The Trade Desk stock falls after Amazon offers free DSP testing

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 263.37 +0.92 (0.35%)
Previous Close $262.45    52 Week High $847.21 
Open $264.08    52 Week Low $474.00 
Day High $265.34    P/E 446.39 
Day Low $260.42    EPS $0.59 
Volume 19,843,399       

(NASDAQ: TTD) Delayed: 12.63 +0.37 (3.02%)
Previous Close $12.26    52 Week High $33.40 
Open $12.35    52 Week Low $22.00 
Day High $12.74    P/E N/A 
Day Low $12.33    EPS $0.00 
Volume 6,039,019