| Net sales | 21,818.8b | 22,385.2b | 21,420.1b |
| Cost of goods sold (excluding depreciation and amortization) | -17,106.2b | -17,541.5b | -16,758.8b |
| Selling, general and administrative expenses | -3,306.2b | -3,256b | -3,044.2b |
| Depreciation and amortization | -183.2b | -181.3b | -179b |
| Income from operations | 1,223.2b | 1,406.4b | 1,438.1b |
| Interest expense, net | -364.9b | -389.3b | -294.4b |
| Other (income) expense, net | -92.7b | 25.1b | 7b |
| Income before income taxes | 951b | 992b | 1,136.7b |
| Provision for income taxes | -231.6b | -225.9b | -274.5b |
| Net income | 719.4b | 766.1b | 862.1b |
| Less: Net income attributable to noncontrolling interests | 1.8b | 0.6b | 1.7b |
| Net income attributable to WESCO International, Inc. | 717.6b | 765.5b | 860.5b |
| Less: Preferred stock dividends | 57.4b | 57.4b | 57.4b |
| Net income attributable to common stockholders | 660.2b | 708.1b | 803.1b |