标普500指数 - SERP Analysis

https://www.spglobal.com/spdji/zh/indices/equity/sp-500/

https://cn.investing.com/indices/us-spx-500

https://wuu.wikipedia.org/wiki/%E6%A0%87%E5%87%86%E6%99%AE%E5%B0%94500%E6%8C%87%E6%95%B0

https://zh.wikipedia.org/zh-hans/S%26P_500

https://cn.tradingview.com/symbols/SPX/

https://stock.finance.sina.com.cn/usstock/quotes/.INX.html

https://www.spglobal.com/spdji/zh/landing/investment-themes/the-500/

https://hk.finance.yahoo.com/quote/%5EGSPC/

https://cn.investing.com/indices/us-spx-500-historical-data