When insiders buy, they're putting real money where their mouth is—it's the ultimate vote of confidence. SoFi CEO Anthony Noto just did exactly that, which just sent a pretty clear signal about his outlook on the company.

Here's the thing: insider selling happens for all sorts of reasons—personal cash needs, diversification, tax planning. But buying? That's different. Executives only open their wallets when they genuinely believe the stock is headed higher.

Noto's recent purchase adds weight to the bullish case for SOFI (NASDAQ). It's not a guarantee, but when the person running the show is betting their own capital on the company, retail investors should at least take notice.

The question isn't whether Noto knows something the market doesn't—it's whether the market has already priced in SoFi's growth potential. His actions suggest there's still room to run.