As I posted here and here Corticeira Amorim produces cork products including wine cork stoppers, cork flooring, insulation, and other cork products. While Corticeira is a hidden champion this doesn't mean that they have a monopoly on the cork market, one company they share the wine stopper market with is Oeneo.
A bit of background, Oeneo considers itself a wine products company with a division in the corking business, different than Corticeira who considers themselves a cork company. Either way I think the comparison is fair.
I like doing comparisons like this and probably don't do them often enough but they highlight important differences. The biggest item that stands out to me is that Oeneo has a 7.21% profit margin vs the 4.5% margin of Corticeira. On the other hand Corticeira appears more undervalued with a lower P/E and lower P/B.
The question an investor needs to ask themselves before investing in corks or wine making is would they rather pay more for a company with higher margins or a less profitably company that is selling at a cheaper price? Or to flip it around, does a 7.2% profit margin vs a 4.5% profit margin justify an almost double P/E?
Disclosure: Long Corticeira Amorim