If I had bought SPY
If I had bought SPY
Dates within the last week use the minute candle — accurate to the minute of purchase.
Ready examples: $100 put into SPY
a week ago+0.0%$100 → $100
a month ago+3.0%$100 → $103
three months ago+2.2%$100 → $102
six months ago+10.7%$100 → $111
a year ago+18.8%$100 → $119
since our history starts, July 3, 2025+21.6%$100 → $122
Dates within the last week use the minute candle — accurate to the minute of purchase.
A year of buying SPY
Over the last 364 days SPY closed between $626.71 (September 1, 2025) and $778.67 (August 13, 2026). One hundred dollars put in at the low would be worth $123 today; at the high, $99. The current price $767.79 is above 349 of those 364 daily closes, so a purchase on a random day of that stretch would be in profit 96% of the time — fees aside.
A typical day moves SPY by 0.7%: a $1,000 position swings about $7 a day.
Low of the stretch$626.71 · $100 → $123
High of the stretch$778.67 · $100 → $99
Share of profitable dates96% · 349/364
The same calculation for neighbouring instruments
Calculators for other instruments in the “exchange-traded fund” category.