Assignment of Assignor's Interest

Recorded: 2011-03-18 Pages: 6

Assignors

FERGUSON, RALPH BRUCE

Executed: 2006-03-24

CHEUNG, LIAM

Executed: 2006-03-23

BOYD, RONALD SCOTT

Executed: 2006-03-24

Assignee

PENSON WORLDWIDE, INC.

1700 PACIFIC AVENUE, SUITE 1400, DALLAS, TEXAS, 75201

Covered Properties (2)

Modeling Financial Instruments Using Bid and Ask Prices

Patent: 8,090,644 →

Application: 12/418,951 →

Publication: US 2009/0192949

Modeling Financial Instruments Using Bid and Ask Prices

Patent: 8,156,035 →

Application: 12/422,615 →

Publication: US 2009/0198634