We recognise your individual investment risk requirements

The Nautilus AcuityOne RHF Hedge Fund has specific key features

The Fund aggressively takes advantage of short and medium term opportunities and pricing anomalies

Acumen Fund focuses primarily on South African Government Bonds and interest rate derivatives

About Acumen Capital
Acumen approaches the interest rate markets from a distinct vantage point.
Our capabilities in cash flow analysis combined with our fundamental and technical expertise provide investment insight that few competitors can match. Comprehensive analysis of cash flow valuations enables Acumen to exploit inefficiencies in the markets using diversified investment strategies.

Selected investment strategies are implemented with specific focus on protecting the value of assets in adverse market conditions, whilst maintaining upside potential.
Our Edge
Our Core Focus … The South African interest rate environment.
Over 60 Years Collective Market Experience … both local and international, in a broad range of financial instruments. Proprietary Analytical Tools … specifically designed for the interest rate environment, combined with our global insight, enables us to identify valuation anomalies – the cornerstone of our competitive edge.

Cash flow and yield curve modeling techniques have been applied to managing trading portfolios, whilst structuring innovative interest rate solutions.


The Acumen Philosophy
Our philosophy is to enhance returns by using disciplined investment processes combined with rigorous investment management principles.
Acumen Capital ensures that our clients objectives and risk profiles are clearly understood so that the optimal investment strategy is implemented.
The Fund Management Team
Our Core Focus … The South African interest rate environment.
Acumen Capital was established in 2001 by Stuart Conway and Mark O’Brien.
The initial purpose of the company was to act as a structured intermediary between market participants in South African interest rate products.
Greg Kamstra joined the company in March 2007, to focus on the management of 3rd party capital, resulting in the launching of the AcuityOne hedge fund in September 2009.


Stuart Conway


Stuart Conway (BSc. Actuarial) Director of Acumen Fund Managers. Stuart has 26 yrs experience in the investment industry and was previously Head of Interest Rate Trading at Absa Bank prior to setting up Acumen Capital 15 yrs ago.

1990 - 1993
JA Carson & Partners (Consulting Actuaries).
Investment consultant specializing in Asset/Liability modeling and Attribution analysis.

1993 - 1996
First Derivatives: Derivatives Trader

1996 - 1998
Absa Bank: Derivatives Trader

1998 - 1999
African Merchant Bank: Derivatives Trader

1999 - 2001
Absa Bank: Head of Interest Rate Trading

2001 - Present
Acumen Capital: Director

Mark O’Brien


Mark O’Brien. Director of Acumen Fund Managers. Mark has 28 yrs experience in the investment industry and was previously Chief Dealer at Absa Capital Markets prior to setting up Acumen Capital 15 yrs ago.

1998 - 1999
Societe General: Capital Markets Trader

1992 - 2000
CA Miller & Co: Director – Capital Markets

2000 - 2001
Absa Bank: Head – Bond Trading

2001 - Present
Acumen Capital: Director

Greg Kamstra


Greg Kamstra (BSc. Hons) Director of Acumen Fund Managers. Greg has 26 yrs experience in the investment industry. He previously set up and managed an interest rate hedge fund at Peregrine, was head of fixed income at Citibank NA for 2 yrs and was head of Merrill Lynch Capital Markets SA for 3 yrs.

1990 - 1993
SG Warburg London: European Interest Rate Trader

1993 - 1999
Merrill Lynch Europe: Senior Trader European Interest Rates.
Appointed Director of trade in 1995

1999 - 2001
Merrill Lynch South Africa: Head of Debt Capital Markets

2001 - 2003
Citibank NA South Africa: Head of Fixed Income

2003 - 2007
Peregrine Holdings: Fixed Income hedge fund manager

2007 - Present
Acumen Capital: Director