Fifteen years ago, William Tewiah was focused on building a fuel distribution company that mainly served mining companies in Ghana’s Western Region. Today, he has emerged as the holder of the largest individual equity stake ever seen on the Ghana Stock Exchange.
The founder of ZEN Petroleum Holdings PLC became the wealthiest individual investor in Ghana’s stock market following the company’s successful listing on the Ghana Stock Exchange in April, which sparked a sharp rise in its share value.
Based on the company’s current market worth, Tewiah’s 80% ownership in ZEN Petroleum is estimated at about GHS 3.87 billion, or roughly $338 million at current exchange rates.
The valuation places him ahead of some of Ghana’s most established market investors and represents a significant milestone for the country’s capital market, where large founder-driven public listings remain uncommon.
ZEN Petroleum debuted on the Ghana Stock Exchange in April 2026 at GHS 5 per share after offering 128 million shares to investors in a transaction that attracted strong institutional interest.
Since the listing, the stock price has climbed to GHS 7.55, lifting the company’s market capitalization to nearly $422 million, equivalent to GHS 4.83 billion.
Within only a few weeks of trading, ZEN quickly became one of the most valuable companies on the exchange.
The listing also rapidly altered the hierarchy of Ghana’s top investors.
For many years, veteran businessman Daniel Ofori had been regarded as one of the most influential individual shareholders on the Ghana Stock Exchange due to his major holdings in firms such as GCB Bank, SIC Insurance, CalBank, and Societe Generale Ghana.
Unlike Ofori, whose wealth was built through investments spread across several listed businesses over decades, Tewiah’s fortune is largely tied to the stock market valuation of a single company he founded privately before taking it public.
Market observers say the size of the valuation highlights increasing investor confidence in locally owned energy infrastructure businesses at a time when African institutional investors are paying greater attention to domestic long-term investment opportunities.
Interest in ZEN Petroleum was strong even before trading officially began.
The public share offer, which aimed to raise about $56 million or GHS 640 million, was heavily oversubscribed after attracting significant interest from pension funds and investment firms. By the close of the offer period, bids reportedly surpassed $84 million, or GHS 970 million, signalling unusually high demand for a Ghanaian initial public offering.
The successful listing was also seen as a major achievement for the Ghana Stock Exchange, which has in recent years worked to attract more large domestic listings following economic challenges, currency depreciation, and debt restructuring pressures in Ghana.
Beyond its market valuation, ZEN Petroleum’s growth carries broader significance for Ghana’s business environment.
The company became the first indigenous private downstream petroleum company to list on the exchange, in an industry traditionally dominated by multinational and foreign-supported operators.
Executives at the company have consistently stated their commitment to preserving Ghanaian ownership. Board chairman Frank Adu Jr. recently indicated that arrangements had been made with regulators to ensure the company remains fully Ghanaian-owned despite being publicly traded.
Tewiah has also revealed plans to gradually reduce his ownership stake in the future by broadening shareholder participation and introducing employee ownership programmes.
Even so, his current standing already marks a historic moment for Ghana’s stock market.
For many investors, the development is not only about the creation of a paper fortune valued at hundreds of millions of dollars. It also reflects the rise of a new generation of African entrepreneurs building strong indigenous companies capable of achieving substantial value on public markets.