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Operator
Good day, and welcome to the Quest Resource Holding Second Quarter 2021 Earnings Call. Today's conference is being recorded. At this time, I would like to turn the conference over to David Mossberg, Investor Relations. Please go ahead, sir.
David M. Mossberg - Founder and CEO
Thank you, Justin, and thank you, everyone, for joining us on this call. Before we begin, I'd like to remind everyone that this conference call may contain predictions, estimates and other forward-looking statements regarding future events and future performance of Quest. Use of words like anticipate, project, estimate, expect, intend, believe and other similar expressions are intended to identify those forward-looking statements. Such forward-looking statements are based on Quest's current expectations, estimates, projections, beliefs and assumptions and involve certain significant risks and uncertainties.
Actual events or Quest's results could differ materially from those discussed in the forward-looking statements as a result of various factors, which are discussed in greater detail in Quest's filings with the Securities and Exchange Commission. We're cautioned not to place undue reliance on such statements and to consult our SEC filings for additional risks and uncertainties.
Quest's forward-looking statements are presented as of the date made, and we disclaim any duty to update such statements unless required to do so by law. In addition, in this call, we may include industry and market data and other statistical information as follows Quest's observations and views about industry conditions and developments. The data and information are based on Quest's estimates, independent publications, government publications and reports by market research firms and other sources.
Although Quest believes these sources are reliable and the data and other information are accurate, we caution that Quest has not independently verified the reliability of the sources or the accuracy of the information. Certain non-GAAP financial measures will be discussed during this call. These non-GAAP measures are used by management to make strategic decisions, forecast future results and evaluate the company's current performance. Management believes the presentation of these non-GAAP financial measures is useful to investors' understanding and assessment of the company's ongoing core operations and prospects for the future.
Unless it is otherwise stated, it should be assumed that any financials discussed in this call will be on a non-GAAP basis. Full reconciliations of non-GAAP to GAAP financial measures are included in today's earnings release. With that all that said, I'll turn the call over to Ray Hatch, President and Chief Executive Officer.
S. Ray Hatch - President, CEO & Director
Thank you, Dave, and thanks, everyone, for your interest in Quest. We had great momentum coming into the year, and that momentum continued during the second quarter and thus far into the third. The second quarter's financial performance was exceptional across all metrics. Top line growth was 68% relative to last year, which was due to a combination of organic growth, post pandemic recovery and M&A. Organic revenue growth, which excludes M&A, was more than 50% year-over-year. I will point out that strong organic growth performance was not just related to post-pandemic recovery.
To provide another reference point, if we compare second quarter of 2021 to the second quarter of 2019, revenue increased over 30% organically compared to that period. Again, this is organic growth, excluding the acquisitive growth in the comparison. Gross profit dollars grew by more than 55% year-over-year and grew 6% sequentially. The key attributes of our value proposition are clearly resonating with clients and prospects. In turn, they're rewarding us with new business and expanding their scope of services. M&A was also a significant contributor to year-over-year growth with the acquisition of Green Remedies continuing to perform as expected. We also closed on a similar acquisition on June 30, which we expect will contribute to future growth, adding more than $500,000 to our annual EBITDA run rate. During the second quarter, we also showed strong improvement in profitability. EBITDA increased by 120% to $2.5 million. For perspective, EBITDA grew at more than twice the rate of gross profit dollars, which illustrates the earnings leverage and the scalability of our platform.
Before I go into a review of market trends and strategic initiatives, I'm going to turn the call over to Laurie Latham, our Chief Financial Officer, to overview the financials.
Laurie L. Latham - CFO, Senior VP & Secretary
Thank you, Ray, and good afternoon to everyone. Second quarter revenue was $36.9 million, an increase of 68% compared to the second quarter last year. Keep in mind that comparisons are against the peak of the pandemic last year. As Ray mentioned, we showed solid organic growth year-over-year from both new and existing clients as well as the incremental contribution from the acquisition of Green Remedies, which we completed during the fourth quarter of last year. As we discussed last quarter, the heightened activity levels at our industrial clients locations in the first quarter of 2021 continued during the second quarter when compared to the COVID-related constraints last year.
Additional drivers for the increase were split between the incremental contribution from the Green Remedies acquisition, and growth of new and existing clients. Sequentially, revenue increased 6% from the first quarter, primarily from the initial onboarding activity with several new client wins and from the addition of new multifamily housing clients. Also, I will point out that the acquisition we announced in June was completed on June 30, and therefore, was not a contributor to second quarter results.
The second quarter gross profit was $6.8 million, an increase of 56% when compared with the second quarter last year, an increase of 6% sequentially from the first quarter of this year. Gross margin for the second quarter was 18.5% of revenue, which was 140 basis points lower than last year, but within our targeted range. The year-over-year decrease in gross margin was related to the service mix, which will fluctuate from quarter-to-quarter. SG&A expenses were $5.1 million during the second quarter, an increase of $1.1 million compared to the same period last year. More than half of the year-over-year increase was related to the rebound in our business from last year when we took significant cost-cutting initiatives related to COVID. As you might expect, with the recovery of business activity we have increased labor costs, marketing, trade show, travel and other costs related to SG&A. The remaining portion of the increase was related to costs associated with IT project consultants, as well as a timing difference in the accrual for stock-based compensation compared to last year.
Overall, SG&A costs grew at 27% year-over-year which is less than half of the rate of revenue and gross profit dollar growth for the second quarter. We anticipate that SG&A will increase primarily as we add to the national account sales staff and other personnel to support growth. We also plan to increase investment in technology that is expected to enhance operations and add scalability to our platform.
During the second quarter, interest expense increased to $550,000 from $87,000 last year. The increase is primarily related to debt financing for the Green Remedies acquisition. Net income attributable to common stockholders was $0.04 per basic share or $0.03 per diluted share for the second quarter compared to EPS of $0.08 per basic and diluted share for the same period last year.
As a reminder, last year's second quarter included $1.3 million or about $0.08 per share in other income related to the benefit from PPP funds. Adjusted EBITDA increased 120% year-over-year for the second quarter to $2.5 million.
Looking at the cash flow and balance sheet. We generated $1.2 million in operating cash flow during the second quarter and 5.2 million for the first half of 2021. The increase in cash flow was due to the combination of strong net income performance as well as positive working capital changes. About half of the operating cash flow was added to our cash balance, which was $10 million at the end of the quarter, up from $7.5 million at the beginning of the year. In addition, we utilized approximately $2.3 million in cash to finance the acquisition that closed on June 30. The end of the quarter, debt levels were relatively unchanged at $18 million versus $18.5 million at the end of 2020.
So at this time, I'll turn the call back to Ray.
S. Ray Hatch - President, CEO & Director
Thank you, Laurie. Before I get into a review of our strategies, I want to give an update on several of the trends that are positively affecting our business. First, we continue to see post pandemic recovery in all of our end markets. The industrial end market stood out again this quarter and exceeded our expectation, both from existing clients and the earlier-than-expected on-boarding of a major new client in June. All of our other end markets showed modest sequential improvement, which we expect will continue throughout the balance of the year. The second trend that is positively affecting our business is sustainability and sustainability reporting. I believe we are at a tipping point where clients are feeling pressure from multiple stakeholders to divert more late from the landfill. Everyone on this call is aware of the growing demand for public companies to report sustainability metrics. Our capabilities in this area were a clear differentiating factor and why we were chosen for the recent win we discussed last quarter with a publicly traded company in the industrial end market.
This client had previously hired an outside consultant who is ultimately unable to satisfy their needs. We created a data portal for this client with the ability to provide a uniform and audible data set across multiple waste streams for use in sustainability and operational reporting. We have begun onboarding this client recently, and they have given us positive feedback on the visibility that they did not have before. Sustainability is not just important for investors, it's also important for all stakeholders. We've recently created a video for a client in the automotive service market to show their customers, their employees and their other stakeholders. The video highlights in several ways in which Quest is able to help our client recycle or otherwise divert waste from the landfill. I would encourage you to look at the video on our website or on our social media as it's a great example of how we help customers become more sustainable with multiple waste streams.
I won't go into all the details, but in summary, we helped this client recycle 27 million pounds of waste from multiple waste streams last year. That volume prevented 38,000 metric tons of CO2 emissions, which will take all the trees in Central Park 46 years to do the same. I would also note that sustainability achievements we helped this client make are not unique. These types of improvements are widespread amongst our client base.
The final trend I'd like to discuss is how the major vertically integrated waste providers or implementing price increases and how the increasing price of landfill costs are making recycling and our services an increasingly viable solution financially. Let me give you a bit of background. In some cases, the cost of recycling is greater than the disposing of waste and landfill, which has historically been a hurdle for adoption of our services. However, when you take into account the commodity value in some of the waste streams, it can significantly offset costs. Not only do our services help clients maximize the value received from commodities, we also help our clients optimize the efficiency of waste collection, and we have scale that gives us greater buying power with vendors. I would also point out that 1 of our largest profit centers for most -- 1 of the largest profit center for most vertically integrated waste sites -- waste providers is their landfill operations. Since we don't have landfill operations, we're financially aligned to help our clients achieve the most sustainable and cost-efficient method to divert more waste from landfills.
Using these levers, we can often help clients save money by recycling waste streams and diverting waste from the landfill. With increasing prices and increasing pressure to be more sustainable, clients are more willing to have discussions about improving their sustainability, which is lowering the hurdle for the adoption of our services.
Moving on to a review of our strategic growth initiatives. Our multiyear effort in building our sales and client service capabilities is showing ongoing positive results. Our organic growth increased an annual double-digit pace compared to 2019 and of equal importance, the pace of securing and onboarding new clients is accelerating. This success is a reflection of our clients' belief in our ability to add value to the processes, and we appreciate their trust. Based on the recent success of our go-to-market strategy, we are actively increasing the size of our client-facing staff responsible for producing gross profit.
This includes both hunters and farmers in our sales force, client solutions team members as well as vendor management personnel. Overall, even with this incremental investment, we continue to expect 50% of incremental gross profit dollars to flow through to EBITDA.
Let me explain how adding our vendor management to our vendor management team adds to our gross profit growth by lowering our cost of service. Basically, we help our vendors add new business that they would not have been able to compete for individually. This incremental business helps them optimize loads and pick up routes, essentially increasing their utilization and making them more efficient.
The more we help our vendors add revenue and improve profitability, the more value we add for them, which translates into better service for our clients and better economics for all parties involved. In addition to creating greater efficiencies, our vendor management team is also tasked with finding new service providers and adding new types of service. This drives greater client satisfaction and expands our service offering. To drive gross profit dollar growth, we're also increasing the size of our client services team. These folks are tasked with servicing our existing clients as well as adding more locations and service lines to them. There are plenty of opportunities to continue to grow with our existing client base, which has and should continue to provide us with a stable source of growth going forward. The key is to continue to provide exceptional service and our team has a great track record in this regard. We're also adding to a number of national account reps recently hired, and we recently hired an experienced professional to focus on the grocery end market in our newly developed organic waste program, we call Proganics. As we discussed in our last earnings call, grocery chains are increasingly implementing sustainability goals and facing increasing regulation regarding food waste. Proganics' ability to recycle both non-packaged and packaged food in a cost-effective manner is a significant and key differentiator for us. We have our first client in place and are actively educating the market about this program and building a pipeline. We think there's significant opportunity to expand this service and expect it to help us garner new client wins, along with expanding relationships with existing clients.
Next, I'll address our M&A strategy. As I mentioned earlier, we closed on a small acquisition on June 30, which we expect will add more than $500,000 to our EBITDA run rate. This company is in the multifamily housing market and is a nice complement to the acquisition of Green Remedies last year. In addition to this acquisition, we've been very active during the first half of the year, evaluating several acquisition candidates. We expect M&A will continue to be an important part of our growth going forward.
Regarding new business wins in the second quarter. Of note was an expansion with an existing client. The expansion is adding 7 figures to annual revenue and will increase the size of their footprint. I would also note that we had strong organic growth with new clients in the multifamily housing end market during the second quarter. Regarding our outlook, our end markets are strong, and they continue to recover. We continue to view inflation as net neutral to our business as our contracts have mechanisms in place to adjust. Pressure to prove sustainability and increasing cost of landfills are lowering the bar for adoption of our recycling services. The contribution from new client wins will continue to provide incremental growth as we onboard these programs throughout the balance of the year. We have seen increased movement in opportunities through our pipeline and the pace of organic growth is picking up.
As such, we continue to have success adding new clients and are expanding business with existing clients. We are investing in personnel to further grow gross profit dollars. We expect acquisitions to continue to be a significant contributor to our growth. Based on all of these factors in the business that we have in hand, we are optimistic we will continue to deliver strong growth in gross profit for the balance of the year. and we're well positioned to deliver robust organic growth for next year. We expect EBITDA profitability will continue to outpace top line growth as we benefit from greater scale and operating leverage inherent in our business model.
I look forward to keeping you updated on our progress. We would now like the operator to provide instructions on how listeners can queue up for questions. Operator?
Operator
(Operator Instructions) And our first question comes from Gerry Sweeney with ROTH Capital.
Gerard J. Sweeney - MD & Senior Research Analyst
I apologize, I joined a little bit late. So Hopefully, my questions make sense, but meaning not covered earlier. But obviously, you're making a little bit more of a push into the sales aspect. And historically, this has been a little bit of a challenge. I think you went through some iterations. Do you feel as though you have everything in place to start incrementally adding to the sales and the sales force, I guess?
S. Ray Hatch - President, CEO & Director
Yes. Everything is a big word, Gerry. We definitely feel like we've got the right -- we definitely feel like we've made a lot of progress in the area, and I think you're seeing the results in the account acquisition. But we continue to look to complement that effort. So everything now, but we're definitely moving in the right direction. We're excited about where we're headed.
Gerard J. Sweeney - MD & Senior Research Analyst
Got you. And that's fair. I mean we are seeing a nice pickup. And then how much has increased -- I guess, disposal falls at landfills. How much has that changed over maybe the last 2 to 3 years? And how much is that bar load? I know that's sort of a qualitative comment that you made, but I'm just curious if you could expand on that a little bit and just for ratification, I guess.
S. Ray Hatch - President, CEO & Director
Yes. It's hard to put a percentage on it because there's obviously several players in that space, but I don't think a quarter has gone by, Gerry, in the last couple of years, if not more, that there hasn't been price increases going into place. And sometimes the regional, sometimes they're -- actually they're all regional, but they're consistently going forward. I get to see an announcement about landfill cost reduction and don't know that I will. So it's been a cumulative effect, Gerry, and I think it's gained a lot of momentum over the past year. and continue to increase. So just right there, that tells us that our prices are not. So I think that obviously refers to the lower bar we mentioned, but it's been pretty consistent.
Gerard J. Sweeney - MD & Senior Research Analyst
Got you. And then one more question. I think you mentioned you reduced emissions by 38,000 tons of CO2. Are you getting more requests for card data from companies because what we're seeing with a lot of ESG-related companies, with some investors sort of saying, show me how much you're reducing carbon footprint or emissions buy. I'm just curious if you're starting to see this request from your clients for more detail so they can pass along.
S. Ray Hatch - President, CEO & Director
What we've been able to do, for example, what we measure, of course, is that what we measure is the actual materials being diverted and how they're handled. And from that -- from those volume measurements, there's formulas that create those measures. What I was talking about in that earlier piece was really just 1 client. And that 1 client was -- we gave them a marketing tool to use internally for themselves about their sustainability. And that's why we reflected in things like trees in Central Park and stuff like that. And so yes, there's that request specifically was how can they portray themselves in the sustainable way that they operate, how can they communicate that more effectively to their customers. And that's where that tool came from. But yes, Gerry, we get asked quite a bit about, obviously, quite a bit in reporting about the materials and the volume of materials that are diverted from their locations. And from that, we can create those calculations or those illustrations we talked about.
Gerard J. Sweeney - MD & Senior Research Analyst
I can imagine at some point that that becomes an increasing selling tool for you. Just for companies trying to position themselves from an ESG standpoint, some of the moves they've made, is that a fair sort of characterization?
S. Ray Hatch - President, CEO & Director
Yes, I think it's very fair, Gerry. And it's even more than just ESG reporting, like, and that example I gave you. It was -- it's a very environmentally responsible company that wanted to find the best way to illustrate that to their customers to help as opposed to just ESG reporting. But yes, it's becoming more and more prevalent. I think we mentioned 1 of the key reasons we're able to get that industrial win that we started. I know we mentioned last quarter when we started doing business this quarter is because of the visibility that our reporting gets all of that ESG reporting and all those -- it's all about visibility. You can't create that reporting unless you actually see the data, and we collect the data and report it back in a readable fashion. And again, I think I mentioned they had a consultant before that really wasn't able to effectively do that. And with us, they've been able to do that. That's a big piece in getting that business, frankly, I believe.
Gerard J. Sweeney - MD & Senior Research Analyst
Got it. I appreciate it. That's it for me, and I apologize if I got on late.
Operator
Our next question comes from George Melas-Kyriazi with MKH.
George Melas-Kyriazi - President
Congrats on another really good quarter. Very excited to see the organic growth rate. And can you tell us a little bit more about it? I mean -- Is there a way to sort of look at the growth and say how much is coming from Green Remedies. How much is coming from existing clients? And maybe how much is coming from new clients?
S. Ray Hatch - President, CEO & Director
Well, George, I can tell you none of it came from Green Remedies because organic growth in our measurement specifically excludes acquisitions. So.
Laurie L. Latham - CFO, Senior VP & Secretary
Yes, it did. We've had some organic growth with Green Remedies already, it was included, but the acquisition portion that bump, that was totally excluded out of the numbers we gave you.
S. Ray Hatch - President, CEO & Director
Oh, I am sorry. Yes, the acquisition was what the growth we had. And they did have growth. Major players have 3% to 5% increases announced. And our sequential comparison, 6% sequential and that was all organic with no acquisition knowledge. But as far as breaking it out to existing clients and new clients, it really -- We've had new client growth for the first time really significantly in quite a while, and it's really helpful quite a bit of it is.
George Melas-Kyriazi - President
Okay. And do you get -- I mean, based on what you were saying in Gerry's question, it seems like you have quite some momentum in new client acquisitions. Can you help us understand what explains that, what you've done right to be able to achieve that? And are you expecting that to continue?
S. Ray Hatch - President, CEO & Director
Yes. Well, I think what we've done right is we have the right people telling the right message to the right customer. I mean, I know that sounds trite, but it's not as easy as it sounds. These clients that we have in that new account acquisition, they've been -- we've been working with these folks for a long, long time. It's been a long cycle, and it's coming together now. I think all the things we mentioned earlier, George, the tailwinds that we have relative to increasing costs, visibility to sustainable practices. And our ability to execute against their needs is finally starting to pay, I guess, that's the easiest way to put it. But I am very proud of the work that's been done by our internal operations team and our external sales team to identify the needs and to satisfy those needs.
George Melas-Kyriazi - President
And then when you look into your pipeline, your sales pipeline, do you see sort of -- do you see sort of growth continuing in terms of signing up new clients? I mean you have several people in late stages in your new sales pipeline.
S. Ray Hatch - President, CEO & Director
Yes. Yes, we do, George. These folks are the ones that we've got right now, we're sitting late stages for a while as we went through the process, and we've got some in there now. So I definitely expect continued new account additions as we move forward.
Laurie L. Latham - CFO, Senior VP & Secretary
And I think another thing to emphasize is that even the new accounts that have come on, they are the size of accounts that keep growing every month, George. So the size and the complexity, which we talked about a lot is there with a lot of these new clients. So we're seeing the full results of those are going to be continuing throughout the year. And then when we see some of these new accounts that we're just bringing on, when we annualize that next year, that will be another big contributor to next year's organic growth also. So it's once you land that -- those nice big accounts they just continue to drive our growth for several months as we roll out and continue to optimize them.
S. Ray Hatch - President, CEO & Director
Does that help, George?
Operator
It actually did. He actually did just leave the question-and-answer queue. (Operator Instructions) And our next question will come from Greg Kitt with Pinnacle Fund.
Greg Kitt
Congratulations on the great quarter. Thank you for your hard work. I was really encouraged to hear that you're continuing to benefit from this economic reflation, but you were also -- that you also had an opportunity to grow even if economic growth slows as you expand the number of waste streams that you're managing for your existing customers and continue to add new customers. As you look at the opportunity with your existing customers, do you think there could be an opportunity to add $50 million of revenue over the next 5 years? Or is there a way to think about what that opportunity is with your existing relationships?
S. Ray Hatch - President, CEO & Director
That's probably pretty hard to quantify, Greg, at this point in time. I think our existing clients have been responsible for the majority of our move north and gross profit dollars over the last several years. I expect the pace to continue kind of to what we've been doing in the last couple of years with these guys look at the GP dollar growth. And now you can add in these new accounts and the ramping that Laurie just referred to on top of it.
Greg Kitt
I was wondering if you can help me understand when you think we could start to see results from some hires on the client services team and national sales/new account-focused reps.
S. Ray Hatch - President, CEO & Director
Well, I think we're already seeing some results from the national -- excuse me, the client solutions services team because they're managing some of this onboarding and helping expand some of the growth that we have going on right now, the organic growth you've seen, and you'll continue to see that in organic growth. That's how you'll see the results. So I think we're seeing it today. The expanded sales force is already -- Our pipeline has got some great stuff from them and there, Greg, and we should be seeing some new stuff from them quite shortly, hopefully get those executed. And we have already started to implement expansions in the client -- or excuse me, in the vendor relations side, that we mentioned last quarter, and that's helping us a lot in supporting these new customers and onboarding with better services from client services and expanded service lines as well.
Greg Kitt
One more for me, if I may. I think one of the reasons that it sounds like you're winning new customers is because you have a solution and you're solving a need that the customer needs. It's not just, "hey, we can ..." -- it's not just a bake off based on price, you're providing services that are helping meet the customers' need and you're providing all the data and reporting for that customer. Maybe you could help me understand, is that accurate? And what do you think is resonating so much with customers that you're winning large new customers at a rate that I don't think you've won the mat in the past couple of years?
S. Ray Hatch - President, CEO & Director
No, you're absolutely right. The rate -- we're bringing on new business right now. I couldn't be more pleased with the change from the past couple of years. In the past couple of years, our GP dollar growth was we were entirely focused on our existing client base and driving efficiencies, improved cost of service, and that's where you're seeing that. These new clients coming on board, I really do believe that some of the tailwinds we've been talking about for a long time, whether it's the ability to divert from landfill and track that ability to divert from landfill the value -- optimizing the value of the commodities they are producing, which we've done a great job the team has. I think in many cases, the simple solutions they've been offered before are underserving their current need. I really think as an overarching view, Greg, we can bring a whole myriad of solutions to these larger clients. And these ones we're talking about, these are fairly significant new clients. And our diversity both in geographic and the variety of services. And the fact of the matter is every company out there is struggling a way, whether it's with labor, whatever the strange economic time. So if we can create a situation where they have 1 less thing to worry about, I think it makes us much more attractive. And I think all of those things have gone into and probably more that I didn't describe have gone into this recent change. And I'm happy to see it, and I expect it to continue.
Greg Kitt
And one last comment and maybe just to clarify my understanding. Even with some of these investments that you're planning to make to prepare the company to scale and serve some of these larger customers, you still expect 50% of incremental gross profit dollars to fall through to EBITDA. So if you added $5 million of gross profit that could be $2.5 million of EBITDA approximately. Is that right?
S. Ray Hatch - President, CEO & Director
Yes. No, that's the formula, and we feel really good about it. The business model and it's yielding it today. It has consistently and we expect it to get -- to continue to.
Greg Kitt
Awesome. We're so excited, and we can't wait to see what you do over the next couple of years.
S. Ray Hatch - President, CEO & Director
Thank you, Greg. We appreciate it.
Laurie L. Latham - CFO, Senior VP & Secretary
Thank you.
Operator
And that does conclude the question-and-answer session. I'll now turn the conference back over to you for any additional or closing remarks.
S. Ray Hatch - President, CEO & Director
Thank you, operator. I just want to, again, thank everybody for their continued interest in Quest and following us, and I want to take this moment to thank the Quest team for yet another consecutive hard-working productive quarter. These folks have been working very hard, and we appreciate that, and it's starting to show really in the results. And so thanks to everybody. That's all I have, operator.
Operator
Well, thank you. And that does conclude today's conference. We do thank you for your participation. Have an excellent day.