What happened Shares of Sprouts Farmers Market (NASDAQ: SFM) climbed 20.9% during May, according to data provided by S&P Global Market Intelligence. The company kicked off the month by reporting earnings for the first quarter of 2020 and giving a quarter-to-date update for the upcoming second quarter. These positive results have fueled Sprouts Farmers Market's market-beating returns in 2020. SFM data by YCharts. So what Sprouts Farmers Market ended 2019 by giving unimpressive guidance for 2020. It expected revenue to grow 1% at best. And for most of Q1, it was on pace for those pedestrian results. However, once the COVID-19 pandemic closed restaurants, consumers shopped at the grocery store more, boosting the company's results dramatically. Comparable-store sales at Sprouts grew 10.6% in Q1. Of that, management attributed 9.6% of the gain to the coronavirus. This unexpected surge had an added benefit: The company gained operating leverage and delivered net income of $92 million. That was a 64% year-over-year increase. Sprouts' surging revenue is consistent with grocery retail in general. According to the Census Bureau, grocery-retail sales in March increased 30.9% from March 2019, and April sales posted a 13.2% year-over-year gain. Image source: Getty Images. Now what The Census Bureau data showed slowing grocery-sales growth in April, and that's true of Sprouts too. Comp sales were only up 7.2% in April. That's still very good for this company, but it's down from late March. Furthermore, profitability shouldn't be as good in Q2 as it was in Q1. The company is paying out employee bonuses, which will weigh on Q2 net-income results for this mid-cap stock. 10 stocks we like better than Sprouts Farmers MarketsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Sprouts Farmers Markets wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of April 16, 2020 Jon Quast has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source