Cool, thanks! I use Stocks on a variety of platforms and never seem to scroll down far enough to see the ad, so I had to check to see why my experience was vastly different. I'm in the same boat as you without News+.
You don't have to scroll very far at all, there's an ad in between every block of news stories in Stocks, you only have to scroll once on any stock or the first news tab - https://i.imgur.com/ICX0w0I.png - this is just a tiny bit of scrolling on the APPL stock.