| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | ATRO | SPY | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · ytd | +39.7% | +6.4% | −17.2% | +7.0% | +21.8% | −6.6% | −19.8% | — | — | — | — | — | +20.1% | +7.5% | +12.6pp |
| 2025 | +10.9% | +13.1% | +20.8% | −6.1% | +37.6% | +7.2% | +7.9% | +0.7% | +25.4% | +7.8% | +11.0% | −0.6% | +239.8% | +17.7% | +222.1pp |
| 2024 | −2.9% | +13.4% | −0.7% | −11.9% | +22.6% | −2.6% | +15.0% | −2.6% | −13.1% | −10.7% | −7.1% | −1.2% | −8.4% | +24.9% | −33.3pp |
| 2023 | +44.2% | +2.6% | −12.3% | +10.3% | +7.9% | +24.9% | +5.6% | −16.4% | −9.5% | −3.3% | −3.1% | +17.3% | +69.1% | +26.2% | +43.0pp |
| 2022 | +0.2% | +22.3% | −12.1% | −25.1% | +8.4% | −3.1% | +10.3% | −17.9% | −14.7% | +17.8% | −9.3% | +22.6% | −14.2% | −18.2% | +4.0pp |
| 2021 | −5.8% | +26.8% | +14.2% | −3.5% | −2.6% | +3.2% | −2.5% | −21.8% | +5.2% | −8.3% | −18.9% | +14.7% | −9.3% | +28.7% | −38.0pp |
| 2020 | −9.8% | −19.6% | −54.7% | −2.2% | +1.7% | +15.7% | −17.6% | +3.9% | −14.6% | −17.1% | +78.4% | +15.8% | −52.7% | +18.3% | −71.0pp |
| 2019 | +0.7% | +17.3% | −9.0% | +1.9% | +22.0% | −1.1% | −8.4% | −25.3% | +6.8% | −1.5% | +0.7% | −4.1% | −8.2% | +31.2% | −39.4pp |
| 2018 | +7.5% | −13.6% | −3.2% | −1.9% | −3.8% | +2.2% | +14.0% | +6.1% | −0.0% | −20.8% | +11.3% | −6.2% | −13.2% | −4.6% | −8.6pp |
| 2017 | −3.0% | +2.1% | −5.3% | +2.5% | −5.9% | −0.4% | −4.0% | −10.1% | +13.2% | +15.6% | +20.6% | −0.0% | +22.5% | +21.7% | +0.8pp |
A month’s return is its month-end close over the prior month-end’s, so a year’s figure is exactly the product of its twelve monthly cells — no separate annualisation, no resampling. A blank cell means no return exists for that month (the series had not started, or it is the very first month-end, which has nothing to be measured against). Blank is never zero.
Basis. ATRO is on the total return (splits + dividends) basis, SPY on the total return (splits + dividends) basis. Both columns are on the same basis, so the Δ column is a like-for-like difference.
Partial years. A year marked “ytd” or “part” does not cover the full calendar year: either the stored history starts inside it (the figure is measured from the first month-end present) or the data stops before December (the figure runs through the last stored close). The row’s own tooltip names the exact boundary. It is never dressed up as a calendar-year return.
End of day. These are stored end-of-day closes, and the window is anchored on the LAST stored bar rather than today’s date — so the newest row ends where the data ends. Nothing here is intraday.
