The CEO and Executive Director of Wizz Air, József Váradi, made the biggest insider sale of over £2m worth of shares in the past 12 months, despite the share price being lower than the current value. Insider transactions are significant in long-term investments as insiders hold a degree of clout and knowledge that can be translated to investors. While insider selling can suggest the shares are undervalued, it does not necessarily mean that they believe that prices will fall further, but it is an indication of their valuation. However, insider ownership of Wizz Air Holdings is at 2.2% of the company with a total value of £60m, creating reasonable alignment. Regardless, it is important to understand the risks facing the company. While insider transactions can help in forming an investment thesis, they are not the only factors and risks must be assessed before investment decisions are made.