Hydrogenics Corp. (Toronto, Canada), a designer and manufacturer of fuel cell technology, registered 12.65 million common shares in a registration statement filed with the US Securities and Exchange Commission. The company did not specify how many shares it plans to offer or how many shares will be allotted to underwriters - Citigroup, National Bank Financial and TD Securities USA Inc. - in the event of heavy demand. The company said it may use the proceeds for general corporate purposes, capital spending and investments.