Ackman's investment philosophy has evolved over 20 years to emphasize long-term business quality and durable growth, while maintaining an activist approach. He now focuses on being a constructive, supportive shareholder on boards, helping companies resist short-term market pressures. Regarding AI, Ackman compares the current boom to the 2000 dot-com bubble, warning that niche software companies face disruption while platform companies like Microsoft are more defensible. He explains his public market calls using the 'rubber band effect' on valuation pullbacks, noting high-quality companies are currently extremely cheap. Ackman advocates for founder-led companies, citing their greater authority and long-term incentives for bold decisions. His strategy for building a Berkshire-like entity involves combining insurance float with investment talent, using Howard Hughes as a vehicle, following Buffett's model of investing float in short-term treasuries and surplus in common stocks.