Passive Investing
Investment strategy that tracks market indices rather than making active stock selection, now representing over 50% of global AUM and causing significant market distortions
Passive Investing
Definition
Passive investing is an investment strategy that tracks a market index (such as the S&P 500 or FTSE 100), aiming to match its performance rather than outperform it. Unlike active management, passive funds do not select stocks based on fundamentals, valuation, or quality assessment. As of 2023, passive funds represent over 50% of global assets under management.
The Paradox of "Passive" Investing
Terry Smith at Fundsmith's 2025 AGM offered a counter-intuitive perspective:
"Index investing is only passive in that there's no fund manager involved — it's actually a momentum-based strategy. Money going into index funds is allocated based on market weight, meaning the biggest companies get most of the inflows, boosting their share prices further."
Market Distortion Evidence
Concentration in S&P 500
In 2024, just five technology companies ("Fab Five") contributed 44% of the S&P 500's total return. Nvidia alone contributed 21%.
This concentration means:
- If you don't own these companies in roughly their index proportion, you underperform
- Even owning them at slightly different weights creates significant tracking error
Global Phenomenon
This isn't just an American phenomenon:
"In the German DAX, SAP contributed 41% of the index return. Apart from the top few companies, all others combined contributed only 2% of returns."
This means: if you didn't hold SAP, you couldn't outperform the German DAX.
The Flow Problem
Smith emphasized that the problem isn't just the percentage of assets in passive funds, but the flow between active and passive:
"When you move money from active funds holding Nvidia to index funds with high Nvidia exposure, Nvidia's stock price rises."
John Bogle's Warning
John Bogle, the godfather of index investing, warned in 2017:
"If index funds reach a certain proportion of total assets under management, will they distort markets? — Yes, inevitably."
By 2023, over 50% of global assets were in passive funds — surpassing Bogle's uncertain threshold.
Active vs. Passive: Is the Game Over?
Betteridge's Law
Betteridge's Law states that any headline ending in a question mark can be answered with "no."
Smith applied this to the question: "Has active management come to an end?"
"Active management is going through a difficult time for specific reasons, but any active manager worth their salt dreams of being the last one standing when all other money is invested without consideration of quality or valuation."
The Challenge
"The challenge is surviving long enough to reap those benefits."
Many investors deemed "wrong" by the market ultimately proved correct — but didn't survive to enjoy the victory. Tony Dye ("Doomster") was fired just before the internet bubble burst on the very day of his dismissal.
Quality vs. Passive: A Fundamental Tension
Passive investing allocates capital without consideration of:
- Quality — Return on capital, margins, competitive advantages
- Valuation — Price paid relative to fundamentals
- Business economics — Long-term sustainability
Active quality investors like Terry Smith argue that these factors matter for long-term returns, and ignoring them creates both misallocation and market distortion.
Related Concepts
- momentum-strategy — The implicit strategy within passive investing
- quality-investing — What passive ignores
- active-investing — The alternative approach
Related People
- terry-smith — Critic of passive investing distortions
- john-bogle — Father of index investing who warned of the consequences
Famous Quotes
"Show me the incentive and I'll show you the outcome." — Charlie Munger (on why passive flows to the largest companies)
"Any active manager worth their salt dreams of being the last one standing." — Terry Smith