Hi Andrew,
Welcome to T2W.
If you're trading actual shares via a direct access broker such as IB (as opposed to a derivative product such as Contracts for Difference or options), then yes - it will. Furthermore, you'll need to fund your account with a minimum of USD $25k. Realistically, I recommend you make this nearer $30k to give yourself a little breathing space. Drop just one cent below the $25k minimum and they'll lock your account. (No prizes for guessing how I know that!)
Having said all of that, I'm basing this on my experiences back in 2008 when I day traded US equities. Rules n' regs may have changed since then, so check with your prospective broker for all the latest info'.
Tim.