We almost always hear about how Lynch achieved a 29% annual return over 13 years, but almost never about how that performance was bifurcated - incredible in the first half when AUM was low and more modest in the second half when it was high.
To outperform dramatically, you need to concentrate the portfolio.
It’s hard to outperform when you are managing 1,000 stocks.
In 1977, Peter Lynch took over the Magellan Fund. In Lynch's first year the fund had 41 stocks and 343% turnover. By 1983, the portfolio expanded to 900 stocks, and by 1989 hit 1,400 stocks. AUM climbed from $20 million to $14 billion.