What does this mean?

Cleveland   Sat Jul 14, 2007 1:18 pm GMT
I was reading financial times and a sentence was:

Singapore Airlines is exploring options to sell all or part of its 49 per cent stake in Virgin Atlantic to..............

what does stake mean here? equivalent of stock?
Cleveland   Sat Jul 14, 2007 1:27 pm GMT
and this as well

An upgrade from HSBC helped Swedish truckmaker Volvo buck a sharply lower European market

what does "An upgrade" and "buck" mean here?
Uriel   Sun Jul 15, 2007 8:24 pm GMT
I suspect the upgrade in question here refers to a credit rating given by some sort of oversight board; a better credit rating would make a company look far more appealing to investors.
Decade Trader   Sun Jul 15, 2007 9:52 pm GMT
It could also be that HSBC (apparently a big Chinese/British bank), gives stock ratings. Perhaps Volvo stock was upgraded from "sell" to "hold", "hold" to "buy", "dump" to "sell", "underweight" to "overweight", etc.

I suspect, on the day/week/etc. in question, the European stock averages were sharply lower, but Volvo stock went up because of the upgrade.