Should I drop relevant high school internships from resume before applying to investment banking?

I did an equity research internship with a small company throughout high school. It technically just started as a finance internship and I offered to work for free. It eventually turned into an equity research internship since the owner thought I could handle more than just getting him coffee. Obviously, the internship isn't like a full-on summer equity research analyst position at a well-known firm or anything. I mostly did valuation comps, built financial models, analyzed financial statements, etc., etc. Since it was a high school internship, the company never invested real money based on anything I did and it was mostly just a really good learning experience for me. Should I remove it from my resume now that I'm in college or keep it since it's somewhat relevant?