I just went there and the first "result" is a giant stock chart widget showing the 1-day chart with the options of viewing 5-day, month, etc. This chart takes up a full 1/3 of the vertical screen size. At the bottom of the chart there's 3 quick-links to: Google Finance, Yahoo finance, and MSN Money. The next result-ish thing is Google's "In the News" section that has an article about the broken Gigafactory promises. The first real result is yahoo finance, just as it is for you. I suspect it isn't so much that Google is promoting Yahoo over its own product, since that first chart is clearly a Google product, but that it doesn't bias the real search results in their favor. It's a legitimate organic search result. Most people probably just want the stock price from the first/simplest way possible, which is provided or they want the yahoo finance page.