Among SPY and IOO, IOO had the best month last year in September 2025, returning 6.1%.
| ASSET | MONTH | % RETURN |
|---|---|---|
IOO | January 2025 | 0.84% |
SPY | January 2025 | 2.11% |
SPY | February 2025 | 0.25% |
IOO | February 2025 | 1.53% |
IOO | March 2025 | -6.02% |
SPY | March 2025 | -5.89% |
SPY | April 2025 | -0.52% |
IOO | April 2025 | 0.26% |
SPY | May 2025 | 5.18% |
IOO | May 2025 | 5.63% |
SPY | June 2025 | 5.43% |
IOO | June 2025 | 5.82% |
SPY | July 2025 | 2.55% |
IOO | July 2025 | 3.76% |
SPY | August 2025 | 2.99% |
IOO | August 2025 | 3.94% |
SPY | September 2025 | 4.79% |
IOO | September 2025 | 6.15% |
SPY | October 2025 | 2.85% |
IOO | October 2025 | 5.29% |
SPY | November 2025 | -0.33% |
IOO | November 2025 | -0.06% |
IOO | December 2025 | 0.65% |
SPY | December 2025 | 0.76% |