As the Q3 earnings season comes to a close, it’s time to take stock of this quarter’s best and worst performers in the auto parts retailer industry, including Genuine Parts (NYSE:GPC) and its peers.

Cars are complex machines that need maintenance and occasional repairs, and auto parts retailers cater to the professional mechanic as well as the do-it-yourself (DIY) fixer. Work on cars may entail replacing fluids, parts, or accessories, and these stores have the parts and accessories or these jobs. While e-commerce competition presents a risk, these stores have a leg up due to the combination of broad and deep selection as well as expertise provided by sales associates. Another change on the horizon could be the increasing penetration of electric vehicles.

The 5 auto parts retailer stocks we track reported a softer Q3. As a group, revenues were in line with analysts’ consensus estimates.

While some auto parts retailer stocks have fared somewhat better than others, they have collectively declined. On average, share prices are down 2.3% since the latest earnings results.

Genuine Parts (NYSE:GPC)

Largely targeting the professional customer, Genuine Parts (NYSE:GPC) sells auto and industrial parts such as batteries, belts, bearings, and machine fluids.

Genuine Parts reported revenues of $5.97 billion, up 2.5% year on year. This print was in line with analysts’ expectations, but overall, it was a softer quarter for the company with full-year EPS guidance missing analysts’ expectations significantly.

Unsurprisingly, the stock is down 14.1% since reporting and currently trades at $122.99.

Read our full report on Genuine Parts here, it’s free.

Best Q3: O'Reilly (NASDAQ:ORLY)

Serving both the DIY customer and professional mechanic, O’Reilly Automotive (NASDAQ:ORLY) is an auto parts and accessories retailer that sells everything from fuel pumps to car air fresheners to mufflers.

O'Reilly reported revenues of $4.36 billion, up 3.8% year on year, falling short of analysts’ expectations by 1.3%. The business performed better than its peers, but it was unfortunately a mixed quarter with an impressive beat of analysts’ EBITDA estimates but full-year EPS guidance slightly missing analysts’ expectations.

O'Reilly scored the highest full-year guidance raise among its peers. The market seems content with the results as the stock is up 1.3% since reporting. It currently trades at $1,215.

Is now the time to buy O'Reilly? Access our full analysis of the earnings results here, it’s free.

Slowest Q3: Monro (NASDAQ:MNRO)

Started as a single location in Rochester, New York, Monro (NASDAQ:MNRO) provides common auto services such as brake repairs, tire replacements, and oil changes.