Company: ZEUS
Filing Date: 2025-10-30
Form Type: 425
Source: 0001437749-25-032438
Chunk: 0

Company: OLYMPIC STEEL INC
Filing Date: 2025-10-30
Form: 425
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
<div align='center'>Washington, D.C. 20549

FORM 8-K

CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of Earliest Event Reported): October 28, 2025

OLYMPIC STEEL, INC.

(Exact Name of Registrant as Specified in its Charter)</div>

| Ohio                            |     | 000-23320               |     | 34-1245650                       |
| (State or Other Jurisdiction of 
 Incorporation)                  |     | -Commission File Number |     | -IRS Employer Identification No. |

| 22901 Millcreek Boulevard, Suite 650     
 Highland Hills, Ohio                     |     44112 |
| (Address of Principal Executive Offices) | -Zip Code |

<div align='center'>(216) 292-3800

(Registrant’s Telephone Number, Including Area Code)

_______________________________________________________________________

(Former name or former address, if changed since last report)</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

<div align='center'>Securities registered pursuant to Section 12(b) of the Act:</div>

| Title of each class             | Trading Symbol | Name of each exchange on which registered |
| Common Stock, without par value | ZEUS           | The NASDAQ Stock Market LLC               |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company �