Cathie Wood's ARKK fund bought Archer Aviation ($ACHR) (446,848 shares) and Oklo ($OKLO) (107,321 shares) today. Concurrently, ARKK sold shares in Tesla ($TSLA), Palantir ($PLTR), Rocket Lab ($RKLB), and Shopify ($SHOP). Investors may want to monitor these movements as indicators of ARK Invest's current strategy.