The Company computes basic EPS by dividing Net income (loss) attributable to SiteOne by the weighted average number of common shares outstanding for the period. The Company includes vested RSUs, DSUs, and PSUs that have not been settled in common shares in the basic weighted average number of common shares calculation. The Company’s computation of diluted EPS reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock, which include in-the-money outstanding stock options and RSUs. PSUs are excluded from the calculation of potential dilutive common shares until the performance conditions have been achieved on the basis of the assumption that the end of the reporting period was the end of the contingency period, if such issuable shares are dilutive. Using the treasury stock method, the effect of dilutive securities includes the additional shares of common stock that would have been outstanding based on the assumption that these potentially dilutive securities had been issued. The treasury stock method assumes proceeds from the exercise price of stock options and the unamortized compensation expense of RSUs and stock options are used to repurchase common shares at the average market price during the period, thus reducing the dilutive effect. RSUs and stock options with assumed proceeds per unit above the Company’s average share price for the periods presented are excluded from the diluted EPS calculation because the effect is anti-dilutive.


	Three Months Ended		Nine Months Ended
	September 27, 2026	September 28, 2025	September 27, 2026	September 28, 2025
Shares used in the computation of basic earnings per share	43,653,283	44,802,833	44,130,009	44,901,813
Effect of dilutive securities:
Stock options	63,225	171,602	102,787	233,439
RSUs and PSUs	87,875	44,501	75,621	24,708
DSUs	12,739	16,306	14,675	14,694
Shares used in the computation of diluted earnings per share	43,817,122	45,035,242	44,323,092	45,174,654

The diluted earnings per common share calculation for the three months ended September 27, 2026 and September 28, 2025 excluded the effect of 514,657 and 168,405 potential shares of common stock, respectively, because the assumed exercises of a portion of the Company’s employee stock options and RSUs were anti-dilutive. In addition, the diluted earnings per common share calculation for the nine months ended September 27, 2026 and September 28, 2025 excluded the anti-dilutive effect of 504,308 and 173,761 potential shares of common stock, respectively.