SSN 0.00% 1.5¢ samson oil & gas limited

rookie question

  1. 159 Posts.
    hey guys could someone please explain this to me;

    10:25:09 AM 0.135 4,000
    10:09:14 AM 0.135 -5,000
    10:08:46 AM 0.135 4,690
    10:08:46 AM 0.135 35,310

    This is from SSN's market depth this morning, I understand that a trade is both a buy and a sell so how does the (-) come into play?

    Cheers,

    B.
 
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