Shiffrin finished 0.29 seconds ahead of fellow American Paula Moltzan to collect her 80th World Cup win in 1:43.26. Lena Duerr (31) of Germany finished third in 1:43.60.
"I don’t really have anything I can say about (this) that has not already been said. I don’t even understand it yet," Shiffrin said on the skiing governing body's (FIS) website regarding her 80th win and closing in on the record.
Thursday's win made her the first ski racer to collect 50 titles in a single discipline. It is the second time Shiffrin has swept the board in Semmering after doing so in 2016.
"It is pretty hard to put into words. I skied really strong all three days and was really happy with my feeling," she said.
A fourth straight win caps a remarkable turnaround for Shiffrin in 2022 after the three-time Olympic medallist surprisingly left this year's Beijing Games empty-handed.
