What visa options are available for foreigners looking to invest in a business in Thailand?

Depends on your nationality. Americans get preferential treatment because of Treaty obligations

Ask Tesco why they pulled out of Thailand

Try to consult to this agency they help me to get my smart visa and set up my foreign owned company.. I highly recommend them

Hi Ana this is a big question as visas for people to do business is one thing and setting up companies with the proper permissions and in this proper corporate format is entirely predicated upon the type of business you want to be in, what kind of investment you've got and whether you want to go with a BOI, a treaty of Amity or a Private limited company where you have minority shares in the company. I I'm a business advisor helping people set up the right type of company and permissions in Thailand. If you want to discuss in detail I'd be happy to get on a call with you

Foreigners who wish to conduct business or undertake investment activities in Thailand must apply for a non-immigrant visa “B” at the Royal Thai Embassy or Royal Thai Consulate-General in their home/residence country or at the designated Royal Thai Embassy or Royal Thai Consulate-General.