The companies range from consumer giants like Proctor and Gamble and Coca-Cola to supermarkets including Asda and Marks and Spencer. And they've come together with government, trade associations and campaigners to form what's called a Plastics Pact.
It's a series of pledges meant to tackle plastic pollution over the next seven years. For example, to improve designs to make recycling easier - many products are currently made with a mix of different types of plastic. Also to cut out unnecessary single-use packaging and to include more recycled plastic in new products.
The move has been welcomed by environmental groups, who've long-argued that pollution can never be reduced until products are designed with recycling in mind. But Friends of the Earth says government measures are also needed to make sure the targets are met.