Rising on Unusual Volume

What does this mean?
SymbolNameLast TradeChangeVol. % Changeat Investors.com
RXNRexnord Corporation Common Stoc28.10 1:54PM EDTDown 0.35 (1.23%)88%Stock Checkup
ACMPAccess Midstream Partners, L.P.62.93 1:52PM EDTDown 0.71 (1.12%)70%Stock Checkup
TENTenneco Inc. Common Stock51.96 1:55PM EDTDown 0.35 (0.67%)36%Stock Checkup
EXPEagle Materials Inc Common Stoc98.84 1:55PM EDTDown 2.89 (2.84%)32%Stock Checkup
JKSJinkoSolar Holding Company Limi26.33 1:55PM EDTDown 1.16 (4.22%)19%Stock Checkup

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