| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | KOPN | SPY | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · ytd | +9.0% | −13.3% | +1.8% | +98.2% | +28.0% | −21.5% | −29.5% | — | — | — | — | — | +35.0% | +7.5% | +27.5pp |
| 2025 | +27.9% | −20.7% | −32.4% | +37.3% | +0.0% | +19.5% | +17.0% | +17.3% | +15.7% | +42.4% | −29.5% | −4.1% | +72.1% | +17.7% | +54.3pp |
| 2024 | −11.8% | +46.4% | −31.3% | −56.3% | +2.0% | +4.7% | +26.2% | −8.8% | −24.5% | +6.8% | +51.3% | +15.3% | −33.0% | +24.9% | −57.9pp |
| 2023 | −3.2% | −4.2% | −5.2% | −4.6% | +108.7% | −0.9% | −11.2% | −23.6% | −16.4% | +0.8% | +23.6% | +33.6% | +63.7% | +26.2% | +37.5pp |
| 2022 | −28.1% | −10.2% | −4.2% | −36.8% | −30.6% | +0.9% | +58.0% | −22.6% | −23.4% | +2.9% | +50.0% | −23.5% | −69.7% | −18.2% | −51.5pp |
| 2021 | +109.9% | +63.9% | +25.5% | −21.6% | −1.5% | +1.0% | −17.6% | −12.8% | −12.8% | +2.1% | −0.4% | −21.6% | +68.3% | +28.7% | +39.6pp |
| 2020 | +2.2% | −22.9% | +10.5% | +46.0% | +103.9% | +27.9% | +51.1% | −24.9% | −8.6% | −13.8% | +68.1% | +21.5% | +505.8% | +18.3% | +487.5pp |
| 2019 | +38.1% | +10.9% | −12.4% | −6.7% | −8.0% | −5.2% | +6.4% | −20.1% | −26.8% | −17.9% | −9.6% | −20.4% | −59.8% | +31.2% | −91.1pp |
| 2018 | +3.7% | −7.8% | +2.0% | +6.1% | +6.6% | −19.0% | +7.0% | −24.2% | +4.3% | −7.9% | −25.6% | −39.8% | −68.8% | −4.6% | −64.2pp |
| 2017 | +12.3% | +10.7% | +16.1% | −0.5% | −15.4% | +7.5% | +2.4% | +5.8% | +3.7% | −15.8% | −8.3% | −0.6% | +12.7% | +21.7% | −9.0pp |
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. KOPN 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.
