Iljin Diamond (081000) 🔎 In-depth
KOSPI · Price as of 2026-08-06 · Updated 2026-08-09
Iljin Diamond makes industrial synthetic diamond (an industrial material for cutting, grinding, and drilling tools) as its core business and, on top of that, holds a holding-company-like structure with several subsidiaries; Iljin Hysolus, which makes hydrogen fuel tanks, is regarded as its prized subsidiary, and it also holds Magma Tool and overseas sales and production entities, so the value and results of its subsidiaries drive the company's overall value. In April 2026 it voluntarily disclosed a corporate value-up plan; in February, full-year revenue of ₩162.4 billion, an operating loss of -₩6.8 billion, and net profit of ₩6.9 billion (an operating loss but net profit) were confirmed; and in March it decided on a cash and in-kind dividend (payout ratio 74%). What stands out recently is that the deep asset undervaluation of a P/B of 0.30x, a 3.4% dividend yield, and the recovery signals of Q1 revenue up 59% and an operating profit swing to positive are strengths; but because the core business's operating profit is still a loss on an annual basis and net profit leans on the subsidiaries' share, whether core operating profit takes hold and the Q1 swing to profit continues is the fork in the road.
This page organises public market and filing data for information purposes. It is not a recommendation to buy or sell, nor investment advice. Metrics labelled “forward” are our own unverified estimates. Please verify with the original DART filings and decide at your own responsibility.
30-second brief
Pulled directly from the computed values below — not a separately written opinion.
What do the SourceComputedEstimateReading tags mean?
Source filings and exchange data · Computed calculated from public data · Estimate our own unverified projection · Reading drafted automatically, then rule-checked. See AI & Automation.
Core valuation metric
This stock's effective sub-sector is “Chemicals” (Chemicals, Refining, Steel & Materials), a type typically read first through P/B.
Chemicals is a cyclical business where profits swing with feedstock prices and product spreads, ballooning in upturns and often slipping into losses in downturns. That makes earnings-based multiples unreliable, so price-to-book (P/B) — the share price against the value of the company's heavy asset base — is the first lens.
Price against assets alone says little about where the cycle stands. Reading it together with price against this year's expected earnings shows how far profits have recovered.
That said, earnings are swinging with the industry cycle right now, so this metric is best viewed alongside asset value and the demand backdrop.
This note explains how each sector is typically valued and is educational context only, not investment advice.
At-a-glance assessment financial health · growth · profitability · valuation
- Debt ratio, current ratio and interest burden all look healthy.
- Revenue rose 3.4% year over year, and the pace is quickening (3-year trend: rising).
- Most recent quarter (Q1 2026) revenue was 58.9% higher than a year earlier.
- ROE is 2.4% (controlling-interest basis). It is below the sector average.
- Operating margin is -4.2%.
- P/B is low versus peers too, so it looks cheap on an asset basis as well.
Ownership & governance As of 2025-12-31
Largest shareholder Iljin Holdings 50.07% (corporate)
Controlling bloc incl. related parties 51.59%
With the controlling bloc holding 52%, control is very secure but the free float is thin.
🔎 In-depth analysis Reading
Iljin Diamond makes industrial synthetic diamond (man-made industrial diamond used for cutting, grinding, and drilling tools) while at the same time holding a holding-company-like structure with several subsidiaries. Its most prized subsidiary is Iljin Hysolus, which makes hydrogen fuel tanks, and it also holds Magma Tool and overseas sales and production entities in the U.S., Japan, Europe, Vietnam, China, and elsewhere. In other words, on top of the core diamond-tool revenue, the value and results of the subsidiaries it holds drive the company's overall value. With a market capitalization of ₩123.7 billion it is not on the large side, so not only the core-business trend but each disclosure related to subsidiary results, dividends, and capital has a large effect on the share price.
The latest close is ₩8,770 and the market capitalization is ₩124.6 billion. The price sits above its 20-day moving average (₩8,590) and below its 60-day moving average (₩10,000). Short-term and medium-term trends are diverging, so the direction is best read separately. The RSI (a supplementary indicator that gauges the strength of gains versus losses over the past 14 days on a 0-100 scale) is 48.3, a neutral level. The one-month change is -4.6%, the three-month change is -38.7%, and the position relative to the 52-week high is -47.1%. Relative strength versus the KOSPI is 6 (on a 1-99 scale, converted from returns against the index over the past year with more weight on recent performance; higher means stronger than the market). It is stronger than roughly 6% of all stocks. Over the past three months it lagged the index by 25.9%. Chart interpretation is best done alongside trading volume and the dates on which disclosures occur.
For the most recent full year, revenue was ₩162.4 billion, operating profit -₩6.8 billion (a loss), and net profit ₩6.9 billion. At the core operating line it is a loss, but thanks to the shares flowing in from the subsidiaries it holds, net profit stays positive. The P/B (how many times book value the share price represents) is 0.30x, trading at one-third of the company's net assets. Factoring in the value of the subsidiaries it holds as well, this signals a share price that is quite cheap against assets. The trailing P/E (on last year's confirmed earnings) is 18.15x, which looks high at first glance, but this is largely because last year's net profit was temporarily reduced. The forward P/E reflecting this year's earnings recovery falls to 9.64x, below the peer Daehan Synthetic Fiber (14.82x). In other words, rather than judging the stock expensive from last year's number alone, viewing it on this year's basis as earnings normalize is closer to the company's real picture. The current ratio is 893%, giving very ample short-term payment ability, and the debt ratio (debt against equity) is 148.6%.
Revenue in 2025 was ₩162.4 billion, up 3.4% year on year with growth gradually quickening. The more striking change is in this year's first quarter. Q1 2026 revenue of ₩47.8 billion jumped 58.9% year on year, operating profit swung from a loss to a positive ₩0.4 billion, and net profit rose 2.4-fold year on year to ₩4.0 billion. This flow, in which demand and revenue revive and earnings power passes the bottom, is the basis for this year's outlook. This year's revenue is seen at around ₩223.3 billion and net profit at around ₩13.0 billion, and the forward P/E reflecting this is 9.64x. It means that once the core business and subsidiary results, which carried losses and weakness last year, return to a normal track, this level of profit is fully achievable, and the Q1 swing to profit shows the starting point.
April 22, 2026 corporate value-up plan (voluntary disclosure): material in which the company directly presented its own plan to raise shareholder value, serving as a primary basis for gauging its direction on dividends and capital use. February 4, 2026 disclosure of change in revenue or profit/loss structure: reflected confirmed results of full-year revenue ₩162.4 billion, operating profit -₩6.8 billion, and net profit ₩6.9 billion. Since an operating-line loss and net profit came together, it is worth checking how the subsidiaries' share flowed in. March 4, 2026 cash and in-kind dividend decision: a disclosure of returning profit to shareholders via dividends; as a company with a high payout ratio of 74%, whether profit and cash flow support this is the point to watch.
The strengths are clear. Trading at one-third of the net assets it holds (P/B 0.30x) and holding prized subsidiaries such as the hydrogen-fuel-tank company, the share price is in a deeply depressed, undervalued state against asset value. The dividend yield is also high at 3.4%, providing a reward while waiting. On top of that, Q1 revenue this year rose 59% and operating profit swung to positive, a signal that last year's weak earnings have entered a recovery phase. The forward P/E of 9.59x on this year's profit is below the peer set, supporting the undervaluation case. On the other side, the point to watch is the structure in which the core business's operating profit is still a loss on an annual basis, so net profit leans on the subsidiaries' share. This stock therefore gains stronger momentum to close the undervaluation gap "when core operating profit takes hold and subsidiary results support it," while "if core losses drag on or subsidiary value wavers," asset value alone may unwind the price only slowly. Whether the Q1 swing to profit continues is that fork in the road.
🔎 Valuation vs peers Undervalued
A peer set of chemical companies close in market capitalization.
| Peer | P/E | P/B | ROE |
|---|---|---|---|
| Daehan Synthetic Fiber | 15.64x | 0.21x | 1.79% |
| Chemtros | — | 1.15x | -3.94% |
| iFamily SC | 6.59x | 1.31x | 17.69% |
Within chemicals, publicly available peers close in market capitalization were the primary reference. The current P/E (how many times one year's profit the share price represents) is 18.15x and the P/B (how many times book value) is 0.30x. That said, because smaller-cap names are heavily affected by earnings swings and financing disclosures, we did not draw firm conclusions from last year's confirmed-results metrics alone. The basis for the outlook box is a DART seasonality approximation.
Earnings outlook Estimate company-stated · verified
| Type | Period | Revenue | Operating profit | Net profit |
|---|---|---|---|---|
| This year | 2026 | ₩223.3 billion | — | ₩13.0 billion |
| Next quarter | Q2 2026 | ₩54.2 billion | — | ₩4.0 billion |
Price history Close · MA20 · MA60
The latest close is ₩8,770 and the market capitalization is ₩124.6 billion. The price sits above its 20-day moving average (₩8,590) and below its 60-day moving average (₩10,000). Short-term and medium-term trends are diverging, so the direction is best read separately. The RSI (a supplementary indicator that gauges the strength of gains versus losses over the past 14 days on a 0-100 scale) is 48.3, a neutral level. The one-month change is -4.6%, the three-month change is -38.7%, and the position relative to the 52-week high is -47.1%. Relative strength versus the KOSPI is 6 (on a 1-99 scale, converted from returns against the index over the past year with more weight on recent performance; higher means stronger than the market). It is stronger than roughly 6% of all stocks. Over the past three months it lagged the index by 25.9%. Chart interpretation is best done alongside trading volume and the dates on which disclosures occur.
Relative performance stock vs index · start = 100
Excess return vs index · 3M -25.85% / 6M -46.18% / 12M -65.16%
Key metrics Computed vs sector median
Valuation
The P/E of 18.15x is above the sector median (14.15x). The P/B of 0.30x is below the sector median (0.90x). That said, this P/E is based on last year's (trailing) results. With recent quarterly earnings up sharply, the trailing P/E can look higher than it really is, so a precise read is best done on this year's expected (forward) earnings.
Enterprise value (EV)
EV = market cap + net debt. It reflects cash and debt, so it captures the real cost of the whole business that market cap alone misses; lower multiples are cheaper relative to earnings or sales.
Intrinsic value (DCF estimate) Estimate
Model output — not a price target. This is what the formula returns under the assumptions below, not a view on where the share price should go.
DCF (discounted cash flow) estimate — discount rate 9.8%, initial growth 10.0%→terminal 2.0%, 10-yr forecast, earnings-based. A reference range that shifts materially with assumptions.
Profitability & financials
Return on equity (ROE) is 2.4%, below the sector average (4.0%). The operating margin is -4.2%. The debt ratio is 16.7%, so the financial structure is stable.
Growth FY2025 · annual report (consolidated)
| Item | 2023 | 2024 | 2025 | YoY |
|---|---|---|---|---|
| Revenue | $108.5M | $110.3M | $114.1M | +3.41% ↑ faster |
| Operating profit | -$3.1M | -$3.3M | -$4.8M | — |
| Net profit | $7.0M | $9.1M | $4.8M | -46.80% ↓ slower |
| 5-year | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Revenue | $131.8M | $131.3M | $108.5M | $110.3M | $114.1M |
| Operating profit | $6.4M | $2.3M | -$3.1M | -$3.3M | -$4.8M |
| Net profit | $6.0M | -$4.7M | $7.0M | $9.1M | $4.8M |
| Revenue CAGR | 4-yr avg -3.55% | ||||
Revenue rose 3.4% year over year (2023 ₩154.5 billion → 2024 ₩157.1 billion → 2025 ₩162.4 billion), and the three-year trend is 'rising'. The pace of growth also quickened from the prior year. Operating results are in the red, so a swing back to profit matters more than the growth rate here. Over the 5 years on record, revenue compound annual growth (CAGR) is -3.5%. The two-year revenue CAGR is 2.5%. In the most recent quarter (Q1 2026), revenue was 58.9% higher than the same period a year earlier.
Latest quarterly results Source Q1 2026 · vs year-ago
Technical indicators Computed
What stands out
- P/E and P/B are both low versus peers, so the price looks inexpensive relative to earnings and assets.
- The dividend yield, at 3.4%, is on the high side.
- The balance sheet is stable in terms of debt and liquidity.
Points to watch
- The figures shown are based on the last annual report as of the writing date, so it is best to review the latest quarterly results and filings alongside them.
Recent news & events searched · sourced
- 2026-04-22UpdateCorporate value-up plan (voluntary disclosure): confirm the company's plan source textThis is planning material presented directly by the company. If it contains figures, treat it as a primary basis for the outlook box; if not, treat it only as directional material. Source
- 2026-02-04EarningsChange in revenue or profit/loss structure of 30% or more (15% for large corporations): full-year revenue ₩162.4 billion, operating profit -₩6.8 billion, net profit ₩6.9 billionThis is recently confirmed or preliminary earnings data. Check whether it points in the same direction as the annual trend and whether any one-off factors are present. Source
- 2026-03-04UpdateCash and in-kind dividend decision: confirm the return termsThis is a disclosure related to cash returns or a change in share count. Confirm whether earnings power and cash flow support it. Source
Figure cross-check computed ↔ external
| Metric | Computed | External | Status | Source |
|---|---|---|---|---|
| Closing price | ₩8,770 | ₩8,770 | Confirmed | link |
| Latest quarterly results | revenue ₩47.8 billion, operating profit ₩0.4 billion | revenue ₩47.8 billion, operating profit ₩0.4 billion | Confirmed | link |
| Annual results | revenue ₩162.4 billion, operating profit -₩6.8 billion | revenue ₩162.4 billion, operating profit -₩6.8 billion | Confirmed | link |
| Outlook/plan disclosure source text | — | — | Confirmed | link |
| Earnings disclosure source text | revenue or profit structure changed by 30% or more (15% for large companies): revenue ₩162.4 billion · operating profit -₩6.8 billion · net profit ₩6.9 billion | revenue or profit structure changed by 30% or more (15% for large companies): revenue ₩162.4 billion · operating profit -₩6.8 billion · net profit ₩6.9 billion | Confirmed | link |
| Shareholder-return disclosure source text | cash/stock dividend declared: check the payout terms | cash/stock dividend declared: check the payout terms | Confirmed | link |
| Outlook box basis | DART | DART | Confirmed | link |
Recent filings Source
- 2026-05-29Corporate governance report
- 2026-05-15PeriodicQuarterly report
- 2026-04-22Disclosure
- 2026-03-19Disclosure
- 2026-03-19Disclosure
- 2026-03-19Shareholders' meeting notice
- 2026-03-11PeriodicAnnual business report
- 2026-03-11Audit report
- 2026-03-04Amended filing
- 2026-03-04Disclosure
- 2026-03-04Shareholders' meeting notice
- 2026-03-04Shareholders' meeting notice
📖 Plain-language glossary — expand if you are new to this
- P/E
- How many times a year's net profit the price is worth (lower is cheaper relative to earnings). The P/E here is on trailing (last full-year) results; for companies whose earnings swing fast (memory chips and other cyclicals/high-growth), a forward P/E on this year's expected earnings is more accurate.
- P/B
- Price relative to net assets (equity). Around 1x means it trades near book value; below 1x means below book.
- P/S
- Price relative to a year's revenue — useful for growth companies with thin earnings.
- Net debt / EV
- Net debt = interest-bearing debt − cash. Negative means more cash than debt (net cash). EV (enterprise value) = market cap + net debt, closer to what it would cost to buy the whole business.
- EV/EBIT · EV/EBITDA · EV/Sales
- Enterprise value against operating profit (EBIT), EBITDA, or revenue. Unlike P/E these reflect debt and cash; lower is cheaper relative to earnings power or sales.
- FCF / FCF yield
- Free cash flow = operating cash − capex, the cash actually left over. FCF yield = FCF ÷ market cap; higher means more cash generated per unit of market value.
- Intrinsic value (DCF)
- Future free cash flow (or, for some capex-heavy but profitable names, forecast earnings) discounted to today to estimate per-share value. Because it shifts a lot with the discount-rate and growth assumptions, it is shown as a bear/base/bull range, and the basis and assumptions are disclosed in one line beneath it.
- ROE
- How much profit the company earns in a year on its equity (%). Higher means better returns on capital.
- EPS / BPS
- Earnings per share / net assets (book value) per share.
- Operating / net margin
- Profit left from the core business / final profit after tax and interest, per unit of revenue.
- Debt ratio
- Debt relative to equity (%). Higher means more reliance on borrowing (norms vary by sector).
- Current ratio
- Assets convertible to cash within a year against debt due within a year. Above 100% leaves some short-term headroom.
- Interest coverage
- How many times operating profit covers the interest owed. Below 1x means operating profit alone struggles to cover interest.
- Dividend yield / payout ratio
- The year's dividend as a % of today's price / the share of earnings paid out as dividends.
- Revenue CAGR
- Multi-year growth expressed as a single yearly average (compound annual growth rate).
- RSI (short-term signal)
- Whether recent price action is overheated or beaten down. Above 70 is overbought, below 30 oversold.
- MA20 / MA60 (moving averages)
- The 20- and 60-day average price. Price above them signals a firmer short-term trend.
- vs 52-week high
- How far below the past year's peak the price sits now (%).
All figures are for reference only; how they read varies by sector and over time.
Sources: Korea FSC market-price API (data.go.kr), OpenDART, KRX/KIND — public data only.
Bong Stocks presents public-data-based information for reference only. It is not investment advice and contains no target prices, ratings, or buy/sell recommendations. Verify independently before making any decision.