Could these companies create the next gen of the wealthiest real estate players? We broke down the top five fastest-growing real estate companies in the country, ranked by Inc.'s list of the 5,000 fastest-growing private companies in 2015.

Excel Group

Rank: No. 83

Revenue: $16.5M

Year-Over-Year Growth: 3,702%

This PERE firm specializes in hotel loans throughout the East and owns and manages more than a dozen hotels, each valued at $2M to $25M. Just last month, it acquired Aloft BWI Airport Hotel in Baltimore.

Fathom Realty

Rank: No. 128

Revenue: $18.1M

Year-Over-Year Growth: 2,860%

A fast-growing brokerage that operates in 17 states, the California firm is led by CEO Joshua Hartley. It offers more than 150 real estate training courses online.

The K Company Realty

Rank: No. 181

Revenue: $5.5M

Year-Over-Year Growth: 2,262%

There’s not a lot of news out there about this Florida-based firm headed by CEO David Klutznick (pictured)—though it was praised in the South Florida Business Journal for hiring 350 agents last year. Guess its 100% commission (minus $59/month/transaction) structure is working to attract brokers.

Mainstreet Realtor

Rank: No. 228

Revenue: $175.1M

Year-Over-Year Growth: 1,924%

Mainstreet specializes in residential dealings and is helmed by founder Mary McCoskey Finkle (pictured). The small Indiana-based firm has five realtors, including Mary, but is doing deals like crazy.

My Home Group Real Estate

Rank: No. 260

Revenue: $2.7M

Year-Over-Year Growth: 1,736%

The fifth fastest-growing real estate company is My Home Group. Established in 2014, the firm handles residential deals throughout Arizona and posted $2.7M in revenue within a year of its founding.