TSX Market Making Program Guide Responsibilities of Market Makers TMX Group Page 19 Metric MM Measurement Measurement Description Weighting in Contribution Score For example: o Target TOB Size = 5000, and TOB Size not provided by MMs (“natural liquidity”) = 3000. TOB Size Deficit = 2000. o Scenario 1: MM1 contributes 1,500 shares and has a TOB Size Contribution of 1,500. MM2 contributes 2,500 shares, capped at the maximum 2,000 shares, so MM2 has a TOB Size Contribution of 2000. MM1 Relative TOB Contribution % = 43% (1500 / (1500 + 2000)) and MM2 Relative TOB Contribution % = 57% (2000 / (1500 + 2000)) o Scenario 2: MM1 contributes 3,000 shares and MM2 contributes 2,500 shares. Both have a TOB Size Contribution capped at the maximum 2,000 shares, so therefore MM1’s Relative TOB Size Contribution % = 50% vs MM2 Relative TOB Size Contribution = 50% Where the TOB Size Deficit is less than 10 board lots, both MMs are assessed at an equal 50% contribution.