如果今天漲或跌不多的話，based on SPX OE DAY DATA， 這個月將是曆史上 top 5 monthly OE gainer (from prior OE to this OE, 假設option was available then and it's the third Friday or 3rd Thursday if 3rd Friday was not a trading day, like 2025-04)
＊這個月用的是周四收盤價。
to be complete, this was the top x loser.
