Cathie Wood bounced back in 2023 after back-to-back years of disappointment. The CEO and co-founder of Ark Invest is trying to keep her winning streak going as an aggressive growth-stock investor this year. She's been adding to some of her existing positions in 2024, including a few notable purchases on Monday. Wood kicked off the new trading week by adding to her stakes in Nu (NU 0.06%), MercadoLibre (MELI -0.24%), and Toast (TOST -0.24%). Let's see what she might be seeing in these promising growth stocks ...