Your Vote Matters

Vote FOR the U. S. Steel Board of Directors that continue to deliver extraordinary value and act in your best interest

Your Board Recommends You Vote Using the WHITE Proxy Card or WHITE Voting Instruction Form Provided by Management To:

VOTE FOR

U. S. Steel’s independent, highly qualified director nominees

WITHHOLD YOUR VOTE FOR

Ancora’s unqualified nominees

Your vote is extremely important, no matter how many shares you own.

Your Board recommends you vote using the [WHITE] proxy card or [WHITE] voting instruction form provided by management to vote:

FOR

U. S. Steel’s independent, highly-qualified director nominees

AGAINST

Ancora’s nominees

Voting Methods

To submit your vote, you must first locate your WHITE proxy card or WHITE voting instruction form. Once you have located your WHITE proxy card or WHITE voting instruction form, simply follow one of the three easy ways to vote below:

Internet*

Go to the website listed on your proxy or voting instructions form.

Telephone (IVR System)*

Call the applicable number listed on your proxy or voting instruction form.

Mail

Return the proxy or voting instruction form in the enclosed envelope.

* When using the internet or the telephone to vote, shareholders should use the control number located on their proxy or voting instruction form.

You may receive solicitation materials from Ancora, including an opposition proxy statement and gold proxy card. The Board does not endorse Ancora’s nominees and unanimously recommends shareholders discard any proxy materials from Ancora.

If you have already submitted a gold proxy card, you can revoke such proxy and vote for the Company’s director nominees on the WHITE proxy card. Only your latest validly executed proxy will count and any proxy may be revoked at any time prior to the 2025 Annual Meeting as described in the accompanying proxy statement.

If you have any questions or require any assistance with voting your shares, please contact Innisfree M&A Incorporated, U. S. Steel’s proxy solicitor, at 888-750-5884 (toll-free from the U.S. and Canada) or +1-412-232-3651 (from other countries).