The other international issues are Brazilian state oil company Petroleo Brasileiro (in six funds) and Canadian oil-and-gas finder Encana (five).

FORBES: Picks of the Pros

According to the ETF Finder at ETF Channel, DO makes up 5.71% of the Oil Services HOLDRS ETF ( AMEX: OIH) which is trading relatively unchanged on the day Monday.

FORBES: DO Crosses Critical Technical Indicator

According to the ETF Finder at ETF Channel, SLB makes up 18.78% of the Oil Services ETF ( AMEX: OIH )which is trading lower by about 4.8% on the day Monday.

FORBES: Connect