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  1. Oxx
  2. Team
  3. Mark Lewis

Mark Lewis

London
Operating Partner
Mark brings his extensive CFO experience from companies like IRIS Software Group to help Oxx’s portfolio companies scale their finance functions and expertly navigate capital markets. A strategic thinker with a hands-on approach, Mark leverages his broad expertise across sectors—from software to diamond manufacturing—to support founders in building resilient, high-performing businesses. He’s dedicated to guiding finance teams with clarity and precision, empowering them to drive sustainable growth.

As Operating Partner, Mark is Oxx’s resident problem-solver. With a career spanning electronics engineering, strategy consulting, and financial leadership, one can easily spot where this problem-solving ability comes from. 

I had an early interest in technology and business. That took my career into electronics and software, followed by strategy consulting and then financial leadership roles. Over that period, I was fortunate in having opportunities to work across a very broad range of industries.

Having known Mark since their first jobs after university, Richard asked Mark to come on board to build the firm’s operations function in 2020. Mark was particularly intrigued by the prospect of working with a small, energetic team with clear focus, and who all love what they do and are passionate about it. It’s quite a change from the larger organisations Mark has historically been part of, but there has been plenty to draw on from his earlier career in building the foundation of Oxx. Naturally drawn to build and fix processes, Mark brings a wealth of varied experience in the aspects of business building that, to some, aren’t always seen as the most glamorous – but essential nonetheless. Looking at how Oxx has developed since he joined, it is easy to see where Mark has, forgive the pun, made a mark, as his fingerprint can be found on anything from firm structure and governance, legal setup and compliance across multiple geographies.

Mark also lends his expertise to the companies in our portfolio, particularly enjoying working with teams and together both setting up long-term plans and solving complex situations. His background from larger organisations enable him to quickly bring in new and relevant perspectives. Founders encounter challenges on a daily basis, and one can’t overstate the value of counsel based on lived experience. 

It’s important to have clarity about the facts before making important strategic decisions, but experience and pattern recognition are at least as critical. So it’s normally important to involve people who’ve seen something similar before, and supporting analysis doesn’t need to be detailed as long as it is relevant and addresses the main points. Most leaders I have met regret big decisions that were made a long time later than when the first intuition suggested a change was needed, and this is particularly the case with decisions about critical team roles.

When asked what his hidden trait is, Mark references his ability to stay calm in a crisis. For team members, that resonates very well with who he is, though he admits it’s tricky to judge when “just to listen and when to ask questions or offer suggestions based on experience.” 

Perhaps the calmness both comes from experience and intuition, as much as having a balance between work and personal life. While claiming he only needs a short walk to unwind after a long day, he fills his time with family and other activities which helps keep a clear mind. Mark’s true passion is music, and he is active in the local musical community as chair of a local opera group.

Joined Oxx
2020

Geekiest thing about me
There's a hidden engineer within me, even though I moved out of an engineering career in the 1980s, and this compels me to pull things apart, find out how they work and improve them

Hidden talent
Calmness in a crisis

Favourite mountain or slope
I'm really more of a sea person than a mountain person, and I used to do a lot of offshore sailing. I've particularly enjoyed the Channel Islands and the West Coast of Scotland


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