Exhibit 99.1

Regulus Reports Third Quarter 2017 Financial Results and Recent Events

Conference Call Today at 5:00 p.m. ET

LA JOLLA, Calif., November 7, 2017 – Regulus Therapeutics Inc. (Nasdaq: RGLS), a biopharmaceutical company leading the discovery and development of innovative medicines targeting microRNAs, today summarized recent events and reported financial results for the three and nine months ended September 30, 2017.

“The third quarter was marked by the successful completion of our financing, as well as significant operational progress on our two clinical programs,” said Jay Hagan, President and Chief Executive Officer of Regulus. “We are very pleased that both of our Alport studies are now active, the investigational new drug (IND) for the treatment of autosomal dominant polycystic kidney disease (ADPKD) has been filed, and a Phase I study remains on track to initiate by year-end.”

Third Quarter Corporate Highlights and Recent Events

Third Quarter Financial Results

Cash Position: As of September 30, 2017, Regulus had cash, cash equivalents and short-term investments of $71.4 million.

Research and Development (R&D) Expenses: R&D expenses were $12.7 million and $42.7 million for the three and nine months ended September 30, 2017, respectively, compared to $14.6 million and $49.3 million for the same periods in 2016. The decrease in R&D expenses for the three months ended September 30, 2017 compared to 2016 was driven by the planned reduction in personnel-related costs as a result of our May 2017 corporate restructuring. The decrease in R&D expenses for the nine months ended September 30, 2017 compared to 2016 was primarily driven by the wind-down of clinical activities related to the RG-101 program.

Revenue: Revenue was less than $0.1 million for each of the three and nine months ended September 30, 2017, compared to $0.2 million and $1.2 million for the same periods in 2016.

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Net Loss: Net loss was $15.8 million and $57.5 million for the three and nine months ended September 30, 2017, respectively, compared to a net loss of $19.5 million and $61.8 million for the same periods in 2016. Basic and diluted net loss per share was $0.18 and $0.88 for the three and nine months ended September 30, 2017, respectively, compared to $0.37 and $1.17 for the same periods in 2016.

Conference Call Details

Regulus will host a conference call and webcast today at 5:00 p.m. Eastern Time to discuss third quarter 2017 financial results and corporate highlights. A live webcast of the call will be available online at www.regulusrx.com. To access the call, please dial (877) 257-8599 (domestic) or (970) 315-0459 (international) and refer to conference ID 9297128. To access the telephone replay of the call, dial (855) 859-2056 (domestic) or (404) 537-3406 (international), conference ID 9297128. The webcast and telephone replay will be archived on the Company’s website following the call.

About Regulus

Regulus Therapeutics Inc. (Nasdaq: RGLS) is a clinical stage biopharmaceutical company leading the discovery and development of innovative medicines targeting microRNAs. Regulus has leveraged its oligonucleotide drug discovery and development expertise to develop a well-balanced microRNA therapeutics pipeline complemented by a rich intellectual property estate to retain its leadership in the microRNA field. Regulus is advancing several programs in renal, hepatic and central nervous systems diseases. Regulus maintains its corporate headquarters in La Jolla, CA. For more information, please visit http://www.regulusrx.com.

Forward-Looking Statements

Statements contained in this press release regarding matters that are not historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements associated with the expected ability of Regulus to undertake certain activities and accomplish certain goals (including with respect to development and other activities related to RG-012 or RGLS4326), the projected timeline of clinical development activities, and expectations regarding future therapeutic and commercial potential of Regulus’ business plans, technologies and intellectual property related to microRNA therapeutics and biomarkers being discovered and developed by Regulus. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Words such as “believes,” “anticipates,” “plans,” “expects,” “intends,” “will,” “goal,” “potential” and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based upon Regulus’ current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. These and other risks concerning Regulus’ financial position and programs are described in additional detail in Regulus filings with the Securities and Exchange Commission. All forward-looking statements contained in this press release speak only as of the date on which they were made. Regulus undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

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Investor Relations Contact:

Allison Wey

858-202-6321

awey@regulusrx.com

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Regulus Therapeutics Inc.

Selected Financial Information

Condensed Statement of Operations

(In thousands, except share and per share data)

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