Cathie Wood has been taking it slow with her shopping sprees lately. The co-founder, CEO, and chief investment officer at Ark Invest has been doing more selling than buying across her firm's aggressive growth exchange-traded funds (ETFs). Wood kicked off the new trading week by buying shares in Space Exploration (NASDAQ: SPCX), Roblox (NYSE: RBLX), and Alamar Biosciences (NASDAQ: ALMR). They were the only three stocks she purchased on Monday. Let's take a closer look at these fresh purchases.