Which company has the best growth in affiliate marketing?

Some of the largest affiliate marketing networks with many advertisers and publishers include:

1. Amazon Associates: Amazon's affiliate program is one of the most popular and largest in the world, with millions of products available to promote.
2. Commission Junction: Commission Junction is a popular affiliate network that connects advertisers with publishers and provides advanced tracking and reporting features.
3. Rakuten Marketing: Rakuten Marketing is a global affiliate marketing network that provides access to over 1,000 advertisers and offers advanced technology and reporting features.
4. ShareASale: ShareASale is an affiliate marketing network that provides access to over 4,500 advertisers in a variety of niches and industries.
5. Awin: Awin is a global affiliate marketing network that connects advertisers with publishers and provides access to over 13,000 advertisers in various industries.

It's worth noting that the success of affiliate marketing programs can depend on various factors, such as the advertiser's products, commission rates, and the publisher's audience and promotion strategies.