Display screen or portion thereof with a graphical user interface

[0001]FIG. 1 is a front perspective view of a handheld computing device with a display screen or portion thereof with a graphical user interface according to a first embodiment showing a first image in a sequence according to the new design;

[0002]FIG. 2 is a front view thereof;

[0003]FIG. 3 is a front view of a second image thereof;

[0004]FIG. 4 is a front view of a third image thereof; and,

[0005]FIG. 5 is a front view of a fourth image thereof.

[0006]The design sequentially transitions between the images shown in FIGS. 2-5. The process or period in which one image transitions to another image forms no part of the claimed design.

[0007]Broken lines in FIGS. 1-5 show portions of a computing device with the display screen or portion thereof with a graphical user interface and form no part of the claimed design.