I would not ask for a raise right now. How I would phrase this is is more like : "I do believe I'm worth more, and assuming everything goes well, in the long te

I would not ask for a raise right now. How I would phrase this is is more like : "I do believe I'm worth more, and assuming everything goes well, in the long term, I would like to be payed more/get part of the business". This way, if/when they succeed, you'll succeed too.