SINGAPORE, July 10 (Reuters) - Shares in Myanmar-focused conglomerate Yoma Strategic Holdings fell nearly 17% in Singapore on Wednesday after the company said Executive Chairman Serge Pun was cooperating with authorities in the capital Naypyitaw on bank business matters.

"There are no charges filed against him," the company said in a statement, adding that Pun had been meeting with authorities including the central bank.

"As a responsible business organization in Myanmar, the group engages with the relevant government ministries and regulators from time to time."

Pun is a property tycoon whose interests have expanded into financial services, food and auto sales.

Yoma stock dropped as much as 21.5% in early trade and was last down 16.7% at S$0.1319 ($0.098), its lowest for two weeks.

($1 = 1.3496 Singapore dollars) (Reporting by Tom Westbrook; Editing by Tom Hogue)