According to Official Guinness Records,
The most hula hoops spun simultaneously is 200 and was achieved by Marawa Ibrahim (Australia) in Los Angeles, California, USA, on 25 November 2015. This is Marawa's 4th time breaking this record. Here is her 2014 attempt:
For a complete list of 2015 records, please visit 2015 Guinness Records in United States.