UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No.  )

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Filed by a Party other than the Registrant   x

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o           Preliminary Proxy Statement

¨           Confidential, for Use of the Commission Only (as permitted by Rule14a-6(e)(2))

¨           Definitive Proxy Statement

x          Definitive Additional Materials

o           Soliciting Material Under Rule 14a-12

CASELLA WASTE SYSTEMS, INC.

(Name of Registrant as Specified in Its Charter)

JCP INVESTMENT PARTNERSHIP, LP

JCP SINGLE-ASSET PARTNERSHIP, LP

JCP INVESTMENT PARTNERS, LP

JCP INVESTMENT HOLDINGS, LLC

JCP INVESTMENT MANAGEMENT, LLC

JAMES C. PAPPAS

BRETT W. FRAZIER

(Name of Persons(s) Filing Proxy Statement, if Other Than the Registrant)

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x          No fee required.

¨           Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

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(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

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¨           Fee paid previously with preliminary materials:

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JCP Investment Management, LLC, together with the other participants named herein (collectively, “JCP Investment Management”), has filed a definitive proxy statement with the Securities and Exchange Commission and an accompanying GOLD proxy card to be used to solicit votes for the election of JCP Investment Management’s slate of two highly-qualified director nominees to the Board of Directors of Casella Waste Systems, Inc., a Delaware corporation (the “Company”), at the Company’s upcoming 2015 annual meeting of stockholders, or any other meeting of stockholders held in lieu thereof, and any adjournments, postponements, reschedulings or continuations thereof.

On October 19, 2015, JCP Investment Management issued an Investor Presentation, which is attached as Exhibit 1.