TradingChart[{"MSFT",{{2009,1,1},{2009,3,31}}},{"Open"}]

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {Related Indicator Types:  (RefLink[Close, paclet:ref/indicator/Close])  ▪  (RefLink[High, paclet:ref/indicator/High])  ▪  (RefLink[Low, paclet:ref/indicator/Low])  ▪  (RefLink[Volume, paclet:ref/indicator/Volume])}})}})