Apple yesterday confirmed its rumored acquisition of music identification app Shazam, but declined to say how much it paid (some reports suggest around $400 million).

Bottom line: This is normal operating procedure for Apple, which has only disclosed purchase prices for 15 of its 68 acquisitions, according to Thomson Reuters.

Reproduced from Thomson Reuters Dals Intelligence; Note: Data as of Dec. 11, 2017; Chart: Axios Visuals