Harry Potter and the Magical Profit Margins Under the Treebr Gerrick Johnson, a toy analyst at BMO Capital Markets, named both Legobr and Thomas & Friends, the maker of toy trains for little kids, which he said also had an operating profit margin in excess of 30 percent.br Brand Finance, a brand consulting company based in London, pointed to Lego, putting its operating marginsbr at 34 percent over the last half-decade, compared with 14 percent for Hasbro and 13 percent for Mattel.