Two growth stocks report in the same week. Both show earnings per share up about 57% from the same quarter a year earlier, and on a screen they look interchangeable. One of them has grown faster in every quarter for a year. The other has grown more slowly in every quarter for a year, and 57% is the lowest figure in its recent run. The headline number is the same. The direction is opposite, and quarterly earnings acceleration is the measurement that tells them apart.
This guide covers how to measure that sequence properly, where the arithmetic misleads, and what the result can and can’t tell you when you’re selecting growth stocks.
What quarterly earnings acceleration measures
Earnings acceleration is an increase in the rate of earnings growth across comparable reporting periods. The quantity being tracked is the growth rate itself, quarter after quarter. If a company grew earnings 15% in one quarter, then 22%, then 31%, the growth rate is rising. That rising sequence is acceleration.
Two common readings are too broad. A company can report record earnings every quarter while its growth rate falls, so higher earnings alone describe size and say nothing about the change in pace. A company can also hold a high growth rate, say 40% for four straight quarters, which is impressive and steady. Steady is a different finding from accelerating. Both are worth knowing, and they shouldn’t be filed under the same label.
The measurement also depends on what you call “comparable”. The rest of this guide is mostly about that word.
EPS and why the year-over-year comparison comes first
Earnings per share, or EPS, is net income attributable to common shareholders divided by the number of shares. Most growth analysis uses diluted EPS, which counts shares that options, convertible debt and similar instruments could add. EPS puts companies of very different size on a per-share footing and keeps the share count in view.
There are two ways to compare a quarter. The sequential comparison sets the latest quarter against the one immediately before it. The year-over-year comparison sets it against the same quarter twelve months earlier. They answer different questions.
Seasonality is the reason year-over-year usually leads. Take a hypothetical retailer that earned 0.90 per share in its holiday quarter and 0.35 in the following first quarter. Sequentially, EPS fell 61.1%. Against the 0.28 it earned in the same first quarter a year earlier, EPS rose 25.0%. The sequential figure mostly measures the calendar. The year-over-year figure compares like season with like season, which is why most growth-stock work builds the acceleration sequence from year-over-year rates.
Sequential change still has a use. For a business with little seasonality it can show a turn a quarter or two before the year-over-year figures catch up. I treat it as a secondary column and keep the year-over-year growth rates as the main sequence.
A worked table: accelerating versus decelerating
The table below uses hypothetical figures for two companies. Each row shows the quarter’s diluted EPS, the EPS from the same quarter a year earlier, and the resulting growth rate.
| Quarter | Company A EPS | A prior-year EPS | A YoY growth | Company B EPS | B prior-year EPS | B YoY growth |
|---|---|---|---|---|---|---|
| Q1 | 0.40 | 0.36 | 11.1% | 1.10 | 0.50 | 120.0% |
| Q2 | 0.48 | 0.40 | 20.0% | 1.20 | 0.62 | 93.5% |
| Q3 | 0.60 | 0.44 | 36.4% | 1.25 | 0.78 | 60.3% |
| Q4 | 0.74 | 0.47 | 57.4% | 1.30 | 0.83 | 56.6% |
When I lay out a table like this, I read the growth column top to bottom before I look at anything else. Company A runs 11.1%, 20.0%, 36.4%, 57.4%. Each quarter’s rate is higher than the last, so the sequence is accelerating. Company B runs 120.0%, 93.5%, 60.3%, 56.6%. Every one of those rates is strong, and EPS rose every quarter from 1.10 to 1.30, yet the rate fell three times in a row. Company B is decelerating.
The deceleration in B also has a visible cause in the table. Its prior-year comparators climb from 0.50 to 0.83, so each new quarter is measured against a much tougher base. That’s ordinary. Fast growth produces harder comparisons, and very few companies can sustain triple-digit rates for long.
Same latest quarter, different trajectories
Return to the screen from the opening. Company A’s latest quarter shows 57.4%. Company B’s shows 56.6%. A screen that filters on the most recent growth rate treats them as near equals.
The sequence separates them. A’s 57.4% is the top of a rising run, and the business appears to be gaining pace. B’s 56.6% is the bottom of a falling run from 120.0%, and the business appears to be settling toward a lower rate. Both readings describe recent history behind an almost identical headline figure, and neither one is a forecast.
This is the main reason I keep at least four quarters of growth rates beside each other on my notes for a candidate. One number gives you a level. Four give you a direction, and the direction is the thing acceleration is meant to capture.
The weak comparison quarter trap
A growth rate is a ratio, so it’s only as meaningful as its denominator. When the prior-year quarter was unusually weak, the current growth rate can look like a surge that the business never produced.
Consider hypothetical Company C. In one quarter it earned 0.30 against 0.27 a year earlier, up 11.1%. In the next it earned 0.32 against 0.10, up 220.0%. In the quarter after that it earned 0.33 against 0.29, up 13.8%. On a growth-rate chart the middle quarter is a spike that suggests dramatic acceleration. The EPS itself barely moved: 0.30, 0.32, 0.33.
The 0.10 comparator did the work. It might reflect a one-time charge, a plant shutdown or a weak season a year earlier. Whatever the cause, the 220.0% describes last year’s problem more than this year’s progress.
The check I use is a two-year comparison for any quarter whose comparator looks out of line with its neighbours. Company C’s 0.32 against the 0.26 it earned in the same quarter two years earlier is 23.1% over two years. That puts the quarter back in proportion. A sequence of rising growth rates built on a normal base is a better description of acceleration than one spike off a depressed quarter.
Losses, breakeven and the percentages that break
Percentage growth assumes a positive starting value. When the comparator is a loss, the ordinary formula produces numbers that mean nothing.
Suppose a company lost 0.15 per share a year ago and earned 0.05 this quarter. The formula gives (0.05 minus negative 0.15) divided by negative 0.15, which is negative 133.3%. A spreadsheet will report a decline for what was a clear improvement. Narrowing losses do the same thing: a move from a loss of 0.30 to a loss of 0.10 comes out as negative 66.7%.
Near-zero comparators cause the opposite distortion. Moving from 0.01 to 0.12 is technically 1,100% growth, a figure that says more about the denominator than the business.
These quarters need separate treatment. I record them as a change in dollars per share, so the loss-to-profit quarter above is plus 0.20, and I mark the growth rate as not meaningful. A transition to profitability can be an important event in its own right. It just doesn’t belong in the same column as ordinary percentage growth, and the acceleration sequence really starts once there are positive comparators to measure against.
Checks on whether the acceleration is real
Once the sequence looks accelerating, a few checks confirm that the figures being compared are actually comparable. These are confirmation steps. A full earnings-quality review is a separate exercise.
Reported versus adjusted EPS. Companies often publish both a reported figure under accounting standards and an adjusted figure that excludes items the company considers unusual. Either can be used, but the whole sequence must use the same one. Growth computed as this year’s adjusted EPS against last year’s reported EPS is a mismatch, and it can manufacture acceleration out of a change in definition.
Diluted share count. EPS can rise because net income rose or because the share count fell. If net income grows 20% while buybacks cut diluted shares by 6%, EPS grows 27.7%. Part of that rate came from the shrinking denominator. The reverse also applies: heavy issuance can hold EPS growth below net income growth. Comparing the net income growth rate with the EPS growth rate for the same quarters shows how much of any acceleration came from the share count.
Tax and accounting effects. A one-time drop in the tax rate can lift a quarter on its own. On pre-tax income of 100, a 25% tax rate leaves 75; a one-off 15% rate leaves 85, an increase of 13.3% with no change in the business. A change in accounting method, a large asset sale or a reversal of a prior charge can do the same. If one of these sits in the latest quarter, the acceleration it shows may not repeat.
Where quarterly earnings acceleration fits in stock selection
Current quarterly earnings are the C in the CAN SLIM approach to selecting growth stocks, and William O’Neil’s study of past market leaders gave weight to quarterly earnings growth that was increasing. Acceleration is useful in that role because it describes improving business momentum in a form you can measure and compare.
It remains one input. Earnings acceleration carries more weight when sales growth is accelerating alongside it, because EPS growth that runs far ahead of revenue growth often depends on cost cuts, margins or the share count, and those have limits. The source of growth matters too. A new product or service acting as the growth catalyst gives a reason the sequence might continue, while a sequence driven by a tax benefit gives none. Leadership within the industry group and the structure of the chart sit on top of all of it.
The price reaction to the report is a separate piece of information. A stock can gap higher on an accelerating quarter or fall on one that disappointed expectations, and how it behaves after an earnings gap and the price reaction that follows is its own lesson. The EPS sequence tells you what the business reported. The chart tells you how the market received it.
Two nearby measurements also get confused with quarterly acceleration. Multiyear annual earnings growth looks at full-year results over several years and describes whether growth has been sustained. A company can have a strong three-year record and a decelerating quarterly sequence, or the reverse. Changes in analyst forecasts, often called estimate revisions, describe what analysts expect the company to earn in future periods. Quarterly acceleration is built entirely from reported results, so it looks backward, while revisions look forward. All three can point the same way, and they frequently don’t.
What an accelerating EPS sequence can’t tell you
Every number in an acceleration table describes the past. By the time a quarter is reported, the market has had the figures, the conference call and often weeks of expectations beforehand. Some or all of the improvement may already be reflected in the price, and a rising sequence can coincide with a stock that has already made most of its move.
Acceleration also says nothing about durability. Growth rates that rise for four quarters will eventually meet harder comparisons, as Company B’s did, and the sequence will turn. The table can’t tell you when.
And acceleration doesn’t make a breakout valid. A base, a pivot and the volume on the breakout day are chart questions, answered on the chart. A trader using earnings acceleration in selection might use it to decide which stocks deserve attention, then wait for the chart to show whether the market agrees. Read the sequence, check the base it rests on, and keep it in proportion.
Learn the pattern. Ride the trend. Keep the gains.
Educational content only. Not investment advice. Trading involves risk. You are responsible for your decisions.
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