Sorry about that. Thanks, everybody, for coming. My pleasure to introduce Alan Edrick, the CFO of OSI Systems. Alan is going to give a brief presentation about the company, and then we will turn it over to the audience for some Q&A. Thanks.
Well, thank you very much. And thank you for coming out in these tough weather conditions. Although, being from California, I kind of like seeing all the snow, so it's been kind of fun. I think we have a very exciting story to share with you today. OSI Systems has probably never been better positioned in the history of our company. We're kind of halfway through our fiscal year. We're excited to finish up our fiscal year, and we're really even more excited for the future. So let me just kind of jump into the presentation. So from a big-picture perspective, when you think about OSI Systems, really most people follow us for our security business. Our security business represents approximately two-thirds of our revenue, but then we have a very strong optoelectronics business and a strong healthcare business. What ties everything together is our opto business.
In security, we tend to sell to the end customer, and we do the same in healthcare. In opto, we make electronic components, sensors, detectors for many Fortune 500 companies. In addition to that, we also supply many of the key components that go into our security products and into our healthcare products. Through that vertical integration, we enhance the overall company-wide gross margin, we control the supply chain better, and we can be faster and more responsive to our customer needs. We're truly a global company. More than half of our sales tend to be outside the United States, and we see that percentage increasing here over the more recent future or recent past. From a kind of taking a look at sort of an investment opportunity, we stand here today in a great position. We play in very, very attractive markets.
Unfortunately, the world's not getting a lot safer, as we see every day in the news, but that plays well into what we do. We secure borders, we secure ports, we secure aviation, we secure events. We have become the number one security detection provider in the world, surpassing our competitors. A very exciting milestone for us. We invest a significant amount in our R&D, and a big portion of what we're doing is focused on the software. And right now, we're seeing a bigger portion of our revenues being recurring in nature, and we think that recurring in nature element will only be increasing over time through our service, our software, new models of SaaS, our turnkey offerings, which we'll talk a little bit more about, and some of the training initiatives that we're doing. We have a marquee customer base.
On the security business, there's hardly a tender that's put out there that we're not invited to participate in. We have a blue-chip customer base. We have a strong management team. We recently had a CEO change where we have a new CEO effective January 1st, who was the leader of our security business, who took our security business to the overall number one market leadership position. So exciting times ahead for us. When we take a look at our business, we've really seen some accelerated growth. Being a June fiscal year end, we have about five months to go in our year. We're projecting some nice revenue growth. We tend to leverage that revenue growth to even faster EPS growth. We have a strong backlog, $1.7 billion at the end of our last fiscal year, but as we finished up our December quarter, it's over $1.8 billion.
So despite very strong revenue growth, our backlog has grown quite significantly as we've had a very strong booking, so good book-to-bill ratio, an excellent balance sheet. And one of the very exciting things is we've used a lot of cash and working capital over the last couple of years as our revenues have grown so significantly. As we look out at calendar 2025, we think there's outstanding opportunities for very, very strong free cash flow generation. And kind of on a longer-term basis, we look to convert our free cash flow in excess of 100% of our net income. So a real nice position to be in. Couple of financial slides, and then I'll jump into the overall businesses. Revenues, we've historically grown quite nicely. We took a little bit of a pause during the COVID period when, of course, there was less travel and less need for security.
The chart on the right, though, is, to me, very, very exciting, just a consistent growth in our earnings. So whether we're growing our top line significantly or we're even a little bit flatter as we were during that COVID period, you see just nice earnings growth throughout all of these periods. A lot of productivity improvements, efficiencies. We manage our costs. We've shown a lot of operating margin expansion, and in this particular fiscal year, we've given guidance of roughly 12% to 16% growth in our EPS. We're looking forward to fiscal 2026 and beyond. We tend to give our next fiscal year guidance following this fiscal year in August. I mentioned a little bit about recurring revenues. In our security business, our recurring revenues today are over 30% of our sales. We have goals to increase that at a notable mark here in the future.
We think that's going to happen as we see our service revenues, which are higher margin revenues, increasing at a faster rate going forward than our product sales. That's a real nice position to be in for us. Our healthcare business has recurring revenues of approximately 40%. Our optoelectronics, while it might not meet the classic definition of recurring revenue, is very repeatable revenue. Once we get engineered into a product, we sometimes have that customer for well over a decade, and we estimate around 80% of our revenues are this repeat nature. We talked about backlog. The slide here shows the $1.7 billion backlog, which was up to over $1.8 billion at the end of December, giving us excellent visibility into the future.
When we talk about cash flow, I mentioned we've historically been a strong cash flow generator, and then more recently, we used some cash flow and working capital. That's now beginning to reverse course. In the most recent quarter, in December, we generated strong free cash flow. And as we look forward through the balance of the fiscal year, and I'll call it even the whole calendar year of 2025, and into the future, we expect to generate very significant free cash flow. What do we do with that strong free cash flow? We bought back stock. We've done some successful M&A, and then we do some CapEx. The most recent M&A deal we did, which was in September, is performing extremely nicely for us. And our balance sheet is strong. We have low net leverage, around 2.1, I think, at the end of December.
So a real nice position to be in. Taking a look at our markets, in the security market, as I mentioned earlier, it's an area of increased focus, increased attention. With the new administration that's in place today, we think that could be some tailwinds for us. There's increased attention placed at the border, and we do an awful lot of work at the border. We're one of the leading providers to CBP, which is Customs and Border Protection for the Department of Homeland Security here in the United States. But we provide security to borders across the world. We sell to over 100 countries, so throughout many, many parts of the world. We think all the dynamics in the security space are very favorable to what we do.
Similarly, in optoelectronics, over the last couple of years, we've seen some right-sizing of inventory levels by our customers as they probably bought a little bit of excess during some of the COVID times and some of the supply chain times for risk mitigation. We think, while that's not completely done, it's largely behind us, and we see some accelerated growth that's going to be taking place in our Optoelectronics division, and in Healthcare, there's an aging population. There's a big replacement market for what we do, which is patient monitors and cardiology, and we think the market is quite large for us. At the heart of things, we are a technology company, and we invest a significant amount of dollars into R&D, namely in our Security business and in our Healthcare business, because in optoelectronics, most of the R&D is customer-funded, and this has been real important for us.
It has allowed us to generate many of the leading products that we have out there today, both on the product side, from the hardware side, as well as on the software side, which has created a clear differentiation for us, allowing us to be the number one company in the security detection market. We're going to continue to invest in new technologies, some of the latest things. We're doing a lot in AI right now. So R&D will continue to be an enabler for us. As mentioned earlier, we're a global company. We're headquartered in California, but we do a lot of manufacturing in low-cost jurisdictions such as Indonesia, Malaysia, India, and other locations. We have R&D facilities throughout the world, and we have sales offices throughout the world as well. So let's dive a little bit deeper into our security business.
Our security business primarily goes under the brand Rapiscan, though we have another brand called S2 Global, which does a lot of turnkey business, which is kind of a security-as-a-service recurring revenue model for us. We have a very large installed base, and we have a good repeat business win rate from that installed base. But also having that big installed base gives us very significant service revenues, and our service revenues tend to come at a much higher margin. We tend to be number one or number two in all the markets that we play in in security. Overall, we're number one. We have a high market share in the cargo business, which is ports and borders and critical infrastructure. We're strong in aviation, though not number one in that area. But we really do have leadership in this area throughout the world.
We do a lot of integrated solutions. We're not selling a box. We're not just selling a product. We're selling a full integrated solution of software, hardware, service, training, and many different capabilities. We have the broadest and most diverse portfolio in the industry, so what's nice for us is, rather than some of our competitors, which have to push a particular technology on a customer, we have almost all of the technology, so we can see what's right for that customer and gear a program designed specifically for them, and we think that's one of the reasons that's really helped us gain the overall market leadership position. I mentioned a little bit about turnkey, so what is turnkey? A few years back, we challenged ourselves to say, how can we expand the revenues and how can we expand the margins?
We said, well, what if there's a customer set out there that either doesn't have the money or the capital to buy the equipment upfront? Or if they do, and what if they don't have the operational expertise to do it? We said, well, let's put it all together and do a turnkey program, our version of SaaS in a different respect, security as a service. What we do here is, rather than selling a product, we manufacture the product, we place it at the customer's location, we staff it up with our people, but we continue to own the product in most cases, and it sits in our balance sheet. Then we enter into a long-term contract. These contracts have ranged from as little as six years to as much as 15 years with these customers.
And then we charge a fee per scan or a fee per site per month, and it gives us this great recurring revenue at generally significantly higher margins. And it's been kind of a real home run for us in what we're doing. And we have a number of customers out there today. We're working on a number of new customer opportunities. It tends to be best suited for the emerging markets, places like the United States, though we think it could be exceptional for the U.S., where there's unions and other things like that, it's a little bit harder to take over the overall turnkey program, but we've been very strong in countries outside the United States. We do have a big focus on recurring revenue in security, and we think that over 30% number I referenced earlier is going to become significantly higher over time.
As we have this bigger installed base out there, and now the products are starting to roll off of warranty, there's going to be nice field service revenue. We have a big initiative on training that we think is going to generate significant revenues as substantial margins for us. We've taken a new product that we have called Search Scan that we developed in conjunction with our turnkey programs and are now beginning to roll that out as a standalone true SaaS software as a service offering. So we think there's some really big growth opportunities here for us. When we take a look at some of our different product areas, cargo and vehicle inspection is our number one area in security. And that sometimes surprises people because we all go through airports and see the Rapiscan products all the time.
But the biggest part of our security business is cargo and vehicle inspection systems, which we do at ports and border crossings, critical infrastructure, certain sporting events, and the like. We sell these products in a number of different configurations. It comes often with our Search Scan software product as well, which provides a clear differentiation. We've had some big programs recently in Mexico and in other international locations. CBP, Customs and Border Protection here in the United States, is a big customer of ours, and we think it's going to become a much bigger customer of ours kind of going forward based on what some of the budgets look like and the new administration. So this is going to continue to be a very, very strong area for us that we're extremely excited about.
Speaking about some major wins, within the cargo area, we had a $200 million plus win followed by a $500 million win, both of which we're still continuing to fulfill today. And then with that same customer that we sold the $500 million deal to, which was the army in Mexico called SEDENA, we had another $100 million win. These have been great things that have taken us to a new level and established sort of new baselines for OSI overall. Some of these programs will begin to start rolling off of some of the warranties that we've been doing, and the big service revenues are going to start kicking in in earnest in fiscal 2026 and beyond. So quite exciting for us. When we move over to aviation, checked baggage, or sometimes called hold baggage, is a big area for us.
We've been selling our products everywhere in the world except for the United States. It's a product called RTT. The U.S. put in most of these checked baggage machines about 20 years ago, not long after 9/11, so they're pretty old and there's an old fleet out there. And the U.S. says they're going to begin replacing these in a few years. It'll be about a five-year replacement cycle, so we think it's a big opportunity for us here in the United States, which is all incremental for us since we weren't here in the United States before with checked baggage. As when they rolled out these products years ago, we did not have a checked baggage solution. We've been selling this product into leading airports in France and in Italy and Norway and many, many other locations.
So we're very, very optimistic that we're going to be quite successful here in the U.S. as well. In addition to selling this into the passenger market, the air cargo market has been a nice area for us for this product, selling to places like DHL and FedEx and UPS. And we're the number one player in the air cargo market. What we've long been known for is our baggage and parcel inspection products. These are what you see at the airport when you go through the checkpoint or maybe when you go into a courthouse or an office building or a sporting event or a cruise line. Everybody focuses on aviation. We probably sell five times as many of these machines outside of aviation into some of those venues that I just described. Good business for us. It's been growing significantly.
We also supply into sporting events such as the Olympics, which we recently did in Paris, and the World Cup, which we did in Qatar, and we hope to be winning the next World Cup and Olympics coming up here in the not-too-distant future. But a good business for us. Supplementing that is a trace detection business that we have, where we sell into airports, nuclear plants, and other locations. Good product area for us. I think we just completed record sales in the last quarter in this product area. We've introduced some new products called 5X, which I think has led to some of the very strong bookings and revenues that we've recently reported. High-powered radio frequency solutions is a brand new area for us. It's an acquisition that we did in September, a Texas-based company. We're extremely excited about it.
We finished up the September quarter with around $4 million of revenues. We increased that to about $17 million of revenues in the December quarter. We expect to continue to increase that through the balance of the fiscal year. We take this company's very, very strong product portfolio, and we integrate it with what we believe to be a stronger global sales channel. The business itself had a strong sales channel, but more U.S. focused. We put it into our global sales channel, and we think there's tremendous opportunities there, also supported by our balance sheet and the like. So exciting area for us going forward. We are a top provider of certified technologies. In the United States, we sell to all the who's who. Many government agencies, such as the Department of Homeland Security and big agencies within that, like CBP and TSA.
We sell to many of the agencies within the Department of Defense, to the FBI, and the like. Similarly, internationally, wherever you look, whether it's in the EMEA or Latin America or parts of the Asia-Pacific, probably everywhere, really excluding China in earnest, we tend to be there. So we're at many of these large and growing institutions. Takes us to our optoelectronics business. So we'll just have a few slides here. And again, unlike security, where we sell to the end markets, in opto, we're an OEM supplier to the Fortune 500 predominantly in a number of different industries: aerospace and defense, medical, automotive, technology, consumer, gaming. We go under two brands called OSI Optoelectronics and OSI Electronics.
As we get engineered into many of these products, we tend to be there through the life cycle of that product, which can be from a few years to well over a decade. In addition to selling to these third-party companies, opto also is that key supplier to our sister divisions in security and healthcare. And while those sales are eliminated in consolidation, it certainly helps our overall bottom line. Starting with some of the stuff that we do in electronic manufacturing and services, you see here some of the leading companies that we sell to, many of which will probably be at this conference today from the aerospace and defense side. But we also sell to the Apples and the Googles and the Facebooks, many of the big medical companies that you're familiar with.
It is a model where we can manufacture locally here in the United States, and then when volumes make sense, we can move it to our production facilities in Indonesia, Malaysia, India, and elsewhere in the world where we can share some of that savings with our customers. It's been a very, very successful model for us. What we do is not to manufacture stuff at high volume and razor-thin margin. We prefer to make it where it's sort of lower volume, higher mix, where we bring a lot of value to the table. Consequently, when you look at our optoelectronics operating margins, they're really close to industry leading, and we believe there's still further room for operating margin expansion. We think there's big high-growth opportunities in many of these markets that we play in.
Our sales and business development teams have done an outstanding job mining additional business from existing customers, as well as going out and getting brand new customers, so an exciting time for us. As we take a look at our healthcare business, it's our smallest business. It's called Spacelabs Healthcare. It represents about 10% of our revenues. Unlike security and opto, which have performed extremely well for a great period of time, our healthcare business has had a few more challenges. The exciting part for us is that we're developing a new patient monitoring product platform that we intend to roll out the first phase here in a couple of years, and we think that can lead to some substantial growth. We've had some recent leadership changes within our healthcare business that we're very excited about that we think will help take us to the next level.
We do have a strong customer base. We're involved in many of the leading GPOs or group purchasing organizations. In our healthcare business, we think the best customer you have is the customer you have, and we have a very strong retention rate of our current customers, and then we go after some select competitive conversions. Really, what we play in here is patient monitoring, which is the largest portion of our business, but we also have a cardiology and remote monitoring business, and then we supplement that with strong recurring revenues through consumables or what we call supplies and accessories in our services business. Starting off with our patient monitoring, what we do is we sell into medium and large hospitals primarily, though we'll sell to some smaller ambulatory surgery centers or rural hospitals as well.
And we sell a complete monitoring solution where we make the monitor that would be at the bedside at the hospital, which is connected to a central station so a nurse can look at multiple rooms simultaneously. It's continuously connected to the patient as they move throughout the hospital so they can be continuously monitored. Very sticky business. We get good recurring revenue here as well, and this is where we think a lot of the growth is going to come from us in the future. We also have a cardiology business. The nice thing about our cardiology business is the highest margin business within our healthcare business, and in fact, one of the highest margin businesses within all of OSI because it's very software-focused.
We tend to be number one in places like Germany and the U.K., and we think we can expand that leadership position into other places in the world as well. So as we kind of wrap it all up, it's a great time at OSI. We're showing great revenue growth, great earnings growth. We have a tremendous backlog, a tremendous pipeline of opportunities. We think the future is bright. We've got a strong balance sheet. All the macro factors play well into our favor, we believe, throughout each of our three businesses. So we're excited for the future, and we appreciate you listening to the presentation. Thank you.
Thank you. Thanks. So if anybody from the audience has any questions, we can turn it to, yeah, go ahead.
Thank you for the presentation. You note that you care about people security and that you have a relationship with TSA. I'm trying to understand your role now or to come in terms of optical scanning. I guess it's called Cat 2. It seems like a company called IDEMIA has the TSA contract. And then there's CLEAR. If you could just kind of talk about that part of the space.
Yeah. So kind of the question really surrounding what we're doing in optical scanning and how we might compete within Idemia. So Idemia is much more involved in biometrics and the like, so it's not a competitor to us. We're not in the biometric space, but it could be a natural adjacency and a natural thing that we expand into. But today, that's not our real focus in our business.
Thank you.
Thanks. Do we have any other questions from the audience? Go ahead.
Just go through those technological shifts. So how are you?
Yeah, yeah, great question. So the question about technological shifts and how that might change the competitive landscape and expand the markets, and particularly in aviation, I think you're referring to. There are some technological shifts at the checkpoint moving into CT technology at the checkpoint. We've long used CT technology for hold baggage or checked baggage when on the checkpoint. So that's providing some real opportunities there. As far as opening up new competitors, the business has been, I'd say, more consolidating in terms of competition as opposed to necessarily expanding with more out there. And we think we're sort of at the forefront. But with these new technologies, with some of the new AI tools, with some of the sort of expanding needs, I think that total addressable market has been consistently increasing.
So we've seen the potential for us and our competition expanding quite significantly, and we would think with some of these technological changes that will continue. From a technology perspective, our industry tends to be more evolutionary than revolutionary. There haven't been any massive disruptive technologies in some time. There tends to be kind of incremental changes, particularly on the software side and the algorithm side as opposed to the hardware side. Sure, sure. So the question is on our largest segment, security, where about 30% of the revenue is recurring. Can we give any guidance on where we'd like that to go and maybe what the margin differential is? So we think there's a nice pathway to get to at least 40% recurring revenue in security over the foreseeable future, maybe beyond that, a little bit higher than that even, but we think there's a great pathway there.
When we look at the margin differential, our margins on service and some of those recurring revenues in the security business tend to be kind of in the mid-40s on average, which is probably about 10 points or so above our product margins. So as we shift to more service revenue, it carries a higher margin, which then can lead to some nice operating or EBITDA margin expansion. Sure. The question is how we see the impact of the new administration to our security business. On balance, we look at it as very favorable. We think the new Republican administration is very, very focused on the border. We're very focused on the border. What we see is probably higher budgets coming for the border for CBP, customs, and border protection. There's some differences of opinion of how to apply border security.
President Trump and the like is focused on the wall, but both the Republicans and the Democrats are very focused on NII or non-intrusive inspection security screening technology, and that's exactly what we do, and we think there's going to be some greater funding for that going forward, so we think we're extremely well placed for increased adoption and penetration under the new U.S. administration. Yeah, so the question is about R&D spending on CT technology and some of the competitive landscape on that. In terms of funding R&D and the like, there is nobody bigger than us in security detection, so yes, CT would be bigger if you're talking about the medical side with a GE and Philips, but we don't play in the CT world on the medical side, just on the security side.
We think the level of spending that we have in security and R&D, particularly on CT, is quite extensive. Our R&D in CT is focused on two areas. One is improving our RTT, which stands for real-time tomography systems, which is the check baggage systems. We're working on our latest and greatest enhancements and new product offerings coming out associated with check baggage. We're also looking at checkpoint CT technology too and spending sums associated with that too.
So we think we're extremely well positioned, and much like what we've done with RTT, where even though we were later in the game coming out with a checked baggage product compared to what was out there 20 years ago, we've received very, very rapid market adoption internationally as we've rolled that product out and hope to see the same in the U.S. when the next big procurement cycle starts. Yeah. So the question is to wrap up where we see the largest areas of growth going forward. Security, security, security. While we believe that optoelectronics and healthcare represent some nice growth opportunities as well, the security space is just growing so fast. And we are the largest player. We continue to take more market share.
So we see tremendous opportunities throughout the world on the cargo and solution sides at the borders, ports, and critical infrastructure for our SaaS-based technology, both of our SaaS-based technologies for Security- as- a -Service or what we call turnkey, as well as the Software- as- a-S ervice through our search scan platform and taking that on as an agnostic vendor to many different players. In addition, on the aviation side, our aviation business has been growing considerably. Big, big replacement cycle coming up here in the United States that we'd like to be an active participant on. We're expanding the overall field that we're playing in, sort of the sea that we're playing in within security, which continues to expand significantly. So we look at security to be the fastest grower for our company.
On an organic basis, we believe that two-thirds or so of our revenue today, that's OSI, which is security, will probably continue to increase as a percentage of overall OSI. Thank you very much.