Where to begin
On August 7, 2026, Zhejiang Zheneng Mailang Green Navigation Technology Co., Ltd. (referred to as Zheneng Mailang) re-submitted its listing application to the Hong Kong Stock Exchange, with CITIC Securities and CMB International acting as joint sponsors. This marks the company's second attempt within six months—its previous filing on January 30 had lapsed. From terminating its A-share listing guidance to twice submitting to Hong Kong, the path to an IPO for Zheneng Mailang has been fraught with twists and turns. Established in 2028 and backed by Zheneng Group, which is controlled by the Zhejiang State-owned Assets Supervision and Administration Commission, the company emerged from ultra-low emission technology for land-based power plants. By pivoting into the marine exhaust gas purification sector, it has captured the top global market share for marine desulfurization systems in just a few years.
On one hand, there is the industry-wide demand driven by the mandatory implementation of emission reduction policies from the International Maritime Organization (IMO). On the other, the company's revenue nearly doubled in the first five months of 2026, showcasing explosive performance. However, beneath the spotlight, weaknesses such as high customer concentration and volatility in overseas operations are equally prominent. As global shipping decarbonization enters a mandatory cycle, when a high-growth niche leader lists in Hong Kong, is its investment value a realization of industry boom dividends, or are operational risks overstretching its valuation?
High growth in revenue and profit, with 68% of revenue dependent on a single major client
According to Zheshang Securities, Zheneng Mailang has built a five-layer business structure to meet the needs of global shipping groups, shipowners, and shipyards: "Exhaust gas purification as the foundation, energy efficiency systems as the growth engine, and support services for stickiness." The marine exhaust gas purification desulfurization system (EGCS) serves as the company's core foundation. The marine energy efficiency gain system is its second growth curve and the primary driver of the revenue surge in 2026. Ancillary businesses include ship retrofitting, intelligent operations and maintenance, and new energy shipping, where retrofitting enhances customer loyalty, smart operations ensure long-term returns, and new energy ventures address future fuel transitions, completing the full industry chain layout.
Further, by 2025 revenue, the company was the world's largest provider of marine exhaust gas emission control and purification systems. Its flagship product, the EGCS, ranked first globally by revenue. The Greenhouse Gas Continuous Emission Monitoring System (GHGCEMS) is the first in the world to obtain a classification society certification. Additionally, in 2025, by revenue, it was the second-largest global provider of marine energy efficiency gain systems.
Leveraging its leading position and diversified business structure, Zheneng Mailang's performance hit a turning point from stability to explosion in 2026. According to the prospectus, revenue was 2.369 billion yuan in 2023 and 2.397 billion yuan in 2024, maintaining stable operations. In 2025, driven by a concentrated release of orders for retrofitting existing vessels, revenue surged to 3.501 billion yuan, a 46% year-on-year increase. In the first five months of 2026, revenue directly reached 2.507 billion yuan, a staggering 89.4% jump year-on-year, fully releasing short-term explosive growth, with the marine energy efficiency business as the core engine.
Meanwhile, Zheneng Mailang's profit trajectory closely mirrored revenue. Net profit for 2023, 2024, and 2025 was 621 million yuan, 626 million yuan, and 773 million yuan, respectively, showing stable core earnings. In the first five months of 2026, net profit was 622 million yuan, nearly matching the full-year profit of 2025. Gross margin stood at 34.2% in 2023, 35.1% in 2024, 30.4% in 2025, and 34.8% in the first five months of 2026. The decline in 2025 may be due to lower initial margins for new businesses, but the recovery to 34.8% in 2026 indicates that economies of scale are emerging. Additionally, with growing revenue and profits, the company's financial position is robust: as of May 31, 2026, it held 1.5 billion yuan in cash and cash equivalents, with a net current asset value of 1.69 billion yuan, indicating ample cash flow overall.
However, high customer concentration may be the biggest "gray rhino" on the path of explosive performance. According to the prospectus, in 2023, 2024, 2025, and the five months ended May 31, 2025 and 2026, the top five customers accounted for 84.7%, 69.5%, 77.0%, 71.6%, and 88.1% of total revenue, respectively. Revenue from the largest customer alone represented 36.9%, 57.3%, 66.0%, 57.6%, and 68.1% of total revenue over these periods. Heavy reliance on a single major client implies limited bargaining power and high revenue volatility risk; a reduction in the large client's retrofitting budget could directly impact revenue stability.
Furthermore, large dividends declared before the IPO may raise questions about capital allocation strategy. According to the prospectus, the company declared dividends of 223.5 million yuan in 2023, 350 million yuan in 2024, and 231.7 million yuan in the first three quarters of 2025, totaling over 800 million yuan. From these observations, it's clear that Zheneng Mailang's biggest advantage is being "global number one," but its biggest risk is also "only having one client"—when 68% of revenue is tied to a single entity, even the most impressive growth story warrants caution.
Positioning in a trillion-yuan race track, with dual risks behind the 'double champion' halo
From an industry perspective, Zheneng Mailang operates in a typical high-growth segment: policy certainty is high, demand is rigid, and it is currently in a boom phase transitioning "from 1 to N." Since the global sulfur cap took effect in 2020, sulfur oxide emissions have been significantly reduced. With the Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII) being continuously tightened, and the European Union's Emissions Trading System (ETS) incorporating shipping, regulations are becoming stricter, not looser, providing the industry's greatest certainty. Meanwhile, supported by resilient shipping trade demand, the global fleet has grown steadily, increasing from 106.2 thousand vessels in 2021 to 115.7 thousand in 2025, a compound annual growth rate (CAGR) of 2.2%. Looking ahead, the global fleet is expected to maintain steady growth, reaching 128.2 thousand vessels by 2030, with a CAGR of 2.1% from 2026 to 2030.
Driven by multiple factors, including policy locking in demand floors and the irreversibility of shipping decarbonization, the global green shipping equipment and systems market is also showing high prosperity. According to data from Frost & Sullivan, the global green shipping equipment and systems market is expected to grow at a CAGR of 31.7% from 2025 to 2030, reaching a market size of 151.6 billion yuan by 2030. The vessel retrofitting market alone reached 7.5 billion yuan in 2025, with a CAGR of 28.2% from 2026 to 2030. In this trillion-yuan arena, Zheneng Mailang is not just a participant but a frontrunner that has already taken the first turn. By 2025 revenue, it was the largest global provider of green shipping equipment and systems, with an 8.9% market share. Specifically, its marine exhaust gas emission control and purification system revenue was 1.57 billion yuan, holding a 13.5% market share, ranking first globally. Its marine energy efficiency gain system revenue was 855 million yuan, with a 7.4% market share, ranking second globally. The company has established service locations in China, Singapore, Turkey, Greece, and other countries. Key competitors like Feen Marine and Panasia Co. are all unlisted companies—if successfully listed, Zheneng Mailang would become the first public company in its peer group.
However, the two major risks faced by Zheneng Mailang are also noteworthy. First, multiple disturbances in overseas operations: a high proportion of overseas revenue makes it susceptible to exchange rate fluctuations and translation losses. Overseas geopolitical conflicts, changes in maritime policies across countries, and rising cross-border compliance costs can disrupt project delivery and profits. Second, the risk of a downturn in the shipping cycle: weak global trade and a sharp drop in shipping freight rates could lead shipowners to cut back on environmental retrofitting spending, delaying equipment procurement orders and causing a decline in industry-wide orders.
Final thoughts
In conclusion, while Zheneng Mailang is a "leading company in a trillion-yuan race track," it still carries significant structural flaws. A trillion-yuan market, global leadership, and state-owned backing—these labels are enough to entice any investor. But true investment wisdom often lies in the calm after the excitement. High customer concentration, doubts about pre-IPO dividends, and the risk of a shipping cycle downturn are among the multiple uncertainties that could constrain its valuation. Therefore, for risk-tolerant investors, this is a noteworthy "green shipping first stock." For those seeking stability, it is wiser to wait for tangible progress in customer diversification and further clarity on operational uncertainties.