The short answer is that it's very hard to know as Jet was a fairly unusual company. They raised (and spent) a tremendous amount of capital and it's not generally known what terms those raises were done on.
If the terms were favorable (standard preferred stock) the employees likely made several billion dollars (in aggregate) on the deal. If the terms were not favorable the employees could have made relatively little. You'll note that some other people in this thread are assuming various liquidation preferences just to validate their priors (employees always get screwed) with no real evidence to support their claims.
One way to look at it however is to consider the question "What is Walmart buying in this deal?" From my perspective they're not really buying a pile of code or a customer base or a brand name (none of that seems this valuable). What they are really buying is an energized and engaged team working until the leadership of a reportedly excellent CEO. They hope that this team will do a lot to help Walmart to capture a larger share of the future of e-commerce (where Amazon is clearly kicking their ass at the moment). So if a lot of the asset Walmart is buying is the people then it would't be an effective purchase if most of those people got screwed as part of the sale. This is just speculation on my part but I think it makes logical sense.
If the terms were favorable (standard preferred stock) the employees likely made several billion dollars (in aggregate) on the deal. If the terms were not favorable the employees could have made relatively little. You'll note that some other people in this thread are assuming various liquidation preferences just to validate their priors (employees always get screwed) with no real evidence to support their claims.
One way to look at it however is to consider the question "What is Walmart buying in this deal?" From my perspective they're not really buying a pile of code or a customer base or a brand name (none of that seems this valuable). What they are really buying is an energized and engaged team working until the leadership of a reportedly excellent CEO. They hope that this team will do a lot to help Walmart to capture a larger share of the future of e-commerce (where Amazon is clearly kicking their ass at the moment). So if a lot of the asset Walmart is buying is the people then it would't be an effective purchase if most of those people got screwed as part of the sale. This is just speculation on my part but I think it makes logical sense.