The takeaway
Legend Biotech Corp shows a pronounced seasonal pattern over 6 years of data — strongest in June (+15.0%) and softest in September (−2.2%).
Right now
In July, the stock has risen 67% of years, averaging +2.9%, about +0.7 pts better than the S&P 500.
The full picture
Legend Biotech Corp's most dependable month has been June, higher in 6 of 6 years; September has been its least reliable, up just 17% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| Median return % | ||||||||||||
| 2025 | ||||||||||||
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| 2023 | ||||||||||||
| 2022 | ||||||||||||
| 2021 | ||||||||||||
| 2020 | — | — | — | — | — |
Month by month
The stock's clearest edge over the S&P 500 lands in June (+14.8 pts); it has trailed the market most in December (−10.3 pts).
“vs S&P” is Legend Biotech Corp’s average for a month minus the S&P 500’s average for that same month — isolating Legend Biotech Corp’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, June has closed higher 100% of the time versus 100% across the last 6 years — the pattern is weakening.
Figures are the typical (median) June return and how often it rose — the last 5 years versus the last 6(the heatmap’s default window). This verdict stays anchored to that 6-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
The seasonal story is really one month's story — June. It has closed higher in all 6 Junes, a concentration the rest of the calendar can't touch.
The strength looks broad-based rather than freakish: its average (+15.0%) and median (+12.8%) sit close together, so no single blow-out year is flattering the figure. Few months are steadier: June's returns vary by just 7.9% year to year, and even its worst June in 6 years lost only 5.9% — the gentlest downside anywhere on its calendar. Better still, that strength is the stock's own and not just a buoyant market — June has outpaced the S&P 500 by +14.8 points on average. Few peers keep such company in June — the typical stock clears it just 52% of the time.
It doesn't stand entirely alone — March, April, and July have leaned firm as well, if less emphatically. The weaker half of the year is plainer: September has been the soft spot — the weakest of 7 months that average a loss (−2.2%), and the edge isn't year-round — the stock has trailed the S&P 500 in December, November, and August. Its roughest month on record was a −24.9% December in 2024 — a reminder of how hard even a seasonal name can fall.
June has now closed higher 6 years running. The pattern has softened of late, June's last five years slipping below its longer-run record.
For a stock this dependable in June, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on. With a short 6-year record, the signal is best held loosely.
Short answers on the stock's best month (June), its worst (September), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2020 its best month (June, +15.0%) has run well ahead of its worst (September, −2.2%) — the heatmap above shows how steady that gap has been year to year.
June has been the strongest, averaging +15.0% and closing higher in all 6 years on record since 2020.
It's the weakest, averaging −2.2% — 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.
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