The investigation covers a period of years during which certain current and previous staff at Takara Printing used confidential information provided by its customers to give them an advantage trading stock.
The company prepares and prints financial statements for nearly 2,000 companies, including annual reports and reports of shareholder meetings.
At least three people are suspected of having used information on companies' takeover bids to buy stock in the target company ahead of formal announcements.
The investigation, which began last summer, found that one former staff had made multiple millions of yen from the practice while working at the company.
The original Daily Yomiuri Online story can be read here.
Have your say in the Printweek Poll
Related stories
Latest comments
"And here's me thinking they bought the Docklands Light Railway."
"15 x members? Why don't they throw their lot in with the Strategic Mailing Partnership (SMP) and get a louder voice?"
"Some forty plus years ago I was at a "sales" training seminar and got chatting to the trainer after the session had finished.
In that conversation he told me about another seminar he had..."
Up next...
Further breathing space
'Serious group' interested in Highcon, new deadline set
Automation welcomed
Colourbridge enhances efficiency with new Duplo multi-finisher
New business unit includes OpSec
