Rob Johnson
Analyst · Citigroup
Thanks, Dave. Thank you for your guidance that you provide to me and the executive team and the support for Vertiv that you always have given. We really appreciate it.
To all of you on today's call, thank you for being here, and I'm eager to share more about our performance for the first quarter, our outlook for the market and give you a glimpse of a few new products Dave just talked about that our talented and innovative teams at Vertiv have developed.
Turning to Slide 3. There are 5 key messages I want to convey today, and we'll share them at a high level, and David will elaborate more on the financial details in just a few minutes. First, I'm pleased to report sales were up more than 22%, and orders were up 21% versus Q1 of 2020. Growth happened in all regions across all major verticals, and we ended the quarter with a record high backlog of $2.1 billion.
Second, from a profitability standpoint, our adjusted operating profit was $112 million, which is up $92 million or 450% from last year's first quarter. This resulted in adjusted operating margin expansion of over 790 basis points, driven by higher sales and lower fixed cost on a percentage basis.
Third, our free cash flow at the end of Q1 was $43 million, an improvement of $246 million, made possible by higher earnings and lower interest expense.
Fourth, the market is facing supply chain and commodity cost challenges, and Vertiv is not exempt. We are aggressively working to secure supply needed so that we can provide on-time delivery to our customers, first and foremost, while developing and executing strategies to share the cost with our customers where possible. Because supply chain constraints, coupled with inflation, we will see some incremental unexpected costs over the short term.
And fifth, and the final key message, we are raising our 2021 sales guidance by $125 million, such that the new sales guidance is between $4.8 billion and $4.9 billion. And raising our adjusted operating profit guidance by $20 million. So our operating guidance is now $585 million to $605 million.
This demonstrates our confidence in the end markets and the confidence in our teams all across Vertiv to perform in accordance with our strategy and to meet the growing needs of our customers. Let me elaborate on these 5 key points using the next few slides.
Turning to Slide 4. We've been using this slide quarter-to-quarter to talk about our end markets and illustrate activity in each of our regions around the world. A red button on the slide indicates sluggish performance. A green bucket -- green button indicates strong performance. And a yellow button indicates something in between. Cloud and hyperscale and colocation markets have been very strong and remain strong across all regions. The demand for digital applications, online education, telemedicine, video and gaming is booming, benefiting our cloud and colocation customers and driving a strong and growing need for Vertiv products and services around the world.
In our enterprise, small and medium business market, we're seeing signs of improvement as well. Our 2 reds have now turned yellow, but it's still not clear when the entire enterprise segment will open up. We are, however, encouraged to see things moving in the right direction.
The communication networks market stayed constant in Americas and EMEA. It improved in APAC over the quarter, and we were able to see a shift in the market from yellow to green. Americas and APAC are performing strongly in this segment. Americas activity is driven by several large U.S. telecom carriers and the continued rollout of 5G.
In the commercial and industrial market this quarter, EMEA has shifted from red to yellow. And because of that, we are now showing solid yellows across all regions, indicating some positive movement in the commercial and industrial space.
All the end markets we serve are good -- are in very good shape now, as illustrated by the rays of yellows and green across the slide for Q1.
Digital applications continue to increase their importance in everyday life. There's no -- they're no longer nice to have but a necessity for individuals and for businesses. The increasing need means there's an increasing demand for the processing, storage and transmission of data, which creates significant opportunity for Vertiv, and we are perfectly poised to go after that opportunity.
Moving to Slide 5. I'd like to make a few comments regarding supply and demand. As I mentioned earlier, the overall market demand is strong, as evidenced by our order rates and backlog, which has resulted in us raising guidance. Each of our regions saw revenue growth in the first quarter, led by continued strength in cloud and colocation markets. Our cloud and colocation customers continue to build data centers in an aggressive but balanced fashion, and we will continue to partner with them to meet the strong and growing demand.
We continue to stay vigilant around COVID, keeping our employees, our customers and our partners safe wherever they are in the world. That is our main priority. We have made adaptations where necessary and have found solutions to business challenges brought on by COVID. We remain confident in our ability to serve our customers and meet their needs. Yet, similar to other companies, we are facing some supply chain issues due to market conditions.
There are a couple of things that are going on here. First, we find ourselves dealing with some parts shortages and materials. For the most part, we've identified solutions for those. Second, like many other companies, we are seeing cost increases on both material and the logistics side. This is being tracked and managed and closely monitored, and we are taking actions to offset the increased costs.
But nonetheless, this is a short-term headwind. We've been planning to implement some footprint optimization programs. We have pivoted and decided to delay some of those programs to take advantage of the strong demand environment. The footprint optimization plan will be executed, but it will happen a little bit later than originally expected.
Moving to Slide 6. I've talked to you in the past about our Vertiv product development process, VPD, and you all know about the allocations and resources we have made to research and development. So I wanted to show you a few of the new products. I can't tell you how thrilled I am with the progress that's being made in our engineering teams and all those that are responsible for executing our strategy to innovate, design and build products for the future.
Here are some early results on this slide. The first product, shown in the upper left, will formally be launched tomorrow, and it's another way that we're helping our customers to become more efficient and provide lower carbon offerings. It is a grid interactive UPS, which will allow data center operators to use the UPS to power their data center and during low power times, to inject power back into the grid to drive the efficient use of data center equipment.
On the upper right is the newest addition to our thermal offerings. We continue to innovate in the thermal space to drive more efficiencies and to provide best solutions for our customers. This product provides liquid cooling for high-density servers and racks, providing customers with an efficient way to cool their high-density applications.
Finally, on the bottom of the chart, you will see 2 of our new edge offerings. The product on the lower left is a small UPS that's very efficient, very compact and utilizes the latest in lithium battery technology for longer time back -- for longer backup time. The product on the lower right is our newest single rack data center, which includes integrated UPS, power distribution, thermal management and our secure switch. This is a preconfigured solution and is a great example of the type of product we are bringing to the market for distributed IT and new edge applications.
I really could talk hours about the research and development at Vertiv, but wanted to highlight a few of the new products so you can understand how we're focusing our R&D efforts and allowing us to bring these innovative solutions and offerings to our customers into the market.
With that, I'll turn it over to David for a closer look at the Q1 numbers and come back at the end with some final comments. David?