On April 15, 2011, at 1:00 p.m. EDT, Chairman Gensler and Commission staff participated in a meeting with representatives of Blue Mountain, Citadel, Delta, D.E. Shaw, DRW and Tudor. Topics discussed included implementation and sequencing of Dodd-Frank final rules, open access to derivatives clearing organizations, straight-through processing for cleared swaps, margin requirements for cleared swaps, segregation of collateral for cleared swap positions, and the process for mandatory clearing determinations. Industry representatives provided several documents (attached).