The parties announced their full merger on 22 September 2011.
"It is just a matter of weeks before they announce a merger," a person close to the company said.
The two leagues announced a merger on June 8, 1966, to take full effect in 1970.
They announced a merger that would be the biggest in any industry to date.
The two airlines announced their proposed merger on May 19.
The savings banks announced their merger on July 9, 1986, for $40 a share, or a total of about $5 million.
The two struggling retailers announced a merger late last year, although the deal has yet to close.
But the operators of two disparate Web sites for women recently announced a merger.
Before announcing a merger, he said, company leaders usually ensure that they have support from board members and Wall Street.
Since the companies announced their merger, shares of both drugmakers have fallen.