Outsourced trading solutions firm, Tourmaline Partners, has expanded its global team with the addition of two new hires from Jefferies and T. Rowe Price, The TRADE can reveal.
Aaron Hantman
The hires span both Europe and Asia and sees Stephen St. Pierre join the firm as a managing director, trading, to support the firm’s growth.
St. Pierre brings more than two decades of buy- and sell-side trading experience to his new role, and joins from Jefferies, where he worked in the firm’s outsourced trading unit.
The hires also include Michael Ward, who joins Tourmaline as a managing director, Asia trading, based in Sydney.
Ward joins the firm from T. Rowe Price, where he worked across Japanese and Australian trading for more than 10 years, an area he is set to continue to focus on in his position at Tourmaline.
Previously in his career, Ward has also held various senior positions across sales trading and hedge fund sales at Citi for 17 years, which he joined in 1996.
St. Pierre’s and Ward’s hires also align with the recent addition of Guillame de Chabaneix, who joined Tourmaline in October as a managing director, European trading, from BTIG.
London-based de Chabaneix supports Tourmaline’s clients trading in EMEA markets in his new role, and brings more than 15 years of industry experience to the firm.
Speaking to The TRADE on the appointments, Aaron Hantman, chief executive and founder of Tourmaline, said: “Expanding our global franchise with seasoned, regional talent will help us to meet the growing demand we have seen in all major regions. The recent contraction of players within the outsourced trading community has accelerated that growth.
“There are only a few leading players in the industry. Clients are recognising that paradigm and onboarding at Tourmaline for enhanced trading access, influence in local markets, high-quality execution, and the very best operational expertise.”
The appointments also follow further hires for Tourmaline over the course of 2025, with the firm confirming that more additions to the global team are “on the horizon.”
In April, Jeff Zuckerman rejoined Tourmaline to take up a managing director role, four years after departing the firm to serve as an executive director within Wells Fargo’s outsourced trading group in 2021.
Tourmaline also expanded its global footprint to Dubai in early 2025, with more personnel set to join the regional team in Q1 2026.