| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 30 | AAward | 10 | $0.00 | — | 48,634 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVPDERIV | Sep 9 | MOption exercise | 10,308 | $0.00 | —? | 0derivatives |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVPDERIV | Sep 9 | MOption exercise | 21,645 | $0.00 | —? | 0derivatives |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 11 | S | 13,780 | $219.59 | $3.0M | 48,625 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | FTax withholding | 3,331 | $212.64 | $708K | 62,405 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | DReturned to issuer | 2,649 | $212.64 | $563K | 65,736 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | MOption exercise | 10,308 | $54.64 | $563K | 68,385 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | FTax withholding | 7,274 | $212.64 | $1.5M | 58,077 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | DReturned to issuer | 4,919 | $212.64 | $1.0M | 65,351 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Sep 9 | MOption exercise | 21,645 | $48.32 | $1.0M | 70,270 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVPDERIV | Aug 13 | MOption exercise | 16,305 | $0.00 | —? | 0derivatives |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVPDERIV | Aug 13 | MOption exercise | 12,107 | $0.00 | —? | 0derivatives |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 14 | S | 5,600 | $211.52 | $1.2M | 48,625 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 14 | S | 5,493 | $210.29 | $1.2M | 54,225 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | FTax withholding | 5,024 | $215.42 | $1.1M | 59,718 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | DReturned to issuer | 4,754 | $215.42 | $1.0M | 64,742 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | MOption exercise | 16,305 | $62.80 | $1.0M | 69,496 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | FTax withholding | 3,514 | $215.42 | $757K | 53,191 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | DReturned to issuer | 4,027 | $215.42 | $867K | 56,705 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Aug 13 | MOption exercise | 12,107 | $71.65 | $867K | 60,732 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Jun 30 | AAward | 11 | $0.00 | — | 48,625 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Mar 31 | AAward | 13 | $0.00 | — | 48,614 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVPDERIV | Mar 1 | AAward | 4,896 | $0.00 | —? | 4,896derivatives |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Mar 1 | AAward | 2,078 | $0.00 | — | 48,601 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Mar 1 | FTax withholding | 336 | $180.47 | $61K | 46,523 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Feb 17 | FTax withholding | 350 | $196.85 | $69K | 46,859 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Feb 16 | FTax withholding | 272 | $196.85 | $54K | 47,209 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Feb 13 | FTax withholding | 2,289 | $193.67 | $443K | 47,481 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Feb 13 | AAward | 5,217 | $0.00 | — | 49,770 |
| WESCO INTERNATIONAL INC | WCC | Nelson John Squires IIIEVP | Dec 31 | AAward | 10 | $0.00 | — | 44,553 |