The FTSE 100 energy giants BP (LSE: BP) and Shell (LSE: RDSB) are among the largest companies in the world, but the forthcoming flotation of Saudi Aramco — expected to list in London — could make them look like minnows.

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Owain Bennallack owns shares of BP and Royal Dutch Shell B. The Motley Fool UK has recommended BP and Royal Dutch Shell B. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.