Article content Singapore-listed conglomerate Keppel Corp and rig builder Sembcorp Marine on Thursday requested the stock exchange in separate filings that their shares be placed on trading halts pending announcements. Keppel and Sembcorp Marine were among the world’s biggest oil rig-builders, but a prolonged drop in oil prices and an oversupply of rigs have hit their businesses hard for several years. We apologize, but this video has failed to load. Try refreshing your browser, or Singapore's Keppel, Sembcorp Marine request trading halts Back to video Singapore state investor Temasek Holdings, which is the biggest shareholder in both companies, had scrapped its plans last year to take majority stake in Keppel, following the company’s poor financial results.