X is the symbol used in mathematics to mean "multiplied by", but colloquially in English we say "times". 5x2=10 (Five times Two equals Ten) So he's just saying he has been the featured analyst five times.

thanks, Dominic~

You should read it as "5 time" even though it says "5x". It means he was the featured/best analyst at the meeting 5 times. If it's an adjective then 5x is 5 time but if it's a noun then 5x is 5 times