A boost from the Barbie movie wasn't enough to keep Mattel's full year sales from coming in flat ... [+] compared to the previous year. (Photo by AaronP/Bauer-Griffin/GC Images) GC Images A holiday boost in toy sales wasn’t enough to make up for sales declines during the rest of the year, leaving Mattel MAT to end 2023 with full-year net sales down 1% in constant currency, compared to 2022. The toymaker today reported fourth quarter net sales of $1.621 billion, up 16% (14% in constant currency) compared to ...