Security company licensing in Missouri
Missouri does not license security companies at the state level, so there is no state roster and no license number for a company to show you. That is not a mark against any company operating there.
Missouri has no statewide security company licence. State law instead delegates private-security licensing to city police boards — Kansas City and St. Louis each run their own scheme, and Springfield, St. Joseph and Joplin license locally. Neither major city publishes a machine-readable roster.
Missouri city Boards of Police Commissioners (no state regulator) →What you can still check
There is a second license, and in Missouri it may be the only one that exists: the guard’s own.
What a guard and a company should hold in Missouri, and how to confirm it →