If anyone has experience with growth shares in the US, would love to hear about it. It's a UK construct to allow for participation in gains above a hurdle value, often set near the current valuation. Similar to options but doesn't require the cash outlay and should (in theory) be an attractive tax construct.

https://www.twobirds.com/~/media/pdfs/expertise/employment/e...

Summary table towards the end of the article if you're looking for a "quick glance" version.