The binturong Arctictis binturong and yellow-throated marten Martes flavigula are widely distributed through much of Southeast Asia, yet their natural history remains poorly understood. We radio collared and tracked five male binturongs, and five yellow-throated martens (four males and one female) for 4–23 months in Phu Khieo Wildlife Sanctuary, Thailand. For binturongs, mean annual range size (± SD; 95% minimum convex polygon) was 6.2 km² (± 1.0), and mean range overlap was 35%. Wet season ranges were larger for most binturongs. Binturong mean daily distance was 688 m (± 667). A cumulative activity pattern of 47% indicated that binturongs were arrhythmic and crepuscular. Yellow-throated martens showed an annual range of 7.2 km² (± 4.3) and exhibited overlapping ranges of 34%. Yellow-throated martens traveled an average of 966 m/day (± 834) and activity (58%) was characterized as diurnal, but increases in nocturnal activity increased during lunar nights (± 7 days from full moon).