In February 2016, the City and County of Denver and eight private investors closed on the city’s first social impact bond, an $8.6 million investment to fund a supportive housing program for 250 of the city’s most frequent users of the criminal justice system. The city will make outcome payments over five years based on the initiative’s goals of housing stability and a decrease in days spent in jail by participants. This brief details the fourth assessment of housing stability payment outcomes and interim housing stability outcomes for the program.