Light Gauge Steel Framing is a convenient construction solution for low and mid-rise buildings. In Light Gauge Steel Framing construction for buildings, chord studs are the most demanded elements, both under gravity loads and under lateral actions (seismic and wind). Therefore, given the rather low axial capacity of cold-formed steel studs, steel framing has been considered mainly for low-rise buildings only; even code limitations on the number of storeys apply. To overcome this limitation, built-up or tube sections have been proposed for such end studs; recent researches also propose filling the steel sections with concrete. This paper presents an experimental campaign on steel-only and concrete-filled stud specimens. The experiments are axial loading tests of stud segments; all share the same built-up steel section consisting of two C-lipped 100×50×20 profiles. The test specimens are distinguished by their type of section (steel-only or concrete-filled), length (short, mid or long), and presence or absence of battens joining the long C-lipped 100×50×20 profiles (the short and mid specimens are unbattened). The main features of the tests are: (i) the built-up sections are optimized, being formed by only two C-lipped profiles, (ii) the influence of the buckling modes is individually assessed by testing short (local buckling), mid-length (distortional buckling), and long (bending-torsional buckling), (iii) the C-lipped profiles are joined with battens (thus avoiding drawbacks and uncertainties of joining with continuous plates), (iv) the influence of battens is investigated by comparing the results of battened and unbattened studs (for the long studs), and (v) the influence of the concrete is investigated for each buckling mode by comparing the results of steel-only and concrete-filled studs.