Bill Ackman – Startup Investor Profile

Bill Ackman is known for focusing on operational improvements as an activist investor. He avoids excessive diversification, learns from mistakes, ignores short-term market turbulence, and adopts a long-term approach. Ackman has a concentrated portfolio with just seven stocks, including Alphabet, Chipotle Mexican Grill, Howard Hughes, and Restaurant Brands International. His investment style involves making concentrated bets in consumer-facing stocks with competitive advantages. Ackman has an impressive track record as an activist investor, pushing for positive change in targeted companies. His investments have included successful bets like shorting Herbalife and betting on the S&P 500 to fall during the pandemic. Ackman’s investment check size has been significant, with his largest-ever ‘blank check’ company, Pershing Square Tontine Holdings Ltd., raising over $4 billion. In partnership and collaboration, Ackman has collaborated with companies like Valeant for strategic acquisitions, indicating a bidder-activist collaboration model.

Location: Parsippany, NJ

Country: United States of America

Investment Regions:

Investment Stages: pre-seed, seed

Website:

AI Reasoning: I found a May 5, 2025 investment where Pershing Square (Bill Ackman) invested $900 million to acquire nine million newly issued shares of Howard Hughes Holdings – the startup/company invested is Howard Hughes. The time since that investment to the reference date is less than 6 months, so classify as very-active.

Low Activity – Only known angel investments more than 12 months ago.

Active – Known angel investments between the last 12 and 6 months.

Very Active – Known angel investments in the last 6 months.