  Relying on the main results of [Guralnick-Tiep], we classify all unitary
$t$-groups for $t \geq 2$ in any dimension $d \geq 2$. We also show that there
is essentially a unique unitary $4$-group, which is also a unitary $5$-group,
but not a unitary $t$-group for any $t \geq 6$.
