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Technology Stocks : Amazon.com, Inc. (AMZN)
AMZN 233.22+1.8%Nov 28 9:30 AM EST
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To: M. Frank Greiffenstein who wrote (21599)10/14/1998 9:52:00 PM
From: umbro  Read Replies (2) of 164684
 
open interest can be increased by (ratail) buying or selling.

If I "buy 10 calls to open", then I've increased the open
interest. Just because a market maker might be on the
ohter side, selling me the calls, doesn't change the fact
that the open interest increased. When I "sell 10 calls to close",
I'm decreasing the open interest.

Open interest can't tell us if the retail client bought or sold.
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