Display screen or portion thereof with an animated graphical user interface

This application is related to U.S. Design patent application Ser. No. 29/524,725, filed Apr. 22, 2015; U.S. Design patent application Ser. No. 29/524,726, filed Apr. 22, 2015; U.S. Design patent application Ser. No. 29/524,728, filed Apr. 22, 2015; and U.S. Design patent application Ser. No. 29/524,730, filed Apr. 22, 2015, each of which is hereby incorporated by reference in its entirety.

FIG. 1 is a front view of the first image of a display screen or portion thereof with an animated graphical user interface;

FIG. 2 is a front view of the second image;

FIG. 3 is a front view of the third image;

FIG. 4 is a front view of the fourth image; and,

FIG. 5 is a front view of the fifth image.

The broken lines illustrate the display screen, portions of the animated graphical user interface, and portions of an electronic device. None of the broken lines form part of the claimed design.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-5 . The process or period in which an image transitions to another image forms no part of the claimed design.