| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | BXP | SPY | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · ytd | −4.2% | −11.0% | −8.6% | +12.6% | +2.7% | +11.7% | +8.1% | — | — | — | — | — | +8.8% | +9.3% | −0.5pp |
| 2025 | −1.6% | −3.0% | −3.9% | −5.1% | +5.6% | +1.7% | −3.0% | +10.8% | +3.5% | −4.2% | +1.6% | −5.8% | −4.7% | +17.7% | −22.5pp |
| 2024 | −5.2% | −2.7% | +2.6% | −5.2% | −2.0% | +3.1% | +15.8% | +5.5% | +8.3% | +0.1% | +1.8% | −8.1% | +12.3% | +24.9% | −12.6pp |
| 2023 | +10.3% | −12.2% | −15.8% | −1.4% | −8.8% | +20.4% | +15.7% | +0.2% | −9.4% | −9.9% | +6.3% | +25.0% | +11.0% | +26.2% | −15.2pp |
| 2022 | −2.7% | +9.1% | +6.1% | −8.7% | −5.5% | −19.1% | +2.4% | −12.9% | −4.4% | −3.0% | −0.9% | −4.8% | −38.6% | −18.2% | −20.4pp |
| 2021 | −3.4% | +8.6% | +3.1% | +8.0% | +7.5% | −1.7% | +2.4% | −3.7% | −3.3% | +4.9% | −5.1% | +7.7% | +26.2% | +28.7% | −2.5pp |
| 2020 | +4.0% | −10.1% | −27.7% | +5.4% | −11.5% | +6.3% | −1.4% | −2.5% | −6.5% | −9.8% | +35.6% | −2.7% | −28.3% | +18.3% | −46.7pp |
| 2019 | +17.2% | +0.6% | +1.6% | +2.8% | −4.9% | −0.7% | +3.1% | −3.4% | +1.7% | +5.8% | +1.0% | +0.2% | +26.1% | +31.2% | −5.1pp |
| 2018 | −4.9% | −3.9% | +4.4% | −1.5% | +0.3% | +3.7% | +0.1% | +3.9% | −4.9% | −1.9% | +8.6% | −13.5% | −10.9% | −4.6% | −6.3pp |
| 2017 | +4.1% | +6.2% | −4.2% | −4.4% | −4.2% | +2.0% | −1.7% | −0.3% | +2.5% | −1.4% | +3.5% | +4.4% | +5.9% | +21.7% | −15.8pp |
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. BXP 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.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Years ⓘ | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Positive ⓘ | 48% | 38% | 57% | 62% | 29% | 48% | 81% | 48% | 52% | 43% | 57% | 67% |
| Median | −0.1% | −1.8% | +2.5% | +2.3% | −2.5% | −0.2% | +2.4% | −0.3% | +1.7% | −1.9% | +1.6% | +2.2% |
| Best | +17.2% | +9.1% | +11.9% | +41.1% | +7.5% | +20.4% | +15.8% | +14.5% | +9.0% | +11.1% | +35.6% | +25.0% |
| Worst | −21.3% | −14.3% | −27.7% | −8.7% | −11.5% | −19.1% | −7.5% | −12.9% | −14.1% | −24.3% | −24.7% | −13.5% |
| vs SPY ⓘ | +2.3pp | −2.1pp | −0.2pp | +0.1pp | −3.0pp | +0.1pp | +1.6pp | −0.5pp | −0.1pp | −2.1pp | −2.6pp | +0.9pp |
252 monthly observations across 2005–2026, benchmark SPY. The highlighted column is the current calendar month. Months are calendar months, not rolling 30-day windows.
