Good morning. My name is Angela, and I will be your conference operator today. At this time, I would like to welcome everyone to Harmony Biosciences' Fourth Quarter and Full Year 2025 Financial Results Conference Call. [Operator Instructions] Please be advised that today's conference may be recorded. [Operator Instructions] I will now turn the call over to Matthew Beck from Astr Partners. Please go ahead.

Thank you, operator. Good morning, everyone, and thank you for joining us today as we review Harmony Biosciences' fourth quarter 2025 financial results and provide a business update. Before we start, I encourage everyone to go to the Investors section of our website to find the materials that accompany our discussion today, including a reconciliation of our GAAP to non-GAAP financial measures. At this stage of our life cycle, we believe the non-GAAP financial results better represent the underlying business performance. Our speakers on today's call are Dr. Jeffrey Dayno, President and CEO; Adam Zaeske, Chief Commercial Officer; Dr. Kumar Budur, Chief Medical and Scientific Officer; and Sandip Kapadia, Chief Financial and Administrative Officer. As a reminder, we will be making forward-looking statements today, which are based on our current expectations and beliefs. These statements are subject to certain risks and uncertainties. Our actual results may differ materially, and we undertake no obligation to update these statements even if circumstances change. We encourage you to consult the risk factors referenced in our SEC filings for additional details. I would now like to turn the call over to our CEO, Dr. Jeffrey Dayno. Jeff?

Thank you, Matt. Good morning, everyone, and thanks for joining our call today. I want to start off by recognizing the entire Harmony team for another outstanding quarter and a remarkable year in 2025. Our fourth quarter results reflect strong, sustained execution and have positioned us to achieve blockbuster status for WAKIX this year. In Q4, we delivered $243.8 million in net product revenue, up from $201.3 million in the same period last year, driven by continued strong demand for WAKIX based on its broad clinical utility and ongoing executional excellence by our commercial team. Q4 '25 marked the third consecutive quarter with approximately 400-plus average patient adds, the first time in franchise history. This quarter's net patient adds brings us to approximately 8,500 average patients on WAKIX. With 80,000 diagnosed patients with narcolepsy, there continues to be a large market opportunity to support strong growth. For full year 2025, WAKIX generated $868.5 million in net product revenue, representing strong year-over-year growth and extending to 6 consecutive years of revenue growth and profitability. Looking ahead to 2026, we are guiding WAKIX' net revenue to blockbuster status of $1 billion to $1.04 billion for the first time in franchise history, underscoring the durability of the WAKIX brand and the strength of our commercial engine. On the IP front, we have made good progress towards the goal of securing the WAKIX franchise. We recently settled with 3 generic filers, resulting in us having settled with 6 of the 7 ANDA filers. Based on these settlements, generic entry would occur no sooner than March of 2030 if we are granted pediatric exclusivity, which we are on track to obtain. As for last week's trial, we remain confident in the strength of our IP, and we'll continue to vigorously defend it as the legal…

Thank you, Jeff. 2025 marked a year of unprecedented and record-setting performance for WAKIX and that performance continued in the fourth quarter. In Q4 of 2025, WAKIX continued its remarkable trajectory with the third consecutive quarter of approximately 400 or more average patient adds. The first time this has been achieved in the history of the franchise. This level of sustained momentum speaks directly to the strength of the brand and the consistency of our execution. What's driving this performance is clear. WAKIX maintains a unique, highly differentiated position as the only non-scheduled treatment option, which continues to fuel broad clinical adoption. Brand awareness, perceived efficacy, tolerability and stable payer coverage remain exceptionally strong. And we've sharpened our commercial fundamentals from field deployment and call planning to refine messaging, targeted promotion, new payer wins and better patient support processes that shorten time to dispense and boost conversion. The compelling value proposition of WAKIX combined with continued strategic adjustments and strong operational execution are delivering results, giving us confidence heading into 2026. In addition, right now, we are expanding our field-based teams by almost 20% across our field sales, field reimbursement and remote sales teams, and we've already made progress in hiring for these roles. This investment will increase our presence in the market and demonstrates confidence in our continued growth. We will launch a new online portal to enable easier and faster access for patients, and we're continuing to deploy process improvements to further improve time to dispense and success rate, and we'll continue to look for opportunities for additional improvements and efficiencies moving forward. We're also extremely excited about the recent FDA approval of WAKIX for the treatment of cataplexy in pediatric patients 6 years of age and older with narcolepsy. This approval further demonstrates the clinical value of…

Thank you, Adam. Good morning, everyone, and thank you for joining us today. Q4 2025 capped a year of significant scientific and clinical progress for Harmony, and we are entering 2026 with one of the most robust late-stage CNS pipelines in the industry. We now have 5 ongoing Phase III registrational clinical trials across 5 distinct CNS indications underscoring the breadth and depth of our development programs. I'll start with updates for our Sleep/Wake franchise. I'm pleased to highlight a new indication for WAKIX that the FDA approved on February 13. The FDA approved WAKIX for cataplexy in patients 6 years of age and older. This is another important milestone for WAKIX, and it is now approved for both excessive daytime sleepiness and cataplexy in adults and children 6 years of age and older. This approval also advances our efforts towards achieving pediatric exclusivity for WAKIX, which is an additional 6 months of regulatory exclusivity at the back end of the longest pattern for WAKIX. The data from the ongoing Phase III study in Prader-Willi syndrome, the TEMPO study is the other requirement for pediatric exclusivity, and we are on track for the top line data from the TEMPO study in the second half of this year. Across our next-gen pitolisant program, pitolisant GR continues to advance as a fast-to-market strategy after demonstrating bioequivalence to WAKIX in a pivotal bioequivalent study and has the ability to initiate treatment at the therapeutic dose range at 17.8 milligram, eliminating the need for titration, which is an important differentiation. We remain on track for an NDA submission in Q2 2026 and target PDUFA in Q1 2027. Pitolisant HD, our enhanced formulation with an optimized PK profile and a higher dose remains on track for top line data in 2027 and PDUFA in 2028.…

Thank you, Kumar, and good morning, everyone. This morning, we issued our fourth quarter earnings release and filed our 10-K, where you'll find the details of our fourth quarter and full year 2025 financial and operating results. Our financial performance is also shown on Slides 15 through 17. We finished the year with great momentum across the business, delivering strong growth across several of our key metrics, positioning us well as we head into 2026. We delivered another year of double-digit top line growth as we reported net revenues above the top end of our previous guidance range. We continue to be a profitable cash-generating company, funding the growth and advancement of our pipeline fully with the strength of our balance sheet. Our strong financial performance, combined with a solid balance sheet, including approximately $882.5 million in cash, cash equivalents and investments positions us well as we continue to invest in the advancement of our robust late-stage pipeline and look for additional value-enhancing opportunities to further build out our pipeline and add to our commercial portfolio. We reported net revenues of $243.8 million for the fourth quarter of 2025 compared to $201.3 million in the prior year quarter, representing a growth of 21% and also our highest quarterly revenues to date. Performance in the quarter reflects the sustained strong underlying demand for WAKIX. We also reported total operating expenses for the fourth quarter of $136.7 million compared to $91.1 million for the same quarter in 2024. The growth in expenses was related to investments in our R&D to advance our late-stage pipeline, investments in the commercialization of WAKIX and narcolepsy as well as ANDA litigation and settlement expenses during the fourth quarter of 2025. Non-GAAP adjusted net income for the fourth quarter of 2025 was $33.4 million or $0.57 per…

Thank you, Sandip. In closing, I'm incredibly proud of what the Harmony team accomplished in 2025, but that is behind us, and we are now focused on 2026 and excited for what is ahead. Growth of the WAKIX franchise, guiding WAKIX to blockbuster status in 2026, extending the WAKIX franchise with pitolisant GR's target PDUFA date in Q1 2027, expanding the pitolisant franchise with the advancement of the Phase III trials with pitolisant HD in unique orphan rare CNS indications; a new opportunity to explore broader CNS indications with newly licensed IP and a new formulation of pitolisant and advancing our robust late-stage pipeline with 5 ongoing Phase III registrational trials toward 5 distinct CNS indications. It is the cost of these achievements that we continue to operate from a position of strength and drive significant momentum. This momentum reinforces our confidence that we have built something rare in this industry, a profitable, self-funding biotech company with a strong balance sheet, blockbuster commercial product, a pipeline positioned to deliver significant long-term value and the capacity, experience and commitment to generate even greater value through the pursuit of smart business development opportunities. Thank you, and I will now turn the call back over to the operator for Q&A. Operator?

[Operator Instructions] We'll take our first question from Pete Stavropoulos with Cantor Fitzgerald.

Actually, I'm going to go to one of your earlier-stage assets, EPX-100 for Dravet and the clinical data disclosed at AES in December. Can you just comment on the baseline seizure rates and the baseline antiseizure med use? How do they sort of compare to the real-world patients? And then how do you compare to patients in other Dravet clinical trials? And with the interim OLE efficacy and safety data in hand for those that have at least 6 months of exposure, what's your view on the emerging benefit risk profile? How competitive do you believe the emerging profile is? And where do you see it fitting into the current landscape?

Pete. Thanks for your question, and I'll turn it over to Kumar to respond.

Thank you for the question. These patients who participated in our Dravet syndrome study had treatment-resistant seizures. They were, on an average, approximately about 4 antiseizure medicines. And their baseline seizures, I don't remember the exact number what the baseline seizure was, but I can provide that information, but that was comparable to what we have seen in other studies as well. In terms of the value proposition, Pete, I mentioned on the call, the efficacy that we saw in this study. The effectiveness data showed that we had at least about approximately 50% median reduction in seizures. And we also saw 50% reduction in seizures in about 50% of these patients. What's important is to see this alongside the safety and tolerability profile. We did not see significant nausea, vomiting, abdominal pain, diarrhea, that is commonly seen with other medicines, including suppression of appetite. In fact, the only GI, AE of note was diarrhea, which was seen in about 2% of the patients. Liver function tests also remain normal, which is an issue with some of the approved drugs. And EPX-100 doesn't require any special monitoring. And also the ease of use is also very important here. Our liquid formulation BID dosing regimen is much more better suited in this patient population for patients and caregivers compared to some of the other drugs that are in development, which have a TID dosing regimen. Thank you, Pete.

Thanks, Kumar.

And one follow-up, if okay. A question on the orexin-2...

Go head, Pete.

Can you hear me?

Yes.

Yes. So for the orexin-2 receptor agonist, you're going to have data midyear-ish. What's the PK/PD and safety bar that you look for in the Phase I to move this program into later-stage studies? And where do you sort of see your orexin-2 receptor agonist fitting into the emerging landscape?

Yes. We are dosing the -- sorry, we are dosing subjects right now in our Phase I PK study. By mid-2026, we will see clinical PK data, safety and tolerability data. We don't anticipate to see anything different than what is already seen with other orexin receptor agonist in this class. And we are making progress on advancing this to the next stage of development, which is sleep-deprived healthy volunteer study, we plan to commence in the second half of this year. And in terms of how it fits with the competitive landscape, look, Takeda is ahead. They have submitted an NDA, and the others are in Phase I and Phase II studies. And our goal is to really accelerate the clinical development by leveraging some of the learnings that we have from other development programs that are ahead of us without compromising the quality of data.

Congrats on the quarter.

Thanks, Pete.

Thanks, Pete.

And we'll move next to David Amsellem with Piper Sandler.

Two for me. One on the orexin, I just wanted to clarify, are we going to get multiple ascending dose data in the second half in sleep-deprived healthies? And how are you thinking about indications here given that you have a number of companies that are looking at narcolepsy and IH? Are you thinking beyond narcolepsy and IH? Or is that going to be your core focus for the orexin program? That's number one. And then number two, sort of a hypothetical here, but to the extent that with the patent case, if you were to not prevail and there was an earlier-than-expected loss of exclusivity, how do you think about cash conservation and ultimately trying to bridge from the LOE to your next set of development stage assets and commercialization of them?

David, thanks for your questions. With regards to the orexin-2 agonist, just to comment. In terms of target indications, I think we're contemplating broadly in addition to the primary targets in terms of our overall orexin-2 program, other opportunities beyond primary disorders of hypersomnolence. So I think that is part of an overall development strategy. With regards to the emerging data, first, I just want to clarify, in terms of the PK profile, in healthy volunteers, single-dose study, we are looking to confirm the expected profile of once-daily dosing, with regards to the initial data that will read out. And Kumar multiple ascending dose on sleep-deprived healthy volunteers?

Yes. The single -- the multiple ascending dose study, David, will follow the single ascending dose study. And in parallel, we plan to conduct a sleep-deprived healthy volunteer study. In terms of the indications, as Jeff was mentioning, we are keeping an open eye and looking at everything, not just central disorders of hypersomnolence, but other potential neuropsychiatric disorders, including several aspects of cognition, mood and other things. We will pursue single-ascending, multiple-ascending dose study because that's something that we need to do regardless. And then we will evaluate the competitive landscape and decide which way to go.

And David, with regard to your second question, with regards to the ongoing litigation. I think as you're aware, I think it's premature. I'm not going to speculate on the future outcome of the trial. But I'd point you to the recent progress that we made in settling with 3 of the generic filers. So that currently, it brings the total number of settlements to 6 of the 7 ANDA filers. We feel good about how that positions us going forward. Based on these settlements, generic entry stands at March of 2030, if we're granted pediatric exclusivity, which we're on track to obtain. With regards to our cash position and how we stand, I'll ask Sandip.

Yes. Look, I think we're in a very strong cash position. You saw we generated close to $348 million cash last year. We have $880 million of cash on the balance sheet. So I think we're really well positioned to continue to drive innovation, but -- to build our pipeline and be able to fund many -- of all the programs that we spoke about today generally. And we continue to have a solid position as a company.

We'll move next to Jay Olson with Oppenheimer.

Congrats on the progress. Can you talk about any gating factors to filing the pitolisant GR NDA next quarter? And then separately, can you just talk about the pace of enrollment in your Phase III narcolepsy and IH studies for pitolisant HD, considering you've got some competitors also enrolling their studies?

Jay, thanks for your question. We're excited about pitolisant GR. It's sort of right around the corner in terms of NDA submission. Kumar, any gating items to that or how are things looking?

Nothing. Things are looking good. We are on track to submit the pitolisant GR NDA in second quarter of this year. As always, the final things that are needed for NDA submission, that's what we are working on. And we are on target for PDUFA in Q1 of 2027. In terms of your question regarding the enrollment for pitolisant HD in narcolepsy and idiopathic hypersomnia studies, you're absolutely right, Jay. There is a competition for patients. We are very much aware of it. But we also have been in this field for a long time. We know the sites; we know the investigators. We have conducted studies in this patient population. So we are confident with our current time line, which is top line in 2027 and PDUFA in 2028.

Yes. Thanks, Kumar.

Great. And with regard to the...

Yes. Sure. With regards to pitolisant GR, I just want Adam to comment on how he sees the opportunity and how the commercial team is preparing for that.

Great. Thanks, Jeff. Preparation is definitely underway, looking for PDUFA in 1Q '27, that will have us launching several years before LOE with an opportunity to extend the WAKIX franchise. This is a fast-to-market line extension strategy that provides a GR coding to pitolisant and allows patients to start right at the therapeutic dose. So another layer of additional protection for a product that's already perceived is highly well tolerated and the addition of starting at a therapeutic dose, which has hopefully the benefit of securing faster patient outcomes. The strategy here is really focused on new patients that would have been prescribed WAKIX as well as previous patients that we have the ability to recontact because we secure consent right upfront anytime there's a patient referred for WAKIX therapy. Both of those are tremendous opportunities, and we look forward to executing on that launch beginning in 1Q ' 27 next year.

We'll take our next question from Graig Suvannavejh with Mizuho.

This is Ryan on for Greg today. A couple of quick questions for me. I'm wondering if you could comment on the increase in SG&A that we saw in the fourth quarter, the dynamics behind that? And then any updates that you might have on EPX-200 and when we might hear more about that program?

Okay. Sandip?

Yes. Just regarding the expenses in the fourth quarter, I mean, as I mentioned on the call, I mean, we did see an increase in expenses, largely driven by the R&D investments as we start up our Phase IIIs for both IH and narcolepsy in the HD program, continued cost in terms of investments for WAKIX in narcolepsy commercialization there. And then I also mentioned that we did have ANDA litigation and settlement expenses in the fourth quarter. So that the team could be prepared for the trial, which happened a few days ago as well. So again, those are the key drivers for our expenses. And as I mentioned, going forward, I think the key thing to note in terms of expenses is as we'll have 5 registrational studies ongoing this year and potentially 6 ones planned for later this year, we will see some increases also in the R&D expenses as we go into 2026.

Thanks, Sandip. Kumar?

Regarding liquid lorcaserin, which is EPX-200, we are doing some pre-IND-related work right now. Ryan, as you know, lorcaserin is more selective for 5-HT2B. And this drug probably has one of the largest safety and tolerability database out there, including a long-term cardiovascular outcome study. And also there is a lot of efficacy data in several DEEs with this compound. Our goal is to leverage all of the data that is already available and pursue an accelerated development program and hopefully bring a new medication to patients with Development and Epileptic Encephalopathies.

Thanks, Kumar.

And we'll go next to Danielle Brill with Truist Securities.

This is Alex on for Danielle. Two little detailed questions. One follow-up on Jay's question on ONSTRIDE 1 and 2. Have those begun enrolling patients? Just we haven't seen any indication in [ clintrials.gov ]. And then on the OpEx expenditure, you mentioned the impact of some of the settlements and litigation. Was that primarily in the general and administrative line item? Just kind of curious how that run rate we should expect moving forward?

Okay, Kumar?

ONSTRIDE 1 and 2 studies, as we have mentioned in the past, we started initiating sites towards the end of last year, and it will be posted on clinicaltrial.gov, typically within 21 to 30 days after the first subject is enrolled. We are at different stages of site initiation, site activation, sites are getting prepared to enroll the patients.

Yes. And regarding the expenses, yes, most of them -- they were all under G&A in terms of the ANDA litigation and settlement expenses. Some of it tend to be onetime expenses and some will continue as we kind of continue with the litigation process.

We'll move next to Corinne Johnson with Goldman Sachs.

Maybe I know you can't speak too much about the details of ongoing litigation, but you could help us understand kind of the time line for decisions that are expected next, what process you kind of could anticipate for appeal for a situation like this? And also kind of remind us the regulatory exclusivity time lines that you have? And then I know you've talked about the litigation or the settlements you have kind of with 6 of 7 of these other generic manufacturers. But can you clarify what the impact this litigation might have on potentially like acceleration clauses in those settlements? I think those are pretty standard, but not sure if they're included here.

Yes, Corinne, thanks for your question. So with regards to the timing of the judge issuing a rule, it's really -- it's hard to know and can't really speculate. This is an ongoing legal process. And it's hard to know when that will complete and come to final decision. As a reminder, there is -- in the meantime, there is a stay that's in place that extends to February of 2027. And then based on the outcome of the trial, obviously, an appeals process is available to both sides. I think we know that the litigation process as well as the appeals process takes time. And with that, while this was happening, again, I think pointing back to the progress we've made on the settlements in terms of 6 of the 7 generic filers being settled, we feel that positions us well going forward with regards to the overall process. In the meantime, there are other things going on with regards to -- as we just spoke to, pitolisant GR and extending the franchise. And that's -- we remain -- with regards to last week's trial, we remain confident in the strength of the IP, and we will continue to vigorously defend it as the legal process plays out after the trial. Kumar, in terms of regulatory exclusivities? So in terms of our regulatory exclusivities of where we are with regards to -- I mean, ODE with regards to EDS takes us to March of '26 and for cataplexy to October '27.

And we'll take our next question from Patrick Trucchio with H.C. Wainright.

Just a couple of clarification questions and then a follow-up. First, I think you reiterated 2026 WAKIX guidance of $1 billion to $1.04 billion. What level of average patient growth is embedded in that range? And how much incremental contribution do you expect from the newly approved pediatric cataplexy indication in 2026?

Patrick, thanks for your question. Adam, what -- respond to the patient growth supporting that?

Yes. Thanks for the question. So for 2026 guidance, exceeding basically $1 billion or blockbuster status. The underlying patient growth is consistent with what we've seen this year. So we expect that momentum to continue. We're really excited to see the third consecutive quarter of more than 400 patient adds in the quarter. We've never seen that before in the brand. We believe that's a strong foundation and momentum carrying us into '26, and we expect that to continue. You're going to see the regular and normal seasonality that you're going to -- that we've seen over the last several years. Q1 tends to be a little bit slower as the start of the calendar year with payer resets and what have you. So we expect that seasonality to continue. But the underlying sort of average performance, we'd expect to continue the momentum we saw in 2025. Hopefully, that covers the question.

Yes. That's helpful. And then just as it regards to the broader CNS strategy with MS fatigue, I'm wondering, first, can you elaborate on what existing clinical data supports pitolisant's efficacy in fatigue? And what's the development time line for your Phase I -- what is the development time line for the Phase I PK study?

Patrick, regarding this new formulation, this is something we are very excited about. It's a new formulation with an issued patent until 2042. We have mentioned in the past about our interest to pursue fatigue based on the histaminergic mechanism of action. We have also said that fatigue is not an any-idimensional construct. It's a multidimensional construct with physical, somatic and cognition symptoms. And how pitolisant with its unique mechanism of action working at tuberomammillary nucleus and the downstream effects on serotonin and norepinephrine is uniquely positioned to treat fatigue. To your question about clinical data, Patrick, we actually showed the efficacy data in fatigue with pitolisant in our myotonic dystrophy study, where we saw clinically meaningful improvement in symptoms of fatigue, and we also saw a dose response. Similarly, we also saw clinical efficacy data in fatigue in patients with residual exclusivity and sleepiness with OSA. So on with all of these data points, we plan to pursue broader CNS indications where fatigue is a prominent symptom, and we have identified fatigue in MS as a lead indication because it's very well characterized very well-known and about 80% of patients with MS have fatigue with more than 50% having clinically significant fatigue. In terms of where we are with the development program, right now, the focus is on formulation optimization and looking at potentially other modes of delivery and prepare for a PK study, clinical PK study. That's where we are. Thank you.

Great.

And if I could just jump in, I neglected to answer the second part of your question around the pediatric cataplexy opportunity. So just a quick couple of words on that. We're really excited about the approval of pediatric cataplexy. We now have approval for EDS and cataplexy in both adult and pediatric populations, basically anyone over 6 years of age. The pediatric patient population represents about 5% of the total narcolepsy population, just to give you an idea around scale of the opportunity. But really, we see this as -- look, this is an important addition to the label. It provides greater flexibility for health care providers and their ability to treat these patients. It's important new information that we will educate those health care providers on. And it -- I think reinforces WAKIX as an appropriate treatment for peds as well as having just broad clinical utility across almost all patients with narcolepsy. So our teams are really well prepared ahead of the approval. As I mentioned, we had a robust promotional and execution strategy ready to go, and we began executing on those plans really from the day of approval. Thank you for the question.

We'll go next to Jason Gerberry with Bank of America.

This is Pavan Patel on for Jason Gerberry. Just a couple of questions for us. The first is, I know you guys mentioned expanding the field sales and reimbursement teams in 2026. So maybe if you can just help us understand how much of this investment is dedicated to the core in narcolepsy market versus preparing for new launches like pitolisant GR in the future? And then the second question is with regards to BD. Maybe if you can speak to the BD as a capital allocation priority versus share repurchases or other things and how you're planning to diversify beyond the pitolisant franchise ahead of an important IP outcome, providing clarity on the full commercial asset.

Yes. I didn't catch the first part of the question, if you could repeat that.

I did.

Yes. Why -- yes, go ahead.

Okay. Adam, go ahead.

Yes. The first part of the question was around the expansion. What does that look like and how much of that is related to core growing -- basically growing WAKIX versus preparing for GR. I mean the short answer on that last piece is 100% of the investment expansion is around continuing to grow WAKIX today. Our plans for how we will launch GR will take form kind of as we progress through the calendar year this year and approach that PDUFA date in 1Q '27. I'll remind that we were really pleased with the performance we saw in '25, really record-setting performance. And that was based on continuing to tweak some of the fundamentals around our sales execution, marketing promotional mix and messaging, adding some payer wins and supporting patients. As we enter '26, we triggered an expansion of our field-based teams. That's what you were asking about. Overall, it's about a 20% increase in total field-based personnel. So we see full increase in our share of voice. Also gives us the opportunity to rebalance territories that we want to do about every 18 months to 2 years. With our field sales teams, we're seeing that expansion more than 10%, field reimbursement more than 50%, our remote sales teams more than 10%. So it's really meaningful, and we're excited about that opportunity. We've posted those roles. We're already in the process of hiring. We've already identified several of those candidates. So we expect those folks to be in place by the end of this quarter. That's our plan. Thanks for the question.

Thanks, Adam. And with regard to the second question on business development, business development remains a high priority for us, obviously, with a very strong balance sheet, and we want to deploy that capital and invest in the business. As we said, the sweet spot, the focus continues to be orphan rare CNS opportunities, late-stage development as well as commercial on market. We have the capacity to do that. Obviously, we have a strong commercial engine. We'd like to build out the commercial portfolio. Dedicated business development team and we're also looking -- and we've said this before, adjacencies, broader CNS indications. Obviously, we shared today a new opportunity that we're very excited about based on newly licensed IP with a new formulation of pitolisant where we see a significant opportunity around fatigue and broader CNS populations. So we are focused and committed to those efforts, deploy our capital towards business development. Sandip, any thoughts on capacity?

Yes. Look, I think we're in a very strong position. We have over $880 million in cash on the balance sheet as of last quarter. And just to your question, I mean, not only obviously, we're looking at business development, but of course, we also have $150 million capacity on the share buyback. So we're always looking at opportunities to drive value for shareholders and that's something that we think we have the optionality as a company as to move forward there.

We'll go next to So Youn Shim with UBS.

Congrats on the great year. I have 2 questions, if I may. First, so it seems like the settlement for generic entry with the 3 additional ANDA filers are now 4 months early, March 2030, if pediatric exclusivity is granted from the prior settlement agreement of July '30 -- July 2030. So I just wanted to check if I'm understanding it correctly. Does it mean without the pediatric exclusivity, the generic entry would start no earlier than September 2029 now? And my second question is on Prader-Willi syndrome indication for WAKIX. So the Phase III reading out second half of this year, potential PDUFA in 2028. Here, I was wondering what are you envisioning opportunities from the PWS? It would support the pediatric exclusivity for WAKIX and delay generic entry too. But on just the PWS indication itself, the runway would just be about 2 years from launch if approved. Are you thinking of trying the PWS with the pitolisant HD as well?

So Youn, thanks for your questions. With regards to your first one about the timing of the settlement, you are correct in terms of without the pediatric exclusivity market entry would be September 2029. But we are on track, making very good progress towards pediatric exclusivity, which would take it to March of 2030. One of the important components of that, obviously, after the peds narcolepsy data is the Prader-Willi program, both for potential indication. But the larger market opportunity, I think, as you're aware, is the 6 months extension with the peds exclusivity. Kumar, further thoughts on that?

Yes. With -- So Youn. With PWS in the U.S. alone, there are approximately 15,000 patients with Prader-Willi syndrome. About half of these patients have significant excessive daytime sleepiness for which there are no drugs approved. So if we are successful with this study, we will go for an indication really addressing high unmet need in this patient population. And in terms of pitolisant HD being a potential option to pursue PWS, that's not how we are thinking right now, but that option is always open to us. Thank you.

And we'll take our next question from David Hoang with Deutsche Bank.

So maybe on the new pitolisant formulation, could you talk a little bit about what characteristics and profile you expect to see with that product? How is it different from, let's say, pitolisant HD? And are there characteristics that lend itself to MSLT related conditions? And then maybe a second question just around the IP estate for some of these life cycle management products. So could you just summarize again for us the IP that you either currently have or expect to obtain for pitolisant GR, HD and then the new formulation?

Kumar, it's on the new opportunity.

Yes. David, thanks for the question. Regarding the new formulation, as we evaluated this opportunity, there might be some potential options for us with this new formulation that could potentially differentiate itself in terms of the PK parameters that probably will lend itself better for the treatment of fatigue in larger indications. Obviously, once we complete the human PK study, that's when we will get to know how exactly this will play out in humans, and that will help us determine the next step. But for now, we are really excited about this particular formulation because, as I mentioned earlier to the other question, this is a very unique opportunity for us to pursue fatigue in a broader CNS indication.

And David, in terms of your second question about the IP estate, just briefly as a reminder, pitolisant GR and pitolisant HD utility patents filed out to 2044. This new formulation of pitolisant and the opportunity there is actually an issued patent that we have a license to out to 2042. So formulation work continues on. As Kumar mentioned, the potential of other modes of administration, looking at the potential some of these patient populations where there's swallowing dysfunction and other methods of delivery, but an issued patent out to 2042.

And we'll take our last question from Ami Fadia with Needham & Company.

This is Poorna on for Ami. Are there any recent updates for the enrollment from the ARGUS and the LIGHTHOUSE studies? And just in case I missed this, what are the targets for the recent sales force expansion? And when do you see that impact coming through?

Poorna, ARGUS and LIGHTHOUSE study, they continue to enroll, and we continue to make progress. We are on track for top line data in the first half of 2027 and PDUFA in 2028.

And the second question, just to clarify.

Just want to understand when do you see the impact from the sales force expansion coming through?

Adam.

Yes. Thank you, Ami. And there was a question around the targets as well. We did add some targets, but let's say it was about 5%. So not a huge add. It's really improving our share of voice and rebalancing territories targeted at the existing target base that we've been targeting for some time. And when would we expect to see that impact? Obviously, we -- as I mentioned, we'd like to get those folks on board and in place by the end of this quarter. And so from the impact standpoint, I guess you would expect to see the impact from that point forward.

Thank you. I'm showing no further questions. I would now like to turn the call back over for any closing remarks.

Thank you, operator, and thanks, everyone, for joining our call this morning for your interest in Harmony Biosciences, and have a great rest of your day. Thank you.

This does conclude today's Harmony Biosciences fourth quarter and full year 2025 financial results conference call. You may now disconnect your lines, and have a wonderful day.