List Previously Held Roles on Resume

I will be an SA at a well-respected bank this summer and plan on recruiting full time. Although my GPA is not steller (3.5), I have quite strong internship experience. As I will adding some transaction experience to my CV this summer, my one-page resume is getting cramped.

I am wondering if it is common or acceptable to include positions held my freshman school year and freshman summer as:

Previous positions held:
[name of position] at [name of company] [time period]
[name of position] at [name of company] [time period]

The two roles are not directly IB related: one is accounting and the other is sales. In my mind, including them like this (1) shows I was starting doing "real" internships and work early in my collegiate career and (2) helps paint a more complete picture of what has led me to IB.

I know I could reduce the descriptive bullet points, but any line I add under those roles, takes away a line I could include about the IB, PE, or VC internships I've held.

Thank you to anyone who cares to input their 2 cents.