As of the last fiscal year report, Nintendo had 5,064 employees around the world. That info came from last year's shareholder meeting. With the latest shareholder meeting in the books, we have an update on the total. Nintendo has added a few more employees, as they now have a total of 5,166 working around the world. If you're wondering, 2,133 of them are working in Japan.
Also worth noting, as far as we can tell, Nintendo's total employees hit their peak in 2014, with 5,213 staff members around the world.