Is it possible to run multiple initial Activities simultaneously in an app?

In an Android application, it is not possible to launch multiple initial Activities simultaneously, as the concept of "initial Activity" (launcher Activity) implies a single entry point that is started when the application is launched from the launcher.

However, in the manifest, you can declare multiple Activities with intent-filters for the MAIN action and LAUNCHER category, then multiple icons will appear in the app list, each launching its own Activity.

If the goal is to launch multiple Activities at the same time within a single app launch — this is impossible, as Activities operate in a single window and are managed by a task stack. You can launch new Activities on top of current ones, but only one will be active at any given moment.