Roche (RHHVF) SC TO-C Information about tender offer

Exhibit 99.1

Media & Investor Release

Roche signs definitive merger agreement with GenMark Diagnostics, Inc., to access novel technology to test for broad range of pathogens with one patient sample

• Roche to acquire GenMark Diagnostics for US$ 24.05 per share with the expectation to close in the 2^nd quarter of 2021

• GenMark provides molecular diagnostic tests that are designed to detect multiple pathogens from a single patient sample

• GenMark’s ePlex platform delivers rapid and actionable results so clinicians can determine the cause of infection and the most effective treatment, potentially saving lives and alleviating the healthcare burden. The addition of GenMark’s proprietary multiplex technology complements Roche’s diagnostic offering, addressing a broad range of infectious disease testing needs, including respiratory and bloodstream infections

Basel, 15 March 2021 - Roche (SIX: RO, ROG; OTCQX: RHHBY) and GenMark Diagnostics (NASDAQ: GNMK) today announced that they have entered into a definitive merger agreement for Roche to fully acquire GenMark at a price of US$ 24.05 per share in an all-cash transaction. This corresponds to a total transaction value of approximately US$ 1.8 billion on a fully diluted basis. This price represents a premium of approximately 43% to GenMark’s unaffected closing share price on February 10, 2021, the last trading day before a media report was published speculating about a potential sale process. The merger agreement has been unanimously approved by the boards of directors of GenMark and Roche. Once the acquisition is completed, GenMark’s principal operations will continue at its current location in Carlsbad, California, USA.

Under the terms of the merger agreement, Roche will promptly commence a tender offer to acquire all outstanding shares of GenMark’s common stock, and GenMark will file a recommendation statement containing the unanimous recommendation of the GenMark board that GenMark stockholders tender their shares to Roche.

GenMark’s syndromic panel testing portfolio will complement Roche’s current molecular diagnostics portfolio and the Roche global network will enable expanded reach for GenMark’s products. GenMark’s ePlex system drives lab efficiency through streamlined order-to-reporting workflow and enables better patient outcomes by rapidly diagnosing a patient’s symptoms. Infectious diseases are a leading cause of death globally, and earlier detection of the cause of an infection has been shown to improve patient outcomes and improve key hospital initiatives such as antibiotic stewardship and length of stay.

“Acquiring GenMark Diagnostics will broaden our molecular diagnostics portfolio to include solutions that can provide lifesaving information quickly to patients and their healthcare providers in the fight against infectious diseases,” said Thomas Schinecker, CEO Roche Diagnostics. “Their proven expertise in syndromic panel testing provides faster targeted

therapeutic intervention, resulting in improved patient outcomes and reduced hospital stays, and will contribute to Roche’s commitment to helping control infectious diseases and antibiotic resistance. The rapid identification of bloodstream infections and the detection of antimicrobial resistance genes are more essential than ever for hospitals and their patients.”

“As a part of Roche, we can accelerate our mission to enable rapid diagnosis of infectious disease to improve patient outcomes. Together with Roche’s diagnostics healthcare solutions, we will be able to provide a full suite of molecular diagnostic solutions to customers around the world,” said Scott Mendel, CEO of GenMark Diagnostics. “We are thrilled to become a part of Roche and are confident that this is the right path forward for GenMark and our customers.”

GenMark’s Respiratory Pathogen Panels identify the most common viral and bacterial organisms associated with upper respiratory infection, including SARS-CoV-2, complementing Roche’s extensive portfolio of COVID-19 diagnostics solutions.

Terms of the Agreement

Under the terms of the merger agreement, Roche will promptly commence a tender offer to acquire all of the outstanding shares of GenMark’s common stock for US$ 24.05 per share in cash. Following the completion of the tender offer, Roche will acquire all remaining shares at the same price of US$ 24.05 per share in cash through a second step merger.

The transaction is expected to close in the 2^nd quarter of 2021 and is subject to customary closing conditions, including the tender of at least a majority of the outstanding shares of GenMark’s common stock and the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976.

Citi is acting as financial advisor to Roche and Sidley Austin LLP is acting as legal counsel to Roche. J.P. Morgan Securities LLC is acting as exclusive financial advisor to GenMark and DLA Piper LLP is acting as legal counsel to GenMark.

About GenMark Diagnostics

GenMark Diagnostics is a leading provider of multiplex molecular diagnostic solutions designed to enhance patient care, improve key quality metrics and reduce the total cost-of-care. Utilizing GenMark’s proprietary eSensor® detection technology, GenMark’s eSensor XT-8® and ePlex® systems are designed to support a broad range of molecular diagnostic sample-to-answer tests with compact, easy-to-use workstations and self-contained, disposable test cartridges. GenMark’s ePlex: The True Sample-to-Answer Solution^™ is designed to optimize laboratory efficiency and address a broad range of infectious disease testing needs, including respiratory, bloodstream and gastrointestinal infections.

About Roche

Roche is a global pioneer in pharmaceuticals and diagnostics focused on advancing science to improve people’s lives. The combined strengths of pharmaceuticals and diagnostics under one roof have made Roche the leader in personalised healthcare – a strategy that aims to fit the right treatment to each patient in the best way possible.

Roche is the world’s largest biotech company, with truly differentiated medicines in oncology, immunology, infectious diseases, ophthalmology and diseases of the central nervous system. Roche is also the world leader in vitro diagnostics and tissue-based cancer diagnostics, and a frontrunner in diabetes management.

Founded in 1896, Roche continues to search for better ways to prevent, diagnose and treat diseases and make a sustainable contribution to society. The company also aims to improve patient access to medical innovations by working with all relevant stakeholders. More than thirty medicines developed by Roche are included in the World Health Organization Model Lists of Essential Medicines, among them life-saving antibiotics, antimalarials and cancer medicines. Moreover, for the twelfth consecutive year, Roche has been recognised as one of the most sustainable companies in the Pharmaceuticals Industry by the Dow Jones Sustainability Indices (DJSI).

The Roche Group, headquartered in Basel, Switzerland, is active in over 100 countries and in 2020 employed more than 100,000 people worldwide. In 2020, Roche invested CHF 12.2 billion in R&D and posted sales of CHF 58.3 billion. Genentech, in the United States, is a wholly owned member of the Roche Group. Roche is the majority shareholder in Chugai Pharmaceutical, Japan. For more information, please visit www.roche.com.

All trademarks used or mentioned in this release are protected by law.

IMPORTANT ADDITIONAL INFORMATION AND WHERE TO FIND IT

THE TENDER OFFER FOR THE OUTSTANDING COMMON STOCK OF GENMARK DIAGNOSTICS HAS NOT BEEN COMMENCED. THIS ANNOUNCEMENT IS FOR INFORMATIONAL PURPOSES ONLY AND DOES NOT CONSTITUTE AN OFFER TO PURCHASE OR A SOLICITATION OF AN OFFER TO SELL GENMARK DIAGNOSTICS’ COMMON STOCK. THE SOLICITATION AND OFFER TO BUY GENMARK DIAGNOSTICS’ COMMON STOCK WILL ONLY BE MADE PURSUANT TO AN OFFER TO PURCHASE AND RELATED MATERIALS. AT THE TIME THE OFFER IS COMMENCED, ROCHE HOLDINGS, INC. (“ROCHE”) AND ITS ACQUISITION SUBSIDIARY, WILL FILE A TENDER OFFER STATEMENT ON SCHEDULE TO WITH THE SECURITIES AND EXCHANGE COMMISSION (THE “SEC”) AND THEREAFTER, GENMARK DIAGNOSTICS WILL FILE A SOLICITATION/RECOMMENDATION STATEMENT ON SCHEDULE 14D-9 WITH RESPECT TO THE OFFER. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THESE MATERIALS (INCLUDING AN OFFER TO PURCHASE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER TENDER OFFER DOCUMENTS) CAREFULLY WHEN THEY BECOME

AVAILABLE SINCE THEY WILL CONTAIN IMPORTANT INFORMATION, INCLUDING THE TERMS AND CONDITIONS OF THE OFFER. THE TENDER OFFER STATEMENT, SOLICITATION/RECOMMENDATION STATEMENT AND RELATED MATERIALS WILL BE FILED WITH THE SEC, AND INVESTORS AND SECURITY HOLDERS MAY OBTAIN A FREE COPY OF THESE MATERIALS (WHEN AVAILABLE) AND OTHER DOCUMENTS FILED BY ROCHE AND GENMARK DIAGNOSTICS WITH THE SEC AT THE WEBSITE MAINTAINED BY THE SEC AT WWW.SEC.GOV. INVESTORS AND SECURITY HOLDERS MAY ALSO OBTAIN FREE COPIES OF THE SOLICITATION/RECOMMENDATION STATEMENT AND OTHER DOCUMENTS FILED WITH THE SEC BY GENMARK DIAGNOSTICS AT WWW.GENMARKDX.COM.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

THIS ANNOUNCEMENT CONTAINS FORWARD-LOOKING STATEMENTS ABOUT GENMARK DIAGNOSTICS AS THAT TERM IS DEFINED IN SECTION 27A OF THE SECURITIES ACT OF 1933 AND SECTION 21E OF THE SECURITIES EXCHANGE ACT OF 1934. SOME OF THE STATEMENTS CONTAINED IN THIS ANNOUNCEMENT ARE FORWARD-LOOKING STATEMENTS, INCLUDING STATEMENTS REGARDING, AMONG OTHER THINGS, THE EXPECTED CONSUMMATION OF THE TRANSACTION, THE CONDUCT OF GENMARK DIAGNOSTICS’ PRINCIPAL OPERATIONS FOLLOWING SUCH CONSUMMATION, AND THE IMPACT OF GENMARK DIAGNOSTICS’ SYNDROMIC PANEL TESTING PORTFOLIO ON ROCHE’S MOLECULAR DIAGNOSTICS PORTFOLIO, ALL OF WHICH INVOLVE A NUMBER OF RISKS AND UNCERTAINTIES, INCLUDING, THE SATISFACTION OF CLOSING CONDITIONS FOR THE TRANSACTION, SUCH AS REGULATORY APPROVAL, THE TENDER OF A MAJORITY OF THE OUTSTANDING SHARES OF COMMON STOCK OF GENMARK DIAGNOSTICS, THE POSSIBILITY THAT THE TRANSACTION WILL NOT BE COMPLETED, AND OTHER RISKS AND UNCERTAINTIES DISCUSSED IN GENMARK DIAGNOSTICS’ PUBLIC FILINGS WITH THE SEC, INCLUDING THE “RISK FACTORS” SECTION OF GENMARK DIAGNOSTICS’ ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 2020 AND SUBSEQUENT QUARTERLY REPORTS ON FORM 10-Q, AS WELL AS THE TENDER OFFER DOCUMENTS TO BE FILED BY ROCHE AND ITS ACQUISITION SUBSIDIARY AND THE SOLICITATION/RECOMMENDATION STATEMENT TO BE FILED BY GENMARK DIAGNOSTICS. THESE STATEMENTS ARE BASED ON CURRENT EXPECTATIONS, ASSUMPTIONS, ESTIMATES AND PROJECTIONS, AND INVOLVE KNOWN AND UNKNOWN RISKS, UNCERTAINTIES AND OTHER FACTORS THAT MAY CAUSE RESULTS, LEVELS OF ACTIVITY, PERFORMANCE OR ACHIEVEMENTS TO BE MATERIALLY DIFFERENT FROM ANY FUTURE STATEMENTS. THESE STATEMENTS ARE GENERALLY IDENTIFIED BY WORDS OR PHRASES SUCH AS “BELIEVE”, “ANTICIPATE”, “EXPECT”, “INTEND”, “PLAN”, “WILL”, “MAY”, “SHOULD”, “ESTIMATE”, “PREDICT”, “POTENTIAL”, “CONTINUE” OR THE NEGATIVE OF SUCH TERMS OR OTHER SIMILAR EXPRESSIONS. IF UNDERLYING ASSUMPTIONS PROVE INACCURATE OR UNKNOWN RISKS OR UNCERTAINTIES MATERIALIZE, ACTUAL RESULTS AND THE TIMING OF EVENTS MAY DIFFER MATERIALLY FROM THE

RESULTS AND/OR TIMING DISCUSSED IN THE FORWARD-LOOKING STATEMENTS, AND YOU SHOULD NOT PLACE UNDUE RELIANCE ON THESE STATEMENTS. ROCHE AND GENMARK DIAGNOSTICS DISCLAIM ANY INTENT OR OBLIGATION TO UPDATE ANY FORWARD-LOOKING STATEMENTS AS A RESULT OF DEVELOPMENTS OCCURRING AFTER THE PERIOD COVERED BY THIS RELEASE OR OTHERWISE.

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