Wall Street ended the week on a negative note, with the Dow Jones Industrial Average falling by triple digits for a second straight day and other major benchmarks suffering declines of as much as 1.2%. The latest news on the employment front seemed to be the catalyst for the downward move, as initial optimism about future U.S. economic prospects gave way to nervousness about possible responses from the Federal Reserve to rein in the economy before it overheats. Some poor showings from certain individual stocks also weighed on investor sentiment. Tesla (NASDAQ:TSLA), Delphi Technologies (NYSE:DLPH), and II-VI (NASDAQ:IIVI) were among the worst performers on the day. Here's why they did so poorly.
 
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