| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | ATOS | SPY | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · ytd | −4.2% | −47.6% | +18.7% | +2.1% | −2.6% | −63.1% | +19.7% | — | — | — | — | — | −73.9% | +7.5% | −81.4pp |
| 2025 | −10.8% | −9.1% | −12.1% | +33.7% | −13.7% | +6.8% | +0.0% | −8.1% | +14.0% | +2.3% | −12.6% | −24.1% | −37.5% | +17.7% | −55.2pp |
| 2024 | −3.0% | +14.4% | +84.2% | −16.1% | −13.9% | −8.5% | +13.4% | +1.5% | +10.9% | −9.2% | −5.8% | −27.4% | +7.3% | +24.9% | −17.6pp |
| 2023 | +51.5% | −7.6% | −2.7% | −11.1% | +45.3% | +35.5% | −12.7% | −28.2% | −6.3% | −9.5% | +10.4% | +18.9% | +66.5% | +26.2% | +40.3pp |
| 2022 | −14.4% | −10.9% | +2.5% | −19.2% | −3.7% | +12.1% | −13.8% | −2.1% | −9.8% | +18.7% | −23.9% | −29.5% | −67.0% | −18.2% | −48.8pp |
| 2021 | +132.6% | +23.1% | −22.4% | +10.4% | +38.2% | +96.3% | −52.7% | +27.1% | −14.2% | −21.2% | −11.7% | −29.5% | +68.4% | +28.7% | +39.7pp |
| 2020 | −5.7% | −18.2% | +9.9% | +63.9% | +9.2% | +59.7% | −0.5% | −32.5% | −5.1% | −38.4% | +18.1% | −46.0% | −39.5% | +18.3% | −57.8pp |
| 2019 | +27.5% | +13.1% | +139.5% | −15.1% | −14.4% | −0.4% | −18.4% | −4.3% | −1.5% | −18.9% | −14.5% | +15.4% | +53.9% | +31.2% | +22.7pp |
| 2018 | +204.2% | −17.5% | −32.4% | +882.1% | −26.7% | −31.5% | +2.7% | −5.3% | −18.2% | −25.1% | −13.0% | −10.5% | +287.8% | −4.6% | +292.4pp |
| 2017 | −2.8% | +5.1% | −47.2% | −22.0% | −23.8% | +10.6% | −32.0% | +26.2% | +23.5% | −20.8% | −21.4% | −20.3% | −81.3% | +21.7% | −103.1pp |
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. ATOS is on the price only (split-adjusted close; dividends NOT included) basis, SPY on the total return (splits + dividends) basis. THE TWO DIFFER: one series includes dividends and the other does not, so the Δ column flatters whichever one is on the total-return basis. Read it with that in mind — the bases are printed rather than silently reconciled.
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.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Years ⓘ | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 14 |
| Positive ⓘ | 43% | 50% | 43% | 43% | 36% | 57% | 21% | 38% | 31% | 15% | 31% | 29% |
| Median | −2.9% | −1.2% | −4.5% | −13.1% | −7.8% | +8.7% | −9.2% | −3.2% | −5.1% | −18.9% | −12.6% | −22.2% |
| Best | +204.2% | +64.1% | +139.5% | +882.1% | +45.3% | +96.3% | +19.7% | +886.9% | +23.5% | +18.7% | +31.3% | +58.9% |
| Worst | −19.7% | −47.6% | −47.2% | −27.2% | −33.2% | −63.1% | −52.7% | −32.5% | −27.0% | −68.7% | −23.9% | −46.0% |
| vs SPY ⓘ | −4.6pp | −1.9pp | −5.5pp | −11.3pp | −7.9pp | +5.8pp | −12.9pp | −0.9pp | −1.4pp | −21.1pp | −12.8pp | −22.6pp |
164 monthly observations across 2012–2026, benchmark SPY. The highlighted column is the current calendar month. Months are calendar months, not rolling 30-day windows.
