The document lists 19 B2B companies that purchase ads for their own branded keywords on Google, including Salesforce, Dropbox, PayPal, and HubSpot. It explains that companies buy their own branded keywords for several reasons: to control the landing page, test different offers, and prevent competitors from capturing potential leads. The full list of companies highlighted includes Salesforce, Dropbox, PayPal, Blackbaud, Tableau, Zenefits, Zoho, HubSpot, Marketo, Rackspace, Google, TeamViewer, GoToWebinar, Slack, Cloudera, MongoDB, WeWork, Regus, Uber, Lyft, DocuSign, Evernote, and SurveyMonkey.