Fractional Finance Director
Lak has spent over 30 years as Finance Director and CFO to growing B2B companies — SaaS, marketing and media agencies, professional services — and has taken several of them through to successful sales. He works hands-on: in your business, with your team, on your numbers.

Core Expertise
Over 30 years of finance leadership experience helping B2B SMEs (tech, SaaS, Marketing & Media agencies, Professional Services) scale and achieve successful exits.
M&A transactions
Our track record of successful M&A transactions.
Client Success Stories
Feedback from founders.
"Lak joined us at Enigma to help strengthen our financial processes, corporate compliance and governance as we prepared the co for sale. On joining the agency Lak enhanced the monthly management reporting, budgeting, forecasting process and introduced best financial practice. Additionally, Lak was instrumental in setting up our new Singapore office, even helping recruit and onboard our MD in region, whilst establishing all processes and managing in-region compliance. As we agreed a sale of the business to Just Media in the US, Lak conducted all the heavy lifting with regards [to] the trade sale, ensuring the disruption to the business was minimised whilst the lengthy contractual negotiations and DD took place. His prior M&A experience acting both for the Buyer and Seller was invaluable to us the founders, ensuring we were guided to achieve the best possible outcome."
"I was first introduced to Lak as part of the team acquiring our business. Over the 3 month period of due diligence he proved to be an incredibly detailed, focussed and knowledgeable individual with an incredible ability to cover every base in the negotiation almost single handedly. In this phase I described him many times as 'a force to be reckoned with'. Once the deal was done, I found a whole new side to Lak - a dedicated custodian of our financial wellbeing. His ability to maintain an air of calm means he has become a source of stability in our organisation where there was previously a certain amount of turbulence. He has brought us round to a new way of financial management that has had a huge impact on the way we do business. I don't think we would be achieving what we are today if it were not for his oversight, management and masterful control of our finances."
"I've had the great pleasure in working alongside Lak twice! Lak was an important partner and advisor to help me set up local entities of both agencies we've worked together on. He's keen eyes for details and his extensive knowledge and versatility on both the financial and legal grounds have been instrumental in helping us set up offices, processes and teams successfully across the APAC region within countries like Singapore and China."
"Since Lak came into the business, I've been extremely fortunate to have worked closely with him on a range of areas relating to the growth of the agency in the region. Lak has been brilliant in supporting us with the right advice by focusing on the strategic changes needed to make a measurable impact - giving the whole agency better focus as a result."
"Lak has been a valued partner supporting the US leadership team as we've built the San Francisco office of April Six. Lak has provided ongoing finance and HR support, enabling our full focus to be concentrated on client relationships and new business development. Lak has been incredibly responsive, a great problem solver and enabler of the business, never letting time zones get in the way of progress."
From seller-side preparation and trade sale execution to buyer-side due diligence and post-acquisition integration, our clients benefit from comprehensive M&A expertise and ongoing financial leadership.
Frequently Asked Questions
Who is behind Oppenheim Advisory?
Oppenheim Advisory is led by Lak Sidhu, a seasoned finance professional with over 30 years of experience. Lak has worked as Finance Director for numerous companies, successfully guiding multiple businesses through exits including trade sales and EOTs.
What industries does Oppenheim Advisory work with?
We work with businesses across various sectors including technology, marketing agencies, professional services, SaaS companies, manufacturing, and more. Our experience spans B2B and B2C companies primarily in the UK market.
Where is Oppenheim Advisory based?
We are based at 7 Kinghorn Park, Maidenhead SL6 7TX, Berkshire, and provide fractional finance director services to businesses across London, the South East, and throughout the UK. We work both on-site and remotely depending on client needs.
