| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | ASPN | SPY | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · ytd | +19.1% | −7.4% | +9.6% | +8.5% | +72.5% | −0.9% | −35.5% | — | — | — | — | — | +44.5% | +7.5% | +37.0pp |
| 2025 | −1.6% | −34.9% | −16.0% | −15.5% | +6.7% | +2.8% | +29.4% | −10.7% | +1.8% | +17.0% | −60.4% | −12.1% | −76.2% | +17.7% | −93.9pp |
| 2024 | −28.8% | +53.0% | +2.4% | −11.0% | +91.1% | −20.3% | −14.4% | +40.6% | −3.5% | −35.6% | −17.0% | −19.7% | −24.7% | +24.9% | −49.6pp |
| 2023 | −10.9% | +3.3% | −31.3% | −16.0% | +5.0% | +20.1% | +5.7% | −27.0% | +41.2% | −10.2% | +35.8% | +50.6% | +33.8% | +26.2% | +7.7pp |
| 2022 | −40.3% | −0.3% | +16.5% | −37.4% | −18.9% | −43.6% | +32.4% | −0.5% | −29.1% | +37.5% | −4.9% | −2.2% | −76.3% | −18.2% | −58.1pp |
| 2021 | +20.2% | +10.9% | −8.6% | −10.4% | +11.2% | +47.5% | +25.8% | +16.2% | +5.2% | +18.4% | +5.0% | −12.9% | +198.3% | +28.7% | +169.6pp |
| 2020 | +6.6% | −3.9% | −22.8% | −8.8% | +10.7% | +6.1% | −3.5% | +33.9% | +28.8% | +3.2% | +25.0% | +18.2% | +115.1% | +18.3% | +96.7pp |
| 2019 | +27.7% | +27.2% | −26.3% | +60.4% | +19.8% | +45.5% | −7.4% | −8.5% | −2.0% | −1.5% | +16.8% | +14.0% | +264.3% | +31.2% | +233.1pp |
| 2018 | +3.5% | −8.9% | −7.2% | +5.4% | +11.6% | −2.4% | +3.7% | −4.7% | −5.6% | −21.7% | −6.1% | −36.6% | −56.4% | −4.6% | −51.8pp |
| 2017 | +12.8% | −11.2% | +0.2% | −2.2% | +11.3% | −1.5% | +3.6% | −11.3% | +6.4% | +3.0% | +6.5% | +2.3% | +18.2% | +21.7% | −3.5pp |
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. ASPN 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.
