Exhibit 99.1

For Immediate Release

Enanta Pharmaceuticals Reports Financial Results for its Fiscal Third Quarter Ended June 30, 2020 with Webcast and Conference Call Today at 4:30 p.m. ET

WATERTOWN, Mass., August 4, 2020 – Enanta Pharmaceuticals, Inc. (NASDAQ:ENTA), a clinical-stage biotechnology company dedicated to creating small molecule drugs for viral infections and liver diseases, today reported financial results for its fiscal third quarter ended June 30, 2020.

“During the past quarter, Enanta made progress in our clinical development programs, laying the groundwork for several catalyst-rich quarters to come. Our virology programs, developed from years of antiviral drug discovery expertise, continue to advance with the initiation of our Phase 1b clinical trial in viremic HBV patients and the resumption of our Phase 1b study in HBV patients currently treated with nucleos(t)ide reverse transcriptase inhibitors, which was previously paused due to the COVID-19 pandemic,” said Jay R. Luly, Ph.D., President and Chief Executive Officer of Enanta Pharmaceuticals. “In addition, our Phase 2b RSVP trial in RSV is ongoing, and we are on schedule to initiate two additional studies for the condition, one in pediatric patients and a second in adult transplant patients, by year end. Finally, we are also excited about advancing our candidates in NASH this quarter, starting with the initiation of the ARGON-2 trial of EDP-305, our potent FXR agonist candidate, and the planned initiation later this quarter of the Phase 1 study of EDP-297, our highly potent and targeted follow-on FXR agonist.”

Fiscal Third Quarter Ended June 30, 2020 Financial Results

Total revenue of $18.7 million for the three months ended June 30, 2020 consisted of royalty revenue derived primarily from worldwide net sales of AbbVie’s hepatitis C virus (HCV) regimen

MAVYRET®/MAVIRET®. For the three months ended June 30, 2019, total revenue was $44.4 million, which consisted of royalty revenue earned on AbbVie’s global net sales of its HCV regimens. AbbVie has stated that the decrease in royalty revenue in the three months ended June 30, 2020 was mainly driven by declining treated patient volumes due to the COVID-19 pandemic.

Research and development expenses increased slightly to $34.7 million for the three months ended June 30, 2020, compared to $34.5 million for the three months ended June 30, 2019.

General and administrative expenses totaled $6.8 million for the three months ended June 30, 2020, compared to $6.2 million for the three months ended June 30, 2019. The slight increase was due to an increase in compensation expense.

Enanta recorded an income tax benefit of $7.1 million for the three months ended June 30, 2020 compared to an income tax benefit of $0.9 million for the same period in 2019. The income tax benefit in 2020 was driven by the company’s net loss for the period, federal research and development tax credits, and a federal net operating loss carry back.

Net loss for the three months ended June 30, 2020 was $14.3 million, or a loss of $0.71 per diluted common share, compared to net income of $7.0 million, or $0.33 per diluted common share, for the corresponding period in 2019.

Enanta’s cash, cash equivalents and marketable securities totaled $435.4 million at June 30, 2020. This compares to a total of $400.2 million at September 30, 2019, its fiscal year end. Enanta expects that its current cash, cash equivalents and short-term and long-term marketable securities, as well as its continuing royalty revenue, will continue to be sufficient to meet the anticipated cash requirements of its existing business and development programs for the foreseeable future.

Pipeline Programs and Near-term Milestones

Upcoming Events and Presentations

Conference Call and Webcast Information
Enanta will host a conference call and webcast today at 4:30 p.m. ET. To participate in the live conference call, please dial (855) 840-0595 in the U.S. or (518) 444-4814 for international callers. A replay of the conference call will be available starting at approximately 7:30 p.m. ET on August 4, 2020, through 11:59 p.m. ET on August 6, 2020 by dialing (855) 859-2056 from the U.S. or (404) 537-3406 for international callers. The passcode for both the live call and the replay is 7561838. A live audio webcast of the call and replay can be accessed by visiting the “Events and Presentations” section on the “Investors” page of Enanta’s website at www.enanta.com.

About Enanta Pharmaceuticals, Inc.

Enanta is using its robust, chemistry-driven approach and drug discovery capabilities to become a leader in the discovery and development of small molecule drugs for the treatment of viral infections and liver diseases. Enanta’s research and development efforts have produced clinical candidates for the following disease targets: respiratory syncytial virus (RSV), non-alcoholic steatohepatitis (NASH) and hepatitis B virus (HBV). Enanta is also conducting research in human metapneumovirus (hMPV) and SARS-CoV-2 (COVID-19).  

Enanta’s research and development activities are funded by royalties from hepatitis C virus (HCV) products developed under its collaboration with AbbVie. Glecaprevir, a protease inhibitor discovered by

Enanta, is sold by AbbVie in numerous countries as part of its leading treatment for chronic HCV infection under the tradenames MAVYRET® (U.S.) and MAVIRET® (ex-U.S.) (glecaprevir/pibrentasvir). Please visit www.enanta.com for more information.

FORWARD LOOKING STATEMENTS

This press release contains forward-looking statements, including statements with respect to the prospects for advancement of Enanta’s clinical programs in RSV, NASH and HBV, as well as the prospects for advancing research in hMPV and SARS-CoV-2 and future royalty revenue to Enanta from sales of AbbVie’s MAVYRET/MAVIRET regimen for HCV. Statements that are not historical facts are based on management’s current expectations, estimates, forecasts and projections about Enanta’s business and the industry in which it operates and management’s beliefs and assumptions. The statements contained in this release are not guarantees of future performance and involve certain risks, uncertainties and assumptions, which are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed in such forward-looking statements. Important factors and risks that may affect actual results include: the dependence of Enanta’s revenues in the short-term upon the continued success of AbbVie’s sales of its MAVYRET/MAVIRET HCV regimen; the impact of development, regulatory and marketing efforts of others with respect to competitive treatments for RSV, NASH, HBV, hMPV and SARS-CoV-2; treatment rates, competitive pricing, and reimbursement rate actions affecting MAVYRET/MAVIRET compared to competitive HCV products on the market; the impact COVID-19 could have on number of patient treatments which could impact MAVYRET/MAVIRET sales; the discovery and development risks of Enanta’s programs in RSV, NASH and HBV; the competitive impact of development, regulatory and marketing efforts of others in those disease areas; Enanta’s lack of clinical development experience; Enanta’s need to attract and retain senior management and key research and development personnel; Enanta’s need to obtain and maintain patent protection for its product candidates and avoid potential infringement of the intellectual property rights of others; the realizability of our deferred tax assets; and other risk factors described or referred to in “Risk Factors” in Enanta’s most recent Form 10-Q for the quarter ended March 31, 2020, and other periodic reports filed more recently with the Securities and Exchange Commission. Enanta cautions investors not to place undue reliance on the forward-looking statements contained in this release. These statements speak only as of the date of this release, and Enanta undertakes no obligation to update or revise these statements, except as may be required by law.

Media and Investor Contact:

Jennifer Viera

Tel: 617-744-3848

jviera@enanta.com

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