An experienced
team at the service
of your operations

We prioritize communication and collaboration, assembling a dedicated team for each project. This approach enables us to combine availability, financial expertise, and a deep understanding of our clients' business.

Tony Hallside

Founder and SEO
Tony is the Founder and SEO of STP Partners, where he leads the firm’s vision to provide flexible, adaptable, and transparent prime brokerage services. He leverages over 15 years of experience in senior and executive roles, consistently driving business growth and building sustainable client relationships.

Tony's expertise spans new market entries, business development, and fostering partnerships across multiple jurisdictions and cultures. His leadership has been pivotal in establishing STP Partners as a trusted name in prime brokerage.

Tony holds a BA in Risk Management from Glasgow Caledonian University, as well as an LLB (Scots Law) and a Postgraduate Diploma in Legal Practice from Strathclyde University. Outside of work, he enjoys scuba diving, Formula 1, going to the gym, and spending quality time with his twin daughters.

Marcel Assaf

Head of Trading
Marcel Assaf is the Head of Trading at STP Partners, leveraging over 25 years of experience in capital markets, portfolio management, and securities trading. He leads the trading team, develops multi-asset trading strategies, and ensures compliance with regulatory standards across MENA, US, and European markets.

Before joining STP Partners, Marcel served as Head of Equities and Derivatives at FNB Capital S.A.L., providing strategic investment advisory and managing high-performing trading teams. His disciplined risk management approach has consistently delivered risk-adjusted returns for institutional and private clients.

Marcel holds a degree in Computer & Management, has an ACI Dealing Certificate, and is fluent in French, Arabic, and English. Beyond his professional responsibilities, he has a keen interest in sports and stays engaged with emerging trading technologies.

Norhan ElKhatib

Senior Operations Officer
Norhan is a Senior Operations Officer at STP Partners, managing and overseeing daily operational processes within the Prime Brokerage division. She brings over eight years of experience in global finance and investment banking to the role.

She started her career at EFG Holding, holding several roles including Analyst in Retail High Net Worth Sales, Associate in Middle Office, and Associate VP in Back-Office Operations. Her expertise includes market analysis, equity research, and optimizing liquidity management for non-DVP clients.

Norhan holds a bachelor’s degree in Finance & Investment from a joint program between Georgia State University and Cairo University, graduating with honors. She has successfully passed the CFA Level I exam and is fluent in English and Arabic. In her free time, she enjoys exploring new cuisines ad learning new languages.

Elia Salameh

Operations Manager
Elia is the Operations Manager at STP Partners, overseeing back-office operations, including settlements, financial reporting, corporate actions, and daily operational tasks. Elia ensures seamless operational workflows and supports the treasury team with cash management and financial instrument operations.

She began her career at Fidus SAL in Beirut, Lebanon, as an Execution Officer in the Back Office Department, where she managed accounting, finance, and regulatory reporting to the Central Bank of Lebanon. Prior to joining STP Partners, Elia worked at SHUAA Capital as a Senior Analyst in Operations, gaining extensive experience in operational management.

Elia holds a degree in Banking and Finance, has certifications in Financial Instruments, Combating Financial Crime and Banking Ethics, and is fluent in English, Arabic and French. In her free time, she enjoys music and reading.

Kamila Rojek

Onboarding Specialist
Kamila Rojek is the Onboarding Specialist at STP Partners, responsible for initial due diligence and onboarding of new client firms. Since joining in January 2024, Kamila has been instrumental in streamlining onboarding processes and enhancing compliance protocols.

She began her financial services career at Lloyds Banking Group (UK) in the Operations function. Kamila holds the Fundamentals of Financial Services credential from the Chartered Institute for Securities & Investment (CISI) and is pursuing the CISI International Operations Certificate. She also holds the ICA Certificate in KYC & CDD.

Kamila is fluent in Polish and English. In her free time, she enjoys fitness, personal development and reading.

Sylvain Lemaire

Sylvain Lemaire

Senior Portfolio Manager
Sylvain Lemaire is a Senior Portfolio Manager at STP Partners, leveraging over 28 years of experience in capital markets, as a Hedge Fund Portfolio Manager, and as a Senior Proprietary Trader focusing on Arbitrage Strategy.

Sylvain launched the first Long Short Market neutral Equity Fund in France in 2001 and went on to take the responsibility of the Long Short and Event Driven Strategy at Systeia Capital management in 2005. He also ran proprietary trading books at BNP Paribas arbitrage and Credit Agricole Indosuez. Sylvain is proud to have never had a single negative year all along his career. He has managed up to €700 million. Then, Sylvain spent 15 years in the sell-side Industry where he developed a strong and successful franchise at Tradition and market Securities in Dubai as a Head of Statistical and Quantitative Trading Strategy Cross Assets. He worked with the biggest European Hedge Fund.

Sylvain holds a DEA in Finance and a Master's obtained at ESCP in 1998. He is fluent in French and English. Outside of work, he enjoys sport.


Roberto Castiglioni

Director of Research
Roberto is the Director of Research at STP Partners, where he supports the trading team by leveraging his expertise in financial markets, valuation, and research methodology. He contributes to the development of multi-asset class investment strategies and helps identify asymmetric opportunities across global public markets.

He began his career at Degiro B.V. as an analyst. Prior to joining STP Partners, Roberto worked at Negma Group Investment Ltd. as a trader and analyst, where he managed the equity division’s portfolio and conducted research on special situations and underfollowed compounders for opportunistic investments.

Roberto holds a Master’s degree in Financial Risk and Data Analysis and is fluent in Italian, English, and Spanish. Outside of work, he enjoys traveling, reading, and personal development.
Sylvain Lemaire
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Tony
Hallside

Founder and SEO
Tony is the Founder and SEO of STP Partners, where he leads the firm’s vision to provide flexible, adaptable, and transparent prime brokerage services. He leverages over 15 years of experience in senior and executive roles, consistently driving business growth and building sustainable client relationships.

Tony's expertise spans new market entries, business development, and fostering partnerships across multiple jurisdictions and cultures. His leadership has been pivotal in establishing STP Partners as a trusted name in prime brokerage.

Tony holds a BA in Risk Management from Glasgow Caledonian University, as well as an LLB (Scots Law) and a Postgraduate Diploma in Legal Practice from Strathclyde University. Outside of work, he enjoys scuba diving, Formula 1, going to the gym, and spending quality time with his twin daughters.

Marcel
Assaf

Head of Trading
Marcel Assaf is the Head of Trading at STP Partners, leveraging over 25 years of experience in capital markets, portfolio management, and securities trading. He leads the trading team, develops multi-asset trading strategies, and ensures compliance with regulatory standards across MENA, US, and European markets.

Before joining STP Partners, Marcel served as Head of Equities and Derivatives at FNB Capital S.A.L., providing strategic investment advisory and managing high-performing trading teams. His disciplined risk management approach has consistently delivered risk-adjusted returns for institutional and private clients.

Marcel holds a degree in Computer & Management, has an ACI Dealing Certificate, and is fluent in French, Arabic, and English. Beyond his professional responsibilities, he has a keen interest in sports and stays engaged with emerging trading technologies.

Norhan
ElKhatib

Senior Operations Officer
Norhan is a Senior Operations Officer at STP Partners, managing and overseeing daily operational processes within the Prime Brokerage division. She brings over eight years of experience in global finance and investment banking to the role.

She started her career at EFG Holding, holding several roles including Analyst in Retail High Net Worth Sales, Associate in Middle Office, and Associate VP in Back-Office Operations. Her expertise includes market analysis, equity research, and optimizing liquidity management for non-DVP clients.

Norhan holds a bachelor’s degree in Finance & Investment from a joint program between Georgia State University and Cairo University, graduating with honors. She has successfully passed the CFA Level I exam and is fluent in English and Arabic. In her free time, she enjoys exploring new cuisines ad learning new languages.

Elia
Salameh

Operations Manager
Elia is the Operations Manager at STP Partners, overseeing back-office operations, including settlements, financial reporting, corporate actions, and daily operational tasks. Elia ensures seamless operational workflows and supports the treasury team with cash management and financial instrument operations.

She began her career at Fidus SAL in Beirut, Lebanon, as an Execution Officer in the Back Office Department, where she managed accounting, finance, and regulatory reporting to the Central Bank of Lebanon. Prior to joining STP Partners, Elia worked at SHUAA Capital as a Senior Analyst in Operations, gaining extensive experience in operational management.

Elia holds a degree in Banking and Finance, has certifications in Financial Instruments, Combating Financial Crime and Banking Ethics, and is fluent in English, Arabic and French. In her free time, she enjoys music and reading.

Kamila
Rojek

Onboarding Specialist
Kamila Rojek is the Onboarding Specialist at STP Partners, responsible for initial due diligence and onboarding of new client firms. Since joining in January 2024, Kamila has been instrumental in streamlining onboarding processes and enhancing compliance protocols.

She began her financial services career at Lloyds Banking Group (UK) in the Operations function. Kamila holds the Fundamentals of Financial Services credential from the Chartered Institute for Securities & Investment (CISI) and is pursuing the CISI International Operations Certificate. She also holds the ICA Certificate in KYC & CDD.

Kamila is fluent in Polish and English. In her free time, she enjoys fitness, personal development and reading.

Sylvain Lemaire

Senior Portfolio Manager
Sylvain Lemaire is a Senior Portfolio Manager at STP Partners, leveraging over 28 years of experience in capital markets, as a Hedge Fund Portfolio Manager, and as a Senior Proprietary Trader focusing on Arbitrage Strategy.

Sylvain launched the first Long Short Market neutral Equity Fund in France in 2001 and went on to take the responsibility of the Long Short and Event Driven Strategy at Systeia Capital management in 2005. He also ran proprietary trading books at BNP Paribas arbitrage and Credit Agricole Indosuez. Sylvain is proud to have never had a single negative year all along his career. He has managed up to €700 million. Then, Sylvain spent 15 years in the sell-side Industry where he developed a strong and successful franchise at Tradition and market Securities in Dubai as a Head of Statistical and Quantitative Trading Strategy Cross Assets. He worked with the biggest European Hedge Fund.

Sylvain holds a DEA in Finance and a Master's obtained at ESCP in 1998. He is fluent in French and English. Outside of work, he enjoys sport.

Roberto Castiglioni

Director of Research
Roberto is the Director of Research at STP Partners, where he supports the trading team by leveraging his expertise in financial markets, valuation, and research methodology. He contributes to the development of multi-asset class investment strategies and helps identify asymmetric opportunities across global public markets.

He began his career at Degiro B.V. as an analyst. Prior to joining STP Partners, Roberto worked at Negma Group Investment Ltd. as a trader and analyst, where he managed the equity division’s portfolio and conducted research on special situations and underfollowed compounders for opportunistic investments.

Roberto holds a Master’s degree in Financial Risk and Data Analysis and is fluent in Italian, English, and Spanish. Outside of work, he enjoys traveling, reading, and personal development.
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