The takeaway
Arista Networks shows a moderate seasonal pattern over 10 years of data — strongest in November (+8.1%) and softest in June (+1.3%).
Right now
In July, the stock has risen 70% of years, averaging +8.8%, about +6.6 pts better than the S&P 500.
The full picture
Arista Networks's most dependable month has been November, higher in 8 of 10 years; June has been its least reliable, up just 50% 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 July (+6.6 pts); it has trailed the market most in April (−1.6 pts).
“vs S&P” is Arista Networks’s average for a month minus the S&P 500’s average for that same month — isolating Arista Networks’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, November has closed higher 80% of the time versus 80% across the last 10 years — the pattern is weakening.
Figures are the typical (median) November 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
This is a stock you can almost set a calendar by, and November is the anchor — it has closed higher in 8 of 10 Novembers, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+8.1%) and median (+7.2%) sit close together, so no single blow-out year is flattering the figure. That reliability comes with real swings, mind — even November ranges by 11.7% from year to year, so any single year can land far from the average. Better still, that strength is the stock's own and not just a buoyant market — November has outpaced the S&P 500 by +5.8 points on average. Few peers keep such company in November — the typical stock clears it just 62% of the time.
November anchors a run, too: the October-through-January window has been the stock's reliable season. The weaker half of the year is plainer: June is the year's low point, though even there the stock has stayed positive on average (+1.3%), a sign every month leans up, and the edge isn't year-round — the stock has trailed the S&P 500 in April. Its roughest month on record was a −22.4% January in 2016 — a reminder of how hard even a seasonal name can fall.
One run worth flagging just ended: a 6-year streak of positive Novembers was snapped by a −17.1% close in 2025. The pattern has softened of late, November's last five years slipping below its longer-run record.
For a stock this dependable in November, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on.
Short answers on the stock's best month (November), its worst (June), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2016 its best month (November, +8.1%) has run well ahead of its worst (June, +1.3%) — the heatmap above shows how steady that gap has been year to year.
November has been the strongest, averaging +8.1% and closing higher in 8 of 10 years since 2016.
It's the weakest month, but it has still averaged a small gain (+1.3%) — quiet rather than genuinely bad.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade