Here are the stocks making notable moves in extended trading:
Costco — The wholesale membership club retailer was down about 2.8% after hours Thursday before reporting fiscal fourth quarter earnings postmarket.
Guidewire — The software maker rose 0.9% after authorizing a $400 million buyback.
Scholastic — The education company fell 2% after reporting an 82% decline in fiscal first quarter operating income and 74% lower earnings before taxes. Revenue grew 1%.