Doug Black
Analyst · Deutsche Bank
Thank you, Pascal. Good morning, and thank you for taking the time to join us on today's call. We're excited to be hosting our first earnings call as a publicly traded company following the successful completion of our initial public offering in May. This offering was a result of a lot of hard work and dedication, and I would like to take the time to thank all of those involved in the process. We look forward to this next chapter in the story of SiteOne Landscape Supply as we execute our strategy on the behalf of our new shareholders.
I would like to start today's call by providing a brief overview of our business and our strategy for any listeners that may be new to the SiteOne story, followed by some highlights of our first quarter results. I'll then pass the call on to John Guthrie, who will walk through our financial results in more detail. Pascal Convers will then provide an update on our corporate development initiatives and then finally, I will come back to provide some comments on our outlook and then make some closing remarks before opening up the line for your questions.
Turning to Slide 3. You can see that we are the largest and only national wholesale distributor of landscape supplies in the U.S. We hold an approximate 9% share of the highly fragmented $16 billion landscaping products distribution market. And we are about 4x the size of our closest competitor. The market is expected to grow meaningfully faster than GDP in the coming years, driven by ongoing maintenance of landscapes, which comprises approximately 45% of our sales, as well as robust investment in landscape remodeling and the ongoing commercial and residential new construction recovery.
Our customers are professional landscape contractors and maintainers, who are typically small to mid-sized regional or local companies. And we serve them through our footprint of 466 stores in 45 U.S. states and 5 Canadian provinces.
Slide 4 highlights the fragmented nature of the market and the key role that we play in the value chain. The landscape supply market lends itself the wholesale distribution with thousands of suppliers trying to reach hundreds of thousands of customers. We serve as a one-stop shop in a market, which is unique and are able to meet our customers' needs in ways that retailers and small competitors cannot.
Additionally, we are critical business partner for both our suppliers and our customers. For our suppliers, we provide an unrivaled conduit to the market while assisting them in growing their business and deploying new products and new technologies. For our customers, we provide not only the full breadth of products and services, but also critical business assistance to help them solve problems, find and bid projects, train their employees and win in the marketplace.
Slide 5 shows the range of our product offering. Our key product categories include irrigation, fertilizer, controlled products, nurturing material, landscape accessories, hardscapes and outdoor lighting. Across these categories, we offer approximately 100,000 SKUs and are the #1 wholesale distributor in each of these 7 major product lines. Our ability to provide the full breadth of landscaping products gives us important synergies and competitive advantages while providing a nice balance across maintenance, remodel and new construction as well as across customers and construction sectors, residential, commercial and recreational.
I would like to also highlight that we own the LESCO brand, which is the #1 maintenance brand for industry professionals and comprises over 20% of our total sales.
Turning to Slide 6. We are executing a strategy that we believe provides distinct opportunities to grow our business and expand our profitability both in the near term and over the long term. We combine the scale advantages and the capabilities of a large company with our passionate and entrepreneurial local teams in order to deliver superior value to our customers and our suppliers. This allows us to gain market share and achieve consistent superior organic growth and profitability. We complement our organic growth with acquisitive growth to achieve strong results for our stakeholders while extending our lead over the competition.
In addition to organic and acquisition growth, we also have the opportunity to expand our EBITDA margin as we execute our commercial and operational excellence initiatives. We are in the early innings of these initiatives covering pricing, category management, supply chain, sales force performance and marketing. These initiatives contributed a robust 320 basis points of gross margin expansion in 2015. And as you can see from our first quarter numbers, we are continuing to see good results from our initiatives in 2016.
Turning to Slide 7, we are pleased with our financial and operational performance in the first quarter as we delivered strong results for the 3 months ended April 3, 2016. Net sales increased by 45% year-over-year. We generated significant organic revenue growth of 23%, while acquisitions contributed another 22% of revenue growth. Our organic growth was certainly aided by the favorable weather in February and March. However, it also reflects a strong underlying market and our continued execution.
Gross margin expanded by 350 basis points to 29.5% as we continue to benefit from our operational and commercial initiatives that I mentioned earlier. Adjusted EBITDA increased to $4.5 million compared to a loss of $5.7 million a year ago. The first quarter is typically our weakest quarter from a seasonal standpoint, both in terms of revenue and profitability, so I'm very pleased with the strong results that we delivered.
I'd like to go into a little more detail about how the weather impacts our business and specifically, how the unusually favorable weather impacted our first quarter results in 2016. Temperatures across the United States were warmer than usual in February and March, which allowed the season to start earlier, and thereby, increase the demand for our products.
Landscape construction contractors were able to start working on projects earlier, particularly in the northern markets. And the early spring resulted in fertilizer and combination product applications going down earlier when compared to the prior year. As a result of the positive weather conditions in our first quarter, some sales were pulled forward from the second quarter to the first quarter. Weather is something that we certainly pay close attention to, and the weather does tend to move demand around from month-to-month and from quarter-to-quarter during the year. However, barring any highly unusual events, things tend to balance themselves out over the course of a full year.
During the first quarter, we continue to execute on our acquisition strategy. We acquired Hydro-Scape Products in January and Blue Max Materials at the start of the second quarter in April. These acquisitions move us into a leading position in irrigation for Southern California and in hardscapes for the Carolinas. Pascal will get into additional details on these later in the call.
We are very focused on building the best team in the industry, which is an important advantage for SiteOne Landscape Supply. And I'm pleased that we continue to strengthen our talent in 2016 with key hires in HR, IT, supply chain, pricing and in the field. And finally, as I mentioned before, we are excited to have successfully completed our initial public offering in May, a true team effort involving SiteOne and our many partners. We are very proud to be listed on the New York Stock Exchange and involved with all of our new investor partners.
With that, I will turn over the call to John Guthrie to walk through our financials in detail.