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If spy and efa have the same length, you can use Transpose: Export["data.xls", Transpose[Join @@ Transpose /@ {spy, efa}]] Update: If spy and efa have different lengths, you can use PadRight before the outermost Transpose: d1 = FinancialData["SPY", "Jan.1,2012"]; d2 = FinancialData["EFA", "Jan.1,2012"]; spyb = Prepend[d1[[;; 10]], {, "SPY"}]; efab = ...

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