Exhibit 21
List of Subsidiaries of Olympic Steel, Inc.
| Name of Subsidiary | State of Organization | % Ownership |
| Olympic Steel Lafayette, Inc. | Ohio | 100% |
| Olympic Steel Minneapolis, Inc. | Minnesota | 100% |
| Olympic Steel Iowa, Inc | Iowa | 100% (a) |
| Oly Steel NC, Inc. | Delaware | 100% |
| Tinsley Group – PS&W, Inc. | North Carolina | 100% (b) |
| IS Acquisition, Inc. | Ohio | 100% |
| Olympic Steel Trading, Inc. | Ohio | 100% |
| Chicago Tube and Iron Company | Delaware | 100% |
| Metales De Olympic, S. de R. L. de C.V. | Mexico | 100% (c) |
| B Metals, Inc. | Ohio | 100% |
| MCI, Inc. | Ohio | 100% |
| ACT Acquisition, Inc. | Texas | 100% |
| SHAQ, Inc. | Georgia | 100% |
| OS Holdings, Inc. | Ohio | 100% |
| Metal-Fab, Inc. | Kansas | 100% |
| Central Tube and Bar, Inc. | Arkansas | 100% (d) |
| Metal W, Inc. | Georgia | 100% (d) |
|
(a) |
Owned 100% by Olympic Steel Minneapolis, Inc. |
|
(b) |
Owned 100% by Oly Steel NC, Inc. |
|
(c) |
Owned 100% by Olympic Steel Trading, Inc. |
| (d) | Owned 100% by OS Holdings, Inc. |