I think there is no direct way to do that. Because that information is not available anywhere in the manifest or source code.
As a workaround, you can get the process name/package name, and find publishers name from google play store:
Pseudo code:
List<ApplicationInfo> appInfos = context.getPackageManager().getInstalledApplications(0);
for (ApplicationInfo appInfo : appInfos) {
String processName = appInfo.processName; // Example: com.google.android.youtube
String url = "https://play.google.com/store/apps/details?id=" + processName;
// Fetch publisher name from web here
...
}