Subject: File No. SR-CHX-2011-21
From: stephen floirendo

August 23, 2011

To whom it may concern,

Being in the option industry for more than 20 years, I feel that for the protection of the customers as well as the market providers , that when an error occurs (strike price, quantity, price, delta, etc)and both parties agree to either reduce or cancel a portion of the trade that the stock that correlates to that reduction or cancellation , should be taken down without painting the tape with a zero-balance stock transaction. The CHX current rule set is inadequate regarding this fact and the proposed rule change is a necessary step to ensure investors confidence and faith in the market place.

Stephen Floirendo
Husky Trading