Krystal Biotech, Inc. (KRYS)

While our focus is on the development of gene therapies to treat patients with rare diseases with high unmet medical needs, we are also evaluating the potential of our platform to address more common severe or life-threatening diseases, such as non-small cell lung cancer (“NSCLC”), as well as aesthetic conditions via our wholly-owned subsidiary Jeune Aesthetics, Inc. (“Jeune Aesthetics”), which we incorporated in April 2019. Our Redosable Gene Therapy Platform We believe that certain inherent features of the HSV-1 virus, combined with the modifications we have made to the viral backbone provides our proprietary gene therapy platform with specific advantages over other viral and non-viral vector platforms and represents an opportunity to generate a portfolio of highly differentiated and potentially first-in-class or best-in-class genetic medicines.

Advantages of our gene therapy technology platform include the following: • Repeat Administration : One of the major challenges with many viral vector platforms is that the host immune system may recognize them as foreign agents and launch a robust immune response, resulting in toxicity and rapid removal of the virus. Wild-type HSV-1 is known to persist in the body by becoming latent and hiding from the immune system. We have harnessed the natural ability of HSV-1 to evade host-mediated immunogenicity, while removing specific viral elements that exacerbate host immunity, thus making our viral vector safer for repeat administration as needed to achieve durability of effect. The immune evasive properties of our vector also enable us to treat patients who may have baseline antibodies to HSV-1, ensuring that prior exposure to the wild-type virus will not limit the number of patients who may be amenable to treatment with VYJUVEK or our product candidates.

• Non-Integrating Nature : Upon entry into cells, the HSV-1 vector persists as an episomal unit in the nucleus, meaning it remains physically separate from the host cell chromosome. Certain other viral vectors currently being used in the development of gene therapy treatments, such as the lentiviral and retroviral vectors, integrate into the host cell DNA to achieve gene expression. Integration into the host cell DNA carries the risk of disrupting host genes. In contrast, a non-integrating vector such as our HSV-1-based vector does not carry the same risk of disrupting the expression of host cell genes. • Payload Capacity : HSV-1 is a large virus, approximately 150 kilobases, or Kb, of DNA in size.

We have made strategic deletions within this genome to remove critical “immediate early”, or IE, genes. These IE genes are required for expression of most of the downstream genes that allow the HSV-1 virus to replicate and destroy host cells. Deletion of these IE genes inhibits expression of most of the viral proteins, making the resulting viral vector replication-deficient and non-toxic. These deletions also enable the vector to easily accommodate a payload of 35 Kb or greater without any significant impact on yield or titer. In VYJUVEK, we have successfully inserted two functional copies of the complete ~9 Kb human COL7A1 gene. In contrast, packaging capacity for most other vectors being used is at or under ~10 Kb, which limits their ability to deliver large transgenes.

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We are preparing multiple additional marketing authorization applications for VYJUVEK, including for Switzerland and Australia, which we expect to submit in the second half of 2026. Net VYJUVEK product revenue was $119.2 million for the three months ended June 30, 2026, and $965.9 million in cumulative net product revenue since our first launch of VYJUVEK in the United States in 2023. Gross margin for the three months ended June 30, 2026 was 95%. We define gross margin as product revenue, net less cost of goods sold expressed as a percentage of product revenue, net. 18 Pipeline Highlights and Recent Developments Ophthalmology KB803 for Ocular Complications in Patients with DEB KB803 is a redosable eye drop formulation of B-VEC, designed for the treatment of ocular complications that are thought to affect over 25% of DEB patients.

Sources and Uses of Cash The following table summarizes our sources and uses of cash for the six months ended June 30, 2026 and 2025: Six Months Ended June 30, 2026 2025 (in thousands) (unaudited) Net cash provided by operating activities $ 155,171 $ 83,698 Net cash (used in) investing activities (225,167) (65,294) Net cash provided by (used in) financing activities 4,594 (10,670) Effect of exchange rate changes on cash and cash equivalents (3,162) 1,230 Net (decrease) increase in cash $ (68,564) $ 8,964 Operating Activities Net cash provided by operating activities for the six months ended June 30, 2026 and 2025 was $155.2 million and $83.7 million, respectively. […]

Forward-looking statements include all statements that are not historical facts and can be identified by terms such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “seek,” “should,” “target,” “will,” “would,” or similar expressions and the negatives of those terms. These statements relate to future events or to our future operating or financial performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performances or achievements expressed or implied by the forward-looking statements.

Forward-looking statements appearing in this Quarterly Report on Form 10-Q include, but are not limited to, statements about the following, among other things: • our commercialization plans in the United States, the European Union (the “EU”), Japan, the United Kingdom (the “UK”), and elsewhere for our first commercial product, VYJUVEK (beremagene geperpavec-svdt) for the treatment of dystrophic epidermolysis bullosa (“DEB”), including timing of pricing negotiations and potential commercial launches; • the design, initiation, enrollment, timing, progress, and results of clinical trials for our product candidates, as well as expected timing of regulatory filings and reporting of data readouts from our clinical trials; • our beliefs about our proprietary HSV-1 based vector platform; • our expectations regarding future fluctuations in revenue and anticipated increases in certain expenses; and • our commercialization, marketing, and manufacturing capabilities and strategy.

Forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those referenced in Part I, Item 1A of the 2025 Form 10-K and other filings we make with the SEC from time to time. Moreover, we operate in a very competitive and rapidly changing environment, and new risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this Quarterly Report on Form 10-Q may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should read this Quarterly Report on Form 10-Q completely and with the understanding that our actual future results may be materially different from what we expect. Forward-looking statements represent our management’s beliefs and assumptions only as of the date of filing this Quarterly Report on Form 10-Q with the SEC. Except as required by law, we assume no obligation to update these forward-looking statements publicly as a result of subsequent events, developments or otherwise, or to update the reasons actual results could differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future. Throughout this Quarterly Report on Form 10-Q, unless the context requires otherwise, all references to “Krystal,” the “Company,” “we,” “our,” “us,” or similar terms refer to Krystal Biotech, Inc., together with its consolidated subsidiaries.

Web links throughout this Quarterly Report on Form 10-Q are provided for convenience only and are not intended to be active hyperlinks to the referenced websites. No content on the referenced websites shall be deemed incorporated by reference into this Quarterly Report on Form 10-Q. 17 Overview We are a fully integrated, global, commercial-stage biotechnology company focused on the discovery, development, manufacturing, and commercialization of genetic medicines to treat diseases with high unmet medical needs. […]

In some countries, the patent term may be extended to recapture a portion of the term lost during regulatory review of the product candidate. For example, in the United States, under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly known as the Hatch-Waxman Act, a patent that covers an FDA-approved biologic may be eligible for patent term extension (for up to 5 years, but not beyond a total of 14 years from the date of product approval) as compensation for patent term lost during the FDA regulatory review process. The application for the extension must be submitted prior to the expiration of the patent and only one patent may be extended for any product based on FDA review delay.

The United States Patent and Trademark Office (“USPTO”), in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In addition to patent term extension under the Hatch-Waxman Act, patents in the United States may be granted additional term due to delays at the USPTO during prosecution of a patent application. We actively strive to maximize the potential for patent protection for our product and product candidates in accordance with the law. Patents Our technology platform, VYJUVEK, and our product candidates are primarily protected by composition of matter and methods of use patents and patent applications. A summary of granted composition of matter and/or methods of use patents that we own, which cover our technology platform, VYJUVEK, and our product candidates in the United States and elsewhere, is provided below.

Our Technology Platform Patent Number Country / Region * Patent Type Expiration Date ** Owner U.S. 10,441,614 United States Composition of Matter & Methods of Use – Delivery platform for targeted therapeutics, as well as methods of its use for delivering any effector to the skin 12/28/2036 Krystal U.S. 11,185,564 United States Methods of Use – Methods of use of replication-defective HSV vectors for delivering any effector to skin-targeted therapeutics 12/28/2036 Krystal 19 U.S. […]

Management’s Discussion and Analysis of Financial Condition and Results of Operations. The following information should be read in conjunction with the consolidated financial statements and related notes thereto included in this Annual Report on Form 10-K. In addition to historical information, this report contains forward-looking statements that involve risks and uncertainties. We encourage you to review the risks and uncertainties discussed in the sections entitled Item 1A. “Risk Factors” and “Forward-Looking Statements” included at the beginning of this Annual Report on Form 10-K. The risks and uncertainties can cause actual results to differ materially from those forecast in forward-looking statements or implied in historical results and trends.

We caution readers not to place undue reliance on any forward-looking statements made by us, which speak only as of the date they are made. We disclaim any obligation, except as specifically required by law and the rules of the U.S. Securities and Exchange Commission, or SEC, to publicly update or revise any such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements. This section of this Annual Report on Form 10-K generally discusses 2025, 2024 and 2023 items and year-to-year comparisons between 2025 and 2024, and 2024 and 2023 of the Company ’ s results of operations and cash flows.

Overview We are a fully integrated, commercial-stage, global biotechnology company focused on the discovery, development, manufacturing, and commercialization of genetic medicines to treat diseases with high unmet medical needs. Using our patented gene therapy technology platform that is based on engineered herpes simplex virus-1 (“HSV-1”), we create vectors that efficiently deliver therapeutic transgenes to cells of interest in multiple organ systems. The cell’s own machinery then transcribes and translates the transgene to treat the disease. Our vectors are amenable to formulation for non-invasive or minimally invasive routes of administration at a healthcare professional’s office or in the patient’s home. Our innovative technology platform is supported by two in-house, commercial scale Current Good Manufacturing Practice (“CGMP”) manufacturing facilities..

Refer to Part I, Item 1 - Business for more information about our commercial product, VYJUVEK ® , clinical development pipeline and research programs, and the status of our product candidates. Our Commercial Product VYJUVEK (beremagene geperpavec-svdt or B-VEC) VYJUVEK is a non-invasive, topical, redosable gene therapy approved in the United States, Europe, and Japan for the treatment of DEB, a rare and severe monogenic disease that affects the skin and mucosal tissues and is caused by one or more mutations in a gene called COL7A1 . VYJUVEK is designed to deliver two copies of the COL7A1 gene when applied directly to DEB wounds, providing the patient’s skin cells the template to make normal type VII collagen protein and thereby addressing the fundamental disease-causing mechanism.

We are commercializing VYJUVEK directly in the United States, major European markets, and Japan. We launched VYJUVEK in the United States in 2023, in Germany in August 2025, and in France and Japan in October 2025. The launch in France is under the post-marketing authorization early reimbursed access Accès Précoce program. Pricing negotiations are underway in both Germany and France and are expected to continue until at least the second half of 2026 in Germany and 2027 in France. Pricing negotiations were successfully completed in Japan prior to launch. We are advancing pricing discussions with Italian reimbursement authorities to enable a potential launch in Italy in the second half of 2026.

We are also preparing regulatory filings for the United Kingdom and Switzerland, as well as initiating pricing discussions with relevant authorities in other key Western European markets. The timing of additional European launches will depend on the cadence and outcomes of regulatory interaction and pricing negotiations. We continue to expand our specialty distributor network to support the commercialization of VYJUVEK in territories outside of the United States, major European markets, and Japan. Net VYJUVEK product revenue was $389.1 million for the year ended December 31, 2025. Since launch in August 2023, we have reported cumulative net product revenue of $730.3 million. Gross margin for the year ended December 31, 2025 was 94%.

We define gross margin as product revenue, net less cost of goods sold expressed as a percentage of product revenue, net. […]

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