Good day and thank you for standing by. Welcome to the PDF Solutions First Quarter 2021 Conference Call. After the speakers' presentation, there will be a question-and-answer session. I would now like to hand the call over to your conference speaker for today Joseph Diaz of Lytham Partners. Please go ahead.

Thank you, Erika. And thanks to all of you for joining us on today's call. We appreciate the time and your ongoing interest in PDF Solutions. As the operator indicated, my name is Joe Diaz, I'm a Managing Partner at Lytham Partners, we are the Investor Relations consulting firm for PDF. If you do not yet have a copy of today's press release, it's available on the company's website at pdf.com. Some of the statements made during the course of this conference call will be forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding PDF's future financial results and performance, growth rates and demand for its solutions. PDF's actual results could differ materially. You should refer to the section entitled Risk Factors on the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and similar disclosures in subsequent SEC filings. The forward-looking statements and risks stated on this conference call are based on information available to PDF today. The company has no obligation to update them. With that said, I'd like to introduce John Kibarian, PDF Solutions' President and Chief Executive Officer, who will be followed by Adnan Raza, Executive Vice President and Chief Financial Officer. Upon the conclusion of management's prepared remarks, we will open the call for your questions. Let me now turn the call over to John Kibarian, President and CEO of PDF Solutions.

Thank you for joining us on today's call. If you've not already seen our earnings press release and management report for the first quarter, please go to the Investors section of our website where each has been posted. Today, I will start with a summary of our goals for the year. What we achieved in Q1 and finish with our perspective on Q2 and the remainder of the year. After my remarks, I will turn the call over to Adnan. As most of you know, our goal is to become the leading analytics company for the global semiconductor and electronic supply chain. We are focused on delivering business impact via improved process efficiency and product reliability. Among the requirements to achieve this goal is providing the right data, data quality, and analytics at the equipment edge. This is of growing importance, not only to leading-edge manufacturing but also for manufacturers of more mature technologies across the supply chain. Our acquisition of Cimetrix connectivity products and our equipment company partnerships, including Advantest, directly address these requirements. The tool intelligence that connectivity and equipment company partnerships provide, coupled with Exensio's capabilities to ingest and drive actions from the data, is the growth driver of our analytics business. Increasingly, our customers want to utilize Exensio analytics on the cloud to have immediate access to their data and connectivity with their factory equipment processing their products to optimize their production. Turning to the leading edge, our characterization solutions, including electrical test and design for inspection, provide these customers with the deep data and insights required to develop and control advanced processes. Worldwide investments in leading-edge semiconductor manufacturing continue to increase, and have become the focus of semiconductor consumers and governments, as well as foundry and fabless companies. As a result, we anticipate bookings and contributions to analytics revenue from CV and DFI systems in Q2 and the second half of the year to grow, compared with Q1 in the first half of the year. We will probably deliver these products as part of an analytic solution; we do have some legacy customers still buying our characterization capability as part of an integrated yield ramp with gain share royalties tied to yield achievement. With the expected growth in our analytics revenue, the integrated yield ramp revenue as a percentage of total revenues will continue to decrease over time. As we stated in our February call, we are in a period of higher growth for analytics revenue and associated investments as we head toward our long-term model. Our expectation for this year was for our analytics revenue to grow greater than our annual target of 20%, and we anticipated our total company revenues to approach 20% annual growth. In the first quarter of 2021, we started to see the results we anticipated in February, as our analytics revenue grew by more than 40%, compared with Q1 2020. Growth in Q1 for total revenue was 14% materially above the single-digit year-over-year growth over the past few years, and particularly strong when factoring in the decline in integrated yield ramp revenue. Looking deeper into first quarter results, our largest contracts included Exensio process control, Exensio cloud and on-premise TBL for Exensio fabless. Additional strength came from increased run time license sales of our Cimetrix connectivity software, which is installed on capital equipment. The strong and growing capital equipment volumes suggest that this robust contribution to analytics revenue should continue through the year and is reflected within our annual growth expectations. During the quarter, we also had many new design wins for our connectivity solutions. Meaning our equipment partners are designing our connectivity software into their products under development, which in turn will result in additional runtime licenses in the future. We accelerated our investments in cloud infrastructure and field deployments, as well as our capability to support our customers on the leading edge. Overall PDF has always been willing to invest in head of business when there is future opportunity. At the same time, we expect to generate cash from operations this year, as we typically do. As we look toward the second quarter, we anticipate continued total revenue growth on a quarter-over-quarter basis similar to what we achieved in Q1. We believe this will come not just from strength in Exensio analytics and Cimetrix connectivity that we experienced in the first quarter, but also from our characterization systems and IYR solutions on the leading edge as we benefit from the investments we made in the first quarter. In summary, I am really excited about the momentum achieved this quarter. With Cimetrix as part of the team, I am seeing more ways the combination of analytics and connectivity differentiates us further in the marketplace. Moreover, customer adoption of Exensio in the cloud is opening up new opportunities as they experience the benefits of an integrated end-to-end platform. Our recent increasing and deeper relationships with customers and technical evaluations for DFI and CV systems are strengthening my conviction for the potential of our leading-edge business. Now I will turn the call over to Adnan, who will review the financials and provide his perspective on our business.

Thank you, John. Good afternoon, everyone. Good to speak with you again today, and I hope all of you and your families are keeping safe. We are pleased to review the financial results of the first quarter and to bring you up to date on the progress of the business. We posted our earnings release and a management report in the Investor Relations section of our website. Our Form 10-Q has also been filed with the SEC today. Please note that all of the financial results we discuss in today's call will be on a non-GAAP basis, and the reconciliation to GAAP financials is provided in the materials on our website. We are off to a good start in 2021. Growth in bookings for the quarter continued the directional trend of 2020, where we booked more than 2.5 times the level of bookings of full-year 2019. For Q1, our total bookings, leaving aside Cimetrix, were double our prior quarter bookings with the core business trend and transition to analytics continuing to deliver. We continue to win large customer bookings with multiple Exensio deals greater than $1 million this quarter, contributing to our recurring revenue. In Q1 alone, we have already booked approximately half the number of $1 million plus dollar Exensio contracts compared to the total number of similar size contracts booked in all of 2020. As customers appreciate Exensio analytics on the cloud, we have experienced growth in the contract sizes as well. Our largest contract in the quarter was an existing customer that increased their annual subscription license fee by more than 30%. The strong bookings in 2020 and the first quarter of 2021 lead us to believe that the pandemic and the subsequent semiconductor shortage has acted as a catalyst in getting semiconductor manufacturers around the world to manage their operations more efficiently and effectively with our analytics solutions. Total revenue for the quarter was $24.2 million, up 14% versus Q1 2020, and up 8% versus the fourth quarter of 2020. We were particularly pleased with a 26% revenue increase in the Asia-Pacific region and a 22% increase in Europe on a year-over-year basis. Analytics revenue was up 46% to $19.4 million versus Q1 of last year and up 34% sequentially from Q4 of 2020. Contributions from the acquisition of Cimetrix played a part in the growth of analytics revenue this quarter. Even putting Cimetrix aside, the core Exensio business grew double-digit percentages versus Q4 of 2020 and versus Q1 of 2020, well ahead of our 20% annual growth targets. Within Exensio, we are seeing an increase in the adoption of our cloud offerings as greater recognition of the convenience and effectiveness of our analytics platform is realized. We also welcomed new customers from Cimetrix into our list of top 20 analytics customers this quarter, which we're very pleased about. Our Exensio cloud revenue in Q1 was more than double our Exensio cloud revenue of the comparable quarter last year. Combined with the ratable revenue we derive from term-based licenses, staff cloud deals, and recurring revenue streams from Cimetrix, we are building a strong ARR-based software analytics platform. This gives us predictability, which coupled with the growth of bookings in the analytics platform allows us to feel comfortable about a large percentage of our next quarter's planned Exensio and Cimetrix revenues. Within analytics, the DFI and characterization products' combined revenue was down on a sequential and annual basis for the quarter. The confluence of geopolitical developments, automotive supply chain shortages, and increased US focus on semiconductor production means that with our analytics DFI and characterization capabilities, we're uniquely positioned to help achieve the industry's vision. Therefore, this year we expect to capture more value from our investment. For the first quarter of this year analytics comprised 80% of our total revenue. This mix of analytics and IYR may change with the continued growth of the analytics business and potential future IYR wins. We are gaining traction as we continue our transition to becoming the largest independent provider of analytics software solutions to the global semiconductor supply chain. Our IYR business contributed $4.8 million in Q1 2021 revenue, as most of you know this is a business that we have strategically deemphasized, but maintain it with a few selective customers, while enjoying the royalty-based high margin gain share revenues. As we have previously mentioned, we expect gain share to decline in the second half of the year. On a full year basis, we remain confident about analytics revenue growth to exceed our 20% annual target and total revenues to approach 20% growth. Gross margin for the quarter was 61% versus 65% in last year's first quarter and in line with 61% of the prior quarter. Our expenses compared to last year, were higher due to investments in cloud infrastructure to support our growing recurring revenue streams and from the acquisition of Cimetrix. These strategic investments will support future analytics growth. We remain committed to our 70% target gross margins with our growing Exensio subscription and Cimetrix product revenue. R&D expenses for the quarter were up $2.1 million versus Q1 of prior year and up $0.6 million, compared to Q4. The majority of this increase is a result of the Cimetrix acquisition, coupled with some smaller increases from personnel and subcontractors. SG&A expenses were up $1.3 million versus Q1 of prior year and up $1.4 million, compared to Q4, driven by the Cimetrix acquisition. Taken together our total expenses, including cost of sales, R&D, and SG&A were in line with our plan and we believe we will be able to manage costs to similar levels while delivering on the recurring and total revenue growth we are seeing. Net loss during the quarter was $1.9 million, compared to a net loss of $0.1 million for Q1 of last year and a net loss of $1.3 million for Q4. The increase in net loss was primarily attributable to investments related to our continued transformation to an analytics company and the Cimetrix acquisition. With regards to the balance sheet, cash, cash equivalents, and short-term investments totaled $132.3 million, compared to $145.3 million at December 2020. Cash flow was impacted by accelerated investments to support our business, due in part to cloud infrastructure investments, payments related to the Cimetrix acquisition, and stock buyback of $4.5 million. We expect to generate cash from operations for the full year 2021 consistent with our history over each of the last 10 years. With a strong cash position and no debt, PDF is very well positioned to deliver on our organic growth and consider strategic acquisition opportunities as they become available. In summary, we are pleased with the overall direction of our business, we continue to make measurable progress in expanding our analytics business, benefit from the growth in recurring revenue streams, and the Cimetrix acquisition. In the first quarter of 2021 analytics posted double-digit revenue growth versus both year-over-year and the prior quarter with strong bookings during the quarter, positioning us well for the year. We are pleased with the results of the first quarter and look forward to a strong 2021. With that, let's open up the call for questions. Operator, please start the Q&A.

That is noted. The floor is open for questions. Your first question comes from the line of Christian Schwab. Your line is open.

Great, thanks for taking my questions. The commentary regarding large customer bookings - can we assume then that might be taken as a reiteration of previous guidance that Advantest would get to a $10 million run rate before we exit the year?

Actually, these are bookings of new business, Christian. So this is customers beyond Advantest adopting Exensio and our overall analytics platform.

Okay. Do we still expect Advantest to get to that type of ramp in by the end of the year, I guess then?

Yes, we do, Christian, and in fact, we did say that there was - we announced in Q4 - Advantest announced in Q4 products that include PDF technology. We do believe that as we go through this year, we will get at least a little bit above that level as some of the new products that generate additional license revenue for us are starting to sell through. And we expect that to happen by the third quarter of this year.

Okay. Q3, all right, perfect. The industries, you know, it seems to be going through a lot of different change and we have a large IDM out there, who has decided that they're going to try to become a substantial foundry in the future. It reminds me of some of your other previous successes of other companies, who made that type of transition in the past? Do you think there is - I'm sure, you know who I'm talking about? Do you think there's an opportunity for you guys? Is there any way to handicap that would be helpful?

Sure. Yes, Christian. In my prepared remarks, I talked about worldwide interest on the leading edge, certainly we were - it's when it gets to 61 things got to be covered on 60 Minutes, it kind of speaks to how front and center this is in the world. And I don't think it's just one company, we do see multiple companies around the world increasing their focus on the leading edge in the US and China, and Taiwan and Korea and other places. We, in my prepared remarks, did talk about an increased amount of pre-sales activity on the leading edge in the first quarter and part of which resulted in some higher expenses. I mean, we took on those expenses, because we felt that we can't predict any one single customer or any timing of anything single thing, but when this has happened in the past where the world starts focusing on leading edge, it's historically been pretty good for our leading-edge business.

Yes, can you give us an example of - I was trying to think of previously when the IBM Alliance happened and a certain set of customers, kind of, went from zero to - I think a material number, but I can't remember. Can you remind us of that, kind of, ramp?

Yes, so, sure; I mean there were about three customers in that time period. If you go back, actually - Adnan's prepared remarks was 2009 last year, we actually lost money for the year from operations. And then once those companies started to make that investment, it's only the $200 million dollars in cash from operations over the last decade or so. So when those investments happen, they tend to be very big. But we can't say when or if that's going to happen this time. But these bets - our customers are making very, very big bets, and PDF technology is very helpful in untangling the Gordian knot that is the old problems. And so I think that speaks to why we've seen an increased activity with customers around the world, right? I don't think it's anything specific to any single customer.

We have our next question from the line of Gus Richard. Your line is open.

Yes, thanks for taking my question - questions. What percentage of your analytics business now is based in the cloud?

We haven't broken that out specifically and I don't have the number in front of me. I know that for Exensio, it is a sizable percentage of the total Exensio business, but I don't know off the top of my head, Gus. I'd like to collectively with time-based licenses we have. I'd say a bit why it's like that, Gus. We have a lot of customers where they buy the cloud service through, and so they pay for Exensio and we turn around and pay some of the money to our cloud supplier. We have other customers who already have contracts with the cloud supplier for the hardware portion of it, but they pay us for the cloud subscription of Exensio, including all the managed services. So then, our gross margin in that case is higher, but the revenue is slightly lower and we lump that in our time-based licenses, but effectively it's cloud because we manage the systems and we manage the data ingestion, etc. It's just whose payment portion to the cloud provider - the hardware provider.

What I'm trying to get at is how much of your software revenue is ratable and how much of it is upfront?

Yes, the vast majority of its ratable there. I think last quarter there were, as - I had not said a number of customers did bookings over $1 million; all of those were either time-based licenses or cloud contracts; there was no perpetual licenses in the large ones. We do still have some smaller customers, device from - of Exensio on a perpetual basis, but it's a relatively minority of that business.

So most of the revenue when you get a $1 million contract generally spread over two or three years?

Correct. Typically, I think last quarter almost everything was on a three-year term.

Perfect. And then thinking about the electrical characterization business and it's very different in the software business, although I know they're tied together. How does electrical characterization, be it I want to say pro, but you know what I mean? And DFI how does that turn into your business and how do you plan on monetizing that moving forward?

Sure. Yes, so in my prepared remarks, Gus, I did talk a little bit about when historic - small number of historical customers that we still do sell at an IYR basis, we've done that with them over many years now. But for the most part, I'll give you an example; customer has a cloud deployment for Exensio for process control and their factory. They are at this point more and more selling wafers, where they are not doing the product test; it's a partnership with the customer that's kind of treating them like a foundry even though they're historically not a foundry. And they use our scribe line test structures and systems as a way of establishing acceptance on the cloud. So it is the analytics application on the cloud, but does a series of alignments in correlation to that scribe data, which is a very rich set of information with all the upstream data and they use that on a basically like an MRB application to decide whether to ship the wafer to the customer or not. It's a combination of the scribe line vehicle and the cloud offering that they use. And they used to call from a number of others as well.

How do you charge that, what's the business model? Is it just -

It's a subscription.

Okay. So you will do the characterization vehicles for the customer. You also buy the parametric tester and they'll pay a fee for usage?

On an annual basis, correct.

Okay. And then last one for me and I'll let somebody ask some more questions. What status of DFI in terms of placing additional systems in the field and with your key customer?

Yes. So you know as I said in my prepared remarks, we have an increased level of intensity on the activity on DFI in the first quarter of this year. And we expect to place additional systems as we get into the remainder of this year. The timing may be early third - end of second quarter or early third quarter, but we do expect that to happen.

Okay, this with multiple customers or?

We've got activity going on with multiple customers at this point, Gus. Again I told in my prepared remarks, I think there is DFI activity going on with three or four customers at this point.

Is it reasonable to assume they're all leading-edge logic?

Yes, it's reasonable to assume that.

Your next question comes from the line of Andrew Weiner. Your line is open. Please go ahead.

Hi, good afternoon, John. Following up a little bit on Christian and then Gus's question, when we think about potential activity in DFI and CV for that matter, with leading-edge customers. Is it - is built into your current guidance more expectations of significant bookings with a small revenue contribution? Just how should we think about that given obviously the ASPs you have historically talked about, particularly with DFI? I would think if we start to see a significant ramp in terms of selling multiple units that would add a tailwind that you didn't see when you were exiting - when you're on last call and give, sort of, a similar guidance?

Yes, so you know Christian asked this question as well kind of a little bit differently and with kind of looking back in the past. It takes years to build that up, but we do it - but you - the chunks are relatively large. As we look out over the next few quarters, we do expect characterization; it may be a mix of a little bit of yield ramp capability and some CV and DFI capability picking up over the next few quarters. We expect it to be more modest in the next couple of quarters and build up from a revenue standpoint and build up more substantially, while the bookings can be relatively meaningful this year. Bookings will be more impactful; the successful bookings will be more meaningful than the revenue impact; the revenue impact will be relatively modest this year.

Okay. And just to be clear when you say that some of the customers you're talking to are at the leading edge or talking - contemplating an IYR model, so that would be a IYR services engagement with a royalty back end? Or will it be more of that it would just fall into the IYR category, but be some sort of ratable revenue recognition?

Yes. In my prepared remarks, I made it clear, right? It's an existing customer that's used to gain share contracts in IYR in the past and it is like the contracts we've done with them in the past, which is deploying, measuring yields and establishing a gain share period over many years.

Okay. But the other leading-edge players would likely fall within the analytics category, the way they lead DFI customers currently is?

Yes, that's our expectation.

Okay, and then secondarily it was nice to hear that, you know, had a number of seven-figure Exensio wins in the first quarter. Can you talk a little bit about what type of these, they are pilot or beta pilot activity you have ongoing and what the pipeline looks like?

Yes, yes. Sure, yes, the activity level on Exensio continues to increase and this past quarter, there were a mix of fabless companies primarily using the cloud some on-premise, customers that use Exensio process control on that we're doing relatively large renewals in all the cases in process control, and only a couple of them that were relatively big step-ups in their annual recurring run rates as this new capability on process control that they wanted to include in their license. Adnan talked about that in his prepared remarks. As we look at the second quarter and beyond, we have a number of activities with customers, a lot of continuation on the same theme, a lot of customers that have historically been with Exensio on-premise, moving to Exensio on the cloud to get that extra productivity. We're releasing some new capabilities for Exensio cloud that helped customers manage their data, particularly for quality-sensitive markets like automotive and things like that, that are - we're piloting with customers now, we anticipate seeing incremental upticks. I've been told that the way I describe this is confusing, but I call it expand the landed. When you look at PDF, we have a lot of most semiconductor companies, know PDF or buy something from PDF today. So we don't need to go and kind of knock on doors where folks don't think PDF means Acrobat. The customers that we sell to know what PDF means and they already are using some part of Exensio and we are mostly doing a lot of expansion. So a lot of it is, there are some new names, but I would say the vast majority of it is extending inside existing accounts.

Okay. And then I guess my last question is you, sort of, referenced with Cimetrix that there are, I guess what I would call sort of new design wins where they're being defined into new systems that are being developed, I believe - was how you characterized it? Just wondering how significant those are meaning, how does it expand either customer base or the served market opportunity from a market share opportunity perspective?

Sure. Yes, and thanks for picking up on that, Andrew. So yes, the quarter-to-quarter, as we've kind of coming to learn about this business, how much one-time license you get is the work the team did a year or two ago, getting the connectivity software designed into platforms. But they tracked very closely design wins places where customers evaluate our connectivity solutions versus alternatives or do it themselves rather than third-party systems. And the activity this quarter - the wins this quarter were up substantially over, the kind of average run rate last year, and we'll see how that maintains for the remainder of the year, but we feel that bodes well for run rate opportunities next year and the following year, as those products - those hardware products get - put into the field. And we don't have - it's really hard to know how many more opportunities are also in the ones that they're taking advantage of, but the success rate is quite high. I think the connectivity part is very strong and customers are very excited about connecting that with advanced analytics because there are a lot of folks like Advantest that have a tremendous amount of knowledge about their equipment that they want to make available to their customers in the form of analytics, and connectivity is the first step in analytics, right? You got to get the data off the tool to be able to do something with it.

Your next question comes from the line of Tom Diffely. Your line is open.

Yes, good afternoon. I was hoping, John, just to - if you could talk a little bit about as you transition to an analytics software company, how has your ability been to attract and retain talent from an employee point of view?

Right, you should always ask about talent. Yes, but we feel pretty good about the talent that we've been able to retain. We have locations in great places; Kevin and I were in Salt Lake City last week, and I thought to get the vaccines, I felt good enough to travel, and I got to meet the team there, and we have a great team in Salt Lake City. The Cimetrix team in 2021 is one of the greatest places in Salt Lake City to work. And so, you know, that team is a strong team that's been able to grow and we feel very good about the PDF teams in the other locations we added to the Bay Area this past year and we also added in Vancouver, where we have an engineering team, and we feel quite good about those locations as well. We've tried to pick locations where people want to live, I mean, obviously Salt Lake came with the acquisition, but it's a great place to live and it's a great location for our team. So retention on the engineering side has been quite good and the team acquisition in particular in industries where we're living is cost-effective has been very strong.

Okay. And then I guess related, how much of your workforce at this point is kind of work-from-home environment? And how much of it needs to be like a centrally located around maybe a lab or a facility that you have?

Yes, I think the - I've always joked that the engineers' perfect work environment is their couch, a rope, and a bag of Cheetos. So for the engineer, particularly engineers doing software, which is the vast majority of them, they all tell me they feel the productivity working from home has been quite high. We've been doing surveys and whatever I do employee meetings I - we use the features in Zoom often to collect data from the team. And I think was - what the new workplace is going to look like, we're not going to go back to where we were before. Adnan and I are in the office today and we do have people coming into our offices now in the US as well. Our Dallas office is back opened, Salt Lake never really closed. And our offices in Asia, folks are going in every day between Taiwan and China. So it's coming back, but I would say that people are not going to be back typically five days a week; it will be working from home some number of days and working from work some number of days. We are trying to encourage people to stay near a city where we have an office, so they can go in some amount of time, I really believe the dialogue and whiteboard stuff, whether it's for business development or product vision and strategy, is always valuable. But our teams are geographically spread out anyway, so a lot of the folks you interact with are not in the office, if you are in Santa Clara, a lot of the folks you interact with are not in the Santa Clara office anyway, they may be in the Salt Lake office or in Dallas or Vancouver wherever. So our folks are going to be working in a distributed way on a going forward basis, probably more than we did in the past, but not to a 100% this period.

Your next question comes from the line of Gary Schnierow. Your line is open.

Hi, John. I want to go back to the conversation of the DFI placement.

Yes.

I assume that those are the eProbes?

That is correct, yes.

And can you tell us how many eProbes are - have been placed already?

There are a couple in factories at least in two different factories.

Okay. And so when you were saying increased activity additional systems, I assume that more than one that you're going to play later this year?

Yes, we believe that.

Okay. That means that's not great. And, Gus had asked the question about, and it was answered that the vast majority of - is it your total analytics revenue is ratable or just Exensio revenue is ratable. Can you clarify that?

Yes, I mean frankly even within Exensio, if we were to look at our components that go into the ratable revenue that John mentioned at the time-based licenses, those are some of the perpetual licenses, some of the cloud licenses that we have, as well as the ratable portion that we get from Cimetrix because there is a portion there that's ratable. Yes, is the software that shifts in the machine to the machine shipment, we get that revenue right away, but then there's some support and maintenance contracts that are ratable. So, you know, measuring as a percentage of our - and I know we don't break this out. But within our - I was looking at Exensio CCG. But if you looked at within the analytics - it's probably about half already that's ratable. We do have to make some adjustments; this is why John was also cautious because within the way we currently classify TBL, it lumps in there a couple of things, it lumps in there is ratable as well as some of the upfront fees as well, which is why we need some more time to do that work to clean up. But it's starting to head toward being about half ratable of the percent at the analytics.

Great. And it sounds like you're saying that you're working on getting more specific number for us going forward?

Yes, this is, I mean, it's a great question everybody asked that, and we need to do this. So as we've been transitioning the business, we expect that hopefully by later this year, that we can be talking to you about that number, if not sooner.

Okay, great. And I think John, in your prepared comments you said that you would expect second quarter total revenue growth quarter-over-quarter to be similar to the first quarter?

Yes, growth of the fourth quarter, correct.

Okay and I - is it fair that third quarter over second quarter and fourth quarter over third quarter should be similar quarterly growth rates? Or is there something that you see for the second half of the year that you would expect that to slow down?

Yes, we haven't given a specific - we've given specific number from the annual basis, Gary, that we expected to approach our - the total revenue growth to approach our analytics growth target of 20%. But we haven't broken it down specifically within third and fourth quarters. We have said, we have the headwind of some gain share contracts tailing off in the second half of the year, but we feel very comfortable about the bookings growth that we are experiencing in this customer activity to grow through that headwind, we grew through a relatively significant headwind this quarter, as you know, if you look at the IYR revenue Q4 versus - Q1 versus Q4, it was down pretty substantially, yet we still grew. So we're not breaking it out right now, Q3 and Q4, but overall, we do expect the second half of the year to be stronger than the first half of the year.

Okay, great. Yes, I guess, trying to connect the dots, understanding that the IYR is weak as happened. I think analytic is growing, but analytics was up 46% year-over-year in the first quarter, and I assume that healthy growth rate should continue, but in your press release, I think you just say greater than 20% growth, which, it doesn't seem like much of a bogey?

Well, we'd like to exceed our bogeys, Gary, we feel pretty good about where we're going this year.

Yes, I mean there are a lot of shifts like John mentioned happening, right, there is the DFI business that we expect to win. There is the ramp in the very successful Cimetrix acquisition of what the team there is delivering, offset by the gain share. So there is a lot of moving pieces this year, which is why we're comfortable saying what we have.

Right. No, I appreciate that. I guess just back to the DFI, those additional machines at existing customers.

Yes, I think at this point where we're comfortable saying is, we've got activity going on with a handful of customers and exactly handicapping where we install what, I think is still not clear to me. We don't have a lot of bandwidth, right? So we will be at some point, limited by what we can bring up when, and customers will have to see how important this is to them, and who wants to make sure we have capacity for them.

Meaning you have multiple customers interested, you have more customers interested - customers interested in more devices that you have at the moment, is that what you are saying?

I think we're limited greatly by our capacity to install and bring up. We have some machine limitations as well. I think right now, will just be, still with the pandemic you - I think Tom was asking the question like, can people work from home and for everyone on the Exensio and Cimetrix side, absolutely, for the DFI side, not so much, and so that - I'd like to kind of not be too specific there, because we're going to go see what's going to come through first and how many of the things we could do.

The last question that we have is from the line of Orin Hirschman. Your line is open.

Hi, congratulations on the progress. In terms of narrower features more aligned with and more difficult yield situations. Is that making a difference in terms of the acceleration on the bookings? What is driving that acceleration? Is it just in general, the expansion of both fab capacities? It is...

Yes.

Color even - you have given a lot of color, but can you give any more?

Sure. I think in general, for the greater Exensio and Cimetrix connectivity, it's really just the increased activity in semiconductors, particularly with the Cimetrix products, they ship with every piece of equipment, and equipment volumes are up and they're up on many mature nodes too, it's not about the leading edge. With respect to design for inspection and electrical characterization, smaller feature sizes are one of the drivers. But I would say almost the most important one is the 3D nature and the 3D complexity of silicon processing these days. A lot of what you would normally inspect on the surface of the wafer isn't what really drives yield loss; right, conventional inspection today is still primarily using a light source as you look at the surface of the wafer. But at least half of the yield loss that we see on leading-edge parts, is really about the connections in between the layers, whether they are shorted or opened. And the electrical test structures, as well as some of things we're doing with DFI, really allow you to look at those between layer drivers. And that we feel is a bigger driver for our characterization solutions per se, than the feature size itself. But I would say broadly, the analytics business is just about the increased activity in semiconductors overall. It's really just the characterization at DFI that are very sensitive to the number of players investing on the leading edge.

Okay. This is a question I should know the answer to perhaps, but I don't. When you collect the billions of data points that you collect, obviously they are available to the customer themselves, are those data points anonymously able to be used by you, to continue to perfect algorithms across all customers?

Yes, that's a great question. So in our cloud contracts, we usually request the customers allow that we can use the data to improve our algorithms, and improve our systems because the customer benefits from the fact that our data systems could process data faster, our algorithms can detect outliers and defects more effectively. So it's good for the community overall if we can make our analytics better. And so we've put that in our contract and we manage a few petabytes and that we have - Exensio petabytes of data these days. We, on our call solutions, are managing a growing fraction of that. And so we use kind of our existing capabilities in sandboxes to optimize and improve things like, our ability to load data in parallel fast, to retrieve data fast, and our customers will benefit from newer analytics, newer ways of slicing and dicing data.

Okay. And finally in terms of - again, I don't know if there's any answer that you guys know that you could tell, in terms of how long it will take to perm - to grow across so many instruments and different back-end etc. How many years before they really get to the point of a critical mass, where you kind of get a picture from beginning to end of the whole cycle of the chip, right through final packaging and assembly? And maybe you could do it perhaps even today across an individual company, if they so desire, but how does that vision unroll and how long does it take to test it?

Yes, I think what you're getting - you're getting at a very important point Orin. So our industry and our customers, generally speaking, some of our fabless customers will chip - they order a wafer from a foundry, they send it to another site to be tested, to another facility to be packaged, to another facility to be tested, and then eventually get shipped to a sister manufacturer like Sanmina or Foxconn and put into a system. And never did that chip ever go through a facility to have that fabless company's name on it. So visibility of data across the supply chain is very important. We provide a capability called the DEX nodes, that give customers the ability to see their data at their OSATs, and obviously at some points as they come out of their foundries, the visibility inside the foundry process is relatively limited these days. So there is some level of that today for our customers. I think it could always be better than what is available today. Some of that's due to the limitations in the way the boundaries between companies. But for sure for test and for some of the packaging and final test capabilities, our customers use the DEX nodes to get transparency there, and we are expanding that network of available suppliers, as we go through this year. So more and more of their likely suppliers are already covered under the system.

And last part of my question is the metric, how much does that accelerate the whole process for you?

That's a great point. Quite a bit Orin. So the metrics are a 30-year company, with a long history of defining the standards for data collection. I think they share something like 10 of the standards bodies at SEMI, but also in the Taiwan Printed Circuit Board Association and many of the other industry associations, whether it's in front-end factories, in assembly, in printed circuit board manufacturer, print circuit board back end, they are the leaders in working with the community in an open-source way, and open way - to define the standards in an open fashion. Obviously, our software supports those standards, but we want the world to adopt them, so we do that in an open fashion. We have quite a long history through that acquisition of working very closely with about 200 equipment vendors, where we help them deploy those standards. That means, and that's why my last bit of prepared remarks, that we see a lot of ways we can bring closer together the analytics with those data collection standards, and new enhancements in the standards. So the latest things that have not been proposed to centers, but have not been fully accepted yet, we're implementing those in the software, so our customers can get access to that, because people always want the newest way to look at data, and more insight about their equipment. Cimetrix is really quite an important piece to the overall vision of end-to-end analytics available on the cloud across the manufacturing supply chain. It's a very important part.

There are no further questions at this time. I would like to turn the call back to Mr. John Kibarian, CEO of PDF Solutions. Please go ahead.

Thank you for participating in our Q1 call. We look forward to talking with you again soon. Have a great day.

This concludes today's conference call. Thank you all for joining. You may now disconnect.