Recent Highlights in Large Market Ophthalmology Portfolio

• 4D-150 for wet AMD & DME (Data cutoff: June 24, 2024):

  • 4D-150 continues to be safe and well tolerated in 139 patients treated to date across wet AMD (PRISM clinical trial) and DME (SPECTRA clinical trial)

    • No significant inflammation reported in 51 patients treated to date with planned Phase 3 dose (3E10 vg/eye) and topical corticosteroid regimen

    • Overall rate of mild (Grade 1) inflammation ~2%; previously reported episode of mild to moderate inflammation in low dose patient (1E10 vg/eye) determined by Principal Investigator to be not related to 4D-150

  • Presented initial interim 24-week landmark data from the Population Extension cohort of the PRISM Phase 2 Clinical Trial at the American Society of Retina Specialists (ASRS) Annual Scientific Meeting in July:

    • Two loading doses of aflibercept at Week -1 and Week 4 are consistent with loading regimens seen in earlier lines of treatment of wet AMD to maintain patient safety during ramp up of aflibercept transgene expression over 8-12 weeks

    • Robust reduction in anti-VEGF injection treatment burden demonstrated in 30 patients treated with planned Phase 3 dose (3E10 vg/eye) with 89% reduction in annualized injection rate; 93% of patients received 0 or 1 injection and 77% were injection-free

    • Improvement in mean best corrected visual acuity (BCVA) from baseline at 3E10 vg/eye dose (+4.2 letters)

    • 3E10 vg/eye dose demonstrated sustained and greater anatomic control without fluctuations

• 4D-175 for Geographic Atrophy:

  • Received FDA clearance of Investigational New Drug (IND) application for 4D-175
    

Recent Highlights in Other Pipeline Programs

• 4D-710 for Cystic Fibrosis (CF) Lung Disease:

  • Positive interim data from Phase 1/2 AEROW clinical trial of aerosolized 4D-710 for modulator-ineligible/-intolerant cystic fibrosis presented at 47^th European Cystic Fibrosis Conference in June:

    • Aerosolized 4D-710 was well tolerated at doses up to 1E15 vg (n=6)

    • Clinically meaningful improvements in ppFEV₁ at 12 months observed in 2 of 3 trial participants with mild to moderate baseline lung function impairment (ppFEV₁ 50-80%) and >6 months follow up

    • Dose-dependent and widespread 4D-710-mediated CFTR transgene RNA and protein expression observed in all lung biopsies from all trial participants evaluated to date

    • Pre-existing AAV immunity cross-reactive with A101 did not affect transgene expression, biological activity or safety

    • 1E15 vg dose cleared for evaluation in Phase 2 Dose Expansion cohort

• 4D-310 for Fabry Disease Cardiomyopathy:

  • FDA removed clinical hold on the Phase 1/2 INGLAXA study for 4D-310 in Fabry disease cardiomyopathy
    

Expected Upcoming Milestones in Large Market Ophthalmology Portfolio

• 4D-150 for Wet AMD:

  • Interim longest available follow up data up to 2.5 years from its Phase 1/2 PRISM clinical trial evaluating intravitreal 4D-150 in wet AMD are expected to be presented at the 24^th EURETINA Congress on September 19, 2024:

    • Severe disease activity: Phase 1 Dose Exploration cohort, Phase 2 Dose Expansion cohort

    • Broad disease activity (which includes patients representative of the planned Phase 3 study population): Phase 2 Population Extension cohort

  • 52-week landmark analyses for both 1) severe disease activity (Dose Expansion) & 2) broad wet AMD disease activity (Population Extension) cohorts of PRISM expected in February 2025 (last patient, last visit January 2025)

  • First Phase 3 clinical trial initiation expected in Q1 2025

• 4D-150 for DME:

  • Interim data from SPECTRA Phase 2 Part 1 Dose Confirmation cohort (n=22) expected in Q4 2024

• Virtual 4D-150 Development Day Planned in September 2024:

  • Company will host a Corporate Webcast during which senior leadership and key opinion leaders will review clinical data from the PRISM clinical trial and final wet AMD Phase 3 clinical trial design

  • Participating key opinion leaders and details regarding the webcast will be provided in advance of the event

• 4D-175 for Geographic Atrophy:

  • Phase 1 enrollment expected to begin in H2 2024
    

Expected Upcoming Milestones in Other Pipeline Programs

• 4D-710 for CF Lung Disease:

  • Interim data update from AEROW clinical trial is expected in mid-2025

  • Phase 3 initiation is expected in H2 2025

• 4D-725 for Alpha-1-Antitrypsin Deficiency Lung Disease:

  • Program update expected in Q4 2024

• 4D-310 for Fabry Disease Cardiomyopathy:

  • Resume enrollment in H2 2024 with program update expected in 2025

• 4D-110 for Choroideremia and 4D-125 for X-Linked Retinitis Pigmentosa:

  • Program updates expected in Q4 2024
    

Q2 2024 Financial Results

Cash and Cash Equivalents and Marketable Securities: Cash and cash equivalents and marketable securities were $578 million as of June 30, 2024, as compared to $299 million as of December 31, 2023. The net increase in cash was primarily a result of cash inflows from approximately $316 million of net proceeds from our public offering of common stock completed in February including partial exercise of underwriters’ option to purchase additional shares. We currently expect cash and cash equivalents to be sufficient to fund operations into the first half of 2027.

R&D Expenses: Research and development expenses were $31.9 million for the second quarter of 2024, as compared to $23.6 million for the second quarter of 2023. This increase was driven by the progression of our existing clinical trials, primarily Phase 2 4D-150 trials in wet AMD and DME, along with increased payroll and stock-based compensation expense due to higher headcount.

G&A Expenses: General and administrative expenses were $10.6 million for the second quarter of 2024, as compared to $8.8 million for the second quarter of 2023.

Net Loss: Net loss was $35.0 million for the second quarter of 2024, as compared to net loss of $29.6 million for the second quarter of 2023.

About 4DMT

4DMT is a leading clinical-stage genetic medicines company focused on unlocking the full potential of genetic medicines to treat large market diseases in ophthalmology and pulmonology. 4DMT’s proprietary invention platform, Therapeutic Vector Evolution, combines the power of the Nobel Prize-winning technology, directed evolution, with approximately one billion synthetic AAV capsid-derived sequences to invent customized and evolved vectors for use in our wholly owned and partnered product candidates. Our product design, development, and manufacturing engine helps us efficiently create and advance our diverse product pipeline with the goal of revolutionizing medicine with potential curative therapies for millions of patients. Currently, 4DMT is advancing six clinical-stage and one preclinical product candidate, each tailored to address rare and large market diseases in ophthalmology, pulmonology and cardiology. In addition, 4DMT is also advancing programs in CNS through a gene editing partnership. 4D Molecular Therapeutics?, 4DMT?, Therapeutic Vector Evolution?, and the 4DMT logo are trademarks of 4DMT.

All of our product candidates are in clinical or preclinical development and have not yet been approved for marketing by the U.S. Food and Drug Administration (FDA) or any other regulatory authority. No representation is made as to the safety or effectiveness of our product candidates for the therapeutic uses for which they are being studied.

Learn more at www.4DMT.com and follow us on LinkedIn.

Forward Looking Statements:

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including, without limitation, implied and express statements regarding the therapeutic potential and clinical benefits of, as well as the plans, announcements and related timing for the clinical development of, 4DMT’s product candidates, and statements regarding our financial performance, results of operations and anticipated cash runway. The words "may," “might,” "will," "could," "would," "should," "expect," "plan," "anticipate," "intend," "believe," “expect,” "estimate," “seek,” "predict," “future,” "project," "potential," "continue," "target" and similar words or expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward looking statements in this press release are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including risks and uncertainties that are described in greater detail in the section entitled "Risk Factors" in 4D Molecular Therapeutics’ most recent Quarterly Report on Form 10-Q to be filed on or about the date hereof, as well as any subsequent filings with the Securities and Exchange Commission. In addition, any forward-looking statements represent 4D Molecular Therapeutics' views only as of today and should not be relied upon as representing its views as of any subsequent date. 4D Molecular Therapeutics explicitly disclaims any obligation to update any forward-looking statements. No representations or warranties (expressed or implied) are made about the accuracy of any such forward-looking statements.

Contacts:

Media:

Katherine Smith
Inizio Evoke Comms
[email protected]

Investors:

Julian Pei
Head of Investor Relations and Corporate Finance
[email protected]