Longboard Pharmaceuticals to Host Investor & Analyst Event in New York on October 11, 2023

Longboard Pharmaceuticals, Inc. (Nasdaq: LBPH), a clinical-stage biopharmaceutical company focused on developing novel, transformative medicines for neurological diseases, today announced that it will host an Investor & Analyst Event focused on the Developmental and Epileptic Encephalopathy (DEE) landscape and LP352, a first-in-class 5-HT2C receptor superagonist in development for the potential treatment of seizures associated with DEEs.

The event will feature DEE thought leaders who will discuss the unmet medical need and current and emerging treatment landscape for people living with refractory epilepsies.

The Longboard Pharmaceuticals team will discuss the opportunity within the DEE landscape and the ongoing Phase 1b/2a PACIFIC Study evaluating LP352 as a potential treatment of seizures associated with a broad range of DEEs. The PACIFIC Study is fully enrolled, and topline data are expected around year-end 2023.

A live question and answer session will follow the formal presentations.

EVENT DETAILS:

WHEN: Wednesday, October 11, 2023 | 9:30 – 11:30 AM ET

WHERE: Cooley LLP, 55 Hudson Yards, New York, NY 10001

REGISTRATION LINK (both in-person and virtual*): https://lifescievents.com/event/longboard/

*In-person attendance is limited to invited research analysts and institutional investors only. All other guests are invited to view the live or archived webcast virtually on the Investor Relations section of Longboard’s website at https://www.longboardpharma.com/. The archived webcast will be available for at least 30 days following the event.

ABOUT LP352

LP352 is an oral, centrally acting, 5-HT2C superagonist in development for the potential treatment of seizures associated with DEEs such as Lennox-Gastaut syndrome, Dravet syndrome, SCN2A-related epilepsies, CDKL5 deficiency disorder, and other epileptic disorders. LP352 is designed to modulate GABA and, as a result, suppress the central hyperexcitability that is characteristic of seizures. LP352 has novel chemistry and attributes, and was designed to be highly specific and selective for the 5-HT2C receptor subtype, giving it the potential to reduce seizures in patients with DEEs while overcoming the known or perceived safety limitations of available drugs in the 5-HT2 class. LP352 is currently being evaluated in a Phase 1b/2a clinical trial (the PACIFIC Study) in participants with DEEs, with topline data expected around year-end 2023, as well as in additional supportive studies.

ABOUT THE PACIFIC STUDY

The PACIFIC Study is a Phase 1b/2a clinical trial evaluating participants with DEEs. The primary objectives of the study are to assess the safety and tolerability of LP352. The PACIFIC Study will also evaluate change in seizure frequency over the treatment period. The study enrolled 52 participants with a variety of treatment resistant seizures that fall into the category of DEE across approximately 30 study sites in the United States and Australia. The PACIFIC Study data are expected to inform the design and characteristics of the planned Phase 3 program for LP352. Participants who complete the PACIFIC Study are eligible to roll over into the ongoing open-label extension (OLE) trial should they choose to do so. The OLE is a Phase 2 multicenter, open-label, multiple-dose, long-term extension clinical trial designed to evaluate long-term safety of LP352 in participants with DEEs who have completed the PACIFIC Study.

ABOUT LONGBOARD PHARMACEUTICALS

Longboard Pharmaceuticals, Inc. is a clinical-stage biopharmaceutical company focused on developing novel, transformative medicines for neurological diseases. Longboard is working to advance a portfolio of centrally acting product candidates designed to be highly selective for specific G protein-coupled receptors (GPCRs). Longboard’s small molecule product candidates are based on more than 20 years of GPCR research. Longboard is evaluating LP352, an oral, centrally acting 5-hydroxytryptamine 2C (5-HT2C) receptor superagonist, with no detectable activity on 5-HT2B and 5-HT2A receptor subtypes, in development for the potential treatment of seizures associated with a broad range of Developmental and Epileptic Encephalopathies. Longboard is also evaluating LP659, an oral, centrally acting, sphingosine-1-phosphate (S1P) receptor subtypes 1 and 5 modulator, which is in development for the potential treatment of multiple neurological diseases.

FORWARD-LOOKING STATEMENTS

Certain statements in this press release are forward-looking statements that involve a number of risks and uncertainties. In some cases, you can identify forward-looking statements by words such as “will”, “potential”, “emerging”, “opportunity”, “expected”, “designed to”, “focused on”, “working to”, or the negative, plural or other tenses of these words or other comparable language, and they include, without limitation, statements about the following: Longboard’s participation in the upcoming Investor & Analyst Event; anticipated timing of topline data for the PACIFIC Study; LP352, including its potential to treat seizures associated with a broad range of DEEs, its potential to reduce seizures in patients with DEEs while overcoming the known or perceived safety limitations of available drugs in the 5-HT2 class, and its selectivity, design, chemistry, and attributes; the opportunity within the DEE landscape; and Longboard’s clinical and preclinical programs and product candidates, ability to develop product candidates and deliver medicines, and focus. For such statements, Longboard claims the protection of the Private Securities Litigation Reform Act of 1995. Actual events or results may differ materially from Longboard’s expectations. Factors that could cause actual results to differ materially from those stated or implied by Longboard’s forward-looking statements include, but are not limited to, the following: Longboard’s product candidates, including LP352, are in the early to middle stages of a lengthy research, development, and regulatory review process, the timing, manner and outcome of which is uncertain, and Longboard’s product candidates may not advance in research or development or be approved for marketing; nonclinical and clinical data is voluminous and detailed, and regulatory agencies may interpret or weigh the importance of data differently and reach different conclusions than Longboard or others, request additional information, have additional recommendations or change their guidance or requirements before or after approval; results of clinical trials and other studies are subject to different interpretations and may not be predictive of future results; topline data may not accurately reflect the complete results of a particular study or trial; enrolling participants in Longboard’s ongoing and intended clinical trials is competitive and challenging; other risks related to the development and commercialization of Longboard’s product candidates; risks related to Longboard’s limited operating history, financial position and need for additional capital; Longboard will need additional managerial and financial resources to advance all of its programs, and you and others may not agree with the manner Longboard allocates its resources; macroeconomic events stemming from the COVID-19 pandemic or evolving geopolitical developments such as the conflict in Ukraine, including but not limited to the impact on Longboard’s clinical trials and operations, the operations of Longboard’s suppliers, partners, collaborators, and licensees, and capital markets, which in each case remains uncertain; risks related to unexpected or unfavorable new data; risks related to relying on licenses or collaborative arrangements; other risks related to Longboard’s dependence on third parties; competition; product liability or other litigation or disagreements with others; government and third-party payor actions, including relating to reimbursement and pricing; risks related to regulatory compliance; and risks related to Longboard’s and third parties’ intellectual property rights. Additional factors that could cause actual results to differ materially from those stated or implied by Longboard’s forward-looking statements are disclosed in Longboard’s filings with the Securities and Exchange Commission (SEC). These forward-looking statements represent Longboard’s judgment as of the time of this release. Longboard disclaims any intent or obligation to update these forward-looking statements, other than as may be required under applicable law.

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