Realogy and Keller Williams are at the top of the real estate industry these days, according to the second annual Swanepoel Mega 1000 list of the country’s top 1,000 brokerages along with top 20 franchisors and holding companies. The Mega 1000, compiled by real estate consulting and analytics firm T3 Sixty, uses U.S.-only sales volume as the sorting standard, as T3 Sixty believes it’s the best way to measure a company’s overall strength, aside from actual net revenue numbers.