What are the top 3 insulin companies?

I'm curious to know, which are the leading three insulin companies in the industry today? It's important to stay informed about the market leaders in this crucial sector, especially given the growing prevalence of diabetes and the increasing demand for insulin products. I'm eager to learn about their market share, reputation, and any innovative products they may have developed. Could you please provide me with a brief overview of these top three insulin companies and their key strengths?