The Trade Desk stock falls after Amazon offers free DSP testing

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 265.84 +6.39 (2.46%)
Previous Close $259.45    52 Week High $847.21 
Open $260.85    52 Week Low $474.00 
Day High $266.40    P/E 450.58 
Day Low $258.58    EPS $0.59 
Volume 35,744,383       

(NASDAQ: TTD) Delayed: 13.54 +0.12 (0.89%)
Previous Close $13.42    52 Week High $33.40 
Open $13.40    52 Week Low $22.00 
Day High $13.76    P/E N/A 
Day Low $13.22    EPS $0.00 
Volume 14,824,754