Music service Pandora was acquired by SiriusXM in a deal that was completed in February 2019.
Before that acquisition, Pandora reported its monthly active user count to investors as a publicly traded company.
After the acquisition, SiriusXM has continued to announce Pandora’s MAU number to its own investors each quarter.
Below you can see visualization of this data, covering annual Q4 results plus, more recently, every quarter of each year.