Based on Kenneth Fisher, Super Stocks (1984)
Overview — The Super Stock Philosophy
The Super Company Concept
Price-to-Sales Ratio (PSR) — Fisher's Master Metric
The Product Life Cycle and Company Growth Stages
Profit Margins and Their Predictive Power
The Glitch — Temporary Problems Creating Opportunity
Balance Sheet Analysis
Management Assessment
Three Types of Super Stocks
Entry Rules
Exit Rules
Portfolio Management
Common Mistakes and Pitfalls
Complete Investment Lifecycle Example
Key Quotes
Kenneth Fisher (son of Philip Fisher, the legendary growth investor) wrote Super Stocks to solve a specific problem: how do you find companies whose stock prices will increase three to ten times over a three-to-five-year period? His answer is not to chase hot stocks or follow market trends, but to identify fundamentally superior businesses that are temporarily mispriced by Wall Street.
Fisher's central thesis rests on three pillars:
Fisher's approach is fundamentally different from both pure growth investing and pure value investing. He wants growth — but only at a price that provides a large margin of safety. The PSR is his tool for quantifying that margin of safety in a way that P/E ratios cannot.
Target universe: Primarily technology, healthcare, and industrial companies with revenues between $100 million and $5 billion (in 1984 dollars; adjusted for inflation, roughly $300 million to $15 billion today). The method works best for companies with identifiable products, measurable markets, and margins that can be benchmarked against industry norms.
Expected holding period: 2-5 years. Fisher is not a trader. He buys when a stock is deeply undervalued by PSR standards and holds until the PSR reaches overvalued territory.
A "super company" is Fisher's term for a business that consistently earns profit margins significantly above its industry average. This is the foundation of everything — without superior profitability, a low PSR means nothing (it may simply reflect a permanently mediocre business).
Characteristics of a super company:
Fisher argues that the market obsesses over earnings growth but pays insufficient attention to the quality of that growth. Two companies can both grow revenues at 20% per year, but if Company A has 20% pre-tax margins and Company B has 5% margins:
High-margin companies are inherently more resilient and more valuable per dollar of revenue. This is why the PSR — which compares price to revenue — is meaningful only in the context of what margins the company earns on that revenue.
Before classifying a company as a super company, Fisher requires evidence that high margins are structural rather than cyclical:
PSR = Market Capitalisation / Total Annual Revenue
= Share Price / Revenue Per Share
Fisher popularised this metric (he effectively invented it for practical stock selection) because of its advantages over P/E:
| Feature | PSR | P/E |
|---|---|---|
| Available when unprofitable | Yes — revenues always exist | No — negative earnings = N/A |
| Manipulation resistance | High — revenue is harder to | Low — earnings are easily |
| manipulate than earnings | managed via accounting | |
| Stability | High — revenue is less | Low — earnings swing wildly |
| volatile than earnings | with the cycle | |
| Comparability | Meaningful across industries | Less comparable across |
| when adjusted for margins | different capital structures |
Fisher's empirical research established clear valuation zones:
PSR Valuation Scale
====================
PSR < 0.75 BUY ZONE — Strong buy. The market is significantly
undervaluing the company's revenue stream. This is
where super stocks are found.
PSR 0.75-1.0 ATTRACTIVE — Worth buying if the company is a genuine
super company with strong margins and growth.
PSR 1.0-1.5 FAIR VALUE — Hold if already owned. Do not initiate
new positions unless the growth outlook is exceptional.
PSR 1.5-3.0 AVOID ZONE — Overvalued relative to revenue. Do not
buy. If owned, begin looking for exit opportunities.
Most new purchases in this range will produce poor
long-term returns.
PSR > 3.0 SELL ZONE — Significantly overvalued. Sell. Virtually
no stock with a PSR above 3 delivers adequate long-term
returns. The risk of a major decline is very high.
The raw PSR must be interpreted in context:
Fisher's empirical finding (supported by subsequent academic research) is that stocks with low PSRs — particularly those below 0.75 — significantly outperform the market over 3-5 year periods. The reason is psychological:
Fisher integrates the product life cycle concept directly into his stock selection. Every company passes through identifiable stages, and each stage has different risk/reward characteristics:
Stage 1: Development / Startup
Stage 2: Rapid Growth
Stage 3: Mature Growth
Stage 4: Maturity / Stagnation
Stage 5: Decline
Fisher uses these diagnostics to determine where a company sits in its lifecycle:
Fisher considers pre-tax profit margins the single best predictor of future stock performance when combined with PSR:
Margin Classification
======================
Pre-tax Margin > 15% SUPERIOR — The company has genuine pricing power
and/or cost advantages. This is the super company
territory.
Pre-tax Margin 7-15% AVERAGE — Competitive industry, no special
advantage. Can still be a super stock if margins
are expanding rapidly from a trough.
Pre-tax Margin < 7% INFERIOR — Either the industry is brutally
competitive or the company is poorly managed.
Only interesting as a turnaround candidate.
Fisher's key insight about margins is that they tend to revert to a company-specific norm rather than an industry average. A super company that temporarily sees margins compress from 20% to 10% due to a glitch is likely to see margins revert to 18-22% once the glitch is resolved. This creates a powerful investment thesis:
Fisher tracks margins over a 5-year rolling period and looks for:
The "glitch" is Fisher's most actionable concept. A glitch is a temporary, fixable problem that causes Wall Street to abandon a stock, driving the PSR into the buy zone. The critical distinction is between a glitch (temporary) and a fundamental deterioration (permanent).
Product-related glitches:
Management-related glitches:
Market-related glitches:
Self-inflicted glitches:
This is the most important analytical judgment in the entire system:
| Signal | Glitch (Buy) | Deterioration (Avoid) |
|---|---|---|
| Revenue trend | Stable or still growing | Declining for 2+ quarters |
| Competitive position | Unchanged — still #1 or #2 | Losing share to competitors |
| Product relevance | Products still in demand | Products becoming obsolete |
| Management response | Acknowledged, plan to fix | Denial, blame, or confusion |
| Customer behaviour | Customers still buying | Customers switching away |
| Industry dynamics | Industry still growing | Industry in structural decline |
| Balance sheet | Strong enough to weather storm | Deteriorating, rising debt |
| Insider behaviour | Insiders holding or buying | Insiders selling aggressively |
The investment thesis for a glitch stock follows a predictable pattern:
Fisher uses the balance sheet as a safety check — not as a primary selection tool, but as a way to eliminate companies that lack the financial strength to survive a glitch:
Debt-to-equity ratio: Should be below 0.40 for most industries. Companies with high debt cannot weather temporary problems and may be forced into dilutive capital raises at exactly the wrong time.
Current ratio: Should be above 1.5. A company that cannot cover short-term obligations is at risk of a liquidity crisis that turns a glitch into a catastrophe.
Interest coverage: Pre-tax profit should cover interest expense by at least 5x. Lower coverage means the company is vulnerable to rising rates or a margin squeeze.
Cash position: Fisher prefers companies with substantial cash reserves. Net cash (cash minus total debt) is ideal — it means the company has a war chest to invest through downturns.
Accounts receivable trends: Rising receivables relative to revenue may signal that the company is stuffing channels or extending credit to maintain sales — a warning of future revenue weakness.
Inventory trends: Rising inventory relative to cost of goods sold may signal weakening demand or obsolescence risk.
Fisher identifies specific patterns that disqualify a stock from consideration:
Following his father Philip Fisher's emphasis on qualitative analysis, Kenneth Fisher evaluates management through specific, observable behaviours:
Ownership stake: Managers who own significant stock (at least 5% collectively) are aligned with shareholders. Insider ownership below 1% is a warning.
Capital allocation history: How has management deployed free cash flow?
Communication honesty: Does management candidly discuss problems, or do they spin every negative into a positive? Fisher values managers who under-promise and over-deliver.
Operational focus: Managers who obsess over product quality and customer satisfaction build durable franchises. Managers who obsess over financial engineering and short-term earnings management destroy value.
Track record through adversity: How did management handle the last downturn? Did they cut costs intelligently, protect the core business, and emerge stronger? Or did they panic, slash R&D, and lose talent?
Inherited directly from Philip Fisher, the scuttlebutt method involves gathering information from non-traditional sources:
Definition: Companies with superior profitability, strong growth, and dominant competitive positions that are temporarily undervalued due to a glitch.
Characteristics:
Expected return: 3-10x over 3-5 years as the glitch resolves, margins recover, and the PSR re-rates from below 0.75 to 1.5-3.0.
Risk: The "glitch" turns out to be a permanent deterioration.
Fisher's favourite type: This is the core of the strategy. Super companies at bargain PSRs are the highest-probability, highest-return opportunities.
Definition: Companies in cyclical industries (autos, chemicals, steel, construction) that have superior cost structures and balance sheets, bought at the bottom of the cycle when PSRs are lowest.
Characteristics:
Expected return: 2-5x over 1-3 years as the cycle turns and the PSR re-rates.
Risk: You buy too early (the cycle has further to fall) or the cycle does not recover because of structural change in the industry.
Key difference from super companies: The valuation thesis is cyclical recovery, not glitch resolution. You must be right about the cycle, not just the company.
Timing the cycle:
Definition: Companies that were once super companies, lost their way, and are now in the process of restoring their historical profitability under new management.
Characteristics:
Expected return: 3-10x over 2-5 years if the turnaround succeeds.
Risk: Highest of the three types. Many turnarounds fail. Fisher recommends smaller position sizes and stricter diversification for turnaround investments.
The turnaround checklist:
Entry Filter Checklist
=======================
1. PSR < 0.75 The stock must be in the buy zone. No exceptions.
For the fastest-growing super companies, PSR < 1.0
is acceptable if all other criteria are exceptional.
2. Pre-tax margins For super companies: must have historical track
above industry avg record of margins 50%+ above industry. Current
margins may be depressed (that is the opportunity),
but must show evidence of recovery potential.
3. Revenue growth Trailing 5-year revenue CAGR should be at least
>= 15% CAGR 15% for super companies. For cyclicals, revenue
should be above the prior cycle trough. For
turnarounds, revenue base must be substantial.
4. Debt-to-equity Below 0.40 for super companies and turnarounds.
< 0.40 Below 0.60 for cyclicals (which typically carry
more debt).
5. Current ratio > 1.5 The company must be able to cover short-term
obligations comfortably.
6. Identifiable glitch There must be a specific, articulable reason why
the stock is cheap. If you cannot identify the
glitch, the low PSR may reflect genuine permanent
problems.
7. Product still viable The company's core products must still be in demand.
Customers must still need what the company sells.
8. Management quality At least one of: significant insider ownership (>5%),
recent insider buying, or a new CEO with a strong
turnaround track record.
Fisher does not prescribe rigid position-sizing rules, but his principles imply:
Fisher is not a market timer, but he offers practical guidance:
Exit Trigger Checklist
=======================
1. PSR > 3.0 SELL IMMEDIATELY. No stock with PSR > 3.0 offers
adequate risk/reward regardless of growth rate.
2. PSR 1.5-3.0 BEGIN SELLING. The stock is no longer cheap. Sell
at least 50% of the position. Hold the remainder
only if growth is accelerating and margins are
expanding.
3. Margin deterioration If pre-tax margins decline for 3+ consecutive
quarters without a clear temporary explanation,
sell. The super company thesis may be broken.
4. Revenue decline Two consecutive quarters of year-over-year revenue
decline for a non-cyclical company = sell. The
product life cycle may have shifted to Stage 4-5.
5. Balance sheet Debt-to-equity rising above 0.75, or current ratio
deterioration falling below 1.0 = sell. The company's financial
safety margin has evaporated.
6. Management departure If the CEO and/or key executives leave unexpectedly,
and the departures are not part of a planned
succession, sell at least 50% of the position.
7. Competitive Clear evidence that a competitor has developed a
disruption superior product or technology that threatens the
company's core franchise = sell.
8. Thesis violation If the specific reason you bought the stock no
longer holds (e.g., the glitch turns out to be
permanent, the turnaround plan is abandoned, the
cycle does not recover), sell regardless of the
current PSR.
Fisher recommends scaling out rather than dumping entire positions:
If a stock has been held for 3+ years with no significant price appreciation and the thesis has not played out, consider selling regardless of the current PSR. Capital has an opportunity cost, and a stagnant investment ties up money that could be deployed in a higher-probability opportunity.
Fisher recommends a concentrated but not reckless portfolio:
Fisher differs from many value investors in this regard:
Fisher suggests monitoring the overall portfolio's weighted-average PSR:
The most dangerous mistake. A low PSR on a bad company is not a bargain — it is a value trap. PSR 0.30 on a company with 2% margins, declining revenue, and heavy debt is correctly priced. The PSR filter only works on super companies (or former super companies in turnaround).
This requires the most analytical judgment. Key warning signs that a "glitch" is actually permanent:
Fisher emphasises that super stocks often triple or quadruple over several years. The temptation to take a 50% profit after a year is strong, but it means missing the remaining 200-300% gain. Sell based on PSR zones, not based on arbitrary profit targets.
A super company with a weak balance sheet is far more vulnerable to a glitch because:
Every super stock has a compelling narrative. The danger is continuing to hold — or worse, adding to — a position after the thesis has clearly broken because you are emotionally attached to the story.
Owning 50+ stocks makes it impossible to research each one deeply. Fisher's scuttlebutt approach requires time and effort. Better to own 15 stocks you know deeply than 50 stocks you know superficially.
While Fisher is a bottom-up stock picker, he acknowledges that buying even the best super stock at the peak of a bull market (when all PSRs are elevated) reduces returns. Having a cash reserve for bear markets is a meaningful edge.
You run your PSR screen against a universe of 3,000 mid-cap stocks and identify 45 companies with PSR below 0.75. You filter further for margin quality and arrive at 8 candidates. One stands out:
MedTech Instruments — Screening Results
-----------------------------------------
Market cap: $800 million
Annual revenue: $1.4 billion
PSR: 0.57 ($800M / $1,400M)
5-year revenue CAGR: 18%
Pre-tax margin (5yr avg): 16.2% (industry average: 9.8%)
Current pre-tax margin: 8.1% (depressed)
Debt-to-equity: 0.28
Current ratio: 2.1
Insider ownership: 7.2%
Recent insider buying: CFO bought $250K of stock 6 weeks ago
The PSR is deep in the buy zone (0.57 < 0.75). The company has historically been a super company (16.2% margins vs. 9.8% industry average). Current margins are depressed (8.1%), suggesting a glitch. All balance sheet criteria pass.
You investigate and discover:
Assessment: This is a textbook glitch. The problem was real but temporary. The company's competitive position is unchanged. The margin depression is due to one-time costs that will not recur.
Month 1: The stock drifts to $12.50. Another analyst downgrades. PSR drops to 0.51. The fundamentals are unchanged. You hold.
Month 2: Quarterly earnings show revenue down 8% (factory shutdown impact). Margins are still depressed at 7.5%. The stock drops to $11.00. PSR = 0.45. Your position is down 21%. You re-check the thesis: the factory is now back to full production. Customer orders are being filled. You add the remaining 40% of your position: 1,818 shares at $11.00 = $20,000. Total position: 5,388 shares, average cost $13.00.
Month 4: First full quarter with the factory back online. Revenue up 3% year-over-year. Margins improve to 11.2%. Stock rises to $13.50. PSR = 0.55.
Month 6: Revenue up 15% year-over-year. Margins at 13.8% (approaching historical norms). The backlog is being cleared. One analyst upgrades to "buy." Stock rises to $19.00. PSR = 0.78. Position is worth $102,372 (up 46% on invested capital of $70,000).
Month 9: Revenue up 22%. Margins at 15.5% (back to super company levels). Two more analysts initiate coverage. A mid-cap growth fund takes a 4% stake. Stock rises to $26.00. PSR = 1.06.
Month 12: Revenue up 20%. Margins at 16.8%. Stock reaches $32.00. PSR = 1.31.
Month 12: PSR = 1.31 (in the 1.0-1.5 fair value range). Per the gradual exit rules, you sell 25% of the position: 1,347 shares at $32.00 = $43,104.
Month 15: Stock reaches $42.00. PSR = 1.71 (entered the avoid zone). You sell another 25%: 1,347 shares at $42.00 = $56,574.
Month 18: Stock reaches $48.00. PSR = 1.96. You sell the remaining 50%: 2,694 shares at $48.00 = $129,312.
Result Summary
===============
Total invested: $70,000 (5,388 shares at avg $13.00)
Total proceeds: $228,990
Net profit: $158,990
Return: 227% over 18 months
Annualised: ~120%
PSR at entry: 0.57 (buy zone)
PSR at exit: 1.71-1.96 (avoid zone)
Margin at entry: 8.1% (depressed by glitch)
Margin at exit: 16.8% (restored to super company level)
"The price-sales ratio is the single most important tool for determining when to buy a stock. It works because it compares market price to the most stable, hardest- to-manipulate fundamental measure of a company's size — its revenues."
"A super company is one with annual after-tax profit margins that average more than 5 percent over a long period, and that are far above the average margins of other firms in the same industry."
"Buy when the PSR is below 0.75. Avoid when it is above 1.5. And never, ever pay more than 3 times sales for any stock, no matter how wonderful the story."
"The best time to buy a super company is when some temporary problem — a glitch — has caused Wall Street to throw the baby out with the bathwater. The underlying business is fine, but the stock is priced as if it is permanently damaged."
"Profit margins are the key to the whole game. A company with high margins converts each dollar of revenue into more profit. When you buy that company cheaply on a price-to-sales basis, you are getting those high-margin dollars at a discount."
"Most investors fail because they focus too much on earnings and not enough on revenues. Earnings can be manipulated, managed, and massaged. Revenues are what they are."
"The biggest mistake investors make is confusing a temporary setback with a permanent deterioration. If the company's products are still needed, its customers are still buying, and its competitive position is intact, a low stock price is an opportunity, not a warning."
"Never fall in love with a stock. The PSR tells you when to buy and when to sell. If you ignore it because you believe the story is too good, you will eventually learn an expensive lesson."
"Super cyclicals should be bought when nobody wants anything to do with the industry. When business magazines run cover stories about the death of an industry, that is often the best time to buy the strongest company in that industry."
"The balance sheet is not where you find great stocks, but it is where you avoid disasters. A super company with a weak balance sheet is not a super stock — it is a bankruptcy candidate during the next downturn."
"Turnarounds are the most dangerous type of super stock because they require you to bet on management's ability to fix what is broken. Many turnarounds fail. Size your positions accordingly."
"Patience is the super stock investor's greatest asset. You buy when the PSR is low and the news is bad. You wait — sometimes for two or three years — for the market to recognise what you already know. The profits come to those who can endure the discomfort of being early."
End of implementation specification.