Abstract The bluntnose sixgill shark (Hexanchus griseus) is a globally distributed large‐bodied predator, primarily associated with deep‐sea environments. Due to the logistical constraints of its habitat, much remains unknown about the life history and behavior of H. griseus. While typically considered solitary, this species has occasionally been observed in aggregate; however, these events are almost exclusively associated with foraging or the presence of introduced bait. Here, we present a novel unbaited observation of a mixed‐sex aggregation of at least seven H. griseus individuals near Ulong Channel, Palau. This represents the first peer‐reviewed report of such an aggregation in Micronesia. Observed in close proximity at relatively shallow daytime depths via a remotely operated vehicle (ROV), the individuals did not exhibit foraging behavior. The absence of attractants and presence of scarring on female individuals suggest potential social or reproductive drivers for this aggregation. A subsequent resighting of two individuals at the same location indicates short‐term site fidelity. These findings provide rare in situ insight into the social structure of H. griseus and highlight the potential importance of this area as a critical habitat for this species.
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