(Bloomberg) -- A group of companies controlled by an influential member of Abu Dhabi’s royal family have shed $30 billion in market value this year, contributing to a drop in the emirate’s benchmark index that’s lagged regional peers.Most Read from BloombergSingapore Minister Faces Most Serious Graft Probe Since 1986DeSantis Says No Thanks to $377 Million in US Energy FundsFund Titans Are Betting on Everything Gaining Against the DollarNATO Is Papering Over the Cracks After Zelenskiy Loses His C