Matthew Foehr : Thanks, Kurt. Good afternoon, everyone, and thanks for joining our second quarter conference call. I'll start today with an overview of our business here on Slide number 4 of the deck. At the core of OmniAb's business model is our proprietary discovery technology platform that's designed to help partners discover innovative therapeutics quickly and efficiently. In a simple sense, it's a model based on licensing innovative technologies to partners. OmniAb is differentiated in the marketplace by having the most diverse host systems for fully human bispecific -- fully human and bispecific antibody discovery with the industry's only 4-species platform. That includes transgenic mice, rats, chickens and cow-based technologies.
Our partners have an increasing number of antibodies in clinical trials that are from our technology and the versatility of our platform continues to be demonstrated in the number of modalities and formats being employed by our partners, both preclinically and clinically. We offer flexibility to meet our partners' evolving scientific needs as we believe generating large and diverse repertoires of high-quality antibodies increases the likelihood of success in optimizing desired therapeutic characteristics. Our technology and our core capabilities are driven by, what we call, the biological intelligence of our transgenic animals and are further strengthened by our innovative, high throughput screening and other technologies. There are 74 partners with access to our technology or to OmniAb antibodies with over 300 programs in various stages of research and development.
The antibody space is one of the fastest-growing parts of the drug industry with a market size expected to be larger than $250 billion within a couple of years. We believe we're in a great position to capitalize on this opportunity with our unique and expanding technology offerings. We're constantly innovating our technology stack, and this past May, we introduced our newly branded OmniDeep offering, which is a suite of in silico capabilities, including structural modeling, large, multi-species antibody databases, molecular dynamic simulations, artificial intelligence and machine and deep learning sequence models that are applicable across our technology platforms to further enhance our partners' discovery process. In addition, we plan to introduce our novel heavy-chain-only OmniChicken that we will be branding as OmnidAb in the fourth quarter of this year.
And I'll say more detailed [Audio Gap] and our excitement around that technology until later this year when we launch it. On this next slide, I just want to reiterate that as a company and as a team, we're mission-driven to enable the rapid discovery of innovative pharmaceutical products by pushing the frontiers of drug discovery technologies. We're poised for continued growth, as shown here on Slide number 6 by the new license agreements we signed during the second quarter. In Q2, our team closed 4 new platform license agreements, one with Merck, Inc. and one with Neurocrine Biosciences as well as platform deals with Stanford University and Seattle Children's Hospital. Regarding Merck, this is a new agreement and is with the U.S. Merck & Co., not to be confused with the German Merck KGaA with whom we also have an agreement.
We reached a total of 74 active partners at quarter end, up from a partner count of just slightly more than 60 as of a year ago. Our discovery platform continues to garner interest in the industry among a diversified group of leading global pharmaceutical companies, allowing us to leverage our highly scalable business model. Adding partners like Merck Inc., who are global leaders in the industry and who are committed to using the power of leading-edge science to improve lives, bolsters our growing list of partners. We believe this is a testament to our effective and efficient discovery technologies to our in-house expertise for scientific collaboration services, our mindset for developing a deep understanding and also prioritizing the current and the future needs of our partners as well as our commitment to continued innovation.
Here on Slide number 8, our portfolio of active programs increased to 305 with 29 programs in the clinic under regulatory review or approved for commercialization at the end of Q2. During the second quarter, we added a net total of 4 new programs to our portfolio. Importantly, I want to note that when we report program count, we do so net of attrition, as attrition is expected in the pharmaceutical industry. In this quarter, attrition was seen only in the discovery stage of our partner pipeline. The pie chart on the right-hand side of the slide breaks down our 305 programs by stage of development. The discovery phase consists of 261 programs in addition to 15 programs now in the preclinical stage. In the clinic, at the end of June, our partners had 22 programs in Phase I, 2 programs in Phase II, 1 in Phase III as well as 1 program currently under regulatory review.
There are 3 approved drugs utilizing OmniAb-derived antibodies, and we're recognizing royalty revenue from commercial sales of zimberelimab and sugemalimab in China, both of which are also being pursued in other geographies. We saw some nice progression of programs in the quarter as well, with 3 programs transitioning from the discovery stage to the preclinical stage with 2 programs moving from the preclinical stage into their first human clinical trials and with 1 Phase III program moving to a regional filing for approval, shown here on this Slide number 8 pie chart on the right as BLA stage. Our large and growing portfolio features a diversified set of partners utilizing a variety of formats and modalities, as I mentioned earlier. I'd also like to note here that the count of active programs has increased from 270 in the year-ago period, up to 305 programs at the close of the second quarter, noting again that this is net of program attrition.
Despite some of the industry's challenges, including evolving financing environment and funding constraints, especially for some of the smaller players in our industry, our portfolio continues to expand from a combination of new and existing partners. We don't feel that it's entirely unexpected that macro factors can influence the velocity of growth of some of our business metrics. And although we see a slightly lower number of net new program additions compared to last year, OmniAb is in a very solid position for continued growth with an increasing number of both active programs and active partners. Moving now on to Slide number 9. As I mentioned, in the second quarter, 2 new programs entered the clinic with Immunovant who initiated a Phase I clinical trial of IMVT-1402, which is a subcu FcRn inhibitor.
Also, Gloria Pharmaceuticals initiated a Phase I/II study to investigate the safety, tolerability and preliminary efficacy of GLS-012 as a monotherapy in combination with GLS-010 in subjects with advanced solid tumors that have progressed following standard treatment. We've now had 3 new programs entered the clinic in the first half of this year, and we expect a potential 1 to 2 more to enter the clinic before year-end. I want to note that when 2023 began, we indicated that we expected 3 to 5 new programs to enter the clinic this year. By the end of June, we'd already reached 3, and we're now focused on an upward range of 4 to 5 new clinical programs for the year. Our partners made numerous public announcements about their clinical and commercial progress during the second quarter and in recent weeks.
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