The article outlines the findings from excavations at Uyelgi mound 11, the most informative one at the cemetery. Its lower horizon revealed a burial demonstrating features highly indicative of the nomadic culture of the Southern Urals. The upper horizon contained two burials belonging to the Srostki culture, characterized by certain artifacts of the “Hungarian” (Carpathian) type, evidencing the return of some South Uralic groups from the west at the time when the Srostki people migrated in the opposite direction from Eastern Kazakhstan and the Altai. This conclusion is supported by findings from the Aktobe cemetery, where typically “Hungarian” ornaments of horse harness co-occur with a belt set with floral decoration following the Srostki tradition of the Altai. Inside the mound and on the platform under it, fragments of five clay vessels were found, most of which are decorated with comb-and-cord patterns of the post-Bakal, Nevolino, and Petrogrom-Yudina type, associated with the East Uralic and West Siberian Ugrians. In terms of spatial structure, stratigraphy, and typology, then, the Uyelgi mound 11 demonstrates at least four cultural horizons: South Uralic, “Hungarian” (Carpathian), Altaic (Srostki), and Ugric (East Uralic and West Siberian), jointly mirroring complex ethnic processes in the region between 800–1000 AD.