Internship Experience on Resume private information?

I did a 3 month M&A internship at a mid-market bank. There were many deals going on, but none of them have been made public yet / closed. I am having a hard time putting this experience on my resume. So far I have mentioned generics bullet points:

• Helped prepare pitch books for client presentations, including but not limited to company profiles, shareholder information and comparable analysis • Developed company-specific and general industry research/analysis • Researched potential investors, buyers and acquisition targets

I helped a little bit with a model here and there and did very specific things for certain deals, but I am not sure how to mention the latter as this information is still private for ongoing deals and will remain private for potential deals that eventually did not close.

For obvious reasons: I do not wanna mention anything private nor do I wanna mention anything that shows which deals the bank worked on but eventually they did not get.

Does anyone have some tips?

Thank you.