These green berries will turn black later in the year. As far as I can tell it’s not a choke cherry, whose berries grow in grapelike clusters. Each of these berries has its own stem, no clustering.
Thanks in advance.
Looks like Rhamnus cathartica, common buckthorn.
Indeed it does, thanks so much!
Note: buckthorn is considered an invasive species in many locations. If you wish for it to spread to neighboring territory, do nothing.