As Amazon (AMZN) seeks to move into several different market sectors, companies including Zillow (Z, ZG), Best Buy (BBY) and Core-Mark (CORE) have been brought into focus on the risk of increased competition.

REAL ESTATE: Amazon seems to be preparing to offer consumers the option to hire real estate agents through its professional services marketplace, real estate news site Inman reports. The service would likely be in exchange for referral fees, the website says. Inman noted that Amazon has a placeholder webpage, indexed in its Home and Business Services, that allows users to “Hire a Realtor,” and reported the company has sought help to integrate agents into its professional services marketplace. Following the report, shares of online real estate marketplace Zillow dropped. 

TECH REPAIRS: Meanwhile, Best Buy slid 7% on Monday following a report that Amazon has rolled out its own service to compete with the big box store’s “Geek Squad” installation and repair service. Reports said the tech giant has in-house gadget experts that offer free Alexa consultations as well as product installations for a fee inside customer homes. Loop Capital analyst Anthony Chukumba issued a note on Monday saying he viewed the selloff as overdone as he believes Best Buy’s Geek Squad offers a much more comprehensive set of services than Amazon does. He kept a Buy rating on the name with a $72 price target. BofA/Merrill analyst Curits Nagle had similar views, saying the rollout of Amazon’s service will have a limited impact on Best Buy as it has competitive advantages, a strong head start in services, and there is plenty of room for growth for both companies in smart home devices.

FOOD DISTRIBUTION: Loop Capital analyst Andrew Wolf said he sees Core-Mark as the least likely company among those he covers to get “Amazoned,” or put at risk by Amazon buying a competitor. Its closest competitor McLane, which is owned by Berkshire Hathaway (BRK-A, BRK-B), is highly unlikely to sell to Amazon given that its largest customer is Amazon’s rival Wal-Mart (WMT), Wolf tells investors.