^^^ I struggled with that too, Brainiac. As the question is worded though ("lost most value", rather than "lost the biggest proportion of its value"), I think that my answer above is correct.
However if JohnC1 wants the percentage figures for the share prices of Peloton, Uber and Lyft, respectively, they're -22%, -40% and -54%.
It's also not clear at what point the market value should assessed. I've assumed at the lowest point post-IPO but the question might refer to the biggest loss on, say, the opening day of trading.