The current Waltons don't really care about Arkansas sports, they're more into art and bike trails and have invested millions into those in Northwest Arkansas. Every other fanbase assumes they just hand out money to Razorback sports though lol.
The JB Hunt Trucking Co. family has been very involved however, started an NIL consortium for Arkansas athletes. Other than them it's been mostly small businesses for the NIL deals that have been made public so far. I just don't see many huge companies like Walmart investing in college athletes but some of their local vendors and suppliers may which would benefit Arkansas by proxy.