UW Oshkosh is estimated to have seen a 4.7% drop in enrollment, the largest decrease in the Universities of Wisconsin system, according to preliminary data released Sept. 16. UWO, one of five Universities of Wisconsin (UWs) to see a decrease in first-day student headcounts, reported 13,127 undergraduate, graduate and high school students on the first day of classes, which is a decrease of 651 students from last year’s 10-day enrollment figures.