Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 2 months ago

I think it is 110 sahabah and 84 tabi'un, although I could be missing some since it's a big book.

This website has an extensive resource on the hadith of ghadir which may be of interest: https://www.al-islam.org/ghadir/