Yes: https://developer.apple.com/documentation/uikit/uiactivityviewcontroller/completionwithitemshandler-swift.typealias
Upon successful sharing in the system share sheet, the source app can see the bundle ID of the destination app or activity ID for iOS functions. These look like:
com.apple.UIKit.activity.CopyToPasteboard
com.apple.UIKit.activity.Mail
com.apple.UIKit.activity.Message
net.whatsapp.WhatsApp.ShareExtension
etc.
(No other data is available there, so apps cannot see e.g. WHO you shared with, as far as I know)
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