Does Fortinet (FTNT) stock go up or down depending on the month?
Fortinet month by month, year by year
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +2.3% | -2.7% | +3.4% | +3.2% | +63.6% | +11.3% | +5.4% | |||||
| 2025 | +6.8% | +7.1% | -10.9% | +7.8% | -1.9% | +3.9% | -5.5% | -21.2% | +6.7% | +2.8% | -6.1% | -2.1% |
| 2024 | +10.2% | +7.2% | -1.2% | -7.5% | -6.1% | +1.6% | -3.7% | +32.2% | +1.1% | +1.4% | +20.8% | -0.6% |
| 2023 | +7.1% | +13.6% | +11.8% | -5.1% | +8.4% | +10.6% | +2.8% | -22.5% | -2.5% | -2.6% | -8.1% | +11.4% |
| 2022 | -17.3% | +15.9% | -0.8% | -15.4% | +1.8% | -3.8% | +5.4% | -18.4% | +0.9% | +16.3% | -7.0% | -8.0% |
| 2021 | -2.6% | +16.6% | +9.2% | +10.8% | +7.0% | +9.0% | +14.3% | +15.8% | -7.3% | +15.2% | -1.3% | +8.2% |
| 2020 | +8.1% | -11.5% | -0.9% | +6.5% | +29.2% | -1.4% | +0.8% | -4.6% | -10.8% | -6.3% | +11.7% | +20.5% |
| 2019 | +8.7% | +13.4% | -3.3% | +11.3% | -22.4% | +6.0% | +4.5% | -1.4% | -3.1% | +6.3% | +28.9% | +1.6% |
| 2018 | +5.4% | +9.6% | +6.2% | +3.3% | +10.6% | +2.0% | +0.7% | +33.1% | +10.1% | -10.9% | -10.2% | -4.6% |
| 2017 | +10.5% | +12.3% | +2.7% | +1.7% | +0.9% | -4.8% | -1.5% | +3.5% | -6.2% | +9.9% | +6.7% | +3.9% |
| 2016 | -9.6% | +0.9% | +7.9% | +6.0% | +5.2% | -7.6% | +9.8% | +4.2% | +2.2% | -13.3% | -6.1% | +0.0% |
| 2015 | -2.4% | +12.4% | +4.0% | +8.0% | +6.1% | +3.2% | +15.5% | -11.7% | +0.8% | -19.2% | +4.8% | -13.5% |
| 2014 | +10.7% | +9.2% | -4.8% | -0.2% | +2.0% | +12.0% | -2.4% | +5.1% | -2.1% | +3.2% | +5.8% | +11.3% |
| 2013 | +2.5% | -2.1% | -24.3% | +7.2% | -9.1% | +21.4% | -6.8% | +2.3% | -0.5% | -15.1% | +12.0% | |
| Average | +2.9% | +7.6% | +1.5% | +0.4% | +8.0% | +2.4% | +4.8% | +0.6% | -0.6% | +0.2% | +1.9% | +3.1% |
| % of years up | 69% | 86% | 50% | 64% | 79% | 64% | 71% | 46% | 54% | 54% | 46% | 54% |
| Years observed | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 |
Fortinet month by month: the summary
Over 2013-2026, here's what Fortinet (FTNT) stock did each month, on average: January +2.9% (up 69% of 13 years), February +7.6% (up 86% of 14 years), March +1.5% (up 50% of 14 years), April +0.4% (up 64% of 14 years), May +8.0% (up 79% of 14 years), June +2.4% (up 64% of 14 years), July +4.8% (up 71% of 14 years), August +0.6% (up 46% of 13 years), September -0.6% (up 54% of 13 years), October +0.2% (up 54% of 13 years), November +1.9% (up 46% of 13 years), December +3.1% (up 54% of 13 years). In other words, FTNT historically rose in January, February, March, April, May, June, July, August, October, November, December, and fell in September.
Does Fortinet really go up in May?
Over 2013-2026, May is Fortinet's strongest month: +8.0% on average, positive in 11 of 14 years. At the other end, September shows -0.6%. But a monthly gap is often built on one or two extreme years — the table above shows it: look at the spread, not just the average. Seasonality only means something when it has a cause (selling season, earnings calendar, year-end tax effects); with no identified cause, it's probably noise.
Frequently asked questions
Does Fortinet stock go up or down in February?
Over 14 years, FTNT rose +7.6% on average in February, finishing the month up 12 times out of 14 (86%). Median: +9.4%. It's one of its most consistent months. ⚠️ 14 years of data is not a prediction.
Does Fortinet stock go up or down in August?
Over 13 years, FTNT rose +0.6% on average in August, finishing the month up 6 times out of 13 (46%). Median: -1.4%. Results are split year to year — there's no clear pattern. ⚠️ 13 years of data is not a prediction.
Does Fortinet stock go up or down in July?
Over 14 years, FTNT rose +4.8% on average in July, finishing the month up 10 times out of 14 (71%). Median: +3.7%. It's one of its most consistent months. ⚠️ 14 years of data is not a prediction.
Does Fortinet stock go up or down in December?
Over 13 years, FTNT rose +3.1% on average in December, finishing the month up 7 times out of 13 (54%). Median: +1.6%. Results are split year to year — there's no clear pattern. ⚠️ 13 years of data is not a prediction.
Does Fortinet stock go up or down in January?
Over 13 years, FTNT rose +2.9% on average in January, finishing the month up 9 times out of 13 (69%). Median: +6.8%. Results are split year to year — there's no clear pattern. ⚠️ 13 years of data is not a prediction.
Does Fortinet stock go up or down in June?
Over 14 years, FTNT rose +2.4% on average in June, finishing the month up 9 times out of 14 (64%). Median: +2.6%. Results are split year to year — there's no clear pattern. ⚠️ 14 years of data is not a prediction.
What is the best month to buy Fortinet stock?
Historically, May: over the last 14 years, FTNT gained +8.0% on average that month and finished up 79% of the time (14 years observed). September is the weakest month (-0.6%). This is not a prediction: 14 years is a small sample, and the past is under no obligation to repeat.
Why does Fortinet stock often rise in May?
May has averaged as its best month over 14 years (+8.0%, up 79% of years). No clearly established recurring seasonal driver explains this month — it's a statistical tendency over 14 years of history, not a prediction.
Is there a best month to invest in the stock market in general?
There's no universal rule: every stock has its own seasonality. For FTNT it's May (+8.0% on average over 14 years) — another stock will look completely different. The calendar effects people cite ("sell in May", the year-end rally) are market-wide averages, not laws: on FTNT, February is the most consistent month (86% positive years). We also rank all 12 months for the whole market.
Does stock seasonality actually work?
Careful. A month that rose 14 times out of 14 can simply be chance: with 12 months and a dozen years, patterns appear naturally even in random data. Seasonality describes what happened; it doesn't explain why and predicts nothing. Treat it as context, never as a standalone buy signal.
What data is this table based on?
On FTNT's real monthly closing prices from 2013 to 2026 (14 years), source Yahoo Finance. Each cell = the price change over that month. Price performance, excluding dividends. Incomplete months and quote gaps are excluded.