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Operator
and meaningful levels. Finally, we will be looking for continued tolerability and safety of Mavericks IV as seen in all of our other clinical programs to date. In June, we also announced the initiation of our global pivotal phase 3 clinical trial, branded the forward study, evaluating the efficacy, safety, and tolerability of oral acquired primary autoimmune or idiopathic CN who are experiencing recurrent and or serious infections. The 52-week forward trial is a randomized, double-blinded, placebo-controlled, multi-center study aiming to enroll 150 participants. The clinical operations team is in full swing opening up sites, and we are on track to fully enroll the trial in mid-2025. We believe that the interim phase 2 CN data presented to date strongly support our decision to initiate the phase 3 trial as well as its design. Importantly, we believe that the interim results de-risk the phase 3 trial given that the ANC increases seen in CN patients to date mirror those and are successfully completed for a WIM phase 3 trial where similar levels of ANC increases led to clinical benefit by reducing the frequency, duration, and severity of infections. As we focus our efforts on the forward CN trial, we are also looking to maximize the global opportunity in WIM syndrome. We expect an MAA submission to the European Medicines Agency for Mavericks for and WIM syndrome by early 2025 while we also explore additional potential opportunities in geographies where we may be able to efficiently leverage our U.S. FDA approval. With that, I'll now turn it over to our CFO, Adam Mostafa, to review the second quarter financials. Adam?
Adam Mostafa
Thanks, Paula, and thanks to all of you for being on the call with us today. As we had previously discussed, upon FDA approval of Zol-MD, we were awarded a priority review voucher, or PRV, based on Mavericks for its rare pediatric disease designation. We monetized this PRV very shortly after receipt, and in May, we recognized a gain on the sale to a third party for $105 million in cash. So, as of the end of the second quarter, X4 had $169.5 million in cash, cash equivalents, restricted cash, and short-term marketable securities. We believe these funds are sufficient to support our company operations until late 2025. I want to note that this projected runway does not include potential future Zol-MD revenue. For the three months ended June 30th, we reported revenues of $0.6 million and costs of revenue of $0.3 million, related to the sale of Zol-MD. This cost of revenue includes approximately $0.2 million of license costs, including sales-based royalties and operational milestones, capitalized as an intangible asset and amortized over the life of the underlying intellectual property. We would like to note that there was a small amount of inventory stocking at our specialty pharmacy during the quarter, and this is reflected in the sales number. Research and development expenses were $20.9 million for the second quarter, compared to $15.6 million for the comparable period in 2023. R&D expenses for the second quarter of 2024 included $1.2 million of non-cash expense. Selling general and administrative expenses was $13.3 million for the second quarter of 2024. This compares to $10.2 million for the comparable period in 2023. SG&A expenses for the second quarter also included $1.2 million of non-cash expense. Finally, we reported net income of $90.8 million for the second quarter of 2024, compared to a net loss of $55.7 million for the comparable period in 2023. Note that net income in the current period included the sale of the PRV for $105 million, as well as a non-cash gain of $20.2 million related to the fair value remeasurement of the company's Class C warranty liability. I'll now turn it back to Paula for some concluding remarks.
Operator
As you can see, all of these accomplishments mark a significant step forward for X4, now a fully integrated biopharmaceutical company. As we continue to explore additional uses for and maximize the global potential of Mavericks 4 for patients, we look forward to reporting on our sales, regulatory, and clinical progress over the coming 6 to 12 months. We'll now up and up the call for your questions. Operator?
Steve
Thank you, Dr. Reagan. Ladies and gentlemen, at this time, if you would like to ask a question, please press star 1 on your telephone keypad. You may remove yourself from the queue at any time by pressing star 2. Once again, star 1 for questions. We'll go first this morning to Kristen Kluska of Cantor.
Kristen Kluska
Hey, good morning, everybody, and congratulations on reaching 10 years. It's a great milestone, and how better to celebrate with a drug approval this year. So first, I wanted to ask how you believe physicians are going to measure success differently in a commercial setting versus the clinic for Zolremde? Will it be primarily on patient anecdotes, reports around infections, or anything else to consider?
Operator
Thanks, Kristen. I'll turn it over to Mark to give some perspectives on what they're hearing from the field.
Mark
Yeah, the launch is well underway, Kristen, and what's exciting is that we're hearing that physicians and patients have been waiting for a treatment that targets the underlying cause of the disease. And so now we have the approval of Zolremde. It's really opening up these conversations and allowing us to help physicians become aware of the disease, recognize the patients in their practice, and then think about how they can help these patients with Zolremde. We know from the market research that it's really the impact on infections that drives the value of Zolremde for physicians, for patients, and payers. So that's really what I think physicians will be looking for as they get more experience with the product.
Kristen Kluska
Thank you for that. And can you give us a sense of how partnership discussions XUS are going at this stage? Just curious, your press release noted some ways you're looking to maximize the value of Mavericks for beyond Wynn syndrome and CN. So curious in these conversations, this has come up with potential partners about ways that they can also potentially utilize this drug and other indications as well.
Operator
Yeah, so thanks, Kristen. I mean, when we currently think about the FDA approval, there are certain regions of the world that can leverage that existing approval. So there's some exploration there currently ongoing. Adam can comment more on the more strategic sides of potential collaborations.
Adam Mostafa
Yeah, thanks, Kristen. So certainly there is interest and we have discussions, as Paul mentioned, ongoing with potential partners. We'll certainly come back and update the market as appropriate if we're going to consummate a transaction. But I think given the recent approval and our recent positive crime and subpoena phase two data, there's only growing interest in this area.
Paul
Great, thank you.
Steve
Thank you. We go next now to Ted Tintoff at Piper Sandler.
Ted Tintoff
Great. Thank you very much for taking my question. And yeah, it's excited to see some revenues at the company that, I know a lot of work has gone to get that first couple hundred thousand dollars and I know it'll grow from here. My question had to do with sort of characterizing the patients that are on drugs. Can you give us a sense for how many patients are on drugs and anything about sort of the backlog? And if you're not able to give us direct patient numbers, maybe tell us sort of a little bit about the journey of patients that you're seeing as you sort of get them into commercial use of Zolondi. Thank you.
Operator
Thanks so much, Ted. So I think, you know, we won't be breaking down any details and continue to report on revenue, but I mean, we're overall extremely pleased with just the cascade of commitment that the company has made. And then now we're experiencing the receipt of that commitment in the communities as we head out. But Mark can add some more color on kind of how they're seeing the journey from the diagnosis and education support all the way through patients on drugs.
Mark
Yeah. And I think, you know, the first thing to remember, this is an ultra rare disease. And so the key here is to begin to really raise awareness both through the conversations we're having with physicians, our engagement with, you know, patient advocacy groups, and also through our digital marketing campaigns, because that's where we can get extended reach. And we've refreshed our disease awareness campaign. We've also launched our branded Zolondi digital campaigns. So we're really creating this kind of momentum around the conversations and the patients, you know, as Paula mentioned on the call, all of the patients that were in the open label extension have been prescribed Zolondi here in the U.S. And so from there, we're just learning more and more about how the patients have been waiting for a treatment that targets their disease and they're now having those conversations with physicians.
Ted Tintoff
Great. That's really helpful. I appreciate that this will color.
Steve
Thank you. We go next now to RK at HC Wainwright.
spk09
Thank you. Good morning, Paula and Adam. Congratulations on the 10 years and also the launch. In terms of, I know it's early stages of the launch, but when you go and attend these conferences, such as the Immunodeficiency Conference, how are, you know, what is it that you're hearing, you know, from physicians and patients at this point in terms of getting ready to take, to adopt the drug? And also, have you learned anything else that needs to be looked at in terms of improving, I'm not saying improving, you know, getting that option to a better level from the get goal?
Operator
Thanks so much, RK. I think, you know, we're very pleased with kind of the cascade of thinking and development of the drug. And certainly what we're hearing, and Mark will add to this, is number one, they're excited about a targeted therapy, and I'll even add the oral targeted therapy. It's been a field of injectable treatments with varying degrees of study and rigor. Our phase three was phenomenally successful, showing, you know, infection burden reduction across rate, severity, and duration. So that is a great story to begin with and a great data set to share. And then in terms of the clinicians, of course, they're all on their own journey, even understanding the disease and then learning about the benefits of Zolremdib, but I'll turn it over to Mark to add some color to that as well.
Mark
Yeah, exactly. I think it's really now that we have an approved product, it's really energized physicians to go back and really look in their practice for these patients who before now have really had no treatment available for their disease. And so now we've actually given them a reason to go back, look for these patients, make the diagnosis, and then have a conversation with the patient about Zolremdib.
spk09
Fantastic. And then for the SCN indication, so between now and if there is an interim analysis for the forward study, is there any other data that will be presented so that we can understand how this program is moving forward?
Operator
Sure. So as we shared today, we'll be giving the full Phase II data set in November of this year. So of course, we were extremely pleased with the data set already, but it was interim. But we've already seen durable responses of the drug as monotherapy and then sustained and durable responses in addition to stable GCSF. So the final puzzle piece is just exploring in what circumstances G can get reduced. So that full data set will come in November, which is going to be certainly well-timed just before ASH. We'll be at the ASH meeting to help support the CN community and also get the word further out on our trial enrollment. So it's an excellent timing perspective, and then we'll look forward as appropriate to giving updates on how the whole study is going. But certainly that will be a 2025 update.
spk09
Perfect. Thank you very much for taking my questions, Paul.
Operator
Thanks,
Paul
RK.
Steve
We'll take our next question now from Leah Cann of Brookline Capital Markets.
spk06
Good morning. I have a financial question. So Adam, could you help us with the number of fully diluted shares at the end of the quarter, including the pre-funded warrants?
Adam Mostafa
Sure. Thanks. So there's about 167 million basic shares, regular shares outstanding, 33 million pre-funded warrants, so 200 million share equivalents, if you will. And then there are 75 million warrants that are cash-only. Those are divided into two tranches, 130 million tranche, 145 million tranche. So overall, 275 million in fully diluted shares. There's some historical warrants you'll see later today in our 10Q that are significantly out of the money that are typically not included, but that accounts for a small piece.
spk06
Thank you
Paul
so much. Most helpful.
Steve
You would go next now to Stephen Wiley at Stiefel.
Stephen Wiley
Yeah, good morning. Thank you for taking the questions. Could you maybe just talk a little bit about, and again, I understand that it's early, but the kinetics of the reimbursement process? I know the paperwork that is required sometimes for these higher price rare disease drugs can be a somewhat lengthy process. And just curious if you have an early read just based on the limited experience as far as to what that process might look like from just a timing perspective?
Operator
Sure, Steve. I mean, I'll turn it over to Mark. I think classic ultra rare disease typically has barriers that a lot of these insurance companies naturally provide given the magnitude of the drug and its options for patients. But the good news is I think we've had an very experienced team well ahead of this, so I'll turn it over to Mark to give some insights there.
Mark
Yeah, thanks Paula. Hi, Steve. Yeah, as Paula mentioned during the call, payers are using their standard methods for new drugs, and so they're looking at PAs and exceptions process, but these are working quite smoothly and patients have been able to access LRMD. Of course, we also have our full suite of patient service programs through our X4 Connect, which is our patient hub, and this ensures that patients are quickly get quick access to the product while we work through the reimbursement. But
Stephen Wiley
it's good to see the process working smoothly. Okay, that's helpful. And maybe a guidance question, not one related to actual sales, but just curious how you're thinking about communicating enrollment progress in the Phase III forward trial going forward. Should we expect updates in conjunction with certain milestones hit like 50 percent, or is this just going to be kind of a moving target and we'll hear about it when we hear about it?
Operator
Yeah, thanks Steve. I think we'll always aim to communicate meaningful progress. Of course, we don't want to make any commitments just because it's a 2025 target and it's almost a year away at this point. However, certainly as we get to confidence under our belt here, we'll be able to provide some more specifics, but again, I would say that's a 2025 zone to share.
Stephen Wiley
Okay, and then maybe just another financial question for Adam. SG&A just looks to be down about 25 percent sequentially, which I guess I wouldn't have anticipated in the context of undertaking a launch. So can you just remind us if there's anything other unique to the one quarter number or this quarter number that impacts that SG&A line? Thank
Adam Mostafa
you. Sure, thanks Steve. Yeah, so this second quarter number is probably more representative of a typical recurring figure. The first quarter, as we mentioned last time, had a number of one-time non-recurring sort of start-up related costs to building a sales force and getting a launch underway early in the year ahead of approval. So that quarter was a little more inflated, if you will, on the SG&A line than I would expect going forward. So that's why the drop looks as it does.
Stephen Wiley
Very helpful. Thanks for taking the questions and congrats on the progress.
Kristen Kluska
Thanks Steve.
Steve
Thank you. We go next now to David Bouts at Zax's Small Cap Research.
David Bouts
Hey, good morning everybody. A question on the mechanism for how prescriptions are filled. Are they filled on a monthly basis? Is it multiple monthly? And then if you could talk a little bit about how revenue is recognized in relation to when those prescriptions are filled.
Operator
Sure. So I mean, I don't think we have intended to disclose kind of the -by-play for our patients. I mean, as we mentioned with our current revenue line, it does blend obviously both an inventory build as well as revenue recognition for individual patients that are now in commercial therapy. So I don't think at this point we're ready to provide any more details, but certainly we do understand the market's interest in helping them forecast. So as we head into later this year in 2025, we'll try to provide a bit more metrics, which really can help provide some benefit to you all as we think about how the product will grow over time.
Paul
Okay. Thanks for taking the question. Thank you.
Steve
Thank you. And ladies and gentlemen, it appears we have no further questions this morning. Dr. Reagan, I'd like to turn things back to you, ma'am, for any closing comments.
Operator
Well, thank you so much, operator. Thank you everyone for joining the call today, and we hope you have an excellent rest of your day. Take care.
Steve
Thank you, Dr. Reagan. And ladies and gentlemen, again, that does conclude today's X4 Pharmaceuticals second quarter earnings call. Again, thanks so much for joining us, everyone, and again, we wish you all a great day. Goodbye.
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