Sentence:  Let's say you <WSD>went long</WSD> with 100 shares of Computer Devices stock at its peak, $16.62. What then cost you $1,662 you could now sell for about $50, which would just about cover commissions. 
Meaning of the word marked with <WSD> tags:  To buy a financial product with the intention of holding it for sufficient time for it to increase in value and thus to be sold for a profit.