Insiders at artificial intelligence chipmaker Nvidia have dumped more than $1 billion in stock over the last year, according to a Financial Times report. About half of those sales occurred during the last month as the market notched new highs and shook off geopolitical tensions.

Nvidia insiders sold over $1 billion worth of company stock in the past year, with a notable uptick in recent trading activity as execs capitalize on surging investor interest in AI.

According to Ernst & Young, the average U.S. S&P 500 company has a lifespan of just 15 years because of technological disruption and failure to adapt to changing conditions. Many others experience long periods of stagnation, even if they survive.