who we are

A global energy and commodities firm with an international reputation for integrity

Integrity is the foundation of Hartree’s collaborative culture. Our reach extends across the globe and across asset classes. Hartree, founded in 1997, is privately held by management and Oaktree. Our 12+ global offices and over 100 accomplished traders in more than 20 business lines work collectively to provide deep insight and expertise to enterprise-level, multinational and nation-state customers.

“Our global reach means that we can react quickly to changing geopolitical events and provide a broader, more diverse perspective on markets.”

Guy Merison, Founding Managing Director


The secret to our success is our people and our values

Our people are our greatest asset. We are a global community of over 450 dedicated women and men who are committed to operating inclusively, encouraging diverse perspectives and meaningful relationships with integrity in all we do.

We are
Deeply analytical

data driven and methodical, research and application oriented, we seek to understand before we act

We are

intellectually curious and enterprising, our goal is to develop new methods and find new opportunities

We are

creative and cutting edge, we welcome opportunities to break new ground

We are

collegial and connected, our best work comes through the teams we have built

We are

operating with respect and honoring commitments, we are dedicated to making ethical and sustainable business decisions that reflect our core value of integrity


Working towards a sustainable future

We view leading the way for a sustainable future as both an opportunity and an imperative. Hartree is at the forefront of finding investment solutions, consulting, and generating sustainable and commercially viable strategies for energy renewal and regeneration. Technology is key to facilitating our research and promoting the efficient processing of our businesses. It is powering our ideas for a sustainable future.

A flourishing relationship with over $1 billion invested

Hartree is owned by the company’s founding partners, senior staff, and certain funds managed by Oaktree Capital Management, LP. Since 2015, Oaktree has invested in excess of $1 billion alongside our management team. As a result, Hartree is well-positioned to capitalize on the structural changes confronting the energy and commodities markets.

Our Founders

Guy Merison

Founding Managing Director

Stephen Semlitz

Founding Managing Director

Stephen Hendel

Founding Managing Director

Our history


HETCO (Hess Energy Trading Co)

Joint venture formed in New York between Hess and our Founding Partners



Hetco opens Singapore office, pursuing growth in Asian commodities and trading talent


Renewable Energy

Hetco begins trading renewable fuels and environmental credits.



Oaktree Capital Management purchases Hess’ stake in Hetco and the company is renamed Hartree Partners, LP


Proprietary Investments in Assets

Hartree Bulk Storage formed to explore asset and infrastructure opportunities


Capital Management

Hartree Capital Management formed to provide customers with alternative investment solutions


Environmental Ventures

Vertree and AGP formed to establish renewable power capacity.


Connected global expertise

Our reach extends across the globe and across asset class.

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We are looking for people of integrity, who have an entrepreneurial spirit, a drive for excellence and the ability to be a productive and supportive team member