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SUPPLEMENT TO PROXY STATEMENT DATED MARCH 20, 2024 FOR THE ANNUAL MEETING

OF STOCKHOLDERS TO BE HELD ON APRIL 30, 2024.

April 10, 2024

Dear Stockholders:

Glass Lewis recently issued its proxy paper research report evaluating the composition of the Board of Directors of The Williams Companies, Inc. (the “Williams Board”). Accordingly, The Williams Companies, Inc. (“Williams”) is providing its stockholders with the following additional information.

The Williams Board is comprised of 12 directors all of whom, other than Williams’ Chief Executive Officer, are independent. Of those 12 directors, the Williams Board currently has three (3) female directors representing 25% of its total board composition. Two (2) of those female directors chair committees of the Williams Board (i.e., Stacey Doré is Chair of the Governance and Sustainability Committee and Rose Robeson is Chair of the Audit Committee). In addition, at least two (2) women have served on the Williams Board since 2004 and, with the exception of two election cycles, three (3) women have served on the Williams Board since 2006. Former Williams Board director Kathleen Cooper was also the first female Chairman of the Williams Board serving in that role from 2016 - 2017.

In the Spring of 2023, the Governance and Sustainability Committee (the “Committee”) launched an effort to identify other highly qualified female director candidates with energy industry experience. Adding one additional female director would increase the female representation on the Williams Board to over 30%. By July 2023, the Committee had identified and reviewed several female executives’ professional backgrounds with two candidates being of heightened interest. Although the Williams Board only needs one additional female director to achieve the 30% threshold of female directors, if more than one outstanding female candidate is identified during the candidate search process, the Williams Board has a history of seizing the opportunity to appoint more than one woman from a single candidate search process. This is how current directors Stacey Doré and Rose Robeson both came to be appointed, in December 2020 and January 2021 respectively, to the Williams Board.

The Committee further evaluated, interviewed and by late October 2023, Williams was in the process of finalizing the independence and conflicts check on a particular director candidate. That candidate, who had indicated she was prepared to join the Williams Board, is an active executive officer with significant energy experience. However, in mid-November 2023, immediately prior to the Committee making its recommendation to the Williams Board to appoint such candidate, she unexpectedly withdrew from the process. The candidate advised Williams that her current employer had an internal policy, with which she was previously unfamiliar, which prevented her from serving on the Williams Board.

However, Williams’ director candidate process continued. By late November 2023, the Committee had identified and engaged with another female director candidate. This candidate also had significant energy industry experience and had confirmed her willingness to serve on the Williams Board. However, in January 2024, immediately prior to the Committee recommending that the Williams Board appoint such director candidate, she contacted Williams advising that she had just discovered a health issue which necessitated her withdrawing from Williams’ director candidate process.

To sum up, on two separate occasions, spanning 2023 and 2024, the Williams Board took action to appoint an additional well-qualified female director, and it is not unreasonable to think the Williams Board may have appointed both as directors. However, for reasons unforeseeable by the Williams Board, and at a late stage in Williams’ director candidate process, each of the female director candidates withdrew.