According to clinicaltrials.gov, there are 26 trials in progress which are stem cell based. The link to the list is as follows
Four groups dedicated to using stem cell therapies to treat Parkinson’s disease have formed an international consortium known as G Force PD. Each of the four centers is planning a clinical trial to start in the next 1-4 years. They differ on the source of stem cells that they will be using (ESCs vs iPSCs). All will be injecting the cells directly into the basal ganglia part of the brain where the ends of the dopamine producing neurons live. The Parkinson’s community eagerly awaits the implementation of these trials.