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At 0345 GMT, STX OSV shares retreated 7.1 percent in Singapore, while Seoul-listed STX Corp and STX Pan Ocean were down 6.2 percent and 8.5 percent, respectively. "People are wondering if they need more money to pay their debt," said a Singapore analyst, who declined to be identified. "It's not just STX OSV because its sister company STX Pan Ocean is also down, so it could be a group issue." An STX OSV spokesperson said the company does not comment on market speculation.