LabCorp Contacts: Envigo Contact: Media : Sue Maynard: +1 336-436-8263 Paul Surdez: +1 732-873-6682 Media@labcorp.com paul.surdez@envigo.com Investors: Clarissa Willett: +1 336-436-5076 Investor@lab

LABCORP AND ENVIGO SIGN INNOVATIVE AGREEMENT TO EXPAND

COVANCE S NONCLINICAL DRUG DEVELOPMENT CAPABILITIES AND

CREATE AN INDEPENDENT RESEARCH MODELS PROVIDER

BURLINGTON, N.C., and EAST MILLSTONE, N.J. April 17, 2019 LabCorp

(NYSE: LH), a leading global life sciences company that is deeply integrated in guiding patient care, and Envigo, a leading provider of nonclinical contract research services and research models, today announced that LabCorp s Covance Drug

Development segment will acquire Envigo s nonclinical research services business and Envigo s Research Models Services business will acquire the Covance Research Products business. This will result in Envigo becoming a pure-play research

models and services business, while Covance will expand its global nonclinical drug development capabilities.

This unique transaction is part of

our strategy to transform drug development, strengthening Covance s ability to offer comprehensive global nonclinical research services to the biopharma industry, said David P. King, chairman and CEO of LabCorp. Together, we are

taking a creative and collaborative approach to early-stage research, which demonstrates LabCorp s commitment to providing clients with innovative solutions that will ultimately improve health and improve lives.

This landmark agreement will provide an enhanced experience to our valued customers across both

segments of our company and closely aligns with our vision to work together to build a healthier and safer world, said Dr. Adrian Hardy, president and CEO of Envigo. We are excited to welcome the team members who will be joining our

expanded research models and services entity and for our colleagues who will become important contributors to one of the world s most innovative and respected contract research organizations. As a result of the multi-year strategic supply

collaboration, we look forward to partnering with our colleagues at Covance to advance critical, life-enhancing research.

The proposed transactions

are subject to labor consultations, regulatory approvals and customary closing conditions, and are expected to close within two months.

Enhances the reach and scope of Covance nonclinical development

Creates a comprehensive research models and

LabCorp Transaction Details

The proposed transactions

will result in net implied cash consideration to be paid by LabCorp of $485 million. The net impact of the proposed transactions will be an incremental $156 million in LabCorp s revenues on a pro forma 2018 basis. The proposed

transactions are expected to meet LabCorp s financial criteria of earnings and cash accretion in year one and exceeding the cost of capital by year three. LabCorp will provide an update on its first-quarter earnings call.

Goldman Sachs & Co. LLC is serving as

financial adviser to LabCorp. Hogan Lovells US LLP is serving as LabCorp s legal counsel. Wells Fargo Securities, LLC is serving as financial adviser to Envigo, and Cahill Gordon & Reindel LLP is serving as Envigo s legal counsel.

LabCorp (NYSE: LH), an S&P 500 company, is a leading global life sciences company that is deeply integrated in guiding patient care, providing

comprehensive clinical laboratory and end-to-end drug development services. With a mission to improve health and improve lives, LabCorp delivers world-class diagnostic

solutions, brings innovative medicines to patients faster, and uses technology to improve the delivery of care. LabCorp reported revenues of more than $11 billion in 2018. To learn more about LabCorp, visit www.LabCorp.com, and to learn

more about Covance Drug Development, visit www.Covance.com.

Envigo provides mission-critical products and research services for biopharmaceutical, crop protection, and chemical companies as well as universities,

governments, and other research organizations. Our company is founded on the principle that research partnerships depend on unmatched expertise, unwavering dedication to customer service and shared goals. We are committed to helping customers

realize the full potential of their research and products as we work together to build a healthier and safer world.

LabCorp Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the federal securities laws with respect to the proposed transaction

between LabCorp and Envigo, including statements regarding the benefits of the transaction, the anticipated timing of the transaction and the products and markets of each company. These forward-looking statements generally are identified by the

words believe, project, forecast, expect, anticipate, estimate, intend, strategy, future, opportunity, plan,

may, should, will, would, will be, will continue, will likely result, and similar expressions. Forward-looking statements are predictions, projections and other

statements about future events that are based on current expectations and assumptions and, as a result, are subject to risks and uncertainties. Actual results could differ materially from those suggested by the forward-looking statements in this

press release, due to factors including but not limited to: (i) the risk that the transaction may not be completed in a timely manner or at all, which may adversely affect LabCorp s business and the price of its common stock, (ii) the

failure to satisfy the conditions to the consummation of the transaction, including the receipt of certain governmental and regulatory approvals, (iii) the occurrence of any event, change or other circumstance that could give rise to the

termination of the transaction agreement, (iv) the effect of the announcement or pendency of the transaction on LabCorp s or Envigo s business relationships, operating results, and business generally, (v) risks that the proposed

transaction disrupts current plans and operations of Envigo or LabCorp and potential difficulties in affected employee retention as a result of the transaction, (vi) risks related to diverting management s attention from ongoing business

operations, (vii) the ability of LabCorp to successfully integrate Envigo s nonclinical contract research operations and product lines, (viii) the possibility that Envigo s nonclinical contract research services business will not

meet its projected financial results, (ix) the success of the strategic supply agreement between LabCorp and Envigo and (x) the ability of LabCorp to implement its plans, forecasts, and other expectations with respect to Envigo s

business after the completion of the proposed transaction. The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties that affect the businesses of LabCorp described in

the RISK FACTORS section of LabCorp s Annual Report on Form 10-K for the year ended December 31, 2018, subsequent Quarterly Reports on Form 10-Q, and in

LabCorp s other filings with the SEC. The information in this press release should be read in conjunction with a review of LabCorp s SEC filings including the information under the heading MANAGEMENT S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS in LabCorp s most recent Form 10-K and Form 10-Q. Forward-

looking statements speak only as of the date they are made. Readers are cautioned not to put undue

reliance on forward-looking statements, and LabCorp assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.