A US regulator said traders at Well Advantage Limited made more than $7m (£4.5m) in illegal profits.
It said traders had prior information of a deal between Chinese state-owned oil firm CNOOC and Canadian Nexen.
Assets of the traders have been frozen.
Last week CNOOC, China's biggest offshore oil producer, said it had offered $15.1bn to acquire rival Nexen.
The US Securities and Exchange Commission said traders at Well Advantage Limited, and other "unknown traders", had stockpiled shares of Nexen, which is listed in the US, in the days before the public announcement.
After the deal was made public, shares in Nexen rose nearly 52%.
The SEC said traders at Well Advantage bought more than 830,000 shares of Nexen on 19 July and made a trading profit of more than $7m.
Other "unknown traders" made similar purchases through accounts in Singapore of more than 676,000 Nexen shares before the announcement. It said they sold nearly all the stock after the deal was public, resulting in a profit of $6m.
"Well Advantage and these other traders engaged in an all-too-familiar pattern of misusing inside information to place extremely timely trades and profit handsomely from their illegal acts," said Sanjay Wadhwa, Deputy Chief of the SEC Enforcement Division's Market Abuse Unit.
Well Advantage is not a publicly listed company and could not be reached for comment.
However, China Rongsheng Heavy is listed in Hong Kong, and on Monday it tried to limit the damage from the probe.
In a statement to the Hong Kong stock exchange China Rongsheng Heavy said Mr Zhang was not involved in the running of the company.
"Mr Zhang does not have any executive role in the company. The day-to-day business activities and operation of the group is and will continue to be carried out by the management team, of which Mr Zhang is not a member."
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