Mr. David A. Stawick
Secretary
Commodity Futures Trading Commission
Three Lafayette Centre
1155 21st Street, N.W.
Washington DC 20581

Ms. Elizabeth M. Murphy
Secretary
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549-1090

Re: Definitions / File Number S7-16-10

Dear Mr. Stawick and Ms. Murphy:

The Asset Management Group (the “AMG”) of the Securities Industry and Financial Markets Association (“SIFMA”) appreciates the opportunity to supplement our letter to the Commodity Futures Trading Commission (the “CFTC”) and the Securities and Exchange Commission (the “SEC” and, together with the CFTC, the “Commissions”) dated September 20, 2010 (the “AMG Letter”) and provide the Commissions with additional comments regarding issues raised during a November 1, 2010 meeting held among members of the respective staffs of the Commissions and representatives of the AMG.

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