NovoCure (NVCR) shares are soaring 6.18% in Thursday's trading session, building on the pre-market momentum sparked by news of a significant insider stock purchase. The company's Chief Financial Officer, Christoph Brackmann, has made a substantial investment in NovoCure stock, triggering a wave of investor optimism and driving the share price higher.

Insider buying, particularly by high-ranking executives such as CFOs, is often viewed as a bullish signal by market participants. Such purchases suggest that those with intimate knowledge of the company's operations and financial health believe the stock is undervalued or poised for growth. Brackmann's decision to invest his own money in NovoCure shares is being interpreted as a strong vote of confidence in the company's future prospects.

While the exact details of Brackmann's purchase have not been disclosed, the market's robust positive reaction indicates that investors are aligning their positions with the CFO's apparent optimism. This surge in NovoCure's stock price demonstrates the significant impact that insider transactions can have on market sentiment, especially for companies in the innovative medical technology sector. As the trading session progresses, market observers will be closely watching to see if this momentum sustains and whether it leads to increased analyst attention or potential upgrades for NovoCure.