In the end, it doesn't matter unless you are a shareholder. Rivian got help in getting their line running from Ford, and Ford got to dip their toe in the EV world without a major commitment. In my opinion, Ford was caught off guard by the interest in EVs and just moved all their plans up in manufacturing them. Don't forget there were original plans to develop a vehicle jointly. With that taken into account, it makes sense that Ford would own a stake in Rivian. Now that getting production online is finished, no joint vehicle and Ford decided to do a full press with EVs, why would the two want to continue with a partnership? Rivian got their money from the sale, and RJ likely is glad to be rid of them. The pain is real for investors, but they have a bright future if the company continues to ramp up and deliver what they have so far.