The marketing technology landscape is constantly evolving, but some of the biggest Martech companies include:

Salesforce: A leader in customer relationship management (CRM) technology, offering a wide range of marketing, sales, and customer service solutions.

Adobe: A provider of creative and digital marketing solutions, including the popular Creative Cloud suite of products.

Hubspot: A provider of inbound marketing, sales, and customer service software, as well as a range of marketing and sales tools.

Marketo: A provider of marketing automation software that helps businesses to automate and streamline their marketing efforts.

Oracle: A provider of marketing and advertising technology, including marketing automation and data management solutions.

Pardot: A B2B marketing automation solution, now part of Salesforce.

Google: A provider of digital marketing tools and services, including

Google Ads and Google Analytics.

Moz: A provider of SEO and content marketing tools, including a suite of SEO and analytics tools.

SEMrush: A provider of digital marketing tools, including SEO, PPC, content, and social media marketing tools.

Act-On: A provider of marketing automation and account-based marketing solutions.

This list is not exhaustive, as the Martech landscape is constantly changing and new companies are entering the market all the time. These companies are among the biggest and most well-known providers of marketing technology solutions, but the best Martech solution for a particular business will depend on its specific needs and requirements.