Susicious trades of Dow Jones & Co. stock just prior to the announcement of News Corp.’s offer to purchase are under investigation by the New York attorney general and the Securities and Exchange Commission. Dow Jones received an unsolicited offer to be acquired about two weeks ago. Over 10,000 Dow Jones call options were traded in late April, compared to a total of about 7,000 in the entire first quarter of the year. On Tuesday, shares of Dow Jones went from $36.33 to $56.20, which would give traders of calls huge profits.