UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form SD

Specialized Disclosure Report

LABORATORY CORPORATION OF AMERICA

HOLDINGS

(Exact Name of Registrant as Specified in Charter)

Tiana Gibson Ayotte, Senior Vice President & Deputy Chief Compliance Officer, 336-436-5010

(Name and telephone number, including area code, of the person to contact in connection with this report.)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1 – Conflict Minerals Disclosure

Conflict Minerals Disclosure

This Form SD of Laboratory Corporation of America^® Holdings and its consolidated subsidiaries (the “Company”) is filed pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended (the “Rule”), for the year ended December 31, 2018.

The Rule requires disclosure of certain information when a company manufactures, or contracts to manufacture, products for which minerals specified in the Rule are necessary to the functionality or production of those products. The specified minerals are cassiterite, columbite-tantalite, wolframite and gold, including their derivatives, which are limited to tin, tantalum and tungsten (“3TG”). The “Covered Countries” for the purposes of the Rule are the Democratic Republic of the Congo, the Republic of the Congo, the Central African Republic, South Sudan, Uganda, Rwanda, Burundi, Tanzania, Zambia and Angola.

The Company determined that in the period beginning January 1, 2018 through December 31, 2018, the Company manufactured, or contracted to manufacture, a product for which 3TG are necessary to the functionality or production of the product. As a result of this determination, the Company conducted a good faith reasonable country of origin inquiry (the “RCOI”) regarding the 3TG in its product. The RCOI was reasonably designed to determine whether the 3TG found in the product originated in the Covered Countries or are from recycled or scrap sources. Based on the RCOI, the Company determined that it has no reason to believe that the necessary 3TG used in its product may have originated in the Covered Countries.

The elements of the Company’s RCOI were: the identification of the suppliers of the 3TG contained in the product; data collection; and the assessment to determine whether further due diligence was required.

The responses that the Company received from the Covered Suppliers indicated that there was no reason to believe that the 3TG supplied to the Company originated in the Covered Countries.

Based on the data collected by the Company through the RCOI, the Company has no reason to believe that the necessary 3TG used in its product manufactured between January 1, 2018 and December 31, 2018 may have originated in the Covered Countries. Accordingly, the Company determined that no additional due diligence measures were required to be taken.

This information is publicly available at: http://phx.corporate-ir.net/External.File?item=UGFyZW50SUQ9NDE5NTE1fENoaWxkSUQ9LTF8VHlwZT0z&t=1&cb=636934403013087594.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.