The financial firms victimized in the Sept.11 attacks on the World Trade Center are continuing to claw their way back.

Euro Brokers Inc., the inter-dealer subsidiary of Maxcor Financial Group Inc. have re-established all key New York-based brokerage operations. The company is operating out of temporary headquarters provided by Prudential Securities.

Sandler O’Neill & Partners, L.P., a full-service investment banking firm specializing in financial services companies, have hired 13 new people and established a new headquarters in midtown Manhattan. Currently, the firm is operating out of temporary locations in Manhattan and branch offices in Boston, Chicago, Memphis and San Francisco.

Another investment bank that was hammered in the attacks, Keefe, Bruyette & Woods Inc., a brokerage firm specializing in the financial services sector, has made key appointments in its research and trading departments. It has hired a new director of research, a director of equity trading and a new senior VP of research. Three new hires to the research department are coming from rival CIBC World Markets in New York.

The small firm lost 67 employees in the attack. Sandler O’Neill lost 66 employees in the attack, and it currently has 118 employees. Euro Brokers lost 60 people.