Fundamental Index Contratrading
Rebalance toward economic weight instead of chasing market prices
- Difficulty
- Moderate
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 98%
Fundamental indexing breaks the link between a security's price and its portfolio weight. Instead of allowing rising prices to produce ever-larger allocations, it estimates each company's economic footprint using measures such as sales, profits, book value, and dividends. Current holdings are then rebalanced toward those non-price targets. A stock whose price rises faster than its fundamentals is trimmed, while one whose price falls relative to its fundamentals is increased. This creates a structural sell-high, buy-low process and a persistent value tilt without requiring forecasts of fair value. Because trades run against popular market flows and are distributed across many companies, the approach can also retain substantial capacity and relatively low implementation costs.
Origin
Rob Arnott and Research Affiliates developed the fundamental index from 2003 to 2004, launched live assets in 2004, and published the first FTSE index in 2005.
Core principles
- 01Separate a company's economic footprint from its market price
- 02Treat extreme price moves as opportunities to rebalance
- 03Trim appreciated positions and restore discounted positions
- 04Spread trading across a broad universe
- 05Let disciplined rebalancing replace discretionary market timing
How to run it
- 1
Measure economic footprint
Select stable non-price measures such as sales, profits, book value, and dividends. Combine them to estimate each company's share of the underlying economy.
Pro tip Use multiple fundamentals so that one temporarily distorted accounting measure does not dominate.
Watch out Do not use current market capitalization in the target-weight calculation.
- 2
Set target weights
Convert each company's economic footprint into a portfolio target weight. This creates an anchor independent of market enthusiasm or fear.
Pro tip Document the formula before observing subsequent returns.
Watch out Repeatedly changing the formula can turn a systematic strategy into disguised performance chasing.
- 3
Compare price and target weights
Identify securities whose market-driven portfolio weights have moved above or below their fundamental targets.
Pro tip Review the dispersion across the whole portfolio rather than making isolated stock judgments.
Watch out A large discount can reflect genuine distress, so maintain broad diversification.
- 4
Contratrade toward the anchor
Sell part of positions whose prices have risen above their economic weights and buy positions whose prices have fallen below them.
Pro tip Trade patiently because the strategy is normally selling what others want to buy and buying what others want to sell.
Watch out Contrarian trades can continue losing before mean reversion appears.
- 5
Rebalance systematically
Rebalance annually or move a fraction of the way toward target each quarter. Keep the schedule consistent through uncomfortable markets.
Pro tip Quarterly staggered rebalancing can preserve some momentum while maintaining the contrarian anchor.
Watch out Do not abandon the process solely because popular growth stocks are temporarily outperforming.
In the wild
A technology holding doubles while its sales, profits, book value, and dividends barely change. A capitalization-weighted portfolio automatically gives it more influence, but the fundamental index trims it back toward its unchanged economic footprint and reallocates the proceeds to discounted holdings.
→ The portfolio realizes part of the gain and reduces exposure to valuation mean reversion.
Rather than restoring every holding to target at once, a portfolio moves one fourth of the way toward its fundamental weights each quarter. Three fourths of the portfolio temporarily retains market momentum while the rebalanced portion reinstates valuation discipline.
→ The portfolio preserves low annual turnover while applying the contrarian process throughout the year.
Common mistakes
Anchoring on capitalization weights
Starting from market capitalization preserves the tendency to overweight securities whose prices already embed the greatest optimism.
Chasing recently successful metrics
Dynamically favoring whichever fundamental measure recently performed best can select the measure whose valuation has become most stretched.
Abandoning the strategy during pain
The expected premium depends partly on investors finding contrarian positions uncomfortable, so quitting after underperformance can crystallize the disadvantage.
Is it for you?
Best for
It is best for long-horizon investors seeking systematic value exposure without selecting individual winners.
Not ideal for
It is not ideal for investors who cannot tolerate prolonged periods of contrarian underperformance.
From the transcript
“Smart beta originally meant strategies that break the link with price, that don't pay any attention to market capitalization or a price in setting the…”
“It's built in structural cell high Bilow discipline.”
“We're selling what people want to buy, We're buying what people want to sell.”
From the episode
Robert Arnott Discusses the Process Behind Research Affiliates
Robert Arnott