According to Mooreast, Siu quit for "personal reason".
"There are no concerns with regards to financial reporting" and that there are no disagreements between Siu and the board "with regards to practices that would have an impact to the company's financial reporting", the company says.
Siu's last known role, as disclosed by the company, was the financial controller of Biolidics, another SGX-listed company, between June 2022 and May 2024.
He was previously with other listed companies such as Mary Chia Holdingsand EuroSports Global, holding similar roles.
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Mooreast is looking for alternative funding after an earlier $20.1 million convertible loan provider did not pay up the deposit on time.
Mooreast shares last traded at 11 cents.