Company: ZEUS
Filing Date: 2025-10-30
Form Type: 425
Source: 0001193125-25-257069
Chunk: 13

Company: OLYMPIC STEEL INC
Filing Date: 2025-10-30
Form: 425
Chunk 13
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 and other documents filed with the SEC by Ryerson may be obtained free of charge by directing a request by mail to Ryerson’s
Corporate Secretary at Ryerson Holding Corporation, Attention: Secretary, 227 W. Monroe St., 27th Floor, Chicago, Illinois, 60606. Copies of the registration statement and joint proxy statement/prospectus (if and when available) and other documents
filed with the SEC by Olympic may be obtained free of charge by directing a request by mail to Olympic’s Chief Financial Officer at Olympic Steel, Inc., 22901 Millcreek Boulevard, Suite 650, Highland Hills, OH, Attention: Chief Financial
Officer.

PARTICIPANTS IN THE SOLICITATION

Olympic,
Ryerson and their respective directors and executive officers may be deemed to be participants in any solicitation of proxies in connection with the proposed transaction. Information about Olympic’s directors and executive officers is
available in Olympic’s proxy statement dated March 28, 2025 for its 2025 Annual Meeting of Shareholders. Information about Ryerson’s directors and executive officers is available in Ryerson’s proxy statement dated
March 5, 2025, for its 2025 Annual Meeting of Stockholders. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in
the registration statement on Form S-4, including the joint proxy statement/prospectus, and all other relevant materials to be filed with the SEC regarding the proposed transaction when they become available.
Investors should read the registration statement on Form S-4, including the joint proxy statement/prospectus carefully when it becomes available before making any voting or investment decisions.

| Item 9.01 | Financial Statements and Exhibits. |

(d) Exhibits

| Exhibit 
 No.     
 2.1*    
 10.1    |     | Description                                                                                                                                     
 Agreement and Plan of Merger, dated as of October 28, 2025, by and among Ryerson Holding Corporation, Crimson MS Corp., and Olympic Steel, Inc. 
 Letter Agreement, dated as of October 28, 2025, by and among Ryerson Holding Corporation, Olympic Steel, Inc. and Michael Siegal.               |
|:--------|:----|:------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.2    |     | Letter Agreement, dated as of October 28, 2025, by and among Ryerson Holding Corporation