Shares of Williams Cos. fell nearly 5 percent Monday after multiple headlines.
The energy company may have issues closing its planned merger with Energy Transfer Equity because of a disagreement on the impact of tax issues on the deal.
Energy Transfer shares climbed more than 12 percent after an S-4/A filing with the Securities and Exchange Commission said that law firm Latham & Watkins told Energy Transfer that "it would not be able to deliver the 721 Opinion" that would make the deal tax-free for investors. Such filings contain data related to a merger or acquisition. The company's stock later gave up some of those gains and closed up 2.6 percent.
The filing indicates that Williams disagrees with this position.