The companies are seeking to strike deals with Kenya and the rest of Africa
The PM is set to meet President Uhuru Kenyatta at State House where they'll discuss issues on trade, security and a joint fight against corruption.
She will also visit British troops in the country and a business school before concluding the trip with a State dinner hosted by Mr Kenyatta.
Mrs May is accompanied by a host of business moguls and firms keen to strike deals with Kenya and the rest of Africa.
Here are some of those who are part of her entourage:
London Stock Exchange (LSE)
LSE is one of the world's oldest exchanges in the world. It is located in the City of London, England.
As of April 2018, the exchange had a market capitalisation of US$4.59 trillion.
Standard Chartered PLC
Standard Chartered PLC is a British multinational banking and financial services company headquartered in London, England.
It operates a network of more than 1,200 branches and outlets across more than 70 countries.
It had a market capitalisation of approximately £24.4 billion as of 4 April 2017.
Sure Chill
Sure Chill is a cooling technology which is currently being used in medical refrigerators, but has wider potential in the future for domestic refrigerators and beverage coolers.
Clarke Energy
A privately owned multinational company specialising in the sale, engineering, installation and maintenance of power plants that use gas engines.
Azuri Technologies
Azuri Ltd. develops, manufactures, and installs solar power products for off-grid emerging markets in Africa and the United Kingdom.
Mabey Bridge
Mabey is a world leader in temporary and permanent bridge construction and bridge installation.
Farm.ink
A firm that builds mobile solutions for small-scale farmers in Africa.