The same six-gate discipline that tells you when to buy a growth stock tells you when to sell it. Here is how to read those signals — and one additional warning that operates on a different clock entirely.
At the end of Part 3, I made a promise: a future post would cover what to watch for after you buy, and when the right answer is to sell.
This is that post.
Buying a growth stock is not the hard part. Finding a company that passes all six gates — sustained revenue growth, sustained earnings growth, conservative debt, a clean earnings record, a reasonable price — that takes patience and a good screen. But the decision is binary. It passes or it doesn’t.
Selling is harder. The company is already in your portfolio. You have a cost basis, an unrealized gain (hopefully), and the natural human tendency to believe that because something worked, it will keep working. Selling requires a different muscle than buying. It requires discipline at exactly the moment emotion is loudest.
The growth screen gives you that discipline. The same criteria that let a stock in will tell you when to let it out.
What to Check After You Buy
Once a growth stock enters your portfolio, the monitoring doesn’t stop. Every time the company files a new quarterly report (a 10-Q — a three-month financial update companies are required to file with the SEC) or an annual report (10-K — the full-year version), you re-evaluate the same criteria that let the stock in.
Each criterion produces one of three signals:
ALL CLEAR — the metric is comfortably above the threshold. No concern.
WATCH — the metric is getting close to the line. Not a breach yet, but close enough to pay attention. Think of it as yellow on a traffic light. Pay close attention to this position.
SELL — the metric has crossed its threshold. The condition that justified owning this stock no longer holds.
This is not a panic process. A single WATCH signal is not a sell trigger. But a sustained SELL signal — especially on a core criterion — is the sell discipline doing exactly what it’s designed to do: enforcing the commitment you made when you bought.
Let’s walk through each criterion.
Criterion 1 — Revenue and Net Income Growth Falling Below the Hurdle
The most fundamental thing you bought when you bought a growth stock is the growth itself. You paid a price that incorporates an expectation of continued expansion. When that expectation breaks down, the justification for the position breaks down with it.
The hurdle rate is the minimum annual growth rate a company must sustain to stay on the list. It’s not an arbitrary number. It’s built from two live inputs: the current risk-free rate (the yield on a 10-year U.S. Treasury bond — the return you can get with essentially no risk) plus the equity risk premium (the extra return investors historically demand for taking on the uncertainty of owning stocks instead of bonds). Add those together, and you get the rate a growth company must exceed to justify the premium you paid for it. Currently, that’s roughly 8–9% annually.
Both revenue and net income must clear this hurdle — and they must clear it at both the five-year and ten-year timeframe. That’s four separate checks:
- Five-year revenue CAGR above the hurdle
- Ten-year revenue CAGR above the hurdle
- Five-year net income CAGR above the hurdle
- Ten-year net income CAGR above the hurdle
(CAGR — Compound Annual Growth Rate — is the smoothed annualized growth rate over a period. A 5-year revenue CAGR of 14% means revenue grew, on average, 14% per year over the last five years. It’s calculated as: ending revenue divided by starting revenue, raised to the power of one-fifth, then subtract one. It smooths out individual year-to-year noise.)
If any of these four rates slips below the hurdle, that’s a SELL signal.
Why both timeframes? The five-year rate catches recent deterioration — a company whose growth has stalled in the last few years. The ten-year rate catches a longer story — a company that looked like a growth stock but has been decelerating for most of a decade. Together they require growth at both the recent and the long-run level.
What this looks like in practice: Imagine you own a technology company. It passed the screen three years ago with a 5-year revenue CAGR of 16% and a 10-year CAGR of 18%. Now a new filing comes in. Competition has intensified. The 5-year CAGR has fallen to 7%. The hurdle is 8.8%. That’s a SELL signal on revenue growth.
The growth story you bought has changed. The company is still growing — 7% is not collapse — but 7% does not justify the premium growth valuation you paid when you bought it. That premium was for something the company is no longer delivering.
Criterion 2 — Debt-to-Equity Crossing 1.0
Debt-to-Equity ratio (D/E ratio) measures how much debt a company is carrying relative to its equity — the shareholders’ stake in the business. A ratio below 1.0 means the company has more equity than debt. A ratio above 1.0 means the company has borrowed more than its equity base.
The growth screen requires a D/E ratio below 1.0 at entry. The same ceiling applies while you hold the stock.
Here’s why this matters for a growth company specifically.
Growth requires reinvestment. The company needs to hire, build, expand, develop — all of which costs money. There are two ways to fund that: with earnings (internally generated cash) or with borrowed money (debt).
A company funding growth with earnings is building something durable. The growth is self-financing. Every new capacity addition comes from cash the business generated itself.
A company funding growth with borrowed money is making a bet. The debt must be serviced — interest paid, principal eventually returned. That obligation is fixed even when the business hits a rough quarter. If the growth slows at the same time the interest payments come due, the company finds itself in a squeeze: less cash coming in, same cash going out.
When D/E crosses 1.0, the capital structure has tipped. Lenders have a bigger claim on the business than shareholders do. That’s not necessarily fatal, but it’s a meaningful change in the risk profile. The company you own today is carrying more financial risk than the company you originally screened. The sell signal tells you: this is no longer the same position you evaluated.
Criterion 3 — A Negative Quarter in the Trailing 20 Quarters
The earnings consistency requirement is exactly what it sounds like. During the last five years — 20 quarters — the company must not have reported a single quarter with negative earnings per share.
(Earnings per share, or EPS, is the portion of the company’s net profit that belongs to each share of stock. If a company earns $100 million and has 100 million shares outstanding, EPS is $1.00 per share. A negative EPS means the company lost money in that quarter.)
One losing quarter in five years triggers a SELL signal.
This sounds strict. It is strict. That’s the point.
The screen wasn’t looking for companies that mostly grow. It was looking for companies that have demonstrated the ability to grow consistently, through different market conditions, without losing ground. One loss quarter is evidence that the consistency has broken. Maybe it’s temporary. Maybe it’s the beginning of something worse. These criteria don’t try to guess — they just flag the breach and let you decide.
Think of it this way: the zero-negative-quarters requirement was a promise the company made by passing the screen. When it’s broken, the basis for that promise has changed. You should at minimum be asking: why did this quarter go negative, and is the reason temporary or structural?
If it’s temporary — a one-time write-off, a supply chain disruption, an unusual legal settlement — the thesis may still be intact. But the criterion has told you to look. That’s what it’s for.
If it’s structural — the business is genuinely losing ground — you want to know as early as possible.
Criterion 4 — Trailing P/E Exceeding the S&P 500 Historical Average
The fourth gate is about valuation — specifically, whether the stock’s price has run ahead of what the screen considers a reasonable multiple.
P/E ratio — price divided by earnings per share — measures how much you’re paying for each dollar of earnings. A P/E of 20 means you’re paying $20 for each $1 the company earns annually. The trailing P/E uses the last twelve months of actual earnings (not projected future earnings), so it’s grounded in what the business has already produced.
The threshold is the 10-year trailing average P/E ratio of the S&P 500 — currently around 19.5, fetched live from market data each time the screen runs. This is the market’s long-run average “price” for $1 of earnings across all 500 of America’s largest companies.
The growth screen required, at entry, that the stock’s P/E be at or below this average. The same ceiling applies while you hold.
When a growth stock’s P/E exceeds this ceiling, that fires a SELL signal. The stock is now trading at a premium that the market has not historically sustained across its broad index.
Here’s the logic: when you pay 35 times earnings for a stock, you are paying in advance for years of earnings you haven’t received yet. If the growth continues as expected, that bet pays off. But you have no margin of error. If growth slows even slightly, the premium evaporates — and the stock can fall hard even though the underlying business is still profitable.
The P/E ceiling is not a prediction that the stock will fall. It’s a signal that you’ve captured the available upside that was priced in when you bought. The gap between the current price and fair value — the gap you earned when you bought at or below the S&P average multiple — has closed, and may have inverted. Time to look for the next candidate trading at a reasonable price.
The WATCH Zone — Between Green and Red
One important nuance: there’s a meaningful difference between a metric that is approaching the line and one that has actually crossed it.
A WATCH signal fires when a metric is within 20% of its threshold. On the P/E criterion, for example, a WATCH might fire when the trailing P/E reaches 17 and is climbing toward the 19.5 ceiling — that’s a signal to pay attention, not to act. On the revenue CAGR criterion, a WATCH might fire when the 5-year CAGR is at 10% and declining toward the 8.8% hurdle.
WATCH signals are information. They’re the investing equivalent of a yellow traffic light. Use them to review the position more carefully: re-read the most recent earnings report, check management’s guidance, look at the competitive landscape. The sell criteria are deliberately clear-cut so you don’t have to make these judgment calls in the heat of a falling market — but a WATCH is a prompt to look.
A single WATCH signal, with all other criteria at ALL CLEAR, typically does not require action. A SELL on any criterion — especially on growth or leverage — warrants one.
The Wealth-Destroyer Signal — A Fifth Check That Runs on Its Own Clock
Everything above describes the growth screen’s own sell logic: the same five criteria re-evaluated on each new filing. That’s one monitoring layer.
There’s a second layer that operates independently, outside the growth-screen criteria. It applies to every holding across every portfolio — not just growth stocks. This is the wealth-destroyer check.
Here’s the concept.
When a company reinvests its earnings — keeping money in the business instead of paying it out as dividends — it is essentially making a promise to you as a shareholder: I will generate more value with this capital than you could generate yourself.
Whether it keeps that promise depends on two numbers:
ROIC — Return on Invested Capital — measures the return the company earns on the capital it has put to work. Think of it as the “yield” on reinvestment. A ROIC of 14% means the company generates 14 cents of profit for every dollar of capital it has deployed.
WACC — Weighted Average Cost of Capital — the minimum return that shareholders and lenders require to stay invested. This is the hurdle, the cost of capital. You built this number from scratch in the Intrinsic Value series.
If ROIC > WACC: every reinvested dollar creates more than a dollar of value. Here’s why: if ROIC is 14% and WACC is 8%, each dollar the company reinvests generates 14 cents of profit every year — not just in year one, but indefinitely, as long as it can deploy capital at that rate. That permanent annual stream of 14 cents, discounted back at the cost of capital (8%), has a present value of $0.14 ÷ 0.08 = $1.75. The reinvested dollar becomes $1.75 of value — 75 cents created above the dollar put in. The ROIC-to-WACC ratio (14 ÷ 8 = 1.75×) is the value multiplier for every reinvested dollar. The company is building wealth for you. This is the wealth-creator condition.
If ROIC < WACC: every reinvested dollar destroys value — even if total earnings are growing, even if the quarterly report looks fine. The arithmetic runs the same way in reverse: if ROIC is 5% and WACC is 8%, each dollar reinvested generates a permanent stream of 5 cents per year. Discounted at 8%, that stream is worth $0.05 ÷ 0.08 = $0.625 — only 62.5 cents for every dollar put in. Each reinvestment decision is quietly shrinking the company’s intrinsic value, even as revenue and earnings tick upward. The company is paying more for its capital than the capital earns. Each year of reinvestment makes the situation worse. This is the wealth-destroyer condition.
Here’s what makes this signal different from the four growth-screen criteria above: it can trigger even when all four hard gates are green.
Imagine a growth company that is still hitting its revenue CAGRs, still below 1.0 on D/E, still profitable every quarter, still trading below the S&P average P/E. The growth-screen criteria are all at ALL CLEAR.
But somewhere in the operating structure, the returns on reinvestment have eroded. ROIC has slipped below WACC. The business is growing, and the growth looks fine from the outside — but the internal economics have turned against you. Every dollar being plowed back into the business generates less than a dollar of value. The company is getting larger and less efficient at the same time.
This is a sell signal that the growth screen cannot see. The growth screen watches for deterioration in the metrics that got the stock in. The wealth-destroyer check watches for something more subtle: whether the reinvestment engine itself has broken.
Why these are separate checks. The growth-screen criteria catch a company that is failing to grow. The wealth-destroyer check catches a company that is growing but creating no value while doing it. Both are real problems. They just require different monitors to detect.
This is why the two checks should never be conflated. A company can pass every growth-screen criterion and still be destroying wealth with each dollar it reinvests. And the inverse is also true: a company can have ROIC modestly below WACC in a single year — maybe during a heavy investment cycle — without triggering a sell if the other metrics are strong and improving.
The signal is most meaningful when it is sustained. A single quarter of ROIC below WACC, especially during a known investment surge, may not be actionable. But a multi-quarter pattern — ROIC consistently trailing WACC — is a structural signal. The reinvestment engine has broken, and no amount of continued growth will fix the problem at the root.
Putting It Together
You own a growth stock. It passed six gates when you bought it. Now, on every new quarterly or annual filing, run it through those same gates and check the signal for each.
If everything is ALL CLEAR, hold. The position is behaving as expected.
If you see a WATCH, check in. Re-read the filing. Think through whether the trend is temporary or directional. No automatic action required — but this is not the time to be passive either.
If you see a SELL on a hard criterion — especially on revenue or earnings growth — the stock has ceased to be what it was when you bought it. The discipline that says you exit is the same discipline that said you buy. If you abandon it on the sell side, the whole framework breaks.
And separately, regardless of what the growth-screen signals show — if the wealth-destroyer check has been running red for multiple quarters, pay attention. You may be holding a company that is growing itself into a poorer business, one reinvested dollar at a time.
The sell is not a failure. Exiting a position that no longer meets its own criteria is the discipline working correctly. The capital you recover becomes the capital you deploy into the next candidate — one that still passes all its gates, still earns above its cost of capital, and still offers you the kind of growth your portfolio is designed to capture.
A Note to Luca and Lili
The sell discipline is where most growth investors go wrong.
They find a great company. It grows for years. The stock triples. They’ve made the most satisfying investment of their life, and now they don’t want to let it go.
Then the growth slows. One gate turns yellow. Then another. Maybe an earnings quarter goes negative — the first one in years. And instead of following the framework they built when they were thinking clearly, they start reasoning around it. “The quarter was unusual.” “The CAGR will recover.” “The debt is temporary.”
Sometimes they’re right. But the framework wasn’t built for the times you’re right. It was built for the times you can’t tell — which is most of the time. The criteria are clear-cut precisely so that emotion doesn’t get to vote. A gate is either clear or it isn’t.
I want you to understand something about discipline: it is not valuable when it’s easy. It’s valuable when following it is uncomfortable. That’s the only time it actually does anything.
When a position you love starts flashing SELL, that is exactly when the sell criteria are most useful — and exactly when it will feel most wrong to follow them. Follow them anyway. The framework will outlast any single position. Your portfolio, built over decades, needs a sell discipline more than it needs to be right about any individual stock.
— Papa
The One-Sentence Summary
The same five criteria that screen a growth stock in — sustained revenue and net income CAGRs above the hurdle rate, Debt-to-Equity below 1.0, no negative earnings quarters in the trailing five years, and a trailing P/E at or below the S&P 500 historical average — are re-evaluated on every new filing and produce a SELL signal the moment any criterion is breached, while a separate, independent wealth-destroyer check watches whether the company’s reinvestment is earning above its cost of capital, a signal the growth screen itself cannot see.
← Part 3: Reading the Scorecard
The Growth Investing series is now complete. Explore all parts on the Growth Investing series page.
— Jim