The Trade Desk stock falls after Amazon offers free DSP testing

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 258.63 -1.48 (0.57%)
Previous Close $260.11    52 Week High $847.21 
Open $260.74    52 Week Low $474.00 
Day High $261.09    P/E 438.36 
Day Low $257.04    EPS $0.59 
Volume 35,713,221       

(NASDAQ: TTD) Delayed: 13.18 -0.14 (1.05%)
Previous Close $13.32    52 Week High $33.40 
Open $13.33    52 Week Low $22.00 
Day High $13.37    P/E N/A 
Day Low $13.14    EPS $0.00 
Volume 13,171,538