What's this all about - after hours trading?


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<TABLE class=yfnc_modtitlew1 cellSpacing=0 cellPadding=2 width="100%" border=0><TBODY><TR class=yfnc_modtitle1><TD><SMALL>UNITED PARCEL SVC (NYSE:UPS) Delayed quote data</SMALL></TD><TD align=right> </TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width=1 border=0><TBODY><TR><TD height=1><SPACER height="1" width="1" type="block"></TD></TR></TBODY></TABLE><TABLE class=yfnc_modtitlew1 cellSpacing=0 cellPadding=0 width=580 border=0><TBODY><TR><TD colSpan=5><TABLE cellPadding=1 width="100%"><TBODY><TR><TD>After Hours <SMALL>(RT-ECN)</SMALL>: 81.73
0.82 (1.01%) </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>Can we put any credence in after hour trading?


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After-Hours Trading

After-hours trading refers to stock trading outside the traditional trading hours of the major exchanges, such as the New York Stock Exchange and the Nasdaq Stock Market. The traditional or regular trading hours have been for some time from 9:30 a.m. to 4:00 p.m. Eastern Time.
Trading outside these regular hours is not a new phenomenon. But it has generally been limited to high net-worth investors and institutional investors, such as mutual funds. The emergence of private trading systems, known as Electronic Communications Networks, or ECNs, has allowed individual investors to participate in after-hours trading.
While after-hours trading promises greater opportunities and convenience for individual investors, it also involves significant risk. The after-hours market can be much more volatile and far less liquid. Before considering an after-hours trade, be sure to educate yourself about the risks. For more information, read our publication, After-Hours Trading: Understanding the Risks.
You can also read a special study prepared by the staff of the SEC that discusses the impact of ECNs and after-hours trading on the securities markets.