Grand Green Energy Co., LTD. (6639) fair value: what the stock is really worth
As of Oct 1, 2026: fair value of Grand Green Energy Co., LTD. TWD 1.10, price TWD 3.46, upside -68.2%, quality 38 out of 100. Calculated from audited financials with 26 valuation models and 37 quality factors, updated daily.
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Price vs Fair Value
White line = price, green steps = our fair value per fiscal year. As of Sep 27, 2026.
How to read this chart
10‑month range 3.46 TWD – 10.80 TWD · fair‑value band 0.8900 TWD – 1.36 TWD · the 3.46 TWD price screens above the 1.10 TWD fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). As of Sep 27, 2026.
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Grand Green Energy Co., LTD. provides energy supply, energy technology services, wastewater treatment engineering, and related environmental services in Taiwan and Mainland China. The company is involved in the research and development of agricultural waste recycling material and biomass heat generating equipment.
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Grand Green Energy Co., LTD. provides energy supply, energy technology services, wastewater treatment engineering, and related environmental services in Taiwan and Mainland China. The company is involved in the research and development of agricultural waste recycling material and biomass heat generating equipment. The company also manufactures and sells organic fertilizers and microbial fertilizers; and renewable energy self-use power generation equipment. The company was founded in 1997 and is based in Taoyuan City, Taiwan.
Stock analysis
Grand Green Energy Co., LTD. (6639) currently trades at 3.46 TWD, while our model-based Fair Value estimate is 1.10 TWD, 68.2% below the price, so the stock looks overvalued today.
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Valuation
Bull case: the Asset-Based group reads highest at a median of 4.14 TWD per share, and 1 of the 7 models we run sit above the 3.46 TWD price.
Bear case: the Multiples group reads lowest at 0.7000 TWD, and 6 of the 7 models stay below the price. Evidence for this calculation is low.
Scenario range: 0.8900 TWD (bear) to 1.36 TWD (bull), the price of 3.46 TWD sits above it. Bear and bull are the same models on cautious and optimistic assumptions, a range, not a price target.
Quality & growth
The Quality Score stands at 38/100 (below-average quality), in the Industrials sector.
Weak Growth: Revenue is shrinking: the last year, the last three and the last five years are all negative.
Grand Green Energy Co., LTD. reported revenue of 102M TWD in FY2025 versus 340M TWD in FY2021, a compound −26.0%/yr. Reported net income was −47.3M TWD in FY2025.
Key figures
Market cap 301M TWD (≈ $9.4M) · P/S ratio 2.95 · EPS (TTM) −0.8200 TWD · Net margin −46.3% · Return on equity −12.5% · Return on assets (EBIT) −8.0% · Operating margin −64.0% · Revenue (TTM) 102M TWD.
Competitive moat
Our AI-assisted moat analysis scores the competitive advantage at 32 out of 100 (low confidence).
What moves the price
For context, the median of 10 Industrials peers we cover trades at −49% fair-value upside, at −68%, 6639 screens richer than that median.
Fair Value models
Bear 0.8900 TWDFair Value 1.10 TWDBull 1.36 TWD
Model ⓘEach model values the company its own way (discounted cash flow, earnings, assets, dividends). The fair value above is their evidence-weighted blend, not the output of a single model.Bear ⓘBear = the cautious scenario: the same model computed with conservative anchors (lower growth, margins and valuation multiples). Together with Bull it frames a plausible valuation range, not a price target.BaseBull ⓘBull = the optimistic scenario: the same model computed with favourable anchors (higher growth, margins and valuation multiples). Together with Bear it frames a plausible valuation range, not a price target. If a model's bull case is above four times its base value, the table shows that limit with a > sign (like the overall Bull above): beyond it no assumption holds.Evidence ⓘEvidence = how well-backed THIS model's estimate is for this stock (0–100): how complete and reliable its input data are, and how well the model fits the company. The final Fair Value is an evidence-weighted blend, so better-evidenced models count more. Green ≥70, amber 50–69, grey below 50.
Growth Quality ⓘGrowth is valuable only when reinvestment earns attractive returns (Aswath Damodaran): sustainable growth depends on return on capital, reinvestment and efficiency. Basis: total company revenue over the periods shown on the cards (3Y/5Y/all years), not per share, so a merger can show up as a growth jump; per-share earnings growth is in the value-creation card.12/100
Revenue is shrinking: the last year, the last three and the last five years are all negative.
Revenue growth 1 year
−21.8%
Revenue growth 3 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
−34.9%
Revenue growth 5 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
−13.8%
Start year 2020 (pandemic)
Revenue growth 6 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
−11.1%
’19
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Profit margin (trend) ⓘOperating margin then vs now, from reported annual statements. A falling margin after a boom year is the classic peak-earnings signal: the growth rate then leans on an inflated base.
−15.1% (2020) → −46.0% (2025)
What shareholders gained per year ⓘWe only publish this rate when it is defensible. Reason: fiscal 2025 is a loss year, no rate is defined from a loss
not computed
Growth Forecast
A lot of optimism in the price
The price assumes more growth than the company has delivered so far.
What the price assumes ⓘThis turns our valuation around: instead of asking what the share is worth, it asks what growth the current price requires. It uses the cash the company keeps after all spending (free cash flow), the same discount rate as our models, five years of growth, then slowing evenly to 2 % a year by year ten. Compared with the analysts' sales forecasts extended to the same five years (at least three analysts, for context only, it does not enter the Fair Value): within 3 percentage points counts as "in line" (amber), below that little optimism (green), above that a lot of optimism (red).
+33.0%
Yearly growth needed for the next five years to justify today's price.
What forecasts expect
n/a
No analyst forecast available.
After inflation (Taiwan: IMF forecast 1.6% a year to 2030, 1.5% from 2016 to 2025) that is about +31.0% a year for the price.
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Peer GroupⓘHow this stock ranks against its industry: the green marker is this stock, the band is the typical 25–75% peer range, and the tick is the median.Specialty Industrial Machinery · 800 stocks
Beats the industry median on 2/9 measures
Overall it trails its industry peers.
Valuation
Quality Score38 · Bottom 25%
Fair Value upside−68.2% · Bottom 25%
Profitability
Return on assets−5.0% · Bottom 25%
Net margin (TTM)−46.4% · Bottom 25%
Operating margin (TTM)−64.0% · Bottom 25%
Growth and dividend
Revenue growth−19.7% · Bottom 25%
Balance sheet
Debt / equity0.18× · Above median
Valuation Multiplesvs Specialty Industrial Machinery median · lower = cheaper
P/S (TTM)0.09× · Cheapest 25%
P/FCF2.6× · Cheapest 25%
Strength profile in five axes (Snowflake)
This stockSector peers
VALUE (fair-value potential)0· sector 0
FUTURE (revenue growth)0· sector 28
PAST (return on equity)0· sector 28
HEALTH (low debt)91· sector 95
DIVIDEND (yield)0· sector 26
VALUE 0: the price sits above our fair-value range.
For bloggers, editors and developers: paste this into your site or blog (a “Custom HTML” block in WordPress), it shows the current fair value and links back here. Free, plain HTML, and welcome. Full data streams (CSV/JSON) at /developers.
Cite: Fair Value Calculator (2026). "Grand Green Energy Co., LTD. Fair Value". https://www.fairvalue-calculator.com/stock/6639
Frequently asked questions
Is Grand Green Energy Co., LTD. (6639) overvalued or undervalued?
As of Sep 27, 2026, our model estimates a fair value of 1.10 TWD versus a price of 3.46 TWD, about −68% upside (overvalued).
What is the fair value of 6639?
Our model-based fair value for Grand Green Energy Co., LTD. is 1.10 TWD (as of Sep 27, 2026), built from audited fundamentals. The current price: 3.46 TWD.
What is the quality score of 6639?
Grand Green Energy Co., LTD. has a Quality Score of 38/100. It measures business quality (profitability, growth, cash flow, balance-sheet strength, investment discipline, share issuance). Market factors such as price momentum and volatility do not enter the number; they are shown separately in the detail view.
What is the price target for Grand Green Energy Co., LTD. (6639)?
Our model-based price target is the fair value of 1.10 TWD (as of Sep 27, 2026) from 7 valuation models. Cautious scenario 0.8900 TWD, optimistic scenario 1.36 TWD. It is a calculation from audited fundamentals, not an analyst target.
What is the Grand Green Energy Co., LTD. stock forecast for 2026?
Our models put fair value at 1.10 TWD, about −68% upside versus a price of 3.46 TWD (overvalued). Cautious scenario 0.8900 TWD, optimistic scenario 1.36 TWD. The calculation is refreshed regularly with new filings.
What is the revenue of Grand Green Energy Co., LTD. (6639)?
Grand Green Energy Co., LTD. reported trailing-twelve-month revenue of about 102M TWD (latest available figure, as of Sep 27, 2026).
What growth is priced into Grand Green Energy Co., LTD. (6639)?
For today's price to be fair in a discounted-cash-flow model, Grand Green Energy Co., LTD. would have to grow free cash flow by +33.0 % per year for five years (discount rate 10.3 %, then slowing evenly to 2 % perpetual growth by year ten). Over the last 5 years revenue grew -13.8 % per year. As of Sep 27, 2026.
What discount rate (WACC) does the fair value of 6639 use?
Our models discount Grand Green Energy Co., LTD. at 10.3 %: a base by market capitalisation (nano), country premium for Taiwan. The same rate applies in all 26 models.
What is a reverse DCF?
A reverse DCF turns the usual calculation around. Instead of deriving a value from assumptions, it takes today's price as given and asks: what free-cash-flow growth would a company have to deliver for exactly this price to be fair? The result is not a forecast but the expectation already priced in. For Grand Green Energy Co., LTD. that is +33.0 % per year a year over ten years, using the same discount rate (10.3 %) and the same formula as our fair value.
How much growth has Grand Green Energy Co., LTD. (6639) delivered so far?
Over the past 5 years revenue at Grand Green Energy Co., LTD. grew -13.8 % a year. The price currently implies +33.0 % per year free-cash-flow growth a year. Comparing the two shows how much confidence is in the price: if it demands more than has been delivered, the business has to accelerate for the maths to work.
How fast is the sector of Grand Green Energy Co., LTD. (6639) growing?
The median revenue growth in the sector is +5.7 % a year. That is the yardstick for the growth priced into Grand Green Energy Co., LTD. (+33.0 % per year a year): it shows whether the expectation is within the usual range or beyond it.
What is the free cash flow yield of Grand Green Energy Co., LTD. (6639)?
The free-cash-flow yield on the price is 1.84 %: that much free cash flow Grand Green Energy Co., LTD. produces per unit of market value. When it exceeds the discount rate of our models (10.3 %), the business already earns more than its cost of capital demands, and the price needs little additional growth.
What is the intrinsic value of Grand Green Energy Co., LTD. (6639)?
Intrinsic value and fair value mean the same thing: what the business is worth on its numbers, independent of the share price. For Grand Green Energy Co., LTD. it is 1.10 TWD per share (as of Sep 27, 2026), against a price of 3.46 TWD. It is the blended result of 7 valuation models (cash flow, earnings, asset, dividend).
Is Grand Green Energy Co., LTD. stock overvalued or undervalued in 2026?
As of Sep 27, 2026, 6639 trades above its calculated fair value: price 3.46 TWD, fair value 1.10 TWD, a gap of about −68% (overvalued). The calculation is refreshed with each new quarterly report, so the verdict can change during the year.
Is fair value the same as the market price of 6639?
No. The price is what the market pays today (3.46 TWD); the fair value is what the company's own numbers justify (1.10 TWD). For Grand Green Energy Co., LTD. the two are 2.36 TWD per share apart. That gap is exactly why we show both numbers side by side.
How much is Grand Green Energy Co., LTD. worth?
The market values Grand Green Energy Co., LTD. at about 301M TWD (market capitalisation, as of Sep 27, 2026). Per share that is 3.46 TWD; our models calculate a fair value of 1.10 TWD per share.
What do the bullish and bearish scenarios say about 6639?
Our models span a range for Grand Green Energy Co., LTD.: cautious scenario 0.8900 TWD, base 1.10 TWD, optimistic 1.36 TWD per share (as of Sep 27, 2026, price 3.46 TWD). The range comes from different growth and margin assumptions, not from analyst opinions.
How solid is the balance sheet of Grand Green Energy Co., LTD. (6639)?
Balance-sheet figures for Grand Green Energy Co., LTD. (as of Sep 27, 2026): return on equity −12.5%, debt of 0.18 per unit of equity. They feed the Quality Score of 38/100, which measures business quality independently of the share price.
Which stocks are comparable to Grand Green Energy Co., LTD.?
From the same area (Industrials) we also value GE Vernova Inc, SIE, Eaton Corporation, Parker-Hannifin Corporation, among others. Each of them has its own fair-value calculation on this site using the same models, so the comparison is like for like.
Is Grand Green Energy Co., LTD. stock attractive at the current price?
The data as of Sep 27, 2026: price 3.46 TWD, calculated fair value 1.10 TWD (−68%), Quality Score 38/100, from 7 models. Whether that fits your horizon and risk tolerance is your call. We provide the calculation, not investment advice.
How is the fair value of 6639 calculated?
We run Grand Green Energy Co., LTD. through 7 models from four families: discounted cash flow, earnings models, asset and balance-sheet models, and dividend models. Every model gets the same audited fundamentals; the result is the weighted average of 1.10 TWD, with the spread shown as a cautious and an optimistic scenario.
Is it still worth investing in stocks now?
The global stock market currently sits 14.7 % above its aggregate fair value. Grand Green Energy Co., LTD. itself currently trades above fair value. An expensive market is no reason to stay out and no reason to buy everything at once: keep a broad savings plan running, buy single stocks only with money you can do without, and hold part of your money liquid while the market is high. The full picture including sectors is on is it worth investing now.
What is the share price of Grand Green Energy Co., LTD. (6639)?
The closing price on Oct 1, 2026 was 3.46 TWD. Our model-based fair value is 1.10 TWD, about −68% upside (overvalued). We carry closing prices from our data provider, not a live tick.
What should I pay attention to with Grand Green Energy Co., LTD. right now?
The price sits above even our optimistic bull case (1.36 TWD). The favourable scenario is already priced in. Weak quality (38/100) and above fair value at the same time, the margin of safety is missing on both counts. The large gap to fair value rests on thin data (low evidence): fewer applicable models and a shorter history. Read it with extra caution.
Key figures of Grand Green Energy Co., LTD.
How large is the market capitalisation of Grand Green Energy Co., LTD. (6639)?
The market capitalisation of Grand Green Energy Co., LTD. is 301M TWD (≈ $9.4M). The stock-market value of the whole company: share price times number of shares. It is what the market asks for the entire business today.
What is the P/S ratio of Grand Green Energy Co., LTD. (6639)?
The price-to-sales ratio of Grand Green Energy Co., LTD. is 2.95 (last twelve months). Price to sales: market value relative to yearly revenue. Useful when profit is thin or distorted.
What are the earnings per share of Grand Green Energy Co., LTD. (6639)?
Earnings per share at Grand Green Energy Co., LTD. are −0.8200 TWD. Earnings per share over the last twelve months: total profit spread across every single share.
What is the net margin of Grand Green Energy Co., LTD. (6639)?
The net margin of Grand Green Energy Co., LTD. is −46.3% (fiscal year 2025). How much of every unit of revenue ends up as profit. 10% means 10 cents of profit per dollar of sales.
What is the return on equity of Grand Green Energy Co., LTD. (6639)?
The return on equity (ROE) of Grand Green Energy Co., LTD. is −12.5% (last twelve months). Profit relative to shareholders' equity, how efficiently the company works with its owners' money.
What is the EBIT return on assets of Grand Green Energy Co., LTD. (6639)?
On an EBIT basis the return on assets of Grand Green Energy Co., LTD. is −8.0% (avg 5y). Operating profit (EBIT) relative to everything the company owns, as a multi-year average. It describes the business model rather than one good or bad year.
What is the operating margin of Grand Green Energy Co., LTD. (6639)?
The operating margin of Grand Green Energy Co., LTD. is −64.0% (last twelve months). Profit from the core business (before interest and taxes) relative to revenue.
How fast is revenue growing at Grand Green Energy Co., LTD. (6639)?
Revenue at Grand Green Energy Co., LTD. is growing −19.7% versus a year earlier (3y avg −34.9%). How much revenue grew versus a year earlier (YoY). The 3-year average next to it puts the single year in context.
How much net debt does Grand Green Energy Co., LTD. (6639) carry?
The net debt of Grand Green Energy Co., LTD. is 72.1M TWD (fiscal year 2025, ≈ 19.7 yrs of FCF). Debt minus cash on hand. The note shows how many years of free cash flow could in theory pay it off.
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