Trading in shares of the oil and gas exploration company Anadarko Petroleum late this spring are under investigation by the Securities and Exchange Commission, according to someone familiar with the matter.

Crisis in the Gulf

The SEC is examining trading of Anadarko shares with an eye toward any trades that might have been motivated by market participants with non-public information, this person said. Anadarko owns a stake in the Macondo well in the deep waters of the Gulf of Mexico, which began leaking oil on April 20 after a disastrous rig fire broke out.