Williams, Williams Partners and Access Midstream Partners to Report Year-End 2014 Financial Results on Feb. 18

Williams (NYSE: WMB), Williams Partners L.P. (NYSE: WPZ) and Access Midstream Partners, L.P. (NYSE: ACMP) plan to jointly host a Q&A live webcast on Thursday, Feb. 19, at 9:30 a.m. EST following the announcement of their year-end 2014 financial results after the market closes on Wednesday, Feb. 18.

The combined investor call reflects Williams’ acquisition of controlling interests in Access Midstream Partners on July 1, 2014. Executive management from Williams will participate in the call.

A limited number of phone lines will be available at (800) 768-6570. International callers should dial (785) 830-1942. A link to the webcast, as well as replays of the webcast in both streaming and downloadable podcast formats, will be available for two weeks following the event at www.williams.com.

About Williams, Williams Partners and Access Midstream Partners

Headquartered in Tulsa, Okla., Williams is one of the leading energy infrastructure companies in North America. It owns controlling interests in both Williams Partners L.P. and Access Midstream Partners, L.P. through its 100-percent ownership of the general partner of each partnership. Additionally, Williams owns approximately 66 percent and 50 percent of the limited partner units of Williams Partners L.P. and Access Midstream Partners, L.P., respectively.

Williams Partners owns and operates both on-shore and offshore assets of approximately 15,000 miles of natural gas gathering and transmission pipelines, 1,800 miles of NGL transportation pipelines, an additional 11,000 miles of oil and gas gathering pipelines and numerous other energy infrastructure assets. Williams Partners’ operated facilities have daily gas gathering capacity of approximately 11 billion cubic feet, processing capacity of approximately 7 billion cubic feet, NGL production of more than 400,000 barrels per day and domestic olefins production capacity of 1.95 billion pounds of ethylene and 90 million pounds of propylene per year.

Access Midstream Partners owns and operates natural gas midstream assets across nine states, with an average net throughput of approximately 4.13 billion cubic feet per day and more than 6,773 miles of natural gas gathering pipelines. ACMP’s operations are focused on the Barnett, Eagle Ford, Haynesville, Marcellus, Niobrara and Utica Shales and the Mid-Continent region of the U.S.

For more information about Williams, Williams Partners and Access Midstream Partners, visit the Investor Center at www.williams.com.

Portions of this document may constitute “forward-looking statements” as defined by federal law. Although the company believes any such statements are based on reasonable assumptions, there is no assurance that actual outcomes will not be materially different. Any such statements are made in reliance on the “safe harbor” protections provided under the Private Securities Reform Act of 1995. Additional information about issues that could lead to material changes in performance is contained in the company’s annual reports filed with the Securities and Exchange Commission.