About Oesa Partners

Our business is tailored to be an integral part of our clients’ legal and risk management processes. We provide dynamic and proactive advice in relation to the negotiation of all the trading and counterparty documentation required to establish prime brokerage, OTC & ETD derivatives, clearing, brokerage and cash book relationships.  We also advise on the associated legal regulatory issues that arise. We are cost-effective and pioneered the use of fixed fees.

Our Expertise

Our Services

Documentation Audits and Assistance with DDQ

We undertake documentation audits for investment managers and fund boards to ensure the agreements are current and compliant with the ever-changing regulatory environment and DDQ disclosures.


We offer time sensitive advice covering general issues that arise, from day to day queries through to assistance with complex trade disputes.

Derivative, Trading, Brokerage and Custody Documentation

The negotiation of all counterparty documentation forms a significant part of Oesa’s offering across all buy side strategies regardless of the size of the fund, platform or managed account.

Fund Platforms

Managed account and umbrella fund platforms can be a cost-effective way to launch new Funds. We provide a vital comprehensive and legally sound document review to assist with the onboarding process. 

Why Choose Oesa

Experts in Our Field

Kate Wormald has been a sales and trading lawyer all of her career. She has contributed, and still does, to many industry initiatives. Her experience is unsurpassed by the competition and she is recognised as a leader in her field, winning many awards yearly.

Efficient & Practical Advice and Negotiations

Time is money and so we conduct ourselves to ensure we get the results the client needs in the most efficient and practical manner, to make the most productive use of our client’s time and resources.

Competitive All-Inclusive Fixed Fees

We were the first firm to introduce fixed fees.  These have proved popular as they enable our clients to budget accurately for their legal costs without worrying about a clock ticking in the background.

Get in Touch

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    Words From Clients

    • We see Oesa as an extension to our team, rather than an external resource, with the knowledge that we can rely on them for fast and accurate legal services.

      Andy Baker, Operations Manager – Tabula Investment Management Limited
    • I have known Kate and Oesa for a number of years and have always found her and her team to be highly efficient, their integrity unquestionable and their rates highly competitive.

      Robert Moore
    • Kate has built a market-leading business and product offering and it’s no surprise that her clients derive a huge amount of value from her work.

      MD, Top 5 Global Prime Broker
    • We love Kate’s straightforward, direct and commercial approach.

      Prime Broker, American Investment Bank