Company: ZEUS
Filing Date: 2025-10-30
Form Type: 425
Source: 0001193125-25-257069
Chunk: 162

Company: OLYMPIC STEEL INC
Filing Date: 2025-10-30
Form: 425
Chunk 162
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 shall be deemed to have been disclosed in or with respect to such other section, notwithstanding the omission of an
appropriate cross-reference to such other section or the omission of a reference in the particular

107

representation and warranty to such section of the Disclosure Schedules, (d) except as provided in above, headings have been inserted in the Disclosure Schedules for
convenience of reference only, (e) the Disclosure Schedules are qualified in their entirety by reference to specific provisions of this Agreement (f) the Disclosure Schedules and the information and statements contained therein are not
intended to constitute, and shall not be construed as constituting, representations or warranties of the Parties except as and to the extent provided in this Agreement, and (g) in disclosing such information, the disclosing Party does not
waive, and expressly reserves any rights under, any attorney-client privilege associated with such information or any protection afforded by the work-product doctrine with respect to any of the matters disclosed or discussed therein.

[Remainder of page intentionally left blank.]

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IN WITNESS WHEREOF, each of the Parties hereto has caused this Agreement to be executed as of the date first written above by their respective officers thereunto duly authorized.

| OLYMPIC STEEL, INC.              |     |                         |
| By:                              |     | /s/ Richard T. Marabito |
| Name:  Richard T. Marabito       |     |                         |
| Title:   Chief Executive Officer |     |                         |

[ Signature Page to Agreement and Plan of Merger]

| RYERSON HOLDING CORPORATION                    |     |                   |
| By:                                            |     | /s/ Edward Lehner |
| Name:  Edward Lehner                           |     |                   |
| Title:   President and Chief Executive Officer |     |                   |

[ Signature Page to Agreement and Plan of Merger]

| CRIMSON MS CORP.                               |     |                   |
| By:                                            |     | /s/ Edward Lehner |
| Name:  Edward Lehner                           |     |                   |
| Title:   President and Chief Executive Officer |     |                   |

[ Signature Page to Agreement and Plan of Merger]

Exhibit 10.1 OLYMPIC STEEL, INC. October 28, 2025 BY ELECTRONIC MAIL Michael D. Siegal:

| Re