Subject: File No. 10-222
From: Aran Cook

December 14, 2015

Hello,

I would urge you to approve IEX application to become registered as a NSE.

I would consideruse the IEX router to eliminate the possibility of having your orders impacted by certain types of speed-enabled trading strategies (aka latency arbitrage)

I believe strongly in having a true alternative choice when it comes to selecting which medium I place my investment with. I work for a building society in the UK, the worlds largest, nationwide, where we offer an alternative option to the banks.

Please approve, I don't see any credible reason why you wouldn't.