The takeaway
Core Laboratories NV shows a moderate seasonal pattern over 10 years of data — strongest in June (−0.6%) and softest in August (−8.1%).
Right now
In July, the stock has risen 30% of years, averaging +0.4%, roughly 1.8 pts behind the S&P 500.
The full picture
Core Laboratories NV's most dependable month has been June, higher in 6 of 10 years; August has been its least reliable, up just 20% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | ||||||||||||
| 2023 | ||||||||||||
| 2022 | ||||||||||||
| 2021 | ||||||||||||
| 2020 | ||||||||||||
| 2019 | ||||||||||||
| 2018 | ||||||||||||
| 2017 | ||||||||||||
| 2016 |
Month by month
The stock's clearest edge over the S&P 500 lands in April (+5.6 pts); it has trailed the market most in August (−8.4 pts).
“vs S&P” is Core Laboratories NV’s average for a month minus the S&P 500’s average for that same month — isolating Core Laboratories NV’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, June has closed higher 40% of the time versus 60% across the last 10 years — the pattern is weakening.
Figures are the typical (median) June return and how often it rose — the last 5 years versus the last 10(the heatmap’s default window). This verdict stays anchored to that 10-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
The year leans June's way without overwhelming the rest of it: the stock has closed higher in 6 of 10 Junes, its most dependable month if not a dominant one.
Its average (−0.6%) and median (+1.5%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. That reliability comes with real swings, mind — even June ranges by 11.4% from year to year, so any single year can land far from the average.
A few other months pull their weight: March and September have also closed higher more often than not. At the other end of the calendar, August has been the soft spot — the weakest of 6 months that average a loss (−8.1%), and the edge isn't year-round — the stock has trailed the S&P 500 in August, March, and December. Its roughest month on record was a −62.6% March in 2020 — a reminder of how hard even a seasonal name can fall.
The pattern has softened of late, June's last five years slipping below its longer-run record.
Treat it as a tendency rather than a rule — seasonality describes the past, not a promise. With returns that swing hard year to year, the signal is best held loosely.
Short answers on the stock's best month (June), its worst (August), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2016 its best month (June, −0.6%) has run well ahead of its worst (August, −8.1%) — the heatmap above shows how steady that gap has been year to year.
June has been the strongest, averaging −0.6% and closing higher in 6 of 10 years since 2016.
It's the weakest, averaging −8.1% — historically a soft spot, though it still varies from year to year.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade