Our best source of information for this topic would be a database called Eikon, which is only accessible through an in-person or virtual machine reservation of a particular terminal in the Research Commons. Within the Eikon database there is a 'Deal Screener' tool wherein you can specify:
Asset Class = 'Equity'
Issue Type = 'Follow-on'
You'll likely need to specify further filters as you can only screen for up to 15,000 results at a time. Please reach out to the Business & Economics Librarian if you would like assistance exploring the database or doing further research.