The Trade Desk stock falls after Amazon offers free DSP testing

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 249.80 -4.28 (1.68%)
Previous Close $254.08    52 Week High $847.21 
Open $250.89    52 Week Low $474.00 
Day High $250.89    P/E 423.39 
Day Low $248.65    EPS $0.59 
Volume 3,817,520       

(NASDAQ: TTD) Delayed: 12.59 +0.41 (3.37%)
Previous Close $12.18    52 Week High $33.40 
Open $12.25    52 Week Low $22.00 
Day High $12.60    P/E N/A 
Day Low $12.20    EPS $0.00 
Volume 1,583,470