He works in marketing of a program to deal in shares

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Check below answers in case you are looking for other related questions:
Ruling on selling clothes when one does not know whether they will be used in halaal ways or haraam
Making a program which will be used for halaal and haraam

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Related Answers:
Selling video tapes and keeping a TV and VCR
It is not permissible to sell gold for money unless the full price is paid in the same sitting
Bay’ al-Wafaa’
Ruling on selling clothes when one does not know whether they will be used in halaal ways or haraam
Making a program which will be used for halaal and haraam

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