What companies sell helium?

I'm curious, could you please elaborate on which companies are currently in the market selling helium? Are there any major players or are there a variety of smaller firms offering this commodity? I'm particularly interested in knowing if there are any specialized companies that focus solely on helium production and distribution, or if it's a sideline product for larger industrial conglomerates. Additionally, I'd like to understand if there are any geographical trends in helium production and sales, such as certain regions being more prevalent in this industry. Thank you for your insight.