GUARANTY SUPPLEMENT

Exhibit 4.23

GUARANTY SUPPLEMENT

SUPPLEMENT, dated as of December 4, 2013 (this “Supplement”), to the Guaranty, dated as of March 31, 2011, among NEXEO SOLUTIONS HOLDINGS, LLC, a Delaware limited liability company (“Holdings”), NEXEO SOLUTIONS SUB HOLDING CORP., a Delaware corporation (“Sub Holdco”), the other Guarantors party thereto from time to time and BANK OF AMERICA, N.A., as Administrative Agent and Collateral Agent for the Secured Parties (as amended, restated, amended and restated, supplemented and/or otherwise modified from time to time, the “Guaranty”).

A.            Reference is made to the Credit Agreement, dated as of March 9, 2011 (as amended, restated, amended and restated, supplemented and/or otherwise modified from time to time, the “Credit Agreement”), among Nexeo Solutions, LLC, a Delaware limited liability company (the “Borrower”), Holdings, Sub Holdco, the Lenders party thereto from time to time, and Bank of America, N.A., as Administrative Agent and Collateral Agent for the Lenders.

B.            Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to such terms in the Credit Agreement and the Guaranty, as applicable.

C.            The Guarantors have entered into the Guaranty in order to induce the Lenders to make Loans to the Borrower. Section 4.13 of the Guaranty provides that additional Restricted Subsidiaries of the Guarantors may become Guarantors under the Guaranty by execution and delivery of an instrument in the form of this Supplement. Each undersigned Restricted Subsidiary (each, a “New Subsidiary” and, together, the “New Subsidiaries”) is executing this Supplement in accordance with the requirements of the Credit Agreement to become a Guarantor under the Guaranty as consideration for Loans previously made.

Accordingly, the Administrative Agent and each New Subsidiary agree as follows:

Section 1.              In accordance with Section 4.13 of the Guaranty, each New Subsidiary by its signature below becomes a Guarantor under the Guaranty with the same force and effect as if originally named therein as a Guarantor and such New Subsidiary hereby (a) agrees to all the terms and provisions of the Guaranty applicable to it as a Guarantor thereunder and (b) represents and warrants that the representations and warranties made by it as a Guarantor thereunder are true and correct on and as of the date hereof, provided that, to the extent that such representations and warranties specifically refer to an earlier date, they shall be true and correct in all respects as of such earlier date. Each reference to a “Guarantor” in the Guaranty shall be deemed to include each New Subsidiary as if originally named therein as a Guarantor. The Guaranty is hereby incorporated herein by reference.

Section 2.              Each New Subsidiary represents and warrants to the Administrative Agent and the other Secured Parties that this Supplement has been duly authorized, executed and delivered by it and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, except as such enforceability may be limited by Debtor Relief Laws and by general principles of equity.

Section 3.              This Supplement 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 contract. This Supplement shall become effective when the Administrative Agent shall have received a counterpart of this Supplement that bears the signature of each New Subsidiary and the Administrative Agent has executed a counterpart hereof. Delivery of an executed counterpart of a signature page of this Supplement by telecopy or other electronic imaging means shall be effective as delivery of a manually executed counterpart of this Supplement.

Section 4.              Except as expressly supplemented hereby, the Guaranty shall remain in full force and effect.

Section 5.

(a) THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

(b) EACH PARTY HERETO IRREVOCABLY AND UNCONDITIONALLY SUBMITS, FOR ITSELF AND ITS PROPERTY, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK SITTING IN NEW YORK CITY IN THE BOROUGH OF MANHATTAN AND OF THE UNITED STATES DISTRICT COURT OF THE SOUTHERN DISTRICT OF NEW YORK, AND ANY APPELLATE COURT FROM ANY THEREOF, IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT, OR FOR RECOGNITION OR ENFORCEMENT OF ANY JUDGMENT, AND EACH OF THE PARTIES HERETO IRREVOCABLY AND UNCONDITIONALLY AGREES THAT ALL CLAIMS IN RESPECT OF ANY SUCH ACTION OR PROCEEDING MAY BE HEARD AND DETERMINED IN SUCH NEW YORK STATE COURT OR, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN SUCH FEDERAL COURT. EACH OF THE PARTIES HERETO AGREES THAT A FINAL JUDGMENT IN ANY SUCH ACTION OR PROCEEDING SHALL BE CONCLUSIVE AND MAY BE ENFORCED IN OTHER JURISDICTIONS BY SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER PROVIDED BY LAW. EACH PARTY HERETO AGREES THAT THE ADMINISTRATIVE AGENT AND LENDERS RETAIN THE RIGHT TO SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO BRING PROCEEDINGS AGAINST ANY LOAN PARTY IN THE COURTS OF ANY OTHER JURISDICTION IN CONNECTION WITH THE EXERCISE OF ANY RIGHTS UNDER THIS AGREEMENT OR THE ENFORCEMENT OF ANY JUDGMENT.

(c) EACH PARTY HERETO IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT IN ANY COURT REFERRED TO IN PARAGRAPH (B) OF THIS SECTION. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE DEFENSE OF AN INCONVENIENT FORUM TO THE MAINTENANCE OF SUCH ACTION OR PROCEEDING IN ANY SUCH COURT.

(d) EACH PARTY HERETO HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE

TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PERSON HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PERSON WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

Section 6.              If any provision of this Supplement is held to be illegal, invalid or unenforceable, (a) the legality, validity and enforceability of the remaining provisions of this Supplement shall not be affected or impaired thereby and (b) the parties shall endeavor in good faith negotiations to replace the illegal, invalid or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the illegal, invalid or unenforceable provisions. The invalidity of a provision in a particular jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

Section 7.              All communications and notices hereunder shall be in writing and given as provided in Section 4.01 of the Guaranty.

Section 8.              Each New Subsidiary agrees to reimburse the Administrative Agent for its reasonable out-of-pocket expenses in connection with this Supplement as provided in Section 4.03(a) of the Guaranty.

IN WITNESS WHEREOF, each New Subsidiary and the Administrative Agent have duly executed this Supplement to the Guaranty as of the day and year first above written.

[Signature Page to Guaranty Supplement]

[Signature Page to Guaranty Supplement]