The Trade Desk stock falls after Amazon offers free DSP testing

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 253.62 -0.46 (0.18%)
Previous Close $254.08    52 Week High $847.21 
Open $250.89    52 Week Low $474.00 
Day High $254.56    P/E 429.86 
Day Low $248.65    EPS $0.59 
Volume 14,248,413       

(NASDAQ: TTD) Delayed: 13.06 +0.88 (7.22%)
Previous Close $12.18    52 Week High $33.40 
Open $12.20    52 Week Low $22.00 
Day High $13.06    P/E N/A 
Day Low $12.20    EPS $0.00 
Volume 9,255,500