PER, EPS, PBR and BPS are calculated in-house from the last 4 quarters (2025Q3–2026Q2) · Dividend yield is based on ₩29 per share · Prices as of the 2026-10-02 close
Tuksu Engineering & Construction, a tunnel and underground power-line specialist, posted a large operating loss in 2025 but returned to two consecutive quarters of operating profit in 2026, standing at a turning point for earnings recovery.
2025 consolidated revenue fell sharply to KRW 149.0bn with an operating loss of KRW 31.6bn, concentrated mostly in the fourth quarter
Revenue recovered to KRW 53.2bn and KRW 55.4bn in Q1 and Q2 2026 respectively, with operating profit turning positive for two straight quarters
The debt ratio rose from 73.2% in 2022 to 121.8% in 2025, increasing financial burden
The company declared a cash dividend for the 2025 fiscal year for the first time in 13 years, signaling a shift in shareholder-return policy
The company secured multi-year backlog including the Singapyeong–Dongseoul underground power-line TBM project and the Okjeong–Pocheon regional railway tunnel project
Founded in 1971, Tuksu Engineering & Construction has specialized for more than five decades in underground rail and road crossing structures and TBM (tunnel boring machine)-based shield tunneling.
As of 2025 the company ranked first in Korea in construction capability evaluation for the civil engineering (earthwork) category, with an assessed value of KRW 184.4bn.
Its business lines include TBM tunneling, general civil works, foundation engineering, overseas construction, and heavy industry (based in Asan, Chungnam), with a particular strength in deep underground works such as urban subways, underground power-line ducts, and regional railways.
Key clients include Korea Electric Power Corporation, the Korea National Railway, and major general contractors such as Taeyoung Construction and HL D&I Halla acting as prime contractors, meaning end demand is heavily tied to public infrastructure orders.
Since 2024 the company has invested in advanced equipment, including large-diameter excavators (BG equipment) and oversized shield machines, which have been deployed at sites including Samsung Electronics' Pyeongtaek campus as well as tunnel and underground power-line projects.
This equipment investment was funded through a KRW 12bn convertible bond issued in 2024, and the company has stated that cumulative investment exceeds KRW 60bn.
In terms of competitive landscape, Donga Geological Engineering holds comparable TBM and shield tunneling capabilities, and industry consolidation moves have appeared recently as private equity firm Crescendo PE selected KB Securities as advisor for a potential sale of that company.
The expansion of underground infrastructure projects, such as Seoul's plan to bury above-ground rail lines and the extension of GTX express rail lines, overlaps with Tuksu's core business areas.
| Quarter | Revenue | Operating profit | Op. margin |
|---|---|---|---|
| 2025Q2 | ₩48.2B | -₩20,445,194 | −0.0% |
| 2025Q3 | ₩40.7B | -₩3.9B | −9.7% |
| 2025Q4 | ₩14.3B | -₩28.3B | −197.9% |
| 2026Q1 | ₩53.2B | ₩2.6B | 4.9% |
| 2026Q2 | ₩55.4B | ₩2B | 3.6% |
| Year | Revenue | Operating profit | Net income (parent) | Op. margin | ROE | Debt-to-equity |
|---|---|---|---|---|---|---|
| 2022 | ₩203B | ₩2.7B | ₩1.7B | 1.3% | 1.6% | 73.2% |
| 2023 | ₩232.9B | ₩2.5B | -₩2.3B | 1.1% | −2.2% | 90.4% |
| 2024 | ₩212.5B | ₩8.8B | ₩4.7B | 4.1% | 4.3% | 100.9% |
| 2025 | ₩149B | -₩31.6B | -₩18.2B | −21.2% | −21.1% | 121.8% |
Consolidated basis (financial statements including subsidiaries) · Final figures from DART filings · Net income attributable to owners of the parent · Data as of 2026-08-21
Tuksu's annual results show marked volatility. In 2022 revenue was KRW 203.0bn with operating profit of KRW 2.7bn (operating margin 1.3%); in 2023 revenue rose to KRW 232.9bn but net profit attributable to owners fell to a loss of KRW 2.3bn.
In 2024 revenue declined to KRW 212.5bn, yet operating profit improved sharply to KRW 8.8bn (margin 4.1%), producing owners' net profit of KRW 4.7bn. In 2025, however, revenue collapsed to KRW 149.0bn, with an operating loss of KRW 31.6bn and an owners' net loss of KRW 18.2bn, marking a swing to a large annual deficit.
On a quarterly basis, losses were concentrated in the third quarter of 2025 (revenue KRW 40.7bn, operating loss KRW 3.9bn) followed by an even sharper fourth quarter (revenue KRW 14.3bn, operating loss KRW 28.3bn, net loss KRW 27.1bn), where a steep revenue decline coincided with heavy cost recognition that dragged down the full-year figures.
Thereafter, revenue recovered to KRW 53.2bn in the first quarter of 2026 with operating profit of KRW 2.6bn and owners' net profit of KRW 1.7bn, and the second quarter continued this trend with revenue of KRW 55.4bn, operating profit of KRW 2.0bn, and owners' net profit of KRW 1.7bn.
On the cash-flow side, 2025 operating cash flow was positive at KRW 19.3bn despite the net loss, while in 2024, conversely, operating cash flow was negative at KRW 5.8bn even though net profit was positive—illustrating a divergence between accounting profit and cash generation in certain years.
The debt ratio rose steadily from 73.2% in 2022 to 90.4% in 2023, 100.9% in 2024, and 121.8% in 2025, reflecting expanding financial leverage.
Korea's construction sector experienced a sharp contraction in construction investment in 2025 and is now positioned for a modest recovery in 2026.
The Korea Institute of Civil Engineering and Building Technology projected construction orders would rise 4.0% year over year in 2026, driven by an expansion in public-sector orders while private-sector growth remains limited.
Increases in SOC budgets and public building expansion are cited as the recovery's main pillars, while the private housing market continues to recover slowly.
Tuksu's TBM and shield tunneling civil engineering niche relies relatively more on public infrastructure orders—underground power-line ducts, regional railways, and rail-undergrounding projects—giving it specialized technical capability even though its order scale is smaller than major general contractors.
Competitors include Donga Geological Engineering, and recent moves by a private equity firm to appoint a sale advisor point to potential industry restructuring.
Continued expansion of GTX express rail lines and Seoul's plan to bury above-ground rail lines are cited as factors that could increase demand for underground structure construction, but because Tuksu typically participates as a subcontractor on projects awarded to larger prime contractors, there is a time lag and uncertainty before final order outcomes translate into the company's results. Heightened safety regulation and serious-accident liability laws also weigh on the industry as a whole.
The company attributed the 2025 earnings deterioration to increased depreciation from construction equipment investment, overseas site final settlements, and a decline in construction volume.
Since the company has indicated that its equipment investment funded through the 2024 convertible bond is largely nearing completion, the pace of related depreciation increases could moderate going forward.
Secured backlog includes the Singapyeong–Dongseoul underground power-line TBM contract signed in April 2025 (running through December 2027) and the Okjeong–Pocheon regional railway tunnel contract signed in June 2025 (running through December 2030), providing a partial revenue base for the coming years.
The return to operating profit in both the first and second quarters of 2026 suggests the company has entered a normalization phase following the heavy cost recognition in the fourth quarter of 2025.
The company declared its first cash dividend in 13 years for fiscal 2025, presented alongside a stated intent to focus on profitability expansion based on secured backlog, with management indicating an expectation of improved cash flow as investment activity winds down.
Continued underground-structure-related orders tied to Seoul's rail-undergrounding initiative and GTX line expansion could translate into subcontracting opportunities for Tuksu, though these remain potential market opportunities rather than confirmed contracts.
With the debt ratio having risen, managing the balance sheet and securing profitable new orders are likely to be the key variables for future results.
During the profitable years of 2023–2024, Tuksu traded on the back of low single-digit profit margins, but following the large 2025 loss, profit-based valuation has become difficult to gauge.
Relative to net asset value, the stock has tended to trade at a discount, which is linked to the reduction in shareholders' equity caused by the large 2025 loss.
On the dividend front, the resumption of cash dividends after 13 years carries symbolic significance, though the payout size itself is understood to be modest.
Looking at the most recent four quarters (Q3 2025 through Q2 2026), the large fourth-quarter loss is embedded in the window, producing very high volatility in the earnings trend, with the subsequent two quarters of profit partially offsetting that volatility.
Given this degree of earnings volatility typical of a small-cap construction name, interpreting valuation calls for examining trends across multiple quarters rather than relying on any single quarter or single metric.
PER, EPS, PBR and BPS are all calculated in-house (the same method as Naver and Toss) · Dividend yield = cash dividend per share from DART filings (supplemented by KRX) ÷ current price · As of 2026-08-21
Both the first and second quarters of 2026 saw revenue recover to around KRW 50bn levels, with both operating profit and owners' net profit turning positive. This can be interpreted as a signal that results are normalizing following the large fourth-quarter 2025 loss.
The fact that two consecutive quarters produced similarly sized profits supports the possibility of structural improvement rather than a one-off rebound.
Multi-year contracts—including the Singapyeong–Dongseoul underground power-line TBM project (through December 2027) and the Okjeong–Pocheon regional railway tunnel project (through December 2030)—provide a partial revenue base for the coming years.
Both contracts were disclosed at sizes representing a significant share of recent revenue. This helps partially mitigate the risk of sharp earnings swings from short-term order gaps.
Tuksu ranked first in Korea in construction capability evaluation for civil engineering in 2025, having built specialized expertise in underground structure construction over more than five decades.
Recently introduced advanced equipment such as large-diameter excavators and oversized shield machines have been deployed at major projects including Samsung Electronics' Pyeongtaek campus.
This niche technical capability could serve as a barrier to entry amid the expansion of underground infrastructure such as GTX lines and underground power ducts.
The debt ratio has risen steadily from 73.2% in 2022 to 121.8% in 2025, increasing financial pressure. The large 2025 loss, which reduced shareholders' equity, also contributed to the higher debt ratio. If balance-sheet improvement is delayed, financing costs and funding flexibility could become constrained.
Quarterly results have swung sharply, from an expanding loss in the third and fourth quarters of 2025 to a return to profit in the first and second quarters of 2026. One-off, non-recurring factors such as overseas site final settlements have significantly swayed results in specific quarters in the past. This volatility makes it difficult to predict future quarterly performance with confidence.
Tuksu's order book relies heavily on public-sector volume from entities such as Korea Electric Power Corporation and the Korea National Railway, as well as subcontracting volume from major prime contractors such as Taeyoung Construction and HL D&I Halla.
This creates a structural constraint whereby revenue recognition timing depends on the budget execution schedule of the ultimate client or the project progress of the prime contractor.
Even where potential demand exists from projects such as GTX or rail undergrounding, there is a time lag and uncertainty before this translates into actual contracts.
With the debt ratio having risen to 121.8%, any additional losses could further reduce shareholders' equity and add to financial strain.
In 2024, operating cash flow was negative even though net profit was positive, illustrating a divergence between accounting profit and cash generation that warrants ongoing monitoring.
There is precedent for non-recurring factors such as overseas site final settlements significantly affecting results in a given quarter, and the possibility of similar risks recurring cannot be ruled out.
As a relatively small contractor, cost-ratio fluctuations on individual projects have a comparatively large impact on overall results.
Safety-related regulation across the construction industry, including serious-accident liability laws, continues to tighten, and administrative penalties such as business suspensions or fines can result from defective construction or safety accidents.
Given the nature of underground and tunnel construction, safety management issues could lead to project delays or additional costs.
The third-quarter 2026 earnings release is expected around this time — worth checking whether the profit trend seen in Q1 and Q2 continues into Q3, and whether progress on the Singapyeong–Dongseoul and Okjeong–Pocheon projects is reflected in revenue.
News on new orders or design progress related to Seoul's rail-undergrounding plan and GTX projects — subsequent disclosures or media reports should be checked to gauge whether and to what extent Tuksu participates as a subcontractor.
When new order disclosures with contract sizes large relative to revenue appear, checking the contract period, client, and prime contractor is necessary to gauge the timing of revenue recognition.
It is worth checking whether the dividend resumed for fiscal 2025 after a 13-year gap continues for fiscal 2026, to assess the consistency of the dividend policy.
The debt ratio, which rose through 2025, and operating cash flow should be tracked quarterly going forward to assess whether balance-sheet conditions are improving.
Tuksu Engineering & Construction went through a year of expanding financial strain in 2025, with a sharp revenue decline, a large operating loss, and a rising debt ratio.
However, most of the loss was concentrated in the fourth quarter, and results have since normalized, with both operating profit and net profit turning positive for two consecutive quarters in the first and second quarters of 2026.
Multi-year contracts such as the Singapyeong–Dongseoul and Okjeong–Pocheon projects provide a partial revenue base going forward, and the resumption of dividends after a 13-year gap can be read as a signal of the company's expectation for improved cash flow.
That said, the rising debt ratio, non-recurring risks such as overseas site final settlements, and uncertainty around order timing tied to the public-order and subcontracting structure remain variables to watch.
This report contains no buy or sell recommendation or target price and is prepared for informational purposes only.
Report written 2026-09-05 · Data as of 2026-09-04
This content is AI analysis of market data and web search results, provided for information only. It is not a solicitation or recommendation to invest. Investment decisions and their consequences are the investor's own responsibility. Data may be delayed or contain errors.