Subject: File No. SR-NASDAQ-2011-131
From: Mark Roszak

October 4, 2011

To whom it may concern:

I believe the Commission is dealing with the issue reactively instead of proactively. What I mean by this is that the Commission needs to address the cause of the "flash crash," instead of trying to control it once it has already has happened. Its clear that the "flash crash" was precipitated by high frequency traders. Proper regulation of high frequency traders, such as limiting connection speeds to exchange matching engines, would help prevent another "flash crash." Limiting connection speeds would slow the market down and would likely curb extreme fluctuations. I understand this would decrease the overall liquidity of market, but i believe the trade-off is acceptable. Without proactive regulation, I believe the proposed regulations would be effective without substantial trade-off. Although, I hope the Commission will take this opportunity to address the real cause of the "flash crash." Thanks for your time.


Mark Roszak