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...cumentation) to determine how Alpha Vantage's data is adjusted. Here are my findings: -It seems that Alpha Vantage's OHLC data are unadjusted, and the adjusted close column provided is adjusted for splits, and split-adjusted dividends. -If I use AV's adjusted close column to adjust my OHCL data, my data will be adjusted for splits, and split-adjusted dividends. (So, I can use adjustOHLC(), with argument use.Adjusted = TRUE to adjust for splits, and split-adjusted dividends) Evidence: ### library(quantmod) #AV data getSymbols("AAPL",src = "av" ,api.key = my_api_...