On March 2, shares in the company closed at 6.4 cents before it plunged to 3.9 cents as at 10.15am on March 3.
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The unusual movement triggered a query from the Singapore Exchange Regulation (SGX RegCo) at 10.30am, the third in the past two months.
SGX RegCo has asked Oceanus to reveal any information that may be material and price-sensitive, and that it is compliant with the listing rules.
As at 11.17am, shares in Oceanus fell further, 2.3 cents lower or 35.9% down, at 4.1 cents.
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See also: Oceanus triggers second SGX query in a month as share price goes past 7 cents and Oceanus receives market regulator's query after over 8% share price surge