Tax Lien Certificate Transfers - AZ

[Kelley Moffat]

It has come to my attention that it is possible to buy existing tax lien certificates (that are owned by another party) in all 3 counties where I bought certificates for 2019 taxes (several of the properties have existing tax liens).  My question is - is there any way to find out who the certificate holder is?  I have looked at the tax history on several of the properties with no luck.  I can't imagine the Treasurer's office would share that information and while I can see the winning bidder number on the sale website there's no further information.  Any help would be appreciated :-).  Thanks in advance.