Rock Ventures LLC is the holding company for businessman Dan Gilbert's portfolio of companies, investments, and real estate.

[3] Its over 110 affiliated companies included the Cleveland Cavaliers, Hollywood Casino at Greektown, and Rocket Mortgage.

[4] Rock Ventures was founded by Dan Gilbert in 1985.

[5] By 2018, Rock Ventures accounted for 17,000 jobs in the City of Detroit, making it the largest employer and taxpayer in the city.

ROCK is the office that connects the Family of Companies to the For More Than Profit philosophy created by Dan Gilbert [7] Especially under the subsidiary holding company, Rock Holdings Inc., Rock Ventures, LLC owns a number of complementary financial service companies, including:[8] Rock Ventures has invested in a number of companies, primarily in Detroit and Cleveland areas, including:[9][10] Rock Ventures owns a number of real estate investment, development, and service companies, including:[11] Rock Ventures owns, or is the majority owner of, a number of sports companies, including:[14][15] Rock Ventures is an owner of a number of technology companies, including:[17] Rock Ventures is an owner of over 75 real estate properties, primarily in Detroit, including:[18][19][20] Rock Ventures is engaged in community development, philanthropy, and government relations in both Detroit, Michigan and Cleveland, Ohio.