Here is another post siphoned-off from the catch-all Young Actors post, which was getting a bit cumbersome to read. The diversification of the categories started in 2010 when Lead and Supporting categories were split. They were unisex for that year then divided by gender in 2011.
2018 Isabella Sermon Jurassic World: Fallen Kingdom
2017 Chiara Aurelia Gerald’s Game
2016 Alexa Nisenson Middle School: The Worst Years of My Life
2015 Isabelle Fuhrman All the Wilderness
2011 Elle Fanning We Bought a Zoo
Best Performance by a Child Actor in a Supporting Role
2010 Janina Fautz The White Ribbon