We report timing and spectral properties of the transient X‐ray pulsar EXO 053109‐6609.2 using observations carried out with ASCA, BeppoSAX, and XMM‐Newton observatories. Pulse period measurements of the source show a monotonic spin‐up trend since 1996. The pulse profile is found to have a strong luminosity dependence, a single peaked profile at low luminosity that changes to a double peaked profile at high luminosity. The X‐ray spectrum is described by a simple power‐law model with photon index in the range of 0.2–0.8. A soft excess over the power‐law continuum is also detected from XMM‐Newton observation. © 2004 American Institute of Physics