10. Conoco
Background: Oil and gasoline company Conoco originally went to market in October 1998, after its previous parent, DuPont, the chemicals giant, decided to spin it off. The IPO raised $4.4 billion.

Conoco merged with Phillips Petroleum in 2002. The larger energy corporation is called ConocoPhillips ( COP).

Stock performance: Shares of ConocoPhillips are down 29.27% this year. The stock is up 1.42% at $51.54 Monday.

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