Subject: File No. SR-CHX-2016-20
From: David Marden

December 4, 2017

I would like to present my support for the sale of the Chicago Stock Exchange. I have researched this potential transaction quite extensively and feel the benefits greatly outweigh negative aspects. I find the presence of any national security issues to be non-existent as evidenced by the approval from CFIUS. The international company involved with the potential sale would only have 29% ownership and 20% voting rights, so their influence would be minimal. If approved, the transaction stands to create many jobs for the city of Chicago and increase the popularity of CHX internationally.