Active Quote by Bill Ackman
“As a result of overdiversification, their (active managers) returns get watered down. Diversification covers up ignorance. Active managers haven't done enough research into any of their companies. If managers have 200 positions, do you think they know what's going on at any one of those companies at this moment?”
About This Quote
Source Speech: Investor Conference, Bill Ackman, 2023
Overdiversification dilutes manager performance because they cannot adequately research many holdings, leading to generic returns.
In simple terms: Too many holdings limit deep analysis, hurting returns.
Key Takeaway
Focus on fewer, well‑researched investments.
Themes
investment
analysis
performance
risk
concentration
Mood
critical
analytical
skeptical
Type
advisory
critical
analytical
When to use this quote
- asset allocation
- fund selection
- due diligence
- risk management
Key Concepts
portfolio theory
managerial oversight
information asymmetry
Questions to Reflect On
- How many positions can you realistically monitor?
- What criteria would you use to trim a portfolio?
A Different Perspective
Limited resources mean managers cannot truly understand every holding.
