Rental car company Avis has identified a hedge fund firm's trading activity as a significant factor contributing to the recent "excess volatility" in its stock. Wall Street Journal (Markets) posted on X that Avis has been experiencing fluctuations in its stock price, which the company attributes to the trading patterns of this particular hedge fund. Avis has not disclosed the name of the hedge fund involved but emphasized the impact of its trading on the stock's performance. The company is closely monitoring the situation as it continues to assess the implications of such trading activities on its market stability.