Investment Technology Group, a research and technology firm, has added four executives to its top brass. David Stevens was promoted to head of US and Latin America, based in New York. Stevens was most recently chief executive of ITG's Asia Pacific business. He will retain oversight of that region. Jamie Selway has been named ITG's Head of Liquidity Management and derivatives business. Selway was formerly the chief economist at Archipelago. Jeff Bacidore is joining ITG as head of algorithms, reporting to Selway. Bacidore joins from Goldman Sachs. Ralph Edwards has joins from Sanford C. Bernstein, and will become ITG's derivatives strategist.