The companies' statement put the value of the deal at $5.6 billion, but it wasn't clear if that figure also included the assumption of debt, and the companies didn't provide a breakdown of how they arrived at that figure. Dow Jones' most recent financial filing shows it has 83.8 million shares outstanding, valuing the company at $5 billion at Murdoch's price of $60 per share.

Murdoch has said he would invest in the Journal's Washington bureau and digital operations and expand its domestic readership, taking on the two other national US newspapers, The New York Times and Gannett Co.'s USA Today. He has also said he would expand the Journal's presence overseas, where it would go up against other business publications including Pearson PLC's Financial Times.

Murdoch also plans to launch a business-themed cable news channel in the United States later this year to rival General Electric Co.'s highly profitable CNBC network. Murdoch hopes Dow Jones' news resources and brand name help jump-start that channel, but he would have to negotiate out of a deal CNBC has to use Dow Jones news through 2012.

Over the years, the Bancrofts' ties to Dow Jones have become more remote, and none of them work in the company's day-to-day affairs. Spread out across the country, the family's three dozen adults include a former airline pilot, investment bankers and philanthropists.

The Bancrofts long considered themselves stewards of a great American journalistic institution, but they also had differences over the future direction of the company. A decade ago, two younger family members publicly agitated for change at Dow Jones and were sidelined.

The Bancrofts had angered Dow Jones shareholders in 2005 when the company passed provisions that would allow the Bancrofts to maintain their voting control even if they reduced their ownership stake.

Dow Jones, like several other newspaper companies, is controlled by a family through a special class of shares with powerful voting rights. Despite owning just 25 percent of the company, the Bancrofts exercise 64 percent of the shareholder vote through the more powerful Class B shares, which aren't traded publicly.

Long though to be an insulation against outside pressure or unexpected takeover offers, the two-class share structure didn't prove to be an impediment to Murdoch, who knew of the family's persistent unrest with Dow Jones' lagging share price.

Even though it was a pioneer in providing financial news and data, Dow Jones has fallen behind rivals such as Reuters Group PLC and Bloomberg LP in the business of providing real-time financial information. Its venture into the data delivery business, Telerate, turned into a bust, and it sold the business in 1998 for $510 million after paying $1.6 billion for it a decade earlier.

A union representing Journal reporters and other Dow Jones employees has objected to Murdoch's bid, saying he would downgrade the quality of the paper's coverage and tilt its stories to suit his business interests. Former board member James Ottaway Jr. also opposed ownership by Murdoch.

Murdoch countered with a promise not to interfere with the paper's newsroom and has agreed to set up a five-member board, whose initial members would be jointly chosen by both News Corp. and Dow Jones, with the power to approve the hiring or fire top editorial officials.

In a letter to readers published in Wednesday editions, Journal publisher Gordon Crovitz sought to allay concerns about the transition.

"Readers can rely on this: The same standards of accuracy, fairness and authority will apply to this publication, regardless of ownership," Crovitz wrote, adding later on: "My colleagues and I hope that as part of a larger company we can extend our journalism more broadly, to serve more readers better."

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