Propstack Competitors

CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom. CoStar Group’s websites attracted over 143 million average monthly unique visitors in the third quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.

Buildium is the only property management solution that helps real estate professionals win new business from property owners and community associations seeking services. Backed by expert advice and relentless support, Buildium enables you to outperform across all facets of your business with intuitive software that balances power, simplicity, and ease of use. Buildium services customers in more than 50 countries, totaling over 2 million residential units under management.

LoopNet is the most visited commercial real estate marketplace, covering For Sale and For Lease properties across all commercial property categories. With 13 million monthly unique visitors, listed properties receive unrivaled exposure to the largest CRE tenant and buyer audience. Search or list commercial real estate on LoopNet. LoopNet is a part of CoStar Group, Inc. and is headquartered in Arlington, VA.