Bill Ackman, founder of Pershing Square Capital Management, stated his concern that the stock market has returned to a "casino" mode, with increased speculative trading and up to 95% leverage in the system leading to significant stock price volatility. He believes this situation is not beneficial for the economy or society, despite his fund having capitalized on it to buy stocks like Microsoft, Amazon, and Google at low prices. Ackman is particularly bullish on companies such as Visa, Mastercard, and Netflix.