"Capping the value at...." would mean that they're assessing the shares at that value (or no greater than that value). These are NON-assessable shares.
I think perhaps you could check with your broker concerning a correct understanding of that term, "non-assessable shares"... which are... "like most other shares traded on U.S. and most other major exchanges in the world."
Non-assessable simply means the shares trade freely, based on what people are willing to pay for them, or sell them for... they are not subject to a fixed assessment value. They are... NON ASSESSABLE.
News 
Market Data 
Discover 
