Turning sustainability
into business value.

I build companies, advise boards and help organizations turn ESG and sustainability into measurable financial value, from cost of capital to long-term resilience.

Monaem Ben Lellahom

Turning sustainability into value

ESG, sustainability and climate change operator, boardroom strategist and legacy builder.

I'm the founding partner and Group CEO of Sustainable Square, alongside Squarely and Sustainable Capital Advisory, built from the ground up with no debt and no external capital.

Over 22 years, I've delivered 650+ projects for 250+ clients across the Middle East and beyond, advising governments on ESG strategy and policy and structuring financial transactions around non-financial risk. That work has taken me into 2,000+ board and executive trainings and 250+ conferences and summits across 15 markets.

My mornings start at the gym. My days revolve around strategy, clients and product building. My evenings belong to my wife and children. And somewhere in between, I grind my own coffee beans, because even legacy builders appreciate the value of starting the day right.

Investment and ventures

Investment

Sustainable Funds Investment

100% of my personal fund portfolio is allocated to climate and sustainability strategies. Weights as of September 2026.
Schroder ISF Global Climate Change Equity: 27.97%UBS Swiss Sustainable Equity: 21.03%Invesco Environmental Climate Opportunities Bond (USD): 17.63%Invesco Environmental Climate Opportunities Bond (EUR): 17.2%Morgan Stanley Sustainable Emerging Markets Equity: 16.17%5funds

The Hidden Balance Sheet

Blending Financials and Non-Financials

An Amazon #1 bestseller exploring how ESG, sustainability and climate considerations increasingly shape valuation, capital allocation and business resilience. Written for the boardroom, the investment committee and everyone in between who has been told sustainability is a compliance exercise and suspects otherwise.

The thesis: non-financial factors inevitably become financial. ESG is a question of cost of capital, valuation and access to liquidity, not compliance.
ThemesSustainability, Valuation, capital allocation, resilience
RecognitionAmazon #1 bestseller

Governance positions

Jury and judging

I sit on the judging panels of the region's leading ESG and capital markets awards, assessing how listed companies disclose, govern and finance their transition.

Academia engagement

I am regularly invited by leading universities and business schools as a guest lecturer to deliver lectures, executive sessions and masterclasses on ESG, sustainable finance and climate strategy. Each session pairs the theory with what boards, regulators and investors actually ask for: how ESG moves the cost of capital, where the risks sit on the balance sheet, and what a credible transition plan looks like when the numbers have to hold.