Subject: File No. S7-27-09
From: William A. Thayer
Affiliation: retired Certified Financial Planner

November 17, 2009

I strongly support the SEC effort to make the "dark pools" visible to the public. If this is not done, we will have a two tier market. Furthermore, if the trades are not made public, it is a great opportunity for parties to make a secret profit that would not be taxed.