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Operator
Good morning. My name is Betsy, and I will be your conference operator today. At this time, I would like to welcome everyone to Vertiv's Second Quarter 2021 Earnings Conference Call. (Operator Instructions) Please note, this event is being recorded.
I'll now turn the program over to your host for today's conference, Lynne Maxeiner, Vice President of Investor Relations.
Lynne M. Maxeiner - VP of Global Treasury & IR
Great. Thank you, Betsy. Good morning, and welcome to Vertiv's Second Quarter 2021 Earnings Conference Call. Joining me today are Vertiv's Executive Chairman, Dave Cote; Chief Executive Officer, Rob Johnson; Chief Financial Officer, David Fallon; and Chief Strategy and Development Officer, Gary Niederpruem.
Before we begin, I point out that during the course of the call, we will make forward-looking statements regarding future events, including the future financial and operating performance of Vertiv. These forward-looking statements are subject to material risks and uncertainties that could cause actual results to differ materially from those in the forward-looking statements. We refer you to the cautionary language included in today's earnings release, and you can learn more about these risks in our registration statement, our proxy statement and other filings with the SEC. Any forward-looking statements that we make today are based on assumptions that we believe to be reasonable as of this date. We undertake no obligation to update these statements as a result of new information or future events.
During this call, we will also present both GAAP and non-GAAP financial measures. Our GAAP results and GAAP to non-GAAP reconciliations can be found in our earnings press release and in the investor slide deck found on our website at investors.vertiv.com.
With that, I'll turn the call over to Executive Chairman, Dave Cote.
David M. Cote - Executive Chairman
Good morning, everyone. I know I've said this many times, but I truly believe it, though, I guess I'm going to continue to say it. Vertiv is a great company and is in a really good industry. No company, no industry is ever perfect, of course, but from what I've seen over the last 8 years, I am very pleased with the company, the management team and the industry.
Vertiv continues to make all of the right investments in product development in the Vertiv User Experience, in the Vertiv Operating System and many more arenas, which are all areas that will pay off more in the future than they even have to date. Truly is personifying the winning now winning later mantra that you all know is so important to me.
The focus on today and tomorrow at the same time is especially true as Rob and his team focus on taking care of customers. It's an age old concept, but it sure has been proven to be true. And if you do a great job of taking care of customers, that is one of the best long-term strategies you can have.
So it is costing us something to do, as you can see from the numbers, with those [flat back eyes] that Rob and his team have had to do to. But all of us are absolutely convinced it's the right thing to do. Taking care of customers today and tomorrow every way you can is clearly a winning strategy.
So with that, I'll turn the call over to Rob.
Robert J. Johnson - CEO & Director
Thanks, Dave, and thanks for your guidance that you provide both to me and to my executive team in supporting Vertiv in all the ways that you do. We are better and a stronger company having you as our Executive Chairman. To all of you on today's call, thank you for being here. And I'm eager to share with you our performance for the 2021 second quarter, our outlook on the market and information about a few of our growth initiatives that we're driving at Vertiv.
There are 5 key messages I want to convey today. And David Fallon, our CFO, will take you into a deeper dive of the financials in just a few minutes. First of all, demand for Vertiv products and services is strong. During our last earnings call, we reported first quarter sales that were up more than 22% and orders that were up 21% compared to the first quarter of last year.
I am pleased to report that the sales and orders are up again in Q2. Sales were up 25% and orders were up over 24%. Having sales and orders growth in excess of 20% in the back-to-back quarters demonstrates our customer-first approach and that it is paying off. In addition, our Q2 backlog rose to $2.3 billion, the highest it's ever been.
Second, profitability is up. This quarter, our adjusted operating profit was $134 million, which is up $31 million or 30% from last year's second quarter. This resulted in adjusted operating margin expansion of 40 basis points. Third, Year-to-date free cash flow is greater today than it was this time last year. Free cash flow for Q2 was $41 million and year-to-date, $84 million. From a year-to-date perspective, this represents an improvement of over $225 million versus the first half of 2020.
Fourth, we are dealing with supply chain issues and inflation issues. We encountered supply chain challenges in Q2 and experienced commodity and freight inflation. As Dave mentioned, we made spot buys so that we can meet the delivery commitments to serve our customers and we've implemented strategies to recapture cost. Pricing always lags cost by a quarter or 2, and that's exactly what we're seeing now. I have a slide coming up with more details on this.
And finally, the key message, we're raising our 2021 guidance by $100 million in sales and $5 million in adjusted operating profit. This action demonstrates the confidence we have in our end markets and also reflects the priority we're placing on customer pursuit and capture. In addition, we are balancing the timing of incremental pricing coming into the P&L.
Turning to Page 4. We've been using this slide each quarter to illustrate what we are seeing in each of our world regions and each of our end markets. As we said before, Red button indicates sluggish performance. The green button indicates strong performance, and the yellow button indicates somewhere in between. For the second quarter in a row, there are no reds.
Let's take each market. Cloud and hyperscale and our colocation markets remain strong. The demand for digital applications continue to fuel the industry and is driving strong and a growing need for Vertiv products and services. In our enterprise small and medium business market, we continue to see signs of progress as it works to recover from the pandemic. We are experiencing an increase in pipeline and orders. If the current pace of activity continues in this upward trajectory, we will be able to upgrade a few of the markets that are yellow to green on our next call.
The communication network stayed constant in all regions. 5G deployments and trials are continuing as are the starts and stops of customer deployments. These will provide tailwinds for us over the next few years. In the commercial and industrial market, things remain constant. While this is the smallest slice of our business, the variety of products and services we sell here continues to strengthen. All in all, the end markets we serve have remained steady.
Moving on to Slide 5. I want to provide a little bit of color around demand as we're seeing it and give you a glimpse of 2 of growth investments. As mentioned earlier, overall market demand is strong, as indicated by our order rates and record backlog. This scenario led us to raise our guidance.
Each of our regions saw revenue growth in the second quarter, led by continued strength in the cloud and colocation markets. Our cloud and colocation customers continue to build data centers in an aggressive but balanced fashion, and we continue to partner with them to meet the strong and growing demand. We are receiving every opportunity to capture long-term customer commitments and investing in spot buys, as Dave mentioned, to procure essential product components to take care of the delivery for our customers.
Moving to the column on the right and to our growth investments. I want to talk about 2 specific investments. First, our IT channel business; and second, our Vertiv Product Development initiative. For the channel, our channel is growing and is part of our strategy and our growth strategy for our business. We have spent time in listening to our partners.
We fine-tuned our strategy. We've built a new partner portal, developed augmented reality sales tools, added configurators, increased sales support and ramped up our digital presence in a quest to make Vertiv easy for our partners to do business with. These efforts are definitely paying dividends. Existing partnerships are being strengthened. New partnerships are being formed, and all partners are promoting Vertiv. By the numbers, we had a 50% increase in the number of resellers that are actively buying our products since this time last year. Customer base is up over 400% from Q2 of last year.
A second example of how one of our growth initiatives is performing can be illustrated with this customer success story. Green Mountain is a European colocation provider. Green Mountain recently selected Vertiv as a supplier for our, as they call it, our cutting-edge technology. A key executive from Green Mountain has gone on to say the sustainability of the product and the suppliers is a key factor when purchasing new equipment. Vertiv technologies are the most efficient I've seen, and this will further improve our overall sustainability.
The investments we are making in our Vertiv Product Development growth initiatives are helping us develop more cutting-edge and energy efficiency technologies for innovation, sustainability and expanding our list of customers. These are just 2 examples that demonstrate the progress we are making as we drive focus, resources on growth and investment areas.
Moving on to Slide 6. Well, pricing is never easy task, but this market has required it. We are estimating having $65 million of pricing actions for the full year versus 2020. As you can see, though, by the time we get to Q4, we will have pricing that fully offset inflationary costs.
Moving to the second column. Inflation is being felt by us in material, freight cost and spot buys. Approximately $60 million in materials, $15 million in freight and $35 million in spot buys. We expect the cost impacts to ramp down in 2022 driving net tailwinds. David will provide additional commentary.
The third column depicts how we expect our contribution margin to evolve over the next 2 quarters. The timing of pricing versus inflation causing a dip in Q2. The pricing actions will accelerate in Q3, driving margin recovery. We anticipate full recovery by Q4 as headwinds stabilize and the pricing plan is fully implemented. And as mentioned, we're expecting a net tailwind in 2022 for this activity. So while we've experienced some short-term cost impacts, pricing is coming and customer investments we are making in are in the short term and will, over the long term, continue to drive shareholder value.
With that, I'll turn it over to David for a closer look at our Q2 numbers, and we'll come back at the end with some final comments. David?
David J. Fallon - CFO
Great. Thanks, Rob. Turning to Page 7. This slide summarizes our second quarter financial results versus last year. Net sales were up $254 million or 25% and 20% when adjusted for a $50 million foreign exchange tailwind. We continued our strong momentum with second quarter orders, as Rob mentioned, which were up 24% after increasing over 20% in the first quarter.
Adjusted operating profit increased $31 million or 30%, primarily driven by the profit flow-through from higher sales. However, as discussed, our contribution margin in the second quarter was negatively influenced by material and freight inflation, which impacted our second quarter P&L in advance of much of the favorable pricing expected to materially benefit the second half of the year. The negative impact of net inflation on contribution margin in the second quarter was approximately $25 million with another $10 million impacting contribution margin driven by the plant inefficiencies driven by the supply chain environment.
Fixed costs were up $20 million from last year's second quarter, including $30 million from last year's onetime COVID cost actions and $20 million from incremental growth in ER&D investments, both partially offset by continued fixed cost reduction initiatives and an impairment of capitalized software recognized in last year's second quarter.
Our adjusted earnings per share increased $0.15 to $0.31, primarily on the strength of higher adjusted operating profit and lower interest and income tax expense. Free cash flow was down $20 million from last year's second quarter. But as we discussed in our first quarter conference call, free cash flow in the first quarter was positively impacted by $25 million due to the delay of the cash disbursement at the end of the first quarter as a result of the systems implementation. And of course, this timing also negatively impacted second quarter free cash flow by the same $25 million. Otherwise, free cash flow would have been in line with last year's second quarter.
Turning to Page 8. This slide summarizes our second quarter segment results. Net sales in the Americas were up $80 million or 16.5%, driven by strong double-digit growth across all 3 product segments. Net sales in APAC were up $75 million or 23%, with growth across most of the APAC subregions, product segments and market verticals.
Net sales in EMEA were up $99 million or an impressive 50%, 41% organic, predominantly in the critical infrastructure and solutions products segment driven by several larger colocation projects. From a profitability perspective, adjusted operating margin declined in both the Americas and APAC, with both regions negatively impacted by material and freight inflation with Americas disproportionately impacted due to regional differences in commodity markets and higher electronic spot buys to support a larger channel business.
Adjusted operating profit improved in EMEA despite inflation challenges due to the leverage benefit of lower fixed costs on a significantly higher net sales base. Once again, this demonstrates the margin benefit of maintaining or reducing fixed costs while growing the top line. You may have heard the philosophy of keeping fixed cost constant. So this is once again, a real applicable example of that.
Next turning to Slide 9. This chart bridges second quarter free cash flow from last year. The year-over-year benefit from higher adjusted operating profit and lower cash interest payments was more than offset by several unfavorable variances including $20 million in cash taxes driven by lower estimated payments in last year's second quarter, primarily due to COVID uncertainty.
And we also had an additional $18 million outflow from inventory as we have proactively invested in inventory to satisfy customer demand in this challenging supply chain environment. Despite the unfavorable quarterly year-over-year comparison, year-to-date free cash flow is still $225 million higher than the same period last year. Last on this slide, we ended the second quarter with a record high liquidity of $1.1 billion and a record low net leverage -- net debt leverage ratio of 2.2x.
Next turning to Slide 10. This slide summarizes our third quarter financial guidance. We expect first half top line momentum to continue into the third quarter, with net sales up 10% at the midpoint, including a double-digit growth in EMEA and upper single-digit growth in Americas and APAC. So we expect the growth momentum to continue to cross all 3 regions.
This sales guidance assumes $25 million year-over-year benefit from pricing. And that's probably a little bit more proportionately directed at the Americas versus the other 2 regions. We guide towards adjusted operating profit of $160 million at the midpoint, up $92 million from last year. But as a reminder, we recognized an $80 million combined charge in last year's third quarter for restructuring and an asset impairment. This adjusted operating profit guidance assumes that the third quarter benefit from pricing does not quite offset the negative impact from inflation. However, we do anticipate a full offset pricing versus inflation in the fourth quarter.
Finally, adjusted EPS is expected to increase approximately $0.23 at the midpoint, primarily driven by the $8 million restructuring and asset impairment charge in last year's third quarter as the EPS benefits from incremental volume are offset by headwinds from net price inflation and last year's COVID actions, which were still $10 million in the third quarter of 2020.
Next turning to Slide 11. We summarize our revised full year 2021 financial guidance, including net sales of $5 billion, up 14% from 2020 and $100 million higher than our prior guidance. We are increasing our adjusted operating profit guidance to $600 million, up $5 million from prior guidance. And we will provide some detail of dollar increase on the next slide. We are taking down our full year estimate for adjusted operating margin by approximately 10 basis points at the midpoint. There are several moving pieces to our updated operating profit guidance, which certainly impact operating margin.
Some of these are favorable; some are unfavorable as illustrated on the next slide. But in the macro, the reduction is driven by the additional net inflation and related costs, offset by fixed cost actions we have initiated, including controlling discretionary spending.
For the avoidance of any doubt, we are reaffirming our adjusted operating margin targets of 16% in the intermediate term and 20% in the long term. We believe the net inflation headwind is an unfortunate 2021 dynamic due to constrained supply chains coming out of COVID. And we believe the pricing actions we are implementing today will generate a nice tailwind for 2022. And we are certainly incurring costs today to satisfy customer needs currently, and I'm referring to the spot buys and expedited freight, that we consider a long-term investment in our customer relationships, which can be referenced as winning later.
Even though it is hypothetical, at least on paper without the $45 million net inflation headwinds, we could be discussing adjusted operating profit in the $645 million range for 2020 as growth remains robust, with net sales now expected to be $225 million at the midpoint higher than our beginning-of-the-year estimates.
Full year adjusted EPS is expected to be $1.15, $0.04 higher than our prior full year guidance, driven by the $5 million increase in adjusted operating profit, about $0.01, and $11 million lower full year tax expense contributing about $0.03. And that was primarily the result of a discrete tax benefit that we recognized in the second quarter.
Finally, we are maintaining our full year projected free cash flow guidance of $300 million, which is up almost $140 million from full year 2020. We discussed internally whether we should increase our full year free cash flow guidance, but we are holding flat due to uncertainty in the supply chain, we generally realize a really nice cash inflow in the fourth quarter from the reduction of inventory, but we want to wait another quarter to see how that plays out for this year. With that said, we do like the upper end of the range of our $290 million to $310 million free cash flow full year guidance.
Next, turning to Slide 12. This chart bridges our full year adjusted operating profit from prior guidance of $5 million increase. On the prior slide, we noted a $100 million net sales increase. The components of this increase include $40 million of pricing mostly in the second half, $15 million of foreign exchange translation almost entirely in the second quarter and $45 million of volume with $35 million of that in the second quarter and $10 million in the second half. The $40 million of pricing is depicted in the first green bar.
The second green bar reflects the benefits of various fixed cost reduction actions we implemented in the second quarter, including controlling discretionary spending, and this should benefit the remainder of 2021. The third green bar reflects the expected flow-through from the $40 million to $45 million incremental organic volume.
The 2 largest red bars on this page reflect our updated views on the impact of supply chain challenges in 2021. This represents combined about $65 million of higher cost compared to our previous guidance with an incremental $20 million realized in the second quarter and $45 million added to the second half. Finally, on this slide, the last red bar on the right reflects expected headwinds from our prior guidance related to timing delays in productivity, both in purchasing and in the plant as a result of the current supply chain environment.
With that said, I turn it back over to Rob. Rob?
Robert J. Johnson - CEO & Director
Thanks, David. Turning to Slide 13, which is our last slide, recap the key messages for the quarter. As I close, I want you to know how proud I am with the Vertiv team and what we're doing together as a one Vertiv company. We've accomplished a great first half of the year. The results we've shared today reflect the hard work and commitment of the 20,000 employees, some in the factories, some in the field and some in the offices and some still working remotely in over 130 countries around the world.
As I look at the remaining months of 2021 and as we continue to invest strategically, I'm confident that we'll see above-market top line growth and increase in profitability and a strengthening balance sheet. When I look down the road at 2022 and beyond, my confidence is bolstered by the conversations that I've had personally with partners and key customers about the demand, pricing and pipeline.
To all employees, I'm grateful for the part you've played in the past 3 months and have allowed me to provide today's earnings report. Thank you for your dedication and your tireless effort to take care of our customers. To our investors, thank you for being on the call today and for your trust and support in Vertiv. It is truly my pleasure to be leading Vertiv.
I will now turn the call over to the operator who will open up the line for questions.
Operator
(Operator Instructions) The first question comes from Nigel Coe with Wolfe Research.
Nigel Edward Coe - MD & Senior Research Analyst
So surprise, surprise, a question on price. So the $65 million, how do we interpret that? Are these actions already made to the customers? And Obviously, there's an assumption about how much fixed and how much is given away in, I don't know, concessions, et cetera. Is this $65 million sort of like what's been actioned and what we hope to get? Or is this a conservative view on sort of how much of this price mix? And then maybe just talk about Americas versus APAC and EMEA.
Robert J. Johnson - CEO & Director
Okay. Nigel, thanks for your question. This is Rob. I'll start off and then let Gary and David weigh in. Pricing actions were actually underway at the beginning of Q2 as we begin to see this inflationary environment. As you know, we feed a lot off of our backlog. And some of those things in our backlog, we can look at price, we can look at freight. But for the most part, as we've indicated on the call, you'll see that really kind of come to life in Q3 and Q4. So we know orders that we got in Q2 that we'll ship in Q3, Q4, Q1, we know we got price on those. So that's why we feel confident that we will get the price and we are getting the price. So that's the first thing.
The same thing we've done which has been talked about widely with industrials is the ability to get price in the channel and distribution. That's a much faster lever from that perspective. But for us, as a company compared to other industrials, we're a smaller player in that, but that's an area that we're growing fast.
So we have taken pricing actions in some cases, 3 times within that space that will -- we've seen stick, and we've seen our order growth rates, as you can see in our channels beginning to grow at the pace that we've talked about in the past. We expect to continue to take share in that space while we continue to raise price and drive that. I don't know, any other comments, Gary or David?
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. Nigel, Gary here. I think Rob hit the nail on the head. The only 2 other parts I'd add to your question are we do think most of the pricing that we're going to get right now is sticky. It's not going to be 100%, but the majority of that pricing should be sticky as we head into 2022. And as Rob mentioned in his opening comments, that should provide some tailwind for us throughout that next year.
And then secondly, regional breakdown, I think the other part of your question was. There's a good chunk of this pricing, the majority of it that sits in Americas. So we're taking actions in all 3 regions. But just to your regional mix question, there certainly is a majority of the pricing that's going to happen in the Americas as well.
Nigel Edward Coe - MD & Senior Research Analyst
That's great. And then a quick one on your comments on 2022. Obviously, we're a little bit early to start talking about 2022. But the tailwind that you alluded to, is it really more a case of the spot purchases and the export of freight going away so we get that $35 million tailwind? Or do you see other benefits next year?
Robert J. Johnson - CEO & Director
I think we see that as well as we see continued -- the pricing that we're getting now for stuff that's going to be rolling out in 2022. And my comments earlier, Nigel, as well fairly bullish on 2022 just based on pipeline based on what we're seeing. I spend a lot of time with our customers understanding. And we get a question asked very frequently, is this typically a build and fill, build and fill. And what we're all seeing right now is a continued build and build responsibly. The fill rates are quite high. So it gives us great confidence that we would expect to have a really good 2022.
Operator
The next question comes from Jeff Sprague with Vertical Research.
Jeffrey Todd Sprague - Founder & Managing Partner
Just to pick up a little bit more on price, I fully understand kind of the carryover impact you'd be expecting based on how you think you'll exit the year. Just wonder what the behavior is, though, if we get some deflation. Is it -- has it been your experience that you can hold pricing in a modest deflationary period of time? I would assume that price comes down at lag, so you probably get some benefit from there. But just wondering about kind of the overall stickiness and as they reach kind of the new higher level on pricing.
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. Good question, Jeff. It's Gary again. So I would say that just like you're right on the way up on the inflationary, it takes a couple of quarters. And if there's a deflationary environment, it would certainly take a couple of quarters to lag on the way down. But with that said, most of the actions we have implemented, we do believe are going to be pretty sticky. I mean there's a couple of onetime type things or things that probably aren't going to carry into 2022.
But for the most part, the actions we are taking are really around list prices and multipliers and discounts. And those things in our environment tend to stick around more often than not. And the other reason we feel pretty good about that is just going back to what we were able to do in '19 and '20 with pricing, both in the $20 million-ish range. That should be sort of the lowest watermark as we think about anything in a normalized state. So overall, feel pretty good about where we sit for pricing as we go into '22.
Jeffrey Todd Sprague - Founder & Managing Partner
And then just on the fixed cost effort, the $30 million you've shown us here in the bridge, would this represent, I guess, maybe for a lack of a better phase, kind of an acceleration of what you were doing on this journey to get to 16%? Or is there some temporary actions here that have to (technical difficulty) way? Maybe you could just give us a little bit more context on the self-help levers that you're using, a, to try to combat inflation; and b, against the higher margin rate.
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. I think it's a combination of the 2, Jeff, meaning some is related to an acceleration of some of the cost actions that we planned at the beginning of the year. The others, it's hard to call them temporary because they're related to assumption with COVID opening up. So in our beginning of the year guidance, we anticipated that the world was going to open up in 2Q with travel and other discretionary costs, that's probably getting pushed out to the third or fourth quarter.
So we're certainly going to benefit from lower discretionary costs there. But we've been able to accelerate some of the other fixed cost reductions. It's hard to quantify how much of that $30 million is going to carry over. If I were to pick a proportion, it's probably 50-50. There's probably 50% temporary, and there's probably 50% that is an acceleration of permanent things that we had in the hopper anyhow.
Operator
The next question comes from Andrew Obin with Bank of America.
David Emerson Ridley-Lane - VP
This is David Ridley-Lane on for Andrew Obin. What's the size of shipments you couldn't make in the second quarter due to the supply chain issues? Or said differently, what portion of that sequential growth you had in your backlog is due to supply chain issues?
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. So I think very clearly, the costs are much easier to quantify than hypothetical lost sales. With that said, it certainly is greater than 0. The way I think is the best way to understand it is if you look at the second half of the year, what we have built into our guidance is probably somewhat conservative based on what we're anticipating as continued supply chain constraints. And that could amount to anywhere between 200 to 300 basis points of growth in the back half of the year that we believe could be constrained because of the availability of parts.
So if you were to dollarize that, that's in the tens of millions of dollars. So it certainly isn't insignificant. I think we've gotten some feedback that there's a belief that our top line guide in the second half is somewhat conservative. And it could be built-in provision for what we think is a realistic scenario as it relates to being able to obtain parts.
David Emerson Ridley-Lane - VP
Got it. And are you hearing that competitors are having sort of similar issues with -- in terms of on-time delivery and parts availability?
Robert J. Johnson - CEO & Director
Yes. David, Rob Johnson here. Absolutely. And it's not just our equipment. It's across the board, whether it's steel, plastics for the construction of the building. It's really hit everybody. So I would say, in general, we're seeing lead times, for example, on things like generators and stuff that we don't sell, but go -- moving out. And it's happening pretty much to everybody. We're trying to all get after some of the same parts, whether it's fans or lithium-ion or discrete electrical components, yes, it's pretty much across the board for everyone.
David Emerson Ridley-Lane - VP
Got it. And then I know this might be a little tough to answer, but sort of what's the status quo price-cost benefit you would receive in 2022, if you just assume fourth quarter pricing actions hold for that year and material and freight cost hold for the year at sort of fourth quarter levels?
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. I think a fairly rudimentary way to look at this. If you look at Slide 6, you see the pricing bars on the left and the material freight inflation on the right. Effectively, the white space above each of those quarterly bars would be the opportunity -- the upside opportunity from pricing. And the down potential detriment from material and freight inflation, predominantly the white space in that first quarter chart.
So definitely, there's a tailwind from pricing. Don't necessarily want to quantify it for all the reasons we discussed. We're not 100% sure that it will all stick. The one thing that is clear from that chart is if -- what we're seeing in the Q4 for both price and inflation continues into next year, we certainly should see a net tailwind, part of it because of the overlap of timing, the cost certainly hit us sooner this year than the benefit of pricing.
Operator
The next question comes from Scott Davis with Melius Research.
Scott Reed Davis - Founding Partner, Chairman, CEO & Research Analyst of Multi-Industry Research
At risk of asking a stupid question, can you give us a sense of kind of the spot buys are most -- where you guys are most aggressive, what kind of bill of materials?
Robert J. Johnson - CEO & Director
It's kind of a combination, certainly electronic components when we can get those. In the past, it's been things like IGBTs, certainly lithium-ion batteries have driven that and kind of a combination of areas around -- really focus there. Fans, I guess I would say, go into that category as well. So yes, that's -- and then there's -- included in some of the spot buys is, for example, the channel. We know that if we don't have the product, we lose the order, it goes to somebody else. So we've had to do some expediting and spot buys in there for certain components for our channel products, our single-phase UPSs, our rack-mount PDUs, those types of things.
Scott Reed Davis - Founding Partner, Chairman, CEO & Research Analyst of Multi-Industry Research
Yes, that makes sense. And in that context, when you think about some of the -- I mean, obviously, your main markets are fairly consolidated, but you do have some peripheral players here and there. I mean, I would think some of those guys might be suffering right now and perhaps lower down on the list of being able to get materials and things like that. Is there an opportunity right now on the M&A side to kind of participate in kind of another level of consolidation for some of the smaller suppliers around the peripheral, just that may be suffering a bit right now? Does that make sense?
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. Scott, Gary. I think your logic flow is very just that logical. I would say that we're being pretty measured still in the M&A philosophy to say we want anything we do to go back to the 4 key tenets that we've talked about of why we'd want to acquire a company. There are some people that have reached out to us and said, this has been a difficult time, we want to partner with you. Yes, there's been a few more probably inbound calls.
But I think from our standpoint, we really still stick to the 4 key strategic tenants of why we want to acquire a company. If one of those companies have to be struggling, great, certainly an opportunity there, but we're going to stay pretty true to the types of companies we want to buy, not just because they may be struggling in this environment.
Operator
The next question comes from Nicole DeBlase with Deutsche Bank.
Nicole Sheree DeBlase - Director & Lead Analyst
I just wanted to ask my first one, a follow-up on Nigel's question earlier. So understanding that the majority of the pricing actions are benefiting the Americas, I assume, is that also the case for the inflation predominantly impacting Americas? And maybe as part of the answer to that question, if you want to give any color around what you're thinking for margin trajectory in the 3Q guidance, that would also be helpful.
David J. Fallon - CFO
Got it. So Nicole, this is David. The one thing that we certainly have learned through the 2021 environment is that the supply chains are regional. So the impact of one region is certainly different than the impact in other regions. And we certainly can probably have a conversation on the drivers of that dynamic.
But at the end of the day, what we're seeing is if you look at both the cost impact, inflation and spot buy and also the response for pricing, about 60% of what we're seeing is in the Americas. And the remainder fairly equally split between the other 2 regions. But just to understand the disproportionality there, Americas is about 45% of our company, but it's seen 60% of the impact of inflation. And of course, our pricing response there is stronger as well.
Nicole Sheree DeBlase - Director & Lead Analyst
Okay. Got it. And anything on just margins in the back half or in the third quarter by segment? Or is it just Americas probably looking the worst and then EMEA and APAC a little bit better on a year-on-year basis?
David J. Fallon - CFO
That's certainly the case. The Americas -- depends if you look at it versus prior year versus your prior guidance, but the incremental cost that we included in the back half of the year are definitely proportionate to the Americas. If I'm remodeling, I would certainly model the Americas down. But with that said, for avoidance of doubt, the net inflation certainly impacts all 3 regions when you get down to the adjusted operating profit line item.
The other 2 regions, notably EMEA, probably is relatively flat in part because some of the volume increase that we included in the guidance is probably disproportionate to EMEA as well. So that certainly helps from a fixed cost leverage. But all other things being equal, it certainly is disproportionate to the Americas.
Nicole Sheree DeBlase - Director & Lead Analyst
Okay. Got it. That's really helpful. And then I guess on mix, I mean, obviously, price cost is kind of overshadowing other impacts to margins right now. But is there anything on mix that we should be thinking about in the second half as maybe service ramps or other dynamics?
David J. Fallon - CFO
No. We have a little bit of a mix dynamic for the full year related to higher growth in the critical infrastructure and solutions segments, and you can see that certainly on a year-to-date basis. We don't think there is anything significantly different that we'll see in the second half that we have not seen in the first half from a mix perspective.
But certainly, the growth in that CI&S is expected to be a little bit higher than the 2 product segments. From a regional perspective, because the growth -- the sales growth we're seeing is in disproportionate to EMEA and EMEA's contribution margins are fairly close to the Americas, so we're not necessarily seeing a negative regional mix. So what we would see from a mix perspective certainly would be from a product perspective.
Operator
The next question comes from Mark Delaney with Goldman Sachs.
Mark Trevor Delaney - Equity Analyst
Just wondering if you could talk more about your expectation on supply chain costs and component availability going forward. And any outlook you may have as to when the cost pressures and supply tightness may begin to alleviate? Related to that, if cost does go up again in the fourth quarter, do you think your outlook that you can offset this cost inflation with pricing? Would that still hold to the extent pricing continued to go up in 4Q?
Robert J. Johnson - CEO & Director
Thanks, Mark. I'll start off and then David, any comments there. But I would say, in general, we think things have leveled out as it relates to the cost. But again, it's always a supply and demand thing, and we'll continue to watch that. And if they continue to creep up, then we're going to have to crack prices up and continue to do that. So we use that lever to be fair to our customers, though, we're looking to cover our cost in this environment.
As far as the easing of supply, it's going to be a combination of things that are happening. Certainly, chip fabs, we're in touch with some of the largest ones that we use to understand when they get additional capacity come on. And at the end of this year, there's some capacity and then towards the middle of 2022.
So once that capacity comes online, we'll feel better about the overall components chip level anyway. We do know that whether it's fans or even lithium-ion, additional capacity is being brought online and gives us comfort in the future that we'll be able to see some of those constraints ease as well. That being said, our supply chain team has been very proactive in negotiating longer-term supply agreements, making commitments for supply longer than we normally would to be able to assure our supply as we get into 2022.
Mark Trevor Delaney - Equity Analyst
That's helpful. And for my second question, I was hoping to better understand the order growth of some of the components behind that. I believe the company said more than 20% order growth for 2 quarters in a row now. Maybe you could help break that down a little bit further in terms of how much is coming from growth and demand? How much is perhaps share gain? And then is there potentially a piece of this that is customers placing orders sooner than they normally would, given some of the global supply chain challenges?
Robert J. Johnson - CEO & Director
Mark, this is Rob again. I'll start, and then Gary will come in over the top. A couple of things that we believe the dynamics are happening here. Our plan is working, and our plan was to gain share in the colo and hyperscale space and traditionally against probably local companies that you wouldn't be aware of in various parts of the region.
We've been executing quite well there and seeing those orders flip in our direction. So part of our growth is just, hey, we're taking (inaudible) some share in the smaller, more regional-based companies that you would recognize. I would say that, again, kind of similar thing in the channel. We've posted up some nice growth (inaudible) channel with our various new innovative products finding that we need to take some share there as well, and we get data on that on a monthly basis on how we're doing. So we feel good about that.
What we will see, I think, and saw a little bit of going forward is people wanting to get their slotting for 2022 to assure supply because everyone is experiencing the lack of supply customer wise. So I think we'll see an acceleration of people putting just like we have on our supply base, longer-term orders in place fixed and firm in order to be able to ensure that they can get their product when they need it. I don't know, any other thoughts, Gary?
Gary John Niederpruem - Chief Strategy & Development Officer
Yes. No, I think, Mark, I think, Rob nailed it spot on. And we definitely continue to see the (technical difficulty). I would say that 20% of the first half growth, there's probably a pretty good chance that the market hasn't grown anywhere near that.
And so I think with the latest updated guide even for the full year, we're at, what, close to 13%, 14% organic. And I think our best estimates right now is the market is probably growing maybe upper single digits, still a little fuzzy to tell exactly, but I think clearly, there's great momentum, not only there's good market -- there's good market demand right now. And there's also a really good penetration happening by our sales and marketing and product development teams.
And Mark, one other thing to add there that I'm super excited about, David kind of mentioned that our investments are paying off in our VPDs. And an example of that is our -- one of our large cooling units that doesn't use water, innovative technology. In this area, we've been displacing other traditional technologies, maybe water cooled systems in that space.
So we're seeing the investment in the R&D is ramping that and the products now coming out the door are truly innovative and allow for us to take share from that perspective. So we're very excited. Lot more to come there. I know we talked about it on the last call, some of those products, but I continue to be excited in both the channel for colo, hyperscale, even our enterprise customers and Edge customers, the stuff that we've got in the pipeline and the stuff that's already hit the ground that is really aiding us and getting above-market growth rate.
Operator
The next question comes from Steve Tusa with JPMorgan.
Charles Stephen Tusa - MD
I think -- I'm not sure if you guys have talked about it this way in the past, but what was your book-to-bill in the quarter?
Lynne M. Maxeiner - VP of Global Treasury & IR
Yes. Sorry, I think we're having audio difficulties. Can you hear me okay, Steve?
Charles Stephen Tusa - MD
Yes. Yes.
Lynne M. Maxeiner - VP of Global Treasury & IR
Yes. Sorry about that. I think -- I'm not sure if some of the management are having an audio difficulties. But I think you're right, I mean book-to-bill is traditionally not a statistical ratio that we speak about externally. But I think if you look at just the order growth that we've seen over the past couple of quarters in excess of 20% which has been -- we've also posted really strong sales growth in those orders, too, but the momentum on orders has just been very strong, but the bill isn't something that we've externally.
Charles Stephen Tusa - MD
Okay. And then just on kind of the second half commodity forecast. I mean you're kind of calling it flat year-over-year. I think there are other companies out there that are definitely calling for it to kind of step up in the back half a little bit more. Is there something about how you guys hedge these costs or your assumptions around price movements that would impact that? Or maybe you're just having different volume trends in these other guys where you grew better last year?
I don't know. Is there any -- what's kind of the underlying assumption for that flat guidance for the second half on the commodes?
David J. Fallon - CFO
Yes. It's based on what we're seeing in each of the regions. And as I mentioned, there's definitely regional differences. I would say we feel pretty good with where we're locked in as it relates in the forecast as it relates to APAC and EMEA the price increases from a steel perspective, as an example, certainly, were more pronounced in the Americas than the other 2 regions.
So I would say if we do have uncertainty, it's related to what we're seeing in the Americas. With that said, I think what we have assumed in our forecast for Q3 and Q4 is actually slightly higher than what we're seeing currently. So even though it's below Q2, it's slightly lower than what we're seeing currently.
And we've seen some stabilization in some of our input costs over the last 30 to 45 days. At the end of the day, we don't 100% know what's going to happen, but we believe we have enough of conservatism from a cost perspective built in. And the other dynamic to that is related to the spot buys. And as we mentioned, that's primarily related to electronic components, and we're certainly not unique in having that issue. That's a dynamic that we certainly believe can extend into 2022.
But what we've included in the back half of the year is a combination of what we're seeing in market and also managed. So we certainly have an election whether to do a spot buy or not to do a spot buy, and we're making that decision based on a profitability algorithm, meaning we're not going to execute spot buys for every single order, but we certainly will prioritize those decisions based on what we're seeing on the demand side in the short run.
Operator
The next question comes from Lance Vitanza with Cowen.
Lance William Vitanza - MD & Cross-Capital Structure Analyst
On Slide 9, with respect to cash taxes and the inventory impact there, the inventory, $18 million of incremental inventory build over what I guess, what you did in 2Q '20, when should we expect to see the reversal of that back into cash flow as at some point you begin to work off the inventory build? And will we expect to see -- or should we expect to see additional inventory building before we get to that point?
David J. Fallon - CFO
Yes. Thanks for the question. So if you look back at our historical cash flow generation from a quarterly perspective, we certainly have a pronounced uptick in the fourth quarter. Part of that is because of the higher volume that we see. And we generally build inventory during the year and then bleed it down in the fourth quarter.
So I would say normally that dynamic happens in the fourth quarter. And as I mentioned, the reason we did not take our free cash flow full year guidance up in the current guidance is a little bit because of the dynamic of what you're questioning. So it may make strategic sense for us to continue to build inventory, notably with electronic parts as it relates to adding some insurance heading into next year.
So all other things being equal, the standard answer is generally, we would see that cash flow impact in the fourth quarter. This year, we're going to wait probably till sometime at the end of the third quarter, early fourth quarter to see if it makes sense to continue that inventory investment.
Lance William Vitanza - MD & Cross-Capital Structure Analyst
Perfect. And then on the tax [rate], you mentioned that part of it is timing, part of it is just higher -- just the operating profit. Can you help us -- is it sort of 50-50 in terms of those 2 items? And how much would you say is (technical difficulty)?
David J. Fallon - CFO
Yes. From a cash tax perspective, that's clearly related to timing last year. So our estimated cash tax payments in the second quarter of 2020 were probably artificially low based on our actual profits we were seeing on a year-to-date basis and also our expectations for the full year. So that's just the timing issue. I'll probably take this opportunity to maybe talk a little bit about the tax impact on the P&L.
So we did take our full year income tax expense down about $10 million, $11 million for the full year. If you look at our tax expense, in Q2, we guided closer to 2021, and our expense was actually about $1 million. So that's a $20 million P&L benefit. That's not necessarily tied to this $20 million cash variance just for -- just for clarity there.
But half of the $20 million P&L benefit was related to some legal entity restructuring we did in -- outside the U.S. That's a permanent benefit. The other $10 million was related to the ASC 740 accounting. So it's purely timing based. And a lot of that was unfortunately driven by the accounting we have to do for warrants, which pushed a lot of net $10 million expense in Q3 and probably more significantly in Q4. So probably more than what you're asking for from a tax perspective, but I thought there may be a question out there on that.
Lance William Vitanza - MD & Cross-Capital Structure Analyst
Appreciate it. The last one (technical difficulty) 2.2x net leverage that you called out on the slide, I would imagine the gross leverage is closer to 3x. But could you just remind us like where should we think that leverage, whether it's (inaudible) where do you think that's going to shape up a year from now, 2 years from now? And what other types of things should we be expecting you to use your cash from this $1 billion of liquidity that you have?
David J. Fallon - CFO
Yes. Thanks, Lance. So you're right. On a gross basis, gross leverage is probably 3.3x, and we had about $700 million of cash on our balance sheet at the (inaudible) that's what takes you down to the 2.2x, but we don't see that $700 million as burning a hole in our pocket So as we kind of mentioned, if you look at our priorities, we'll continue to pay down debt, but we certainly would like to use our balance sheet to look at some strategic acquisitions.
And when we started this journey about 18 months ago, our net leverage was net 6 to 6.5x. We were 4x when we SPAC. And sitting at 2.2x feels a lot better. We have always talked about probably a comfortable long-term range is in that 2 to 3x. But with that said, we would certainly be comfortable getting above 3x for the right deal. And we also would feel comfortable getting below 2x if that right deal was not available.
But from a prioritization perspective, we'll continue to pay down debt with certainly look at accretive strategic acquisitions. And if we're in a position we have to do something from a dividend perspective or a share repurchase perspective, we'll look at that when the time comes.
Operator
The next question comes from Andy Kaplowitz with Citigroup.
Andrew Alec Kaplowitz - MD and U.S. Industrial Sector Head
So you've mentioned that your pipeline and orders were continuing to improve in enterprise. Obviously, you didn't change any of your enterprise bubbles yet, but you did say that you could change them next quarter if current trends persist. So is it possible to quantify in some way what the recovery is looking like for you exiting Q2 in enterprise? And then ultimately, where have you seen the improved orders within enterprise? And what continuing trends are you looking at to turn enterprise from yellow to green?
Robert J. Johnson - CEO & Director
Yes. So Andy, I'll start with that. And what I'd say is we began to see kind of in the June time frame that enterprise began to pick up by evidence of some of the channel movements, right, typically, refreshes as people go back to the office and network closets and things like that need to be picked up and refresh since they've been sitting there for a while.
So that gives us some excitement about where it's going. We want to see that continue through Q3. And if we do, then you'll see that turn to green in terms of the buying, it is back. I would say, as we think about some of the hotter verticals right now in the enterprise area, it's certainly health care spending education spending some areas still kind of (inaudible) as the travel.
We certainly see financial institutions spending. So beginning we're post-COVID, but we've got this in-out thing still going on. We had talked about in previous calls that we have seen a lot of quote activity, a lot of engineering activity, and that is now being turned and placed into orders for us in the enterprise space. So I'm confident if it continues at the trajectory we saw in June that we'll be seeing a green there, and we'll be upwards in that enterprise space.
Andrew Alec Kaplowitz - MD and U.S. Industrial Sector Head
And to be clear, you haven't seen any falloff in that trajectory with delta being around here, it's still been pretty good in July?
Robert J. Johnson - CEO & Director
Yes, I would say without kind of going -- yes, we continue to see the trajectory and in the right direction for that enterprise business throughout July. Now again, it's early, lots of places are locking down with masks again. Again, we'll see what happens and what that does. But prior to all that, we are optimistic that we would be going green in Q3.
Andrew Alec Kaplowitz - MD and U.S. Industrial Sector Head
Great. And then it's great that you reiterate your medium-term adjusted operating margin target at 16% and reaching 20% I know you mentioned that the net tailwind from pricing in '22 happens. But does the current operating environment lead you to question at all the timing of the improvement? And then we know one of the main longer-term initiatives for Vertiv is to improve its pricing ability. So how would you assess your increased focus on dynamic pricing and how it's been working in the current environment?
Robert J. Johnson - CEO & Director
I'll start off and then, David, you can chime in, or Gary. But obviously, we're getting more and more sophisticated with our ways we get price. We've talked about it in the past where we've instituted some AI and really pricing tools that allow our salespeople to understand when we lose at what price and when we win. We're expanding those tools as we've talked in the past, throughout Europe and then Asia.
So this will continue to be a muscle that will flex and grow and get more and more mature and use more data analytics to drive it. So we continue to believe that pricing will be one of those levers that will continue to drive for years to come. But I feel good about where we're at. I feel good about the methodologies that we have and the ability to get that and really stemmed from a couple of years ago when we first started it, and we just continue to drive that. I don't know, David, any thoughts there?
David J. Fallon - CFO
No, 100% agree, Rob. So I think what -- this year, it does not impact our plan to continue to increase adjusted operating margins in that 16% in the long term 20% range. And if anything, what we have seen this year has actually allowed us to develop some muscle from a pricing perspective. So that's always been a part of the equation to improve margins. And I think what we've seen this year gives us even more confidence that we can use that as a lever to -- on our path to 16% and then 20%.
Operator
The next question comes from Amit Daryanani with Evercore.
Amit Jawaharlaz Daryanani - Senior MD & Fundamental Research Analyst
I guess I have 2 questions as well. First up, I just wanted to understand, given the decision to ensure you have supply and product availability versus near-term profits, is that resulting in new customer acquisitions, new wins? Or are you really trying to satisfy your existing customers? And if figures around new customers then, should we think about you structurally beyond '21 being able to exploit the share gains, which I think you talked about 1.5x industry growth historically?
Robert J. Johnson - CEO & Director
Yes. So I would say the -- first of all, thanks, Amit, for the question. This is Rob. I would say, absolutely, it's all customers, right, whether it's new or existing, we prioritize them as the orders come in and take care of them. And we've been very fair in our process. Certainly, with some of the new products that we've talked about the thermal management side and even some of the power management stuff and certainly channel, we feel like we have sustainable gain share there happening and we'll continue to see that momentum.
And that's how part of our whole story is innovation and driving innovation and using that to take market share from a lot of the, what I call, more local companies. So we've globalized some of these products through our Vertiv Product Development process. And we see this being very sticky for us going into the next years. And it's, again, part of our strategy to grow faster than market.
Amit Jawaharlaz Daryanani - Senior MD & Fundamental Research Analyst
Got it. And then I guess, David, when I look at your back half growth guide, you're implying 7% growth, 7.5% growth. Could you maybe contrast that with the full stack that's going to grow 24% and your backlog that's up 20% -- I guess, compares about, but why the decel in back half when your backlog is so strong?
David J. Fallon - CFO
Yes. I think there's 2 dynamics that are driving that. And companies often reference challenging comps. And at the end of the day, we target growth regardless of what the comps are. But we do because of the dynamics of what we saw with COVID in the first half of last year, notably in Q2. Some of those sales were pushed in the back half of the year. And notably the fourth quarter of last year, it creates a challenging comp. So that's number one.
Number two is, as we mentioned, there's probably a little bit of cushion or buffer or conservatism, however you want to describe it, built into what we're seeing as it relates to our expectations of sales that we won't necessarily be able to deliver because of some of the supply chain constraints. And I think if you look at the -- from a quarterly perspective, I think it's 8% organic growth in Q3, 4% in Q4. We believe what we're guiding to is certainly is a very doable number, and we hope there's some upside.
Operator
This concludes our question-and-answer session. I would like to turn the conference back over to Rob Johnson for any closing remarks.
Robert J. Johnson - CEO & Director
Okay. So all of you listening today and for your support, thank you again for the participation, the questions. As you can tell, I'm very excited about the demand for Vertiv products going forward for the rest of this year and well into 2022. So again, I appreciate the support, and this concludes the call for today.
Operator
The conference has now concluded. Thank you for attending today's presentation. You may now disconnect.