GlobeNewswire Inc | Mar 4, 2021 07:35AM EST

March 04, 2021

- Preclinical Data Further Validate FORCE Platform; Driving Toward IND Submissions for DM1, DMD and FSHD Programs Between Q421 and Q422 -

- Recent Appointments to Experienced Leadership Team Strengthen Company's Clinical Development Capabilities -

- Successful Financings Expected to Provide Cash Runway into the Second Half of 2024 -

WALTHAM, Mass., March 04, 2021 (GLOBE NEWSWIRE) -- Dyne Therapeutics, Inc. (Nasdaq: DYN), a muscle disease company focused on advancing innovative life-transforming therapeutics for people living with genetically driven diseases, today reported financial results for the fourth quarter and full year 2020 and recent business highlights.

2020 was a transformationalyear for Dyne.We delivered validating data for our FORCE platform and programs,further strengthened our exceptional team with theaddition of highly experienced leaders and completed our IPO. Togetherwith earlier financings in 2020 and the follow-on public offering completed in January 2021, we have raised more than $550 million, which we expect to support us into the second half of 2024. We begin 2021 focused ondriving our DM1, DMD and FSHD programs to theclinicas we pursue our goal of delivering potentially life-transforming therapies to people living with serious muscle diseases, said Joshua Brumm, president and chief executive officer ofDyne.

Recent Highlights

-- In January 2021, Dyne announced new preclinical data from its myotonic dystrophy type 1 (DM1) program demonstrating robust RNA knockdown of toxic human nuclear DMPK, the genetic basis of the disease. To assess the ability of its lead DM1 candidate to reduce toxic human nuclear DMPK RNA, Dyne developed an innovative hTfR1/DMSXL mouse model that expresses the human TfR1 (hTfR1) and carries a human DMPK gene that represents a severe DM1 phenotype with more than 1,000 CTG repeats. In this model, two doses (2 x 10 mg/kg) of Dynes candidate resulted in significant toxic human nuclear DMPK knockdown at 14 days: 60 percent in the heart; 56 percent in the diaphragm; 54 percent in the tibialis anterior and 39 percent in the gastrocnemius. In the study, Dynes candidate was well tolerated. Dyne expects to share data from the hTfR1/DMSXL model at a scientific meeting during 2021. -- The Company further strengthened its leadership team with the appointment of Wildon Farwell, M.D., MPH, as chief medical officer, announced separately today, and Ashish Dugar, Ph.D., MBA, as senior vice president, global head of medical affairs, in February 2021.

-- In January 2021, Dyne completed its follow-on public offering of 6,000,000 shares of its common stock at a public offering price of $28.00 per share. Gross proceeds of the offering before deducting the underwriting discount and commissions and offering expenses were approximately $168 million. Dyne expects its cash, cash equivalents and marketable securities as of December 31, 2020, together with the net proceeds from the January 2021 public offering, will be sufficient to fund its operating expenses and capital expenditure requirements into the second half of 2024.

Upcoming Scientific & Investor Conference Presentations

-- Dyne is scheduled to participate in the 2021 MDA Virtual Clinical & Scientific Conference. Romesh Subramanian, Ph.D., chief scientific officer, will present as part of the panel Therapeutic Considerations for Dominant Neuromuscular Diseases, and Oxana Beskrovnaya, Ph.D., senior vice president, head of research, will participate in the Non-viral Delivery in Neuromuscular Disease session. Both presentations will take place on March 15, 2021 and will be available to registered attendees at: https://mdavirtualconference.org/. -- Dr. Beskrovnaya also intends to present on Dynes FORCE platform during the virtual 7th Cold Spring Harbor Laboratory meeting on Nucleic Acid Therapies on March 24, 2021, which is accessible to registered participants at: https://meetings.cshl.edu/meetings.aspx?meet=NAT&year=21. -- Mr. Brumm and Dr. Subramanian are scheduled to participate in a virtual fireside chat during Stifels 3rd Annual CNS Day on April 1, 2021 at 10:30 am ET. A live webcast will be available in the Investors & Media section of Dynes website at https://investors.dyne-tx.com/investors-and-media and a replay will be accessible for 90 days following the presentation.

Fourth Quarter and Full Year 2020 Financial Results

Cash position: Cash, cash equivalents and marketable securities were $345.3 million as of December 31, 2020. Additionally, in January 2021, Dyne completed a public offering of common stock, with gross proceeds totaling approximately $168 million.

Research and development (R&D) expenses: R&D expenses were $22.1 million and $4.3 million for the quarters ended December 31, 2020 and 2019, respectively. R&D expenses were $45.2 million and $11.0 million for the years ended December 31, 2020 and 2019, respectively.

General and administrative (G&A) expenses: G&A expenses were $6.5 million and $1.2 million for the quarters ended December 31, 2020 and 2019, respectively. G&A expenses were $13.4 million and $2.8 million for the years ended December 31, 2020 and 2019, respectively.

Net loss: Net loss for the quarter ended December 31, 2020 was $28.6 million, or $0.64 per basic and diluted share. This compares with a net loss of $5.4 million, or $2.10 per basic and diluted share, for the quarter ended December 31, 2019. Net loss for the year ended December 31, 2020 was $59.4 million, or $4.13 per basic and diluted share. This compares with a net loss of $14.9 million, or $6.08 per basic and diluted share, for the year ended December 31, 2020.

About Dyne Therapeutics

Dyne Therapeutics is building a leading muscle disease company dedicated to advancing innovative life-transforming therapeutics for people living with genetically driven diseases.With its proprietary FORCE platform, Dyne is developing modern oligonucleotide therapeutics that are designed toovercome limitations in delivery to muscle tissue seen with other approaches.Dynes broad portfolio of therapeutic candidates for serious muscle diseases includes programs for myotonicdystrophy type 1 (DM1), Duchenne muscular dystrophy (DMD) and facioscapulohumeral muscular dystrophy (FSHD). For more information, please visit https://www.dyne-tx.com/, and follow us onTwitter,LinkedInandFacebook.

Forward-Looking Statements

This press release contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, contained in this press release, including statements regarding Dynes strategy, future operations, prospects, plans, objectives of management, the expected timeline for submitting investigational new drug applications and achieving proof-of-concept data readouts and the sufficiency of its cash resources, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. The words anticipate, believe, continue, could, estimate, expect, intend, may, might, objective, ongoing, plan, predict, project, potential, should, or would, or the negative of these terms, or other comparable terminology are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Dyne may not actually achieve the plans, intentions or expectations disclosed in these forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result of various important factors, including: uncertainties inherent in the identification and development of product candidates, including the conduct of research activities and the initiation and completion of preclinical studies and clinical trials; uncertainties as to the availability and timing of results from preclinical studies and clinical trials; the timing of and Dynes ability to submit investigational new drug applications; whether results from preclinical studies will be predictive of the results of later preclinical studies and clinical trials; uncertainties related to Dynes ability to obtain sufficient cash resources to fund the Companys foreseeable and unforeseeable operating expenses and capital expenditure requirements for the anticipated periods; the impact of the COVID-19 pandemic on Dynes business and operations; as well as the risks and uncertainties identified in Dynes filings with the Securities and Exchange Commission (SEC), including the Companys Annual Report on Form 10-K for the year ended December 31, 2020 and in subsequent filings Dyne may make with the SEC. In addition, the forward-looking statements included in this press release represent Dynes views as of the date of this press release. Dyne anticipates that subsequent events and developments will cause its views to change. However, while Dyne may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Dynes views as of any date subsequent to the date of this press release.

Contact:

Dyne TherapeuticsAmy Reillyareilly@dyne-tx.com857-341-1203

Dyne Therapeutics, Inc.Condensed Consolidated Statement of Operations(in thousands, except share and per share data) Three Months Ended December Year Ended December 31, 31, 2020 2019 2020 2019 Operating expenses:Research and $ 22,098 $ 4,259 $ 45,200 $ 11,040 developmentGeneral and 6,502 1,211 13,447 2,786 administrativeTotal operating 28,600 5,470 58,647 13,826 expensesLoss from (28,600 ) (5,470 ) (58,647 ) (13,826 )operationsOther (expense) (49 ) 67 (790 ) (1,033 )incomeNet loss $ (28,649 ) $ (5,403 ) $ (59,437 ) $ (14,859 )Net loss pershare?basic and $ (0.64 ) $ (2.10 ) $ (4.13 ) $ (6.08 )dilutedWeighted-averagecommon sharesoutstanding used 45,058,494 2,567,007 14,395,955 2,442,872 in netloss pershare?basic anddiluted

Dyne Therapeutics, Inc.Condensed Consolidated Balance Sheet Data(in thousands) December31, December31, 2020 2019Assets Cash, cash equivalents and marketable securities $ 345,314 $ 14,632Other assets 8,020 1,804Total assets $ 353,334 $ 16,436Liabilities and Stockholders? Equity Liabilities 10,967 2,400Stockholders? equity 342,367 14,036Total liabilities and stockholders? equity $ 353,334 $ 16,436