SELLING SHAREHOLDERS As indicated in the table below, prior to the Offering, the Selling Shareholders own or control, directly or indirectly 24,776,536 Common Shares representing 100% of the issued and outstanding Common Shares. The Selling Shareholders will sell or cause to be sold pursuant to the Secondary Offering an aggregate of 7,494,994 Common Shares representing 23.22% of the outstanding Common Shares. After giving effect to the Offering (but without giving effect to the Over- Allotment Option), the Selling Shareholders will own or control, directly or indirectly, an aggregate of 17,254,876 Common Shares, representing approximately 53.45% of the outstanding Common Shares. The following table describes the shareholdings of the Selling Shareholders prior to and after the Offering: Before Giving Effect to the Offering A fter Giving Effect to the Offering % of Common Shares Outstanding No. of Common (Assuming no Shares Sold No. of Common exercise of (Assuming no Shares R emaining Over-Allotment exercise of (Assuming no exercise Option/ Over-Allotment of Over-Allotment Assuming % of Option/Assuming Option/Assuming Exercise in Indirect or No. of Common Exercise in F ull of Exercise in F ull of F ull of Direct Common Shares Over-Allotment Over-Allotment Over-Allotment Name Ownership Shares Outstanding Option) Option) Option) (7) 1684182 International (1)(2) . Direct 6,804,791 27.46% 2,825,805/3,483,809 3,978,986/3,320,982 12.33%/10.13% 1684182 Ontario (1)(2)(3) . . . Direct 2,586,759 10.44% 1,074,195/1,324,327 1,512,564/1,262,432 4.69%/3.85% 96052 Canada Inc. (2)(4) . . . Indirect 1,465,964 5.92% 608,766/750,521 857,198/715,443 2.66%/2.18% Monique Harvey (2) ..... Indirect 488,655 1.97% 202,922/250,173 285,733/238,482 0.89%/0.73% Johann Duval (2) ....... Indirect 651,539 2.63% 270,563/333,565 380,976/317,974 1.18%/0.97% Fiducie F amille Michel Mathieu (2) ......... Indirect 393,269 1.59% 163,312/201,340 229,957/191,929 0.71%/0.59% P ascal Simard (2) ....... Indirect 131,090 0.53% 54,437/67,113 76,653/63,977 0.24%/0.20% Gesco (2)(5) ........... Direct 12,027,933 48.55% 2,257,482/2,783,150 9,770,451/9,244,783 30.27%/28.20% Daniel R o y (2)(6) ........ Direct 109,870 0.44% 20,621/25,423 89,249/84,447 0.28%/0.26% Sylvain L aroche (2)(6) ..... Indirect 40,000 0.16% 7,507/19,255 32,493/30,745 0.10%/0.09% R obert Brouillette (2)(6) . . . Indirect 20,000 0.08% 3,754/9,628 16,246/15,372 0.05%/0.05% R enaud Mercier (2)(6) .... Indirect 15,000 0.06% 2,815/7,220 12,185/11,530 0.04%/0.04% R aymond L eclerc (2)(6) .... Indirect 15,000 0.06% 2,815/7,220 12,185/11,530 0.04%/0.04% T otal: .............. 24,749,870 99.9% 7,494,994/9,262,744 (7) 17,254,876/15,509,626 53.45%/47.31% Notes: (1) 1684181 Management is the general partner of 1684182 Ontario and 1684182 International and is owned by two private equity inves tors, Signal Hill Equity P artners Inc. and Ironbridge Equity P artners Limited. ( 2 ) On April 4, 2007, Sylvain L aroche acquired 40,000 Common Shares, R obert Brouillette acquired 20,000 Common Shares, R enaud Merci er acquired 15,000 Common Shares and R aymond L eclerc acquired 15,000 Common Shares, each at a price of $1.00 per Common Share. On April 16, 2007, 1681482 acquired 117,611 Common Shares, 1684182 International acquired 264,939 Common Shares, 96052 Canada Inc. acquired 59,714 Common Shares, Monique Harvey acquired 19,905 Common Shares, Johann Duval acquired 26,539 Common Shares, Fiducie F amille Michel Mathieu acquired 16,019 Common Shares, P ascal Simard acquired 5,340 Common Shares and Gesco acquired 489,933 Common Shares, as consideration for the acquisition of Drift based on a value of $1.00 per Common Share. On May 31, 2007, Daniel R oy acquired 109,870 Common Shares in consideration for the acquisition of Soudure R oyale based on a value of $1.50 per Common S hare. All other Common Shares were acquired on January 31, 2007 pursuant to the amalgamation of Orbit Garant. (3) 1684182 Ontario has certain voting rights in respect of an additional 3,233,850 Common Shares (owned of record by 96052 Cana da Inc., Monique Harvey, Johann Duval, Fiducie F amille Michel Matheiu, P ascal Simard, Sylvain L aroche, R obert Brouillette, R enaud Mercie r, R aymond L eclerc and Alain L aplante) pursuant to a voting trust agreement that will be terminated on completion of this Offering . (4) 96052 Canada Inc. is controlled by Michel Mathieu. (5) Gesco is owned as to approximately 90% by P ierre Alexandre. Eric Alexandre also owns approximately 5% of the shares in this company. 63