In 1977, Lynch was named head of the then-obscure Magellan Fund which had $18 million in assets. By the time Lynch resigned as a fund manager in 1990, the fund had grown to more than $14 billion in assets with more than 1,000 individual stock positions. Taking over when Magellan was a small fund, Lynch had no restrictions on what assets he could buy (other than laws, such as an SEC-enforced federal law that prohibits investment company funds that are registered as "diversified" from holding more than 5% of total portfolio assets in a single company at time of purchase ). He focused on individual companies rather than any overarching strategy, starting with large US companies and gradually shifting emphasis to smaller and international stocks.
From 1977 until 1990, the Magellan fund averaged a 29.2% annual return and as of 2003 had the best 20-year return of any mutual fund ever. Lynch achieved dollar successes in a range of stocks including (by order of profit achieved - source is Beating the Street): Fannie Mae, Ford, Philip Morris, MCI, Volvo, General Electric, General Public Utilities, Student Loan Marketing, Kemper, and Lowe's.