Thank you for standing by. My name is Liz and I'll be your conference operator today. At this time, I would like to welcome everyone to the Ironwood Pharmaceuticals First Quarter 2026 Investor Update Conference Call. All lines have been placed on mute to prevent any background noise. After the speaker's remarks, there will be a question and answer session. If you would like to ask a question during this time, simply press star followed by the number one on your telephone keypad. If you would like to withdraw your question, press star one again. Thank you. I would now like to turn the call over to Greg Martini, Chief Financial Officer. Please go ahead.

Good morning, and thank you for joining us for our first quarter 2026 investor update. Our press release issued this morning can be found on our website. Today's call and accompanying slides include forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve risk uncertainties that may cause actual results to differ materially. A discussion of these statements and risk factors is available on the current Safe Harbor Statement slide, as well as under the heading Risk Factors in our annual report on Form 10-K for the year ended December 31, 2025, and in our subsequent SEC filings. All forward-looking statements speak as of the date of this presentation, and we undertake no obligation to update such statements. All also included are non-GAAP financial measures, which should be considered only as a supplement to, and not a substitute for, or superior to, GAAP measures. To the extent applicable, please refer to the tables at the end of our press release for reconciliations of these measures to the most directly comparable GAAP. During today's call, Tom McCord, our Chief Executive Officer, will begin with a brief overview. Tammy Gaskins, our Chief Commercial Officer, will provide a commercial update, including discussion of the commercial opportunity for apraglutide in short bowel syndrome with intestinal failure. Mike Schetzlein, our Chief Medical Officer, will discuss our pipeline, and I will review our financial results and guidance. Today's webcast includes slides, so for those of you dialing in, please go to the events section of our website to access the accompanying slides separately. With that, I'll turn the call over to Tom.

Good morning, everyone, and thanks for joining us today to review our first quarter 2026 financial guidance, results, and business updates. Earlier this year, we laid out our top priorities for 2026, which are maximizing Linzess, advancing ephroglutide, and delivering sustained profits and cash flow. We believe these priorities are key to achieving our goals of redefining standard of care for patients suffering from GI and rare diseases, while maximizing shareholder value. During the first quarter, we made significant progress on each of these priorities. First, Linzess, which continues to be the prescription leader for the treatment of irritable bowel syndrome with constipation and chronic idiopathic constipation, in its 14th year on the market. We reported an outstanding first quarter financial performance, with 97% year-over-year net sales growth for Linzess, driven primarily by improved net price and supported by 5% prescription demand growth. These first quarter results position us well to achieve our full year 2026 financial guidance, which will return Linzess to blockbuster status and will set a new all-time high for annual U.S. net sales for the brand since launch. We are also continuing to make progress in bringing LINZ-S to younger age groups. In the first quarter, the FDA accepted a supplementary new drug application for LINZ-S for the treatment of functional constipation in patients two to five years of age. The application received a priority review with a PDUFA target action date set for May 24, 2026. At present, Lenzus is the only FDA-approved drug for the treatment of children 7 years and older with irritable bowel syndrome with constipation and for children 6 to 17 years old for functional constipation. If approved, the indication in children 2 to 5 years old for the treatment of functional constipation would further broaden the clinical utility of Lenzus in younger age groups, and we look forward to hearing from the FDA in the coming weeks. Also in the first quarter, we advanced our STARS II confirmatory phase three clinical trial, assessing apiglutide for the treatment in patients with short bowel syndrome with intestinal failure, including completion of the clinical site feasibility, and we remain on track for the clinical site initiation in the second quarter. This past weekend, we had a chance to present findings at Digestive Disease Week meeting in Chicago from the landmark survey, which underscored the need for therapies that address multiple dimensions of the burden of total parental nutrition based on real-world experience of patients suffering from short bowel syndrome with intestinal failure. The survey identified the reduction in days of total frontal nutrition as the top priority for patients. At DDW, we also presented additional data from the long-term extension study of afroglutide, showing a long-term safety profile consistent with previous studies. Dr. Mike Schetzlein, our chief medical officer, will share more details of these data later in the call. Finally, in the first quarter, we delivered strong profits, with $40.8 million in GAAP net income and $76.7 million in adjusted EBITDA. Looking ahead for the year, we believe the cash flows from Lindus will continue to fund development and commercialization of apiglutide, while simultaneously reducing our debt. With that, I'll hand the call over to our Chief Commercial Officer, Tammy Gaskin, to for a Linzess commercial update and an overview of the opportunity in short bowel syndrome with Afraglutide. Tammy?

Thanks, Tom, and good morning, everyone. As Tom highlighted, the first quarter U.S. net sales of $272.5 million for Linzess represent a 97% increase compared to the first quarter of 2020-25, driven by significantly improved net price and 5% year-over-year demand growth for LinzX. Now I'd like to share some additional context from these results. To start, improved year-over-year net price in the first quarter of 2026 was driven primarily by two factors. First, net price benefited from elimination of inflationary rebates across channels, including Medicaid. We expect that this benefit from reduced inflationary rebates to persist throughout 2026 as captured in our full-year LINDS-SUS net sales guidance. The second factor that contributed to improved net price in the first quarter was favorable time phasing of gross-to-net rebate reserves as compared to the first quarter of 2025. Looking ahead in 2026, we expect reduced variability in sequential quarterly LINDS-SUS net sales and occurred in 2025 as a result of more consistent net price across channels in 2026. Additionally, we recognize $104.2 million in U.S. brand collaboration revenue in the first quarter of 2026. It represents a 169% increase compared to $38.8 million in the first quarter of 2025. In just a minute, Greg will speak to additional first quarter 2026 financial results. Now moving on from Linzest's performance, I would like to spend a few minutes on the anticipated commercial potential of apraglutide for SBS IF. For some context, SBS is a severe organ failure condition resulting from surgical resection of a significant portion of the small testing, leading to a dependence on parental support to meet patients' nutritional needs for survival. And on average, SPS-IF patients require 10 hours a day, 6 days per week of parental support with a severe quality of life burden. Parental support meets patients' nutritional needs for survival, but as highlighted by the landmark survey, central line infections, fatigue, central line pain, and abdominal pain are all common, highly distressing challenges associated with parental support, thereby underscoring the need for therapies to address multiple dimensions of total parental nutrition. Now, data from the STARS Phase III clinical trial, which is the largest Phase III trial in SPS-IF conducted to date, demonstrated a two-fold relative PS volume reduction from baseline at 24 weeks with apriclutide once-weekly dosing as compared to placebo. Importantly, these longer-term data have demonstrated that more patients continue to wean off guests with longer exposure to abroglutide. In our Phase III long-term extension study called STARS-Xtend, approximately 1 in 5 were 20% of patients achieved enteral autonomy as of January 2025. At DDW this week, we presented new data highlighting the long-term safety profile of abroglutide It was pulled from the STARS clinical program that includes the Phase II STARS Nutrition Trial, STARS Phase III Trial, and the ongoing Open Label Extension STARS Extend Trial. These data for apriblutide showed a long-term tolerability and safety profile consistent with previous studies, low discontinuation rates due to treatment, emergent adverse events, and no new safety observations. Based on the clinical data generated to date, we believe that apiglutide has the potential to reduce volume in days on parental support for patients with SPSIF. Now, turning from data, let's look at the market size. We estimate that there are roughly 18,000 SPSIF patients across the U.S., Europe, and Within that patient population, we estimate that there are more than 8,000 patients in the U.S. with SPS-IF who are dependent on parental support for three or more days a week. This group of patients dependent on parental support three or more days per week represents a total addressable SPS-IF market of more than $4 billion in the U.S. Based on apraglutide's clinical profile and our market research, we believe that apraglutide has the potential to increase the number of GLP-2 treated patients, extend days on therapy, and achieve greater than 700 million peak net sales in the U.S. With that, I'll turn the call over to Mike Schetzlein, our Chief Medical Officer, to discuss Apiglutide's ongoing clinical development.

Thanks, Tammy. Good morning, everyone. As you've heard today, we're very excited about the opportunity to help more patients with SBSIF and have generated strong clinical data, some of which Tammy highlighted through our STARS and STARS-XTEND trials. Over the past few months, we've made significant progress as we move towards site initiation of our confirmatory Phase III trial, STARS II, this quarter. STARS II is designed based on our interactions with the FDA to confirm and further support the positive data generated in the STARS Phase III clinical trial. We plan to enroll 124 patients with SPSIF in a one-to-one randomization. enrollment will be for the overall SPSIF patient population, which includes patients with both stoma and colon incontinuity. Our primary endpoint for the study will be the same as our prior STARS Phase III clinical trial, evaluating relative parenteral support volume change from baseline for the overall population at week 24. Secondary endpoints also to be measured at week 24 for the overall population include clinical response, defined as a 20% reduction in parenteral support volume, number of days off parenteral support per week, and enteral autonomy. In designing the Phase II trial, we've incorporated feedback from our prior FDA interactions and leveraged learnings from the Positive STARS Phase III trial. In preparing for the STARS II trial, we've taken steps to refine and optimize the dose administration instructions. A key consideration in designing STARS-2 was the dose selection, which we intended to confirm the efficacy and tolerability demonstrated in STARS, with patients receiving 3.5 milligrams once weekly of apraglutide. We're getting close to initiated clinical trial sites in anticipation of dosing our first patient and look forward to providing additional updates as we continue to progress. Before turning the call over to Greg, I'd like to take a few minutes to highlight our presence at DDW this week. As you've heard, we had the opportunity to present pooled long-term safety data on acroglutide, as well as new findings from the landmark survey, in which surveyed providers emphasized the importance of reducing patients dependent on total parenteral nutrition, or TPN, to improve quality of life, reduce line infections, and lower the risk of thrombosis. About 46% of the providers identified reducing the number of days per week on TPN as a priority attribute for further for future therapies. And an additional 30% prioritized reducing TPN hours per day. Survey results also highlighted the significant burden associated with long-term TPN dependence among patients with SPS. Our development strategy is informed by what we're hearing from patients in the medical community. The design of our STARS and STARS II clinical trials of apoblutide evaluate multiple dimensions of parenteral support dependence. These real-world insights from providers and patients will help us better target the outcomes that most impact SPS patient lives. Our strong presence at DDW this past week further highlights our commitment to developing life-changing therapies for people living with gastrointestinal and rare diseases through enhanced research and a deeper understanding of the challenges these patients face. With that, I'll turn it over to Greg to review our financial performance in the first quarter.

Thanks, Mike, and good morning, everyone. I'm happy to walk through the highlights of our very strong first quarter financial performance, beginning on slide 12. In the first quarter, total revenue was $106.5 million. dollars. Gap net income was 40.8 million dollars and adjusted EBITDA was 76.7 billion dollars. We ended the first quarter of 2026 with 220.5 million dollars of cash and cash equivalents on the balance sheet as well as 105.8 million dollars in accounts receivable which we expect to collect prior to the June 15th convertible note maturity. As noted in prior updates we plan to use cash on hand and cash flows generated throughout 2026 to reduce our total debt balance and plan to repay the 2026 convertible note in cash at maturity in June. We also expect to end the year with approximately $300 million of total debt on the balance sheet, less than one times our expected 2026 adjusted EBITDA. Moving to financial guidance on slide 13, we are reiterating our 2026 guidance at this time. This includes Linsess U.S. net sales of between $1.125 and $1.175 billion. We continue to expect low single-digit percentage Linsess prescription demand growth. We expect Ironwood revenues of between $450 and $475 million. And we expect adjusted EBITDA of greater than $300 million. In summary, 2026 is off to a great start. with Strongwind's best performance, a significantly improved financial position relative to 2025, and the impending initiation of the STARS 2 confirmatory trial. We continue to make progress on executing on our strategic priorities as we strive to redefine the standard of care for patients living with GI and rare diseases. I'd like to close by thanking all of our employees, patients, caregivers, and advocates for their shared dedication to advancing life-changing therapies. Operator, you may not open up a line for questions.

At this time, I would like to remind everyone, in order to ask a question, press star, then the number one on your telephone keypad. We'll pause for just a moment to compile the train or answer. Your first question comes from the line of Mohit Bansal with Walsh Fargo. Please go ahead.

Great. Thank you very much for taking my question, and congrats on all this progress. So one question I have is on Linzess. So Linzess has been very strong in first quarter of 26, And wondering, like, so the volume growth and improved pricing, it does seem like a very strong quarter. So we'd love to understand, like, what is your thought process on the guidance given this quarter, or is there any one-time item that we need to think about here?

Yeah, thanks, Mohit. I think overall we're very encouraged by the first quarter results. Prescription demand, as you noted, 5% in the first quarter, is slightly above our full year commentary on low single digits. That is a dynamic that we did anticipate. So first quarter is in line with our expectations that are factored into our overall full year guidance. And from an overall brand performance and improved net price, I would say, again, first quarter was very much in line with our expectations. I think positions us very well for our full year guidance. And one dynamic that we called out in the prepared remark is we don't expect the same fluctuation or volatility in quarterly net sales for the rest of this year as we saw in 2025. So I would expect more consistency in the quarterly easing of Lins S net sales for 2026, which puts us on a nice trajectory for the full year.

Very helpful. And if I may ask one on apraglutide as well, so, I mean, in our chat at DDW, it does seem like there are a lot of patients who are in penetral nutrition, and the expert mentioned that about 70% of them probably could be SPS patients, SPS patients. So, in that context, first is like how underpenetrated the market is currently when you talk about GATEX. And with the ICD-10 code and all, how do you expect this to improve in terms of penetration of these GLP-2s in this market? Tammy, do you want to comment on that?

Thanks for the question, Mohit. But just to sort of start at the top, as I mentioned in my remarks, we look at the total SBS population across U.S., Europe, and Japan. It's about 18,000 patients. And then we've distilled that further based on research and the patient claims data, because he's talked about, to identify about 8,000-plus patients who we see as most likely to be prescribed a GLP-2 therapy as based on the definition of requiring parental support three or more days a week. Now, within that, and the numbers that I referenced from a total addressable market of $4 billion, that's looking essentially at that 8,000 patients times the price that we know for the currently available therapy of GAD tax. Within that opportunity, today, we estimate, based on public disclosures and available claims data, that about 1,500 to 2,000 of those patients are on GATEX at any given time. So, there's still significant opportunity to increase GLP-2 utilization overall, and And we believe in the potential of a brand such as Apiglutide to also help improve adherence or days on therapy to really optimize treatment for those patients.

Thank you.

Your next question comes from the line of Amy with Jeffrey. Please go ahead. Hi, this is Kathy on for Amy. I just wanted to ask a quick question about your plan for life cycle management for Linfus after LOE. So, you've previously alluded to being able to pursue OTC for Linzess. When can we get an update on that, and have you had any conversations with the FDA on any additional data that you would need to share?

Thanks, Catherine. Mike, do you want to take over?

That's a good question. I mean, we've always been impressed with the performance of Linzess and the availability of the patients, and we have a tremendously large safety database for Linzess use. So, we do think that the product has an opportunity for OTC. We are ongoing engagement with AbbVie, our partner, with a plan for OTC. We'll continue to do that. And we look forward to updating you as we get more in the future.

Your next question comes from the line of Jason Butler with Citizens JMD. Please go ahead.

Hi. Thanks for taking the questions. Just a couple on the STARS II trial. One, just a clarification point, are you stratifying CIC and STOMA patients in STARS-2? What's your expectation for the proportion of those patients, those two different populations that are enrolled in the trial? And then just in terms of learnings from the first Phase III trial, how specifically, thinking about operationally, what are you doing to make sure that your enrollment timelines remain on track? And what's the overlapping sites versus what you used in the prior trial?

Thanks, Jason. Yeah, thanks, Jason. So, stratification is a good question. For the STARS II program, we're not formally stratifying. This was actually an outcome from our discussions with the agency. It's clearly recognized by the agency and prescribers that CIC, colon incontinuity, and STOMA patients have a significant medical need and benefit from GLP-2 therapy. So in our study, our endpoints now, both primary and secondary, are aligned with the overall population, which includes colon incontinuity and STOMA patients. However, we do need to show a benefit over the populations, so we'll actually track the recruitment of STOMA and CIC patients. But again, to the point, there's no forced stratification, but we'll align to get a representative group for both the CIC and stoma patients, as we've discussed with the agency. In regards to the operational execution, I think this SPS is a complex disorder, and we certainly did an excellent job in the original STARS program operationally. As you know, that was a very robust, largest SPSIF study ever performed. We had a very well-executed trial, as demonstrated by the low placebo response, And the 2X, as Tammy highlighted, the twice benefit in terms of parenteral sport volume reduction. So we're certainly leveraging that experience on the path forward to STARS-2, and we feel confident in our ability to execute STARS-2 as we did in the original STARS program. We'll continue to use sites we have used in the original trial. We're looking at all the sites carefully. As you know, this is a rare disease, so the number of patients per site is something we have to actively include. So we need to consider that in the calculus, but that's, as Tom mentioned, we did a lot of site feasibility already, and we're taking those learnings in as we initiate sites and prepare to those patients in the near term.

Yeah, I think the other piece there, the bottom line on this is, one, working with the sites where we know there's existing patients, and we certainly have a tracker in there, but this is also opening up additional sites, because this is all about recruiting patients as fast as we can, and we're certainly going to make the most of the sites we have relationships with, but we've identified a number of additional sites that we believe we could also harvest patients from. So I think we're excited to get rolling on this, and that will be initiated in the upcoming weeks.

Thank you.

Your next question comes from the line of Chase Mickerbocker with Craig Callum. Please go ahead.

Good morning. Thanks for taking the question. Maybe just on guidance again, sorry. You know, Tom or Greg, maybe just walk me through, you know, what went better than expected from a demand generation perspective in Q1. And then what are you keeping in mind or don't expect to recur to drive the decline in volume growth, you know, through the year that your guidance implies? Thanks.

Yeah.

Thanks, Chase. This is Craig. So I think as we gave our initial guidance for 2026, we had commented to the low single-digit prescription demand growth, and that is still our expectation for this full year. And part of the reason we had anticipated that we may see a slowing in growth relative to 2025 or prior years is as we enacted this pricing change, we expected that there would be some response and impact to prescription demand, but we were really focused on how we could maximize net sales overall over the remaining lifecycle of brand. So we didn't expect that all of that would happen in the first quarter. We thought this would happen progressively throughout the year. And I would say Medicaid in particular is one of those areas that we would expect to potentially have reduced growth in the second half of 2026 or later portions. And so that's really what's factored into the guidance and where the 5% was more in line with expectations to start the year.

Got it. Helpful. Maybe just on kind of growth to nets through the year. Obviously, there's been quite a bit of change as far as calculation there over the last 24 months. Can you just help us with how we should think about it sequentially, kind of balancing all the different drivers, including some of the dynamics later in the year with the redesign?

Yes, absolutely. So, I would say the biggest takeaway is full year, we feel very good about our overall forecast, the guidance we provided, which implies a more than 30% increase in net sales relative to 2025. I think, to your point, there were quite a few fluctuations in net price throughout the quarters in 2025. In 26, we don't expect that same dynamic to occur because we now have more consistent or less variability in net price across channels. So we do expect more consistent net sales in each quarter in 26 than occurred in 2025. From a growth rate perspective, the quarterly year-over-year comparisons could have some anomalies, I'd say, such as the 97% year-over-year in Q1. But from a dollar value, we expect more consistency in 2026.

Got it. And then just last for me on the expense side, $300 million EBITDA is seeming like a pretty safe floor at this point. But is there any incremental expense kind of outside of STARS II that we should be considering that could kind of materially drive spend sequentially from here?

Yeah, so I think you hit on the key point is as we initiate activities associated with STARS-2, we do expect our R&D expenses will ramp up throughout the remainder of 2026. But to your point, we continue to believe we'll be able to deliver greater than $300 billion of adjusted EBITDA for the year. Great.

Thank you. Your next question comes from the line of Tom Rosenfeld with InGen Health Research.

Thank you for taking the questions. My first one is, can you talk us through the magnitude of the opportunity to invest in functional constipation in two to five-year-olds, and whether you anticipate any material revenues from this labor expansion in H2?

Yeah, thanks, Dominic. I'm going to ask Tammy to speak to the opportunity we see with two to five-year-olds pending on approval.

Yeah, thanks, Tom. First, we're very excited about the potential opportunity to expand and potentially offer a prescription therapy for an additional pediatric patient population. We do expect that, if approved, the two to five will support additional demand for Linzess That's overall, but we still see the adult IBSC CIC population as the main driver of growth over the next few years. So, yes, all these additional pediatric indications add to supporting demand, but the real continued inflection will come from the adult population.

Thank you. That's really helpful. And one more question, if I may. So, as the reimbursement for the Ironwood commercial expenses was down 90% this quarter, less than the prior year, is that around the right run rate we should assume going forward?

Yes. So, if you recall, in first quarter of 2025, we completed a restructuring of our organization, which reduced the Ironwood portion of the selling efforts for Linzest. So, I would say first quarter 2026 is more representative of a run rate for the remainder of this year in terms of those reimbursements.

Thank you very much. Thanks Dominic.

We have no further questions at this time. Ladies and gentlemen, that concludes today's call. Thank you all for joining. You may now disconnect.