To: All Persons or Entities who purchased Williams Partners L.P. (“Williams Partners” or the “Company”) (NYSE: WPZ) stock prior to May 17, 2018. You are hereby notified that Levi & Korsinsky, LLP has commenced an investigation into the fairness of the Williams merger. Williams Partners will be sold to Williams (NYSE: WMB). Under the terms of the transaction, Williams Partners shareholders will receive 1.494 common shares of Williams for each Williams Partners public unit they own. The transaction is valued at $10.5 billion. To learn more about the WPZ merger and your rights, go to: http://www.zlk.com/mna/williams-partners-l-p or contact Joseph E. Levi, Esq. either via email at jlevi@levikorsinsky.com or by telephone at (212) 363-7500, toll-free: (877) 363-5972. There is no cost or obligation to you.

The Williams investigation concerns whether the Board of Williams Partners breached their fiduciary duties to stockholders by failing to adequately shop the Company before agreeing to enter into this transaction, and whether Williams is underpaying for Williams Partners shares, thus unlawfully harming Williams Partners shareholders.

Levi & Korsinsky is a national firm with offices in New York, Connecticut, California, and Washington D.C. The firm’s attorneys have extensive expertise in prosecuting securities litigation involving financial fraud, representing investors throughout the nation in securities lawsuits and have recovered hundreds of millions of dollars for aggrieved shareholders. For more information, please feel free to contact any of the attorneys listed below. Attorney advertising. Prior results do not guarantee similar outcomes.