secretary
	
	HGGC CITADEL PLASTICS HOLDINGS, INC.
		
	By:		 /s/ David C. Minc

			Name: 		David C. Minc
			Title:		Secretary
	
	HGGC CITADEL PLASTICS INTERMEDIATE HOLDINGS, INC.
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	CITADEL PLASTICS HOLDINGS, INC.
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	CITADEL INTERMEDIATE HOLDINGS, LLC
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	THE MATRIXX GROUP, INCORPORATED
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	BULK MOLDING COMPOUNDS, INC.
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary

  
 [Signature Page to
Supplemental Indenture] 

					
	HPC HOLDINGS, LLC
		
	By: 		 /s/ David C. Minc

			Name: 		David C. Minc
			Title:		Secretary

  
 [Signature Page to
Supplemental Indenture] 

 
					
	U.S. BANK NATIONAL ASSOCIATION, as Trustee
		
	By: 		 /s/ Holly H. Pattison

			Name: 		Holly H. Pattison
			Title:		Vice President

 Annex A 

HGGC Citadel Plastics Holdings, Inc., a Delaware corporation 

HGGC Citadel Plastics Intermediate Holdings, Inc., a Delaware corporation 

Citadel Plastics Holdings, Inc., a Delaware corporation 

Citadel Intermediate Holdings, LLC, a Delaware limited liability company 

The Matrixx Group, Incorporated, an Indiana corporation 
 Bulk
Molding Compounds, Inc., an Illinois corporation 
 HPC Holdings, LLC, a Delaware limited liability companyEX-4.2

 Exhibit 4.2 

JOINDER AGREEMENT 
 June 1, 2015 

Merrill Lynch, Pierce, Fenner & Smith 

                     Incorporated 

J.P. Morgan Securities LLC 
 As Representatives
of the several Initial Purchasers 
 c/o Merrill Lynch, Pierce, Fenner & Smith 

         Incorporated 

One Bryant Park 
 New York, New York 10036 

c/o J.P. Morgan Securities LLC 
 383 Madison Avenue 

New York, New York 10179 
 Reference is made to
that registration rights agreement (the “Registration Rights Agreement”) dated as of May 26, 2015 among A. Schulman, Inc., a Delaware corporation (the “Company”), the Schulman Guarantors, Merrill Lynch,
Pierce, Fenner & Smith and J.P. Morgan Securities LLC, as the Representatives, relating to the issuance and sale to the Initial Purchasers of $375,000,000 aggregate principal amount of the Company’s 6.875% Senior Notes due 2023
(the “Notes”). Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to such terms in the Registration Rights Agreement. 

The Registration Rights Agreement contemplates that substantially concurrently with the consummation of the Acquisition, HGGC Citadel Plastics
Holdings, Inc. and each of its subsidiaries that guarantee the Notes will becomes parties to the Registration Rights Agreement by executing this Registration Rights Joinder. 

1. Joinder. Each of the undersigned hereby acknowledges that it has received and reviewed a copy of the Registration Rights Agreement
and all other documents it requires to enter into this Joinder Agreement (the “Registration Rights Joinder”), and acknowledges and agrees to (i) join and become a party to the Registration Rights Agreement as indicated by its
signature below; (ii) be bound by all covenants, agreements, representations, warranties and acknowledgements attributable to a Guarantor in the Registration Rights Agreement as if made by, and with respect to, each Guarantor signatory hereto;
and (iii) perform all obligations and duties required of a Guarantor pursuant to the Registration Rights Agreement. 
 2.
Counterparts. This Registration Rights Joinder may be signed in one or more counterparts (which may be delivered in original form or facsimile or “pdf” file thereof), each of which shall constitute an original when so executed and
all of which together shall constitute one and the same agreement. 

  
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 3. Amendments. No amendment or waiver of any provision of this Registration Rights
Joinder, nor any consent or approval to any departure therefrom, shall in any event be effective unless the same shall be in writing and signed by the parties thereto. 

4. Headings. The section headings used herein are for convenience only and shall not affect the construction hereof. 

5. APPLICABLE LAW. THIS REGISTRATION RIGHTS JOINDER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW
YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW RULES THEREOF. 

  
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 IN WITNESS WHEREOF, each of the undersigned has caused this Registration Rights Joinder to be
duly executed and delivered, by its proper and duly authorized officer as of the date set forth above. 
  

					
	HGGC CITADEL PLASTICS HOLDINGS, INC.
		
	By: 		 /s/ David C. Minc

			Name: 		David C. Minc
			Title:		Secretary
	
	HGGC CITADEL PLASTICS INTERMEDIATE HOLDINGS, INC.
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	CITADEL PLASTICS HOLDINGS, INC.
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	CITADEL INTERMEDIATE HOLDINGS, LLC
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary
	
	THE MATRIXX GROUP, INCORPORATED
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary

  
 [Signature Page to
Joinder to Registration Rights Agreement] 

 
					
	BULK MOLDING COMPOUNDS, INC.
		
	By: 		 /s/ David C. Minc

			Name: 		David C. Minc
			Title:		Secretary
	
	HPC HOLDINGS, LLC
		
	By:		 /s/ David C. Minc

			Name:		David C. Minc
			Title:		Secretary

  
 [Signature Page to
Joinder to Registration Rights Agreement]

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