ECOL US Ecology Inc

As filed with the Securities and Exchange Commission on May 2, 2022

Registration No. 333-261704

Registration No. 333-234424

Registration No. 333-235835

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-261704

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-234424

POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-235835

UNDER

THE SECURITIES ACT OF 1933

AMENDED AND RESTATED US ECOLOGY, INC. OMNIBUS INCENTIVE PLAN

AMENDED AND RESTATED US ECOLOGY, INC. 2008 STOCK OPTION INCENTIVE PLAN

AMENDED AND RESTATED US ECOLOGY, INC. 2018 EQUITY AND INCENTIVE COMPENSATION PLAN

US ECOLOGY, INC. NONQUALIFIED DEFERRED COMPENSATION PLAN

(Full title of the plans)

Jeffrey R. Feeler

President and Chief Executive Officer

US Ecology, Inc.

101 S. Capitol Blvd., Suite 1000

Boise, Idaho 83702

(Name and address of agent for service)

(208) 331-8400

(Telephone number, including area code, of agent for service)

Copies to:

Stephen M. Leitzell, Esq.

Michael Darby, Esq.

Dechert LLP

Cira Centre

2929 Arch Street

Philadelphia, PA 19104

(215) 994-4000

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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 7(a)(2)(B) of the Securities Act. o

DEREGISTRATION OF SECURITIES

This Post-Effective Amendment relates to the following Registration Statements of US Ecology, Inc., a Delaware corporation (the “Company”), on Form S-8 (collectively, the “Registration Statements”):

On May 2, 2022 pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated as of February 8, 2022, by and among the Company, Republic Services, Inc. (“Republic Services”) and Bronco Acquisition Corp (“Merger Sub”), Merger Sub merged with and into the Company, with the Company continuing as the surviving company (the “Merger”). As a result of the Merger, the Company became a wholly-owned subsidiary of Republic Services.

In connection with the closing of the Merger, the Company has terminated any and all offerings of its securities pursuant to the Registration Statements. Accordingly, the Company hereby terminates the effectiveness of each Registration Statement and, in accordance with an undertaking made by the Company in Part II of each Registration Statement to remove from registration, by means of post-effective amendment, any securities that had been registered for issuance but remain unsold at the termination of the offering, removes from registration any and all securities of the Company registered but unsold under the Registrations Statements as of May 2, 2022.

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