Peter Lynch
Manager of Fidelity's Magellan Fund from 1977 to 1990 — roughly 29% annualized over 13 years — and the great democratizer of stock research for ordinary investors.
Who he is
Peter Lynch took over Fidelity's Magellan Fund in 1977 with $18 million in assets and retired in 1990 with $14 billion, compounding at roughly 29% per year. He then wrote "One Up on Wall Street" and "Beating the Street", arguing that observant amateurs can spot great companies in daily life before Wall Street notices.
His genius was breadth and shoe leather: he famously visited hundreds of companies a year and held more stocks than almost any manager, yet his core ideas are radically simple.
Core philosophy
"Invest in what you know" is the famous half; the forgotten half is "…and then do the homework." Noticing a crowded store is a lead, not a thesis — Lynch insisted on checking earnings, balance sheets, and the story behind the numbers before buying anything.
He categorized stocks into six types — slow growers, stalwarts, fast growers, cyclicals, turnarounds, and asset plays — each demanding different expectations and different reasons to sell. He also popularized the PEG ratio: a P/E should be judged relative to the company's growth rate.
Key lessons for individual investors
- Know what you own, and know why you own it — in language a child could follow.
- Your everyday edge is real: customers, employees, and industry insiders often see inflection points before analysts.
- The "story" must be checkable in numbers; a narrative without earnings is a rumor.
- Far more money has been lost preparing for corrections than in the corrections themselves.
- Behind every stock is a company. Find out what it is doing — the stock eventually follows the earnings.
Peter Lynch strategy — how he picked 10-baggers
Lynch coined the word "tenbagger" for a stock that returns ten times your money, and his strategy for finding them was deliberately unglamorous: notice excellent products in everyday life, classify the company correctly, check that earnings growth is real, and make sure the price hasn't already discounted the story. His favorite shortcut was the PEG ratio — a P/E below the earnings growth rate suggested you weren't overpaying for growth.
Central to the strategy is his six-category system. The category determines what you should expect from a stock and when to sell it — treating a cyclical like a fast grower is how investors get hurt.
| Category | What it is | Lynch's play |
|---|---|---|
| Fast growers | 20–25%+ earnings growth, small & aggressive | The land of tenbaggers — hold while growth lasts |
| Stalwarts | Large, steady compounders (10–12% growth) | Buy on dips, rotate after 30–50% gains |
| Slow growers | Mature, dividend-paying giants | Mostly avoid — little upside |
| Cyclicals | Autos, airlines, chemicals | Timing the cycle matters more than the company |
| Turnarounds | Battered companies that can recover | Highest risk, fastest payoff — e.g. Chrysler 1982 |
| Asset plays | Hidden assets the market ignores | Patience until value is recognized |
Framework from One Up on Wall Street (1989). Historical examples for education — not stock recommendations.
The 10-bagger checklist Lynch actually used
- Invest in what you know — your job and your mall visits are research edges.
- PEG under 1: the P/E ratio should not exceed the earnings growth rate.
- Strong balance sheet: avoid heavy debt, prefer net cash.
- A boring name or a dull industry is a bonus — fewer competing buyers.
- Insiders buying and the company buying back shares are healthy signs.
- Know your story in two minutes: why you own it, what must go right.
Case deep-dive I: Chrysler, 1982 — a turnaround everyone could see
In 1982 Chrysler was a national joke: fresh off a government loan guarantee, bleeding cash, with the stock around $2 and bankruptcy taken for granted. Lynch did what he always did — he visited. At headquarters he toured the upcoming model line and saw the first minivan; he checked the balance sheet and found over $1 billion of cash from asset sales, buying the company more time than the market assumed.
He made Chrysler Magellan's largest position — at points over 5% of an enormous fund. As the economy recovered and the minivan became the most profitable vehicle category in America, the stock rose more than tenfold in five years.
Lynch's point in retelling it: nothing in the thesis required inside information. The cash was in the filings, the minivan was at the auto show, and the pessimism was on every front page.
| Stage | What he did | Repeatable action |
|---|---|---|
| Signal | A $2 stock, national pessimism — and a new model line at the auto show | Front-page pessimism is where research starts, never where it ends |
| Verify | Balance sheet: $1B+ cash after the loan guarantee; site visit: saw the minivan first-hand | Verify on two legs — the cash runway and the product pipeline |
| Size | Made it Magellan's largest position, at points over 5% of a huge fund | Once a turnaround is verified, the weighting must match the conviction |
| Exit & result | 10×+ in five years; handled as a completed turnaround | Sell by category logic: when the turnaround is delivered, re-rate it |
Case deep-dive II: Hanes, 1970s — the tenbagger in a grocery cart
Lynch's wife Carolyn came home from the supermarket praising L'eggs — pantyhose of decent quality sold on a spinner rack at the checkout, the first serious hosiery distribution outside department stores. Women visited supermarkets roughly twelve times more often than department stores; the product met them where they already were.
Lynch verified the thesis like an analyst, not a romantic: he confirmed repeat-purchase rates, checked that a rival's knockoff ("No Nonsense") wasn't denting share, and established that Hanes still had years of runway. Magellan's stake rose roughly sixfold before Sara Lee acquired the company.
The case became his most quoted parable — and his most misquoted. "Buy what you know" was never the conclusion; it was "notice what you know, then do the work".
| Stage | What he did | Repeatable action |
|---|---|---|
| Signal | His wife's shopping basket: quality pantyhose sold where women already shopped weekly | Log everyday observations into a leads list — never trade on them directly |
| Verify | Confirmed repeat purchases, tested the rival knockoff, sized the remaining runway | Lead → financials → competitors: three steps before any buy |
| Size | Built a major Magellan stake only after the work | An idea is upgraded to a position only by completed homework |
| Exit & result | ≈6× until the Sara Lee acquisition | Exit when the growth story is acquired or fully played out |
Lynch's classic playbook, step by step
- Collect leads from daily life and work — shops, products, colleagues — into a written list.
- Classify every candidate (stalwart, cyclical, fast grower, turnaround, asset play): the category sets the research template.
- Tell the story in two minutes in plain words, then verify it in the filings.
- Size by category and conviction; in turnarounds, the cash runway is the clock.
- Sell by category rules — a delivered turnaround or a topped-out grower — not by price feelings.
Practical takeaways from Lynch's casebook
- Everyday life is a source of leads, never of conclusions — the work begins after the observation.
- In turnarounds, cash on the balance sheet is the clock: it buys the time the recovery needs.
- Categorize each stock (stalwart, cyclical, turnaround, fast grower) — the category dictates when to sell.
- The story should fit in two minutes, in plain words, or you do not understand it yet.
Track record & famous decisions
| Year / Period | Decision | Outcome |
|---|---|---|
| 1977–90 | Fidelity Magellan Fund | ≈29%/yr; AUM grew from $18M to $14B |
| 1982 | Chrysler turnaround at ≈$2 | top position; 10×+ within five years |
| 1970s | Hanes (L'eggs) via supermarket scuttlebutt | ≈6× before acquisition |
| 1989 | One Up on Wall Street | coined "tenbagger"; 1M+ copies sold |
In their own words
- "Know what you own, and know why you own it."
- "The real key to making money in stocks is not to get scared out of them."
- "Everyone has the brainpower to make money in stocks. Not everyone has the stomach."
Key facts
Last updated: June 18, 2026- Lynch coined the term "tenbagger" for a stock that returns ten times your money.
- His strategy classifies every stock into six categories: fast growers, stalwarts, slow growers, cyclicals, turnarounds and asset plays.
- His favorite shortcut was the PEG ratio — a P/E below the earnings growth rate suggested fair value (PEG under 1).
- Framework documented in One Up on Wall Street (1989).
Valuefocus, "Peter Lynch" (Last updated: June 18, 2026), https://valuefocus.io/masters/peter-lynch
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From a supermarket shelf to a six-bagger
In the early 1970s Peter Lynch's wife Carolyn came home with L'eggs — pantyhose sold in plastic eggs at the supermarket checkout. Lynch noticed something the spreadsheets missed: women visited a supermarket many times more often than a department store, so the product sat exactly where the customer already was, week after week.
But the observation was only step one. Lynch did the homework: store checks, the financials of maker Hanes, and competitor tests — he even had quality comparisons run against rival brands. Convinced, Magellan bought Hanes, and the stock became roughly a six-bagger before Sara Lee acquired the company. 'Buy what you know,' he insisted, 'is where research starts — never where it ends.'
Everyday observation finds the idea; a disciplined research routine turns it into an investment.
The turnaround everyone was sure would die
In 1982 the consensus said Chrysler was finished — the stock traded near $2 amid bankruptcy talk. Lynch did the unfashionable work: the balance sheet showed over $1 billion in cash after the government loan guarantee, giving it years of runway, and meetings with management revealed the upcoming minivan line.
He made Chrysler Magellan's largest position — not a small contrarian flutter. As the new models shipped and the cycle turned, the stock rose more than tenfold over the following five years.
The crowd's verdict is not analysis. The balance sheet and the showroom said something different from the headlines.
A 29%-a-year fund whose average investor did far worse
From 1977 to 1990 Peter Lynch ran Fidelity Magellan to roughly 29% a year — the best long-run record of any large mutual fund; $10,000 left alone became about $280,000. The fund's door was open to everyone, and millions walked through it.
Yet Fidelity's own analysis found the average dollar invested in Magellan earned dramatically less — many investors actually lost money. Cash flooded in after hot streaks and fled after every dip, so most owners systematically bought high and sold low. The fund's return and its investors' returns were two different numbers.
When you buy and when you sell can matter more than what you pick. A research routine exists to keep you invested through the dips.
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Frequently asked questions
Is "invest in what you know" enough by itself?
No — Lynch himself called that a misreading. Familiarity generates candidates; only fundamental homework (earnings, debt, valuation) turns a candidate into an investment thesis.
What is a "tenbagger"?
Lynch's term for a stock that grows tenfold. His point: a portfolio's returns are often driven by a few big winners held long enough — so do not trim flowers to water weeds.
Turn everyday observations into structured research:
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