Greetings, welcome to Grocery Outlet's fiscal second quarter 2020 earnings results conference call. At this time, all participants are in listen only mode. A question and answer session will follow the formal presentation. If anyone should require operator assistance during the conference, please press star zero on your telephone keypad. As a reminder, this conference is being recorded. It is now my pleasure to introduce your host, Joseph Pelland, Vice President of Investor Relations. Thank you. You may begin.
Thank you. Good afternoon, everyone, and thank you for joining us on today's call to discuss Grocery Outlet's second quarter financial results. Participants on this call will make forward-looking statements, which are subject to various risks and uncertainties that could cause our actual results to differ materially from these statements. Any such items, including our outlook for fiscal 2020 and future performance, should be considered forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. A description of these factors can be found in this afternoon's press release, as well as in our latest prospectus and periodic reports we file with the SEC, all of which may be found on our website at investors.groceryoutlet.com or on sec.gov. We undertake no obligation to revise or update any forward-looking statements or information. During our call, we may reference certain non-GAAP financial information, including adjusted items.
Reconciliations of GAAP to non-GAAP measures, as well as the description, limitations, and rationale for using each measure may be found in the supplemental financial tables included in this afternoon's press release, in our SEC filings, and the Investors tab of our website. We reference non-GAAP measures in some of our financial discussions, as we believe they more accurately represent the true operational performance and underlying results of our business. Presenting on today's call will be Grocery Outlet's Chief Executive Officer, Eric Lindberg, President, R.J. Sheedy, and Chief Financial Officer, Charles Bracher. Following our prepared remarks, we will open the call for questions. With that, I'll turn it over to Eric.
Thanks, Joe. Good afternoon, everyone. I hope you and your families remain safe and well. Approximately one year ago today, we conducted our first earnings call as a public company. We are very pleased to have delivered strong and consistent financial performance since our IPO. We're equally proud of our ability to navigate the unprecedented challenges and opportunities presented by COVID-19 in recent months. I'm also extremely proud of our hard work, dedication, community support that has been demonstrated across our organization. This includes our IOs and their store associates, who have worked tirelessly on the front lines to serve our customers and our communities, our distribution center teams who went above and beyond to help us keep product flowing, our purchasing teams who leveraged our strong relationships to source both opportunistic and everyday products, enabling us to deliver great value to our customers.
I'm so grateful for all their commitment. Looking at our second quarter results, our performance reflects the strong execution across our organization. Revenue growth of 24.5% was driven by a 16.7% increase in comparable store sales and sales from 32 new store openings since June of last year. Adjusted EBITDA grew 34.7%, reflecting gross margin expansion, slightly offset by modest SG&A deleverage due to higher costs related to protecting our employees and our customers during COVID-19. As we move forward, we will continue to reinvest productivity savings and leverage our flexible business model to drive long-term growth. Consistent with that philosophy, we are accelerating our investments in people and capabilities across three areas. First, advancing how we buy as we further develop our infrastructure to drive a wider gap in our leadership position in secondary market.
Second, advancing how we sell by improving our ability to attract the very best operator candidates and prepare them for success, and by making our extraordinary network of IOs even better. Third, continuing to scale our business to support 10% annual unit growth. R.J. will speak in a moment about the first area of reinvestment, how we buy. My discussion today will begin with the second area, how we sell, which is centered all around our IOs. We continue to expand our network of field-based educators to more effectively support our existing IOs, as well as train and develop our newer operators. In terms of recruiting our new operators to the system, we are utilizing our digital marketing capabilities to more effectively target and recruit new operator candidates.
While early, we are pleased to see the quality and the strength of incoming inquiries we've received from both those with traditional retail experience, as well as other relevant backgrounds such as hospitality and food service. As we look for new operators, we know that candidates must have both the right mindset and the right skill set to succeed as IOs. We aggressively search and screen for entrepreneurs who are smart, independent, hungry, and humble. While we love to find candidates with existing grocery management experience, equally important to us are vital skills such as customer service, labor management, marketing, and leadership. Once identified, these candidates go through an intensive training program, part of which is an in-store immersion experience with a seasoned operator.
In order to make our training program more consistent, scalable, and efficient, we are evolving our training approach to leverage the best of our operator, field, and corporate teams to create a virtual learning environment. We believe the consistency and rigor provided by virtual training workshops and simulations will be an effective supplement to the in-store training environment. We expect this hybrid approach will help improve the readiness and effectiveness of new operators when they begin managing their new store. We also believe that it'll provide a more consistent and scalable training experience as we continue to grow our store base. Training doesn't stop once the IO first opens their store. Our operators are aggressive and hungry entrepreneurs who are always looking to develop their skills and grow their businesses.
To support that, we provide operational and analytical resources through our field management teams, corporate staff, as well as various data and business intelligence tools. To build upon this support, we're developing new educational content designed to help them further grow and develop their skills. For example, sharing of best practices has always played a very important role in our culture, and the emphasis on virtual learning will make it easier for subject matter experts to work with operators across all geographies and easily share video content. As our business grows, we will continue to leverage scalable technologies to enhance our ability to support operators. Turning now to new store growth, our retail expansion strategy remains a significant investment priority. We opened seven new stores in the second quarter and now expect to open 30 to 32 new stores for the year.
We remain pleased with the performance of our new stores, which like our broader store base, are benefiting from the elevated customer demand. Looking forward, we remain excited about the availability of attractive real estate sites as we continue to build our store pipeline to support 10% annual growth. In summary, the strong financial results we delivered in the first half of 2020 set us up to accelerate investments in our business to support our long-term growth objectives. We look forward to updating you on that progress. Before I turn over the call to R.J., I want to discuss a topic of great importance to us. As we've shared with you in the past, our mission of touching lives for the better is deeply rooted in the foundation of Grocery Outlet.
As part of this, each July for the last 10 years, we have run our Independence from Hunger campaign to address critical food insecurity needs across our communities. We are excited to share this was a record-breaking year for us, with $3 million raised across our network. Grocery Outlet also donated an additional $1 million, bringing the total raised to $4 million. This brings our total money raised and donated to local communities since the campaign's inception 10 years ago to over $11 million. As proud as we are of this accomplishment, recent events have pushed us, as well as many other organizations, to ask ourselves whether there's more that we can be doing to address inequality across our society. Specifically, how can we be more effectively supporting diversity, equity, and inclusion?
While we've always served diverse communities and fostered an inclusive workplace, we know that there's more we can do and there's more we will do. We have spent considerable time internally discussing steps we can take to improve going forward, and our efforts will span across our employee base, network of IOs, and other partners. That includes an assessment of our diversity performance and establishing scorecards and measurable goals for the future. We are also gathering information through surveys and rolling out listening sessions to gain a deeper understanding of our team's perspectives. Lastly, we're providing education modules and resource guidelines to increase awareness and sensitivity across our corporate teams as well as our IOs. With that, I'll turn it over to R.J.
Thanks, Eric. Good afternoon, everyone. We remain incredibly thankful to our independent operators, our buying and distribution teams, and our valued partners for their outstanding efforts and dedication in helping us to support communities since the start of this pandemic. Our combination of extreme value, unexpected deals, localized assortment, and friendly service resonates with customers now more than ever. Over the last several months, we have leaned on our flexible operations to adapt quickly to industry changes. Our inventory management capabilities and supply chain execution enabled us to consistently meet increased consumer demand throughout this period. Our inventory levels remain healthy, depth of value remains strong, and we continue to offer an exciting treasure hunt of wow deals for customers shopping our stores. Our execution in the first half of this year was made stronger by prior investments made in strategic business initiatives.
For example, consistent reinvestments in purchasing through people, process, and systems have enabled us to further strengthen our leadership position in the secondary market and scale our business for growth. These investments help deepen relationships and improve partnerships with existing suppliers. They also help to support new and better ways of pursuing partnerships with both traditional and non-traditional suppliers. We've talked before about greater specialization in our buying organization. Opportunistic supply remains plentiful, and our specialized approach is helping us capture even more of this product. Our buying team continues to develop and strengthen supplier partnerships, ranging from our largest strategic suppliers down to smaller, high-growth companies. We also continue to deploy new strategies to identify, establish, and develop relationships with new suppliers. Our relationships with many of our largest suppliers go back decades, and we consider them to be an extension of the GO family.
These partnerships are strategic, which means they are broad, long-term relationships that reach well beyond any individual opportunistic deal. Our buyers use a personalized, high-touch approach to engage with each supplier. We interact with each of them at senior levels and communicate regularly to identify a wide range of mutually beneficial opportunities. Excess packaging, innovation planning, and reconditioning opportunities are just a few examples of ways we partner with major suppliers. We also look at the total business, both opportunistic and everyday, and manage to shared sales and profit goals. We are equally excited about our potential with smaller, high-growth suppliers. These are a combination of suppliers in high-growth categories and those that are on a strong growth trajectory due to their own brand and product positioning. Our objective is to be a valuable solution provider for these partners, as well as to help them grow.
In some cases, our partnership helps them scale their business by reducing manufacturing costs. In other instances, we help them by driving new customer trial, which increases brand awareness and loyalty. We provide an easy go-to-market retail option for them to grow their business. As with our strategic suppliers, we follow a customized approach and partner with them on long-term, mutually beneficial strategies. We also continue to invest more time and resources in establishing and developing new opportunistic relationships. We are further increasing buyer specialization with a focus on new supplier acquisition. This positions us well to efficiently identify and develop new relationships with suppliers of all sizes. In many cases, new partnerships begin with a smaller initial purchase order. Many initial purchases represent an opportunity to develop new, high-growth, long-lasting supplier partnerships, and we work to nurture these relationships with this in mind.
Disruption from the pandemic continues to present a number of these new supplier opportunities, including non-traditional suppliers, similar to what we shared last quarter. In addition to investments in opportunistic buying, we are also enhancing our approach to everyday items and category management. This is a combined effort between buying, inventory management, and our strategy teams. Benefits here include more relevant items, higher sales productivity, and better seasonal planning. One recent example is improvements made to our relatively new seafood category. We optimized and focused our assortment according to customer demand, which drove higher sales and margin while also streamlining store ordering and execution. Extreme value on quality branded products resonates with customers now more than ever. We continue to see strong engagement from existing customers and a healthy flow of new customers shopping Grocery Outlet.
These new customers represent a mix of different shopping behaviors and patterns, consistent with our overall customer base. We are the primary store for some and secondary or tertiary stores with others. We continue to target bargain-minded customers with value. This approach has served us well and offers ample opportunity for growth. Our marketing strategies are focused on attracting new customers, as well as staying top of mind to drive repeat visits with those that already shop us. We continue to evolve our media mix and messaging to capture the attention of our target customer. Our shift from print to digital provides the flexibility to communicate real-time, store-specific information on our ever-changing wow deals. It also helps us address more recent changes in customer behavior and communication preferences. Another initiative within marketing is personalization. Investments made in our email database have enabled the launch of our welcome series email campaign.
Customers that sign up to receive emails now receive a welcome message, followed by a customized program of additional emails and videos that serve as an introduction and education on the unique attributes of Grocery Outlet. We supplement this brand marketing with regular WOW alerts that communicate the best deals currently available. This is just one part of communicating the wow beyond the four walls of the store. Customers have responded very well to this outreach, and we plan to further increase engagement as we advance our personalization strategies. In conclusion, we are extremely pleased with our progress and confident that the investments we continue to make in talent, infrastructure, and operational enhancements will further advance our strategic growth initiatives. I will now turn the call over to Charles.
Thanks, R.J. Good afternoon, everyone. Our second quarter results reflect the strength of our business model and the outstanding efforts by our team and our Independent Operators as we continue to operate through this pandemic. Sales for the second quarter increased 24.5% to $803.4 million compared with the same period last year. This growth was driven by a 16.7% increase in comparable store sales, as well as the sales contribution from 32 net additional stores since the end of the second quarter last year. Our comp growth in the quarter was a result of an increase in average transaction size, partially offset by a decline in traffic. Comp performance was once again broad-based, with strength across all regions and vintages. We opened seven new stores in the quarter, ending with 362 locations.
We remain pleased with the performance of our newer stores, which, consistent with our established stores, are benefiting from elevated food at home spending. Second quarter gross profit increased 27.7% from prior year to $253.8 million. Its gross margin performance exceeded our expectations going into the quarter. Our gross margin rate was exceptionally strong, increasing approximately 80 basis points from prior year to 31.6%, largely due to reduced markdowns and throwaways as a result of faster inventory turnover. This improvement in inventory efficiency more than offset distribution cost deleverage resulting from enhanced safety measures and higher personnel expense at our warehouses related to COVID-19. SG&A expense grew 25.6% to $198 million, with the increase largely attributable to higher variable commissions to independent operators resulting from gross margin dollar growth, higher store occupancy due to unit expansion, and continued personnel and infrastructure investments to support the growth of our business.
In addition, we incurred incremental COVID-19 related store and corporate costs, as well as public company costs and transaction expenses related to our April secondary offering. These factors resulted in SG&A increase as a percentage of sales to 24.6% from 24.4% in the same period last year. Stock-based compensation expense for the second quarter was $10.2 million, largely driven by the full vesting of 2014 performance-based stock options in conjunction with our April secondary offering. As a result of the tax benefit associated with employee option exercises during the second quarter, we incurred a $2.2 million tax benefit, resulting in an effective tax rate of -8.3%. Relative to our normalized tax rate, this option related tax benefit increased net income by $9.6 million in the quarter, or $0.10 per diluted share.
As a result, GAAP net income for the quarter increased to $29.3 million or $0.30 per diluted share, compared to a net loss of $10.6 million or $0.15 per diluted share in the prior year. For the quarter, adjusted EBITDA grew 34.7% to $60.6 million from $45 million last year. Adjusted net income increased 189% to $41.8 million or $0.42 per diluted share based on an average of 98.6 million diluted shares in the quarter. Turning to our balance sheet and liquidity, due to the sustained momentum in our business and our strong cash flow generation, we elected to repay our $90 million revolver draw in late May. As a result, we ended the second quarter with $79.8 million in cash. As R.J. mentioned, we remain pleased with the quantity and composition of our inventory, which increased 13.1% versus the prior year to $229.3 million.
Total debt decreased from the first quarter to $460.1 million as a result of our revolver pay down. While we remain confident in our liquidity position, we continue to take the conservative approach of building cash on the balance sheet, given COVID-19 related uncertainty. For the quarter, we generated $22.2 million in operating cash flow as our strong operating performance more than offset our rebuild in inventory from our March low point. We invested $21.8 million in CapEx in the second quarter as we continued to build new stores and invest back into the existing fleet. Turning to current trends and our outlook for the back half of the year. Comp sales growth stands at 10% for the third quarter to date. We continue to see growth in basket size partially offset by lower traffic as customers continue to consolidate their trips.
We anticipate that our comp growth will continue to moderate as the economy reopens. With respect to gross margin, we expect that our margin rate in the back half will be roughly in line with prior year quarterly results. That expectation is driven by a moderating shrink benefit as inventory turnover normalizes, margin headwinds from commodity cost increases, and the fourth quarter margin dip we typically experience as a result of holiday product mix. With respect to expenses, we continue to prioritize making the right health and safety investments on behalf of our employees, customers, and Independent Operators. As such, we expect to continue to incur incremental costs in the back half of the year associated with COVID-19, such as cleaning and safety costs for protective equipment and supplies, and higher personnel expense.
While the pandemic has been challenging to navigate, it has provided a unique opportunity to bolster talent and infrastructure as we continue to execute against our long-term growth objectives. As such, we have increased investments in people, process, and tools to better position us to capitalize on the significant white space in front of us. Those accelerated investments began in the second quarter but will ramp more meaningfully in the third and fourth quarters. The same can be said for public company costs, which we believe will continue to build as we become fully SOX compliant. Taking all of those sales, margin, and expense expectations into account, we believe adjusted EBITDA margins for the second half of 2020 will be modestly below prior year levels.
In terms of other items on the P&L, with respect to stock-based compensation, we have now incurred substantially all of the expense associated with our time-based and performance-based 2014 employee options. In the second quarter, we implemented a new long-term incentive plan to attract and retain talent. At target levels of achievement, we expect that the stock-based comp expense associated with this new plan will ramp over three years to an annualized run rate of approximately $25 million. Following the repayment of our revolver, we expect interest expense to be roughly $6 million on a quarterly basis. We continue to expect a normalized tax rate of approximately 28%, which excludes discrete items.
We expect weighted average diluted share count for the year to be approximately 100 million shares. Based on our current projection of 30 to 32 new store openings in 2020, we now expect that CapEx for the year will be in the range of $95 million-$105 million. We do not expect any store closures in 2020 beyond the two we had in the first quarter. In closing, we are incredibly proud of the performance of our team and IOs, and the exceptional results we delivered in the first half of 2020. Despite the continued uncertainty surrounding COVID, we remain as excited as ever about our unique positioning in the marketplace and our long runway for growth. We remain committed to managing the business for the long term and making smart investments in pursuit of those objectives.
With that, we can turn it back to the operator to begin Q&A.
Thank you. Ladies and gentlemen at this time, we will be conducting a question and answer session. If you'd like to ask a question, you may press star one on your telephone keypad. A confirmation tone will indicate your line is in the question queue. You may press star two if you would like to remove your question from the queue. For participants using speaker equipment, it may be necessary to pick up your handset before pressing the star key. Our first question comes from the line of Paul Trussell with Deutsche Bank. Please proceed with your question.
Yes, good afternoon, and congrats on another good quarter. To start, maybe we could touch on the availability of goods as well as the performance, kind of breaking down between everyday items as well as opportunistic items.
Hi, Paul. It's R.J. I can take that one or those two questions. I'll start with availability of opportunistic supply. We continue to see ample supply from our partners, as mentioned in our comments. We're pleased with the health of the inventory and the overall assortment. I'd point to the great work done by our buying and inventory management teams in maintaining the inventory levels that we have. We're in a unique situation for sure, we've been at this business for a long time, and we've been through lots of different cycles. I'd say we keep in very close contact with all of our suppliers. We understand supplier dynamics very well, whether it's changes to assortments being made or innovation or where product may still be on allocation.
I'd point to our success right now as being the result of the same methods and approach that really we've followed over many, many years. We haven't changed the way that we conduct business even in this unique situation. We continue to benefit from doing business with lots of different suppliers. We've pointed to the diversified supplier base as a strength on previous calls. Supply does cycle by item and supplier, and so to be able to balance that across many supplier partnerships helps at all times. Important to remember here that this just contributes to the treasure hunt experience in the stores and that customers are used to changes in items and they get excited by new and different items showing up with great value on a regular basis. I always come back to the partnerships we have with suppliers, strong, long-lasting partnerships.
We're a solutions provider to them. We partner strategically on long-term goals. We follow a customized approach. We work creatively. All of these things, they're long-term in nature, so they help during any short-term fluctuations that we see. That, again, has been true throughout our history. I'd also point to focus on new supplier acquisition as a real strength. In pre-COVID times with the amount of change in the supplier landscape, but certainly now as it's benefited us both with traditional and non-traditional suppliers. We've mentioned previously on the non-traditional side, continue to see opportunities from food service, hospitality, more recently cruises and hotels and fitness centers and other opportunities that have come our way. Maybe the last point I'll make on opportunistic supply, I continue to be bullish on a long-term opportunity here. Manufacturers have increased production.
They don't want to get caught again, like what happened back in March and April. I'll say we've already seen some opportunities that have come our way from overproduction. We expect more to come in the future. We continue to benefit from retail closures and slower reopenings. That time will tell how quickly others open, but we've been able to help out some suppliers in tight situations there. Anytime there are changes in assortments, whether it's SKU related or category related, packaging related, we see those opportunities. Ultimately, any type of supply chain imbalance is a positive thing for us. All of those things will continue to be true as we look forward. Just as quickly in terms of mix, I think your question was, have we seen any material change in mix?
What I'd say here is we don't manage our business to mix. We manage to value, and mix continues just to be the result of where demand is, what we're able to purchase, and ultimately where we can deliver value. As a reminder, customers don't know the difference between everyday and opportunistic. That's all internal speak. They do recognize value. We continue to orient around that. That said, everyday has tracked a bit higher in terms of mix as some of the higher demand items and categories do skew more to the everyday side. That's bumped that up a little bit. We're used to short-term changes in mix as demand and supply fluctuate. You always come back to our flexible buying and merchandising model that allows us to adjust, and that we don't have set SKUs or hierarchy or any volume commitments there.
Perfectly comfortable managing these fluctuations in mix and always maintaining healthy value to drive both sales and margin.
That's really helpful color. Thank you. Just as a follow-up, is there any metrics or color you can share on what you're seeing from a new customer count standpoint or just overall brand awareness? While food at home is obviously benefiting all stores, Charles, is there a way that you strip that out and gauge new store productivity that you can speak to? Thank you.
Yes. Paul, I'll take the first part. Then Charles can pick up on the second. I'd say in regards to new customers, we're pleased with the number of new customers that continue to come into our stores. New customer levels are tracking at very healthy levels, particularly in our developing markets, specifically Los Angeles and Pennsylvania, so seeing really nice new customer count growth there. In terms of metrics, we conduct regular surveys. I would say, we look at profile of the customer, we look at shopping behaviors, we look at satisfaction with Grocery Outlet. I'd say a couple things. One, new customers are a mix of those that shop as his primary, secondary, and tertiary. Very consistent with what we've seen in the past and consistent with the overall mix. They're having a great experience, so satisfaction is high.
They're very satisfied with the store experience, and we believe there's incredible stickiness to that experience and we're seeing it in the metrics from our survey. The treasure hunt resonates with them, the value, the convenience of a small shop, the operator, the connection to community. Health and safety, of course, is critically important to customers now, and they're satisfied with the things that our operators are doing around health and safety and cleaning. They're coming in, and they're having a good experience, and we think that bodes well for us looking forward. Charles?
Paul, just to add to R.J.'s comments on new store productivity, we're really pleased to see performance in new stores. The rising tide is lifting all boats. We've seen new stores open this year as well as the ramped vintages for the past several years continue to benefit. Importantly, as R.J. mentioned, a big part of that is new customer acquisition. Feel really good about where we are. It's an important metric for us and one that we track very closely.
Our next question comes from the line of Randy Konik with Jefferies. Please proceed with your question.
Hey, guys. How are you? Can you hear me?
Yep, we can.
Yeah.
Oh, yeah. Sorry. I guess my first one, maybe back to R.J. to kind of a follow-up on the first question there. Can you give us a little bit more background? You talked about expanding the supplier base during the pandemic, cruise lines, hotels, et cetera. Could you maybe frame out a little bit more quantitatively just how the supplier base has grown, maybe in the past six months, past five years, and past 10 years? Just the reason I'm asking is, during the Great Recession, we saw TJX have a similar thing happen to them where their supplier base exploded during the Great Recession, and it kind of led to a really expansive partnership network. Then the other thing that happened with that particular company was the nature of the relationship or the dynamic of that relationship with those suppliers also changed.
When I'm hearing your comments with the script with the call, it sounds like the dynamic of the relationship with these suppliers is deepening even further, meaning you're getting even more preferential treatment, seeing Grocery Outlet as a preferred partner, getting maybe some made-for product or something beyond just opportunistic closeout kind of stuff. Maybe just give us some perspective on quantifying that supplier base and then kind of giving us a little bit more meat around the dynamic of the relationship with the supplier base and how that's been changing over the past three months and the past few years.
Thanks for the question, Randy. A lot of what you just said there is true in what we've experienced over the years. Certainly, growth in terms of number of suppliers, we've expanded our supplier base as the assortment has evolved. You think about categories, and we talk a lot about NOSH, but I'd point to Natural, Organic, Specialty, Healthy is seeing tremendous growth and the establishment of new supplier partnerships. That's in part because of how we've evolved the assortment and, of course, what's happening within the supplier landscape with new upstart suppliers and higher growth suppliers coming into the industry, and we've been able to establish those relationships and grow with them. To your comment about the types of relationships, and how that's evolved, we talk a lot about strategic partnerships.
In the comments there, what that means to us is it is much more than a transactional type of relationship. It's much more than an individual opportunistic deal. We partner with them together for the long term. We treat the relationship accordingly. You think about things like creative solutions to instances where they're stuck. Certainly, as we think about cost and margin and value in that equation, it's over a longer period of time. I'd say we've evolved into more of a hybrid, opportunistic, and everyday mix with many of our larger suppliers, and that's proven to be mutually beneficial. We're a high growth channel for them, and we continue to access more and more of their opportunistic. Specialization within our team is a part of managing these relationships better. We think about strategic suppliers and an approach that works well there.
We think about smaller, high growth suppliers and tailoring our approach needed there. This continued focus on new supplier acquisition and development is something that allows us to be more focused. We do believe that we are a preferred partner. We ask suppliers all the time what more we can do to be a better partner, and we've gotten better as a result. We have that type of relationship and communication. For us, it's about finding new and helpful ways to partner with them. We're constantly working with our points of contact, broadening our reach throughout the organization and exploring opportunities to help them, whether it's specific to innovation or supply chain situations that they're in, or on the smaller side, helping them scale to grow.
All of these approaches, I'd say, have been part of a longer term evolution as the company's grown, as we've invested in people and systems to be able to do things better. I think both we and our supplier partners have benefited as a result. Just lastly, I think on your question related to non-traditional suppliers, we think of those no different than any other new supplier partnership, and that we want to cultivate that relationship and grow with them. It has been a smaller part of the mix in terms of PO volume or sales volume, but as with most new supplier partnerships, it starts with an initial PO and then develops into longer, bigger partnerships from there. We expect many of those opportunities to play out the same way on the non-traditional side.
Very helpful. I guess real quick follow-up, just maybe give us a progress report on younger market progress, let's say like Pennsylvania or Southern California, and how that compares to mature market performance, just so we get a flavor for how the younger markets and the East Coast are doing relative to the historical markets. Thanks. Thanks, guys.
Hey, Randy, it's Eric. Good to talk to you. You know we've said it before that the East business is still a very young business. Super excited to have Heather back there. She started really in earnest in February. I'd say great progress this year in terms of comps and sort of her leadership in the market and sort of getting us set up for growth. Transfer out to Southern California. That market's done really, really well. We really started opening stores there sort of 2014, 2015. It's taken us a while to get up to what I think is going to be around 85-90 store count by the end of this year. Our market shares are still fairly small. We're doing really well down there. I think the brand is growing.
We've concentrated a lot on supply chain the last few years and making sure we're buying product, putting it in L.A., and distributing from there. We've also focused our recruiting locally for placement locally. Everything's sort of clicking together. Obviously, as we build that market share and build that position, things will continue to get even better. We're really pleased with both of them.
Super helpful. Thanks, guys. Really appreciate it.
Our next question comes from the line of Robbie Ohmes with Bank of America. Please proceed with your question.
Oh, hey, guys. Great quarter. Thanks for taking my question. Actually, just two quick questions. The first was just on the sequential slowdown to the 10% comps. Any color on whether the slowdown is more traffic or ticket driven? Sort of maybe just more color on the slowdown. Maybe are there any category things, any category slowing sequentially more than others? My other question is just on the incremental COVID-19 costs. Can you remind me what the IO cost structure is, in terms of how much of the COVID-19, are you guys helping them with the store level COVID-19 costs, or are your incremental costs all your side of the business? Thanks.
Hey, Robbie, it's Charles. Let me tackle both of those. First, with respect to the comp flow, I would say, the enduring trend that we're seeing is that safety is really top of mind for customers. Beginning the second quarter and continuing now, they continue to consolidate their trips into the store. The overall traffic trend has been steady, and I think that's true across our markets. It's really been the average basket size that while it remains elevated, that is starting to moderate as the economy is slowly reopening. Really hard to say how traffic and basket are going to trend as we move into the fall and winter. I think broadly speaking, this trend of overall moderating comps is one that we would expect as markets continue to reopen. That's comp flow. Secondly, your question on COVID costs.
We are absorbing some costs and helping support the operators in costs that would normally fall onto their P&L. Things like supply costs in the store for personal protective equipment and safety related costs, cleaning costs. Per the letter of the operator agreement, it wouldn't be a cost of ours, but we think it's the right thing to do. We've absorbed those costs in the second quarter, and we would anticipate continuing to absorb those costs as we move through the balance of the year here. That's great. That makes a lot of sense and really helpful. Thanks, guys.
Our next question comes from the line of Michael Lasser with UBS. Please proceed with your question.
Good afternoon. Thanks a lot for taking my question. If you look at the customer base by shopping behavior, so the full shops versus those who are just doing a fill-in, which I think you had some nomenclature on how you referred to those different buckets earlier in the call. How are those two baskets doing quarter to date versus where they were doing in the first two quarters of the year? My question is basically, are you seeing a slowdown in those fill-in shoppers, or is the slowdown occurring more in those who are doing their main shop at Grocery Outlet?
Hi, Michael. I'd say, across different shopping behaviors or groups, if you will, we talk about primary, secondary, tertiary. We've seen consistent trends, so no particular trend specific to one versus the other.
For those customers who you've been able to attract new into the fold, have you been able to trade them up from being tertiary or secondary into a primary shopper? How do you do that?
As I said, they've been a healthy mix. They're newer, there isn't a ton of history there for movement, if you will. Beyond that, we don't necessarily think of all tertiaries as potential for secondary or secondary to primary all the way up. Customers shop us in different ways. They fit us into shopping patterns specific to their needs and how that works for them. Yeah, certainly to the extent that they have the propensity to become primary as we continue to offer great value and a great shopping experience, they'll move there. We don't really think of our business so much in that way in terms of customer migration as you've described it, just given the unique nature of our store and how we appeal to different customers in different ways.
Okay. Thank you very much, and good luck.
Thank you.
Our next question comes from the line of Oliver Chen with Cowen. Please proceed with your question.
Hi, thank you. Inventory management was tightly managed this quarter. As we look ahead, should we expect inventory growth to underpace sales growth in the back half as well? Do you expect that trend to continue? Also, your comments on buyer specialization, why was now the right time for that to happen, and what do you see happening in terms of timing of impact of that decision?
Hey, Oliver, this is Charles. Let me take the first part, and then I'll send it over to R.J. With respect to inventory, yeah, really pleased with the current composition and level of inventory that we have. Of course, you saw a nice rebuild from the end of the first quarter. As we look towards the back half of the year, yeah, I would think in general, it's going to trend roughly in line with sales growth. Of course, given the nature of our business and the opportunistic purchasing, it can fluctuate a bit more than traditional retail. I think that general rule of thumb of in line with sales growth is pretty safe. In regards to specialization, we've been talking about that for a number of years. I'd say the first piece was when we introduced inventory management back in 2013.
Those were tasks handled by the buying team previously. The first piece there, and then more recently, really two years ago, started the planning and moving people into everyday and opportunistic. Really just a reflection of being able to better manage the business, recognizing that opportunistic and everyday are unique parts to buying. With the change, we've been able to go deeper. On the everyday side, still growing into better category management, and everything involved with that. On the opportunistic side, it's been hugely beneficial to have 100% focus from that team as we think about these different tiers and types of suppliers as well as new supplier acquisition.
Thank you. As you do look ahead of curbside pickup and delivery, what are your thoughts about how that may be a factor in your future and what your customers want, and how the specialness of the treasure hunt may or may not relate to those digital options?
Yeah. Our long-term position on e-commerce hasn't changed. We have a long runway for growth through both our existing stores as well as new store growth. Ultimately, our customers enjoy the in-store WOW shopping experience, the treasure hunt, the value, the personal engagement. Still hard to replicate online, and we don't want to sacrifice value for that. We'll continue to evaluate e-commerce relative to other long-term priorities. In the meantime, we continue to do a lot by way of digital marketing, things like personalization and social media and growth of the email database. All of those things have been impactful for us, and we think that helps us quite a lot in terms of new customers and share of wallet growth.
Okay. Lastly, on that point you're making about digital marketing and marketing spend, how are you thinking about the incremental dollar and spending at what medium and customer acquisition cost as you look at different options online and you also allocate your dollars from print to media?
Yeah. It's really been a shift. We've become more efficient with our marketing spend and a lot of digital has come as we've shifted away from print and traditional, conventional marketing media, because print is still very prominent, and we've just shifted those dollars more efficiently and more effectively. I've always said, it's better for this business. Real-time store specific items, digital supports that in a way that print never could. It's been beneficial both from an efficiency standpoint, but also from an effectiveness standpoint and fitting with our model as well.
Our next question comes from the line of John Heinbockel with Guggenheim. Please proceed with your question.
Maybe for R.J. I know a lot of the stuff you've done with the procurement department has been with internal folks. Have you expanded that group here or intend to as part of the investment? Thoughts on that. Secondarily, where do you think you sort of end up here on the private brand journey? Particularly, we're in a downturn and it may last for a while.
Yeah. We have expanded the group. One of the best investments we make is in people. The group has grown as the business has grown. Part of that related to specialization, part of that just related to a growing business. We'll continue to invest in people and would expect that to continue to be a very positive return for us. Then, for private label, we haven't increased the priority on that. It still remains on the list as far as future roadmap goes. We continue to see plenty of supply from an opportunistic standpoint, so that's always preferred. It's something that we'll keep on the list, and we'll determine when or if it becomes a higher priority in terms of assortment strategy.
Then maybe as a quick follow-up, WOW alerts in a consolidating trip environment, right? I know they were very effective, right, in getting people in more frequently. How effective are they in COVID-19, and then have you changed your approach in COVID-19?
Yeah. Very effective, John. For one, it's a great way to communicate to customers what we have in the store. If they're not sure about making a trip or they're trying to decide where to go, we think it's even more relevant now than ever. A great way to communicate that to customers. When we think about personalization, it's really about expanding WOW alerts. To show them more of the store, take it outside the four walls and make it more specific to the customer for the items or the categories that they're looking for. Really pleased that we have that and we expect that to be an important part of digital marketing for us ahead.
Thanks.
Our next question comes from the line of Karen Short with Barclays. Please proceed with your question.
Hi. A couple questions for you, maybe a little more housekeeping-ish. First would be, can you give us a little bit of an update on the promotional environment and whether, say, from your conventionals, if you've noticed an uptick in the promotional environment from them? The second is, you called out commodity cost increases going forward. Could you just give a little color on what you're seeing on inflation and what your expectations are? Then I just had one question related to the IOs.
Hey, Karen, Eric. Thanks for the question. I would say, nothing unique in the promotional environment that you all haven't seen and read about. I think, if you paid attention to the Albertsons and Safeway call, they just couldn't rely on suppliers. Inventory was down. It was very difficult to promote. People are starting to get back into the fresh side where control is a little bit better. We have not seen a whole lot different than what you all write and describe. We're not seeing any new competitive activity or any gimmicks in any of the markets. I'd say it's pretty much status quo to what we've read as well.
Karen, this is Charles. Let me address the inflation question. Yeah, we didn't feel much inflationary cost pressure in the second quarter, but we are now starting to feel that across a number of categories, including meats and deli and produce. We do expect that's going to be a bit of a gross margin headwind in the back half of the year that we didn't see in the first half. Again, we love the fact that our model allows us to mitigate some of those inflationary pressures because we can buy and merchandise flexibly. We do think nonetheless it will be somewhat of an impact in the back half.
Okay, thanks. Just quick question on the IOs. Can you just give us an update, if you did, I missed this bit on the interest rate relief that you had called out in 1Q for the IOs.
Yeah, that continues to be the case. We've given relief to the IOs to the tune of a 50% reduction in their interest rate. As I mentioned before, it's one of many COVID-related costs that we're absorbing, and we would anticipate to continue to do so as we work our way through the pandemic.
Our next question comes from the line of Simeon Gutman with Morgan Stanley. Please proceed with your question.
Hey, guys. It's Simeon. My first question is a modeling one with two parts. The first part is, could gross margins be up again in 2021 for any reason? Related to it is, incremental margins in general for this business have been in the mid-single-digit range, and that's with your normalized comps of, let's say, 4%- 5% or 6%. When we start normalizing to those levels, should the incremental margins follow? Any reason why they should be stronger or weaker than those historical numbers?
Yeah. Simeon, this is Charles. Let me try to tackle both of those. First of all, with respect to your gross margin question, really pleased with the performance we saw in the first half of the year. Again, shrink was a big benefit just because of the sustained momentum on the top line, so we saw much lower markdowns and throwaways. We've always said that over the long term, we take the view of managing for stable margins, and I'd say that's true both with respect to the gross margin line as well as adjusted EBITDA margin lines. We're just starting our initial planning for 2021. We very much expect it will be a fluid environment in which we'll be operating.
Again, what I can tell you is longer term, we manage the business for stable margins, and again, both gross margins and adjusted EBITDA margins. The reason is because of the reinvestment that we've talked about. You will definitely have quarters, you can have quarters like we had in Q2 where really up and down the P&L, the stars aligned, and we saw some nice flow-through. Our objective would be to make sure that we're doing the right things to reinvest in talent and in infrastructure to ensure our success as we continue to grow stores.
Okay, my follow-up is with regard to the IOs and some of the training that was mentioned. First, I don't know if you'd say this, but was the tone that you used this quarter in terms of the script around training, was a little bit more urgency or heightened importance? Second of all, if it was, can you talk about the performance gap over the past two quarters among stores, or is it widening? Is there anything in terms of the IO P&L that's differing? What is the urgency or, let's say, the heightened importance on the training?
Yeah. Hey, Simeon. Eric. I think you picked up on it correctly. The urgency's all about scaling and just the reflection that we have 70 to 75 to 80 inbound AOTs per year that we're training and getting ready to go out into the system. I'd say second, if you're your traditional grocery manager that's thinking about another opportunity, this is probably not the year that you're looking. We're dipping our toe into some other candidates from outside of the grocery arena. It's an opportunity for us to upgrade the training and, both from a forced virtual training, to combine with what we're doing in the stores. Two, to train people on the grocery business that may possess other skills, entrepreneurial or customer service or back office. I would say it's all of those things.
I think you've heard themes throughout from us that, if it's working well, that's a good time for us to pick at it and see if we can't improve it. Just a thread of continuous improvement would be probably the final.
Thanks, Eric.
Our next question comes from the line of Joe Feldman with Telsey Advisory Group. Please proceed with your question.
Hi, guys. Thanks for taking the question. I wanted to go back to R.J. You were talking about personalization and your response to John about it as well. How are you tailoring the message on those WOW alerts? That's kind of how I think about personalization. Or is it just like you're increasing the number of WOW alerts sent to people? What is actually happening there?
Personalization, we're in the very early innings still, Joe, of planning how we can become more customized and personalized. Mentioned in the comments, this welcome series email campaign that we put out to new customers, specific to them. They're new to the model, it is about introducing and educating them because it is a different kind of shop, and we want customers to understand that. The WOW alerts are still now not personalized to customers. They're specific, as they've always been s pecific to stores and items.
They're local, they're real-time, and they reflect some of our best value, highest velocity items. The next phase then with WOW alerts, once we start tracking more customer-specific information, would be to have that specific to you, Joe, versus someone else based on what you like, what you buy, and other suggestions of things that you'd find interesting. We have super high engagement from these WOW Alert emails that go out. Customers look for them. They open them. They react to them. We think we can increase that engagement further still when it becomes even more relevant to you, and your specific needs.
Great. Thank you for that. I guess a follow-up, maybe also for you, R.J., was the opportunistic buys that you're seeing out there. Are there any categories within the space that's really heavy and that's like there's too much of it and you can't take all of it, obviously, or is it pretty broad-based? Is it where you're seeing the opportunities?
Yeah. It's really broad-based. To the extent that there ever are situations where it's too heavy or lighter, so to speak, I'd say those are for long history of this company operating with this model, it's just part of normal fluctuations and cycles that happen. Yeah, on the whole and over a reasonable period of time, it's healthy. Nothing specific to categories. It's ample really across all and things move around, but not of any significance to point to that I'd call out one category versus another.
Our last question comes from the line of Jeremy Hamblin with Dougherty & Company. Please proceed with your question.
Thanks, congrats on the strong results. I wanted to start with a question on the store openings. You increased your guidance by a couple of units. In terms of, as we look forward into 2021, can you provide any commentary on the quality of the real estate opportunities you're seeing, the quantity of real estate opportunities, and whether or not, kind of what's transpired here in 2020 makes you think a little differently about the types of locations that you might look at going forward? I had a follow-up question.
Hey, Jeremy here. I'll take the latter part of the question. No change in direction in terms of the types of sites that we're going to consider. We're always looking for great real estate, whether it's a dense market or rural market, we want to be sort of where people are and they're used to shopping. I'd say that would be an overarching for us. Relative to long term to target, we think the 10% unit growth works really well. The pipeline for 2021 is very strong. We've continued having our real estate meetings monthly, approving sites, getting leases signed. We've continued to go out and look into markets. We're excited about both the finish of this year and the prospects for next year.
I think relative to the big question that we've gotten from a number of people is what do we think is going to happen in years 2021 and 2022 relative to supply. I would say the markets that we operate in for many years have been pretty competitive. Lots of people looking in the 15,000 sq ft, up to 30,000 sq ft. We've been able to be really flexible, split up boxes like Kmart and Sears and other retailers that are giving up sites and get into 10,000 sq ft all the way up to 30,000, 35,000 sq ft. I think what is gonna happen is this greater real estate market sort of gives back square footage. We're gonna have more opportunities versus less. If we have more opportunities, I think we'll have a good focus on quality.
At the same time, I think there could be some opportunities relative to what we have to pay to get into those sites.
Okay. That's great. Just in terms of, I wanted to ask a follow-up question actually on PPE costs. In terms of now we're many months into the pandemic, it seems as though there's been some efficiency gains in terms of managing simply because we have better visibility on what needs to be done and there's less of a scramble in terms of getting PPE to the team. Can you give a sense on whether or not the impact of those costs, is that starting to diminish as it relates to the overall total cost, the % cost of sales? Just any color you might be able to provide on that would be helpful.
Jeremy, this is Charles. Let me try to provide a little bit of insight there. I would say, and I should emphasize, everything we're seeing for COVID costs for us given our model, it's across a number of areas and it hits several different lines in the P&L. Some of that's expense, some of it's capital. Everything from our distribution centers to costs in our corporate office for the staff that remains and all the work-from-home costs. Everything I talked about that we're doing at stores, both from a support standpoint for IOs as well as incremental capital that we put into the stores. It's a number of things. It was a significant impact to us in Q2 and really was one of the key drivers as to why we de-levered SG&A in the quarter.
While there may be some efficiencies we're seeing, it's going to continue to be a significant cost for us until we get on the backside of COVID. From a modeling standpoint, it's really one of the reasons why we're trying to orient folks towards the back half of the year and adjusted EBITDA margins, again, being slightly lower than prior year.
Okay. Great, guys. One last question maybe on your debt, and you kind of repaid or pulled that debt down. In terms of thinking on a go-forward basis, you're generating a lot of cash. Is that a priority to potentially reduce the overall debt levels here as we move into 2021 or into 2022?
Yeah. The way we're thinking about it, Jeremy, is that until we get, again, on the backside of COVID, let's just take the conservative approach and continue to put excess cash back on the balance sheet. We feel great about the liquidity position. As you point out, we've got plenty of internal cash flow to fund our investments in growth. As a result of how good we felt, we did take the opportunity to repay the revolver in May. I think what we've done is decided to table the longer-term discussion around what's the right leverage ratio ultimately for this business, and then what do we want to do with excess cash after that. I think that, again, that'll be a conversation we can revisit once we get some more clarity around COVID.
This concludes our question and answer session. I'd like to hand the call back to Eric Lindberg for closing remarks.
Hey, thanks everyone for joining us. Appreciate all your questions, and we look forward to catching up with you individually after this call. Thanks so much. Take care.
Ladies and gentlemen, this does conclude today's teleconference. Thank you for your participation. You may disconnect your lines at this time, and have a wonderful day.