SGX RegCo had also asked the group to release any potential information that may have prompted the surge.
Shares in Yangzijiang have been rising steadily since Sept 8, when the group announced that it had obtained a technology membrane license from French naval engineering company GTT.
The receipt of the license was deemed as a “major breakthrough” by DBS Group Research, paving the way for Yangzijiang’s entry into the liquefied natural gas (LNG) carrier market.
Yangzijiang is the first non-state-owned enterprise (SOE) Chinese shipyard to obtain a license from GTT.
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As at 4.12pm, shares in Yangzijiang are trading 14 cents higher or 12.7% up at $1.24.
/Update
In its response to the query after market hours, Yangzijiang Shipbuilding has clarified that it is unaware of any information that might explain the trading today. That said, the group noted its announcement on its GTT license on Sept 8, adding that the group "did not provide any comments" in the media reports that covered the event.