Skip to main content
Free trial

Ask AI to review this stock

Copy the prompt to get recent events, historical reactions, and a short research brief.

Tell your AI:

Help me set up FinLab and analyze 8931 大汽電. Please read: https://finlab.finance/en/setup?stock=8931

8931

大汽電 Oil, Gas & Electricity As of 2026-06-17 Updated daily after market close

steady quality, fair valuation, no active signal today.

This page refreshes daily after the close. Add 大汽電 to your watchlist to track signal changes on your next visit.
Valuation 50Quality 60Growth 62Momentum 17Chips 31

Is 大汽電 a buy? Fundamentals and valuation first

  • Above-average profitability.Operating margin is in the 64th market percentile. Latest quarterly ROE ≈ 2.3%.

  • Valuation is neutral.PE is in the 58th market percentile; within its own history, PE is around the 92th percentile.

  • Foreign investors are net selling.Foreign 20-day net flow ≈ -1.1% of volume (net sell).

Chip flow

Bullish +0.23
BearishNeutralBullish

Single-sided accumulation, concentration rising — bullish

  • Single-sided accumulation, concentration rising — bullish
  • 凱基-大里 holds 63 lots
  • sellers have 110 lots left, ~310 sessions to clear

Window from 2026-01-17 · Price -8% · branches to 2026-06-17· TDCC to 2026-06-12

  • Largest holder 凱基-大里 has accumulated 63 lots since the start (sold 0%), still adding.
  • Main distributor 臺銀-民權 peaked at 48 lots, has sold 35%, 31 left, ~310 sessions to clear at the recent pace.
  • TDCC big holders (absolute) >1000-lot holders +0.17pp, mid holders -2, retail +0.70pp — concentration shifting upward.
  • Foreign hedge-desk net short Net short -55 lots (inferred from branch profile, mostly hedging — not necessarily bearish, not case-confirmed).
Branch inventory reconstruction
Accumulating holders Branches that accumulated shares during the window and still hold positive inventory; they are the absorbing side.
Distributing sellers Branches that built inventory earlier and have been selling it down; the remaining number estimates what has not cleared.
Net-short desks Trading-desk branches with negative inventory or net selling, often hedge, offsetting, or short-term flow. It is not automatically a bearish view.
Accumulating
凱基-大里高橋國票-安和富邦-永和兆豐-中壢元大-府城
Distributing
臺銀-民權元大-新莊新光永豐金-新竹凱基-岡山富邦證券
Desks
own scale
華南永昌-敦南富邦-台北台新-嘉義第一金-忠孝
Price Accumulating & Distributing share one scale (comparable); Desks is independent. Zero is the baseline
Branch details Unit: lots

Accumulating

  • 凱基-大里 +63
    sold 0%· still adding
  • 高橋 +62
    sold 0%· still adding
  • 國票-安和 +48
    sold 0%
  • 富邦-永和 +47
    sold 8%· still adding
  • 兆豐-中壢 +31
    sold 16%
  • 元大-府城 +26
    sold 0%

Distributing

  • 臺銀-民權 31 left
    sold 35%· ~310 sessions to clear
  • 元大-新莊 3 left
    sold 90%· ~2 sessions to clear
  • 新光 16 left
    sold 38%· ~16 sessions to clear
  • 永豐金-新竹 15 left
    sold 38%· ~17 sessions to clear
  • 凱基-岡山 8 left
    sold 62%· paused recently
  • 富邦證券 6 left
    sold 70%· ~12 sessions to clear

Desks

  • 華南永昌-敦南 -171
    unclassified
  • 富邦-台北 -162
    unclassified
  • 台新-嘉義 -150
    unclassified
  • 第一金-忠孝 -110
    unclassified
Still selling 110 lots ~310 sessions to bottom at most
Recent buy/sell force +445 absorbed / -77 sold buyers slightly ahead
TDCC big holders · absolute-holding cross-check
>1000-lot holder share Retail (<400 lots) share Price (right axis)

Mixed direction: big-holder and retail changes are not aligned.

Describes chip flow, not investment advice. Branch data discloses only high-volume branches with ~1-day lag; TDCC is weekly. Inventory is a relative reconstruction from the window start, not absolute holdings.

Historical evidence

Valuation regime and subsequent returns

Each day's PE is converted to its own-history percentile (as of that day), then we look at adjusted-close returns over the next 240 trading days by valuation regime.

PE percentile bandSample days240-day avg returnMedianWin rateAvg excess (vs index)
0-20 188+5.7% +5.5% 80.3% -26%
20-40 417+18.7% +18.8% 80.1% +5.8%
40-60 848+11.7% +12% 86.8% -8.2%
60-80 785+17.1% +12.2% 76.8% +2.9%
80-100 You are here805+18.6% +7.7% 76.8% +5.2%

Percentiles use an expanding own-history window (no look-ahead); forward return is 240 trading days on adjusted close. Sample days overlap; distribution is indicative only.

Current PE ≈ 27.5, at the 92.3th percentile of its own history (80-100 band).

Valuation × momentum historical grid

Every day in its own history is bucketed by valuation tercile (own-history PE) and 60-day momentum sign into six cells; we show adjusted-close returns over the next 120 trading days per cell.

Valuation
Momentum
Cheap (own-history bottom 1/3)
Mid
Expensive (own-history top 1/3)
60-day momentum up
+4.8%
Win rate 65.1% Excess -6.4%
324d
+7.7%
Win rate 77.5% Excess -4.9%
825d
+6.1%
Win rate 49.9% Excess 0%
874d
60-day momentum down
+5.2%
Win rate 48.2% Excess -10.5%
193d
+13.3%
Win rate 85.2% Excess +6.7%
540d
Now
+11.8%
Win rate 78.8% Excess +10.4%
382d

Currently in “Expensive (own-history top 1/3) × 60-day momentum down”: across 382 historical days, 120-day forward avg gained 11.8%, win rate 78.8%, beat the market by 10.4%.

Days = trading days in this bucket; returns use adjusted prices, ex-costs. 60-day momentum: direction of this stock's price over the past 60 trading days.

Signals not active (historical stats for reference)

These are not occurring now; historical samples shown for comparison.

252-day price high (breakout)

Pending

Adjusted close makes a new 252-day high; repeats within 20 days counted once.

33 times historically; 60-day forward avg +2.05%, win rate 57.6%, beating the market by -0.04 pts on average.

Monthly revenue YoY ≥ 20% (from filing deadline)

Pending

Monthly revenue YoY ≥ 20%; event date is the first trading day after the filing deadline (no look-ahead).

40 times historically; 60-day forward avg +9.58%, win rate 62.5%, beating the market by +6.31 pts on average.

Foreign net buying for 5 straight days

Pending

Foreign net flow (ex-dealer) positive for 5 straight days; event on day 5; repeats within 20 days counted once.

9 times historically; 60-day forward avg +4.82%, win rate 22.2%, beating the market by +0.78 pts on average.

What does 大汽電 do? Company profile

油電燃氣業 上櫃(櫃買中心)

Overview

8931 對應證券為大園汽電共生股份有限公司,簡稱大汽電,為櫃買中心上櫃普通股,非 ETF、ETN、權證或特別股。公司成立於 1993/08/14,公開發行日為 1994/06/28,上櫃日為 2001/05/10,總部與汽電廠位於桃園市大園區潮音北路 276 號,再生資源廠位於桃園市觀音區大潭里環科路 286 號。董事長為陳明安,總經理為張世陽。實收資本額約新台幣 12.225 億元,已發行普通股 122,254,862 股。114 年報列示截至 2026/04/15 員工合計 183 人,2025 年底員工 189 人。主要股東截至 2026/04/15 為正隆股份有限公司 41.06%、台灣汽電共生股份有限公司 29.31%、尚益染整加工股份有限公司 1.80%、黃彬 1.94% 等。公司無特別股、無公司債,股利政策為年度盈餘依法提列法定盈餘公積及特別盈餘公積後,視獲利、資本預算與未來成長需求分派。

Business

大汽電核心業務為汽電共生廠之經營、操作運轉管理、設備維修、汽電共生系統設計管理顧問、設備進出口諮詢、廢棄物清除處理及焚化爐管理。汽電廠主要產品為電力與蒸汽,利用煤炭、天然氣、水、廢棄物、SRF 等燃料,經鍋爐與汽輪發電機產生電力並抽取蒸汽供工業用戶,剩餘電力可售予台電;蒸汽用途包括染料加熱、布料烘乾、紙漿烘乾等。公司在大園工業區建置超過 10 公里的蒸汽輸送管線,官網稱服務廠商約 60 家且持續擴增,大園工業區主要產業為造紙、染整、化學、電鍍與食品。再生資源廠於 2014 年投入、2015 年投產、2019 年取得甲級廢棄物處理許可,處理有機廢溶劑、半導體與光電面板業廢液、化工業廢液、紡織污泥、食品加工污泥、廢塑膠混合物、廢布與廢纖維等,透過蒸餾、破碎、磁選、造粒等物理處理,生產輔助燃料與固體再生燃料 SRF,部分供汽電廠自用以降低煤炭依賴。2025 年營收淨額為新台幣 2,474,726 仟元,100% 為內銷;2025 年主要產銷實績為蒸汽 568,345 噸、電力生產 359,042 千度且銷售 334,093 千度、廢溶劑 14,054 噸、SRF 11,010 噸。2025 年獲利受天然氣成本大幅上升影響,營業收入年減 1.74%,營業毛利年減 25.03%,營業淨利年減 28.92%,本期淨利年減 19.42%,EPS 1.87 元。主要銷貨客戶中,正隆 2025 年銷售額 636,928 仟元、占銷貨淨額 25.74%,A 公司 499,385 仟元、占 20.18%,其餘客戶 54.08%;A 公司因年報未揭露名稱,無法確認上市櫃身分。

Outlook 2025–2028

2025 年公司完成燃氣渦輪機組商轉,方向是降低碳排係數、因應燃煤退場、提升機組調度彈性;但天然氣成本上升使毛利與營業淨利下滑。2026 年公司營運計畫包含增設複循環汽電共生機組與 EG 廢熱鍋爐改造、推動溫室氣體自主減量、配合台電燃料別躉售費用與燃料別計價機制彈性調度機組、提高 G2 機組低碳燃料使用比例、開發液態廢棄物處理技術、拓展液態廢棄物處理新品項、增加低碳再生燃料來源、對外增加 SRF 碳含量與生質物含量檢測業務。2026 年計畫產銷量為 G3 電力生產 212,790 千度與蒸汽 377,331 噸、G2 電力 90,045 千度與蒸汽 154,321 噸、EG 電力 242,371 千度與蒸汽 61,202 噸;G2 計畫處理 SRF 30,750 噸、木材 26,375 噸、污泥 7,700 噸、TDF 12,420 噸,目標煤炭用量比低於 20%;再生資源廠預估廢溶劑處理 13,100 噸、SRF 處理 12,500 噸。2027 至 2028 年展望屬推估:若複循環機組與低碳燃料調度穩定,售電量、發電效率與碳成本壓力可望改善;AI、半導體與封裝需求若延續,可能帶動有機廢液與溶劑處理量成長;政府循環經濟、SRF 與減煤政策有利於其能資源循環中心定位。主要風險包括天然氣、煤炭與原物料價格波動、碳費及環保法規加嚴、下游客戶減碳改採其他能源或供汽方案、廢棄物處理市場供過於求與削價競爭、蒸汽與電力銷售集中於大園工業區用戶、主要客戶集中,以及新機組投資、商轉與維修效率不如預期。

Supply Chain

Upstream
  • 中國石油股份有限公司(中油) 天然氣主要供應來源;國營事業,非台股上市櫃公司。
  • 熲原、台美熱能、中印能源 年報列示煤炭供應來源,供應狀況為充足穩定;是否掛牌未能確認,故 stock_id 設為 null。
  • 國內半導體業、光電面板業及化工業 再生資源廠有機廢溶劑與有機廢液來源,年報未逐一揭露供應商名稱。
  • 國內紡織業、纖維業及化工業 紡織污泥與固體再生燃料相關廢棄物來源,年報未逐一揭露供應商名稱。
  • 食品業 食品加工污泥來源,供汽電廠作為替代性原料的一部分,年報未逐一揭露公司名稱。
  • 汽電共生系統設備供應者 汽電廠上游包含國內外系統設備供應商,年報未揭露具名設備商。
Downstream
  • 正隆股份有限公司 1904 主要客戶與關係人,2025 年對大汽電銷貨額 636,928 仟元,占銷貨淨額 25.74%;同時為最大股東,持股 41.06%。
  • A 公司 2025 年第二大銷貨客戶,銷貨額 499,385 仟元,占銷貨淨額 20.18%;年報以代號揭露,無法確認名稱與是否台股掛牌。
  • 台灣電力股份有限公司 大汽電餘電可躉售予台電,且 2026 年對台電銷售採燃料別計價;台電為國營事業,非上市櫃公司。
  • 大園工業區造紙、染整、化學、電鍍、食品等廠商 蒸汽與電力主要下游客戶群,依區域管線供應,年報與官網未逐一揭露名單。
  • 汽電廠自用 再生資源廠生產的輔助燃料與 SRF 可供公司汽電廠自用,形成內部循環。

Competitors

  • 台灣汽電共生股份有限公司 8926 上市汽電共生與電力事業集團,亦為大汽電第二大股東;在汽電共生、電力投資、運維與工程服務領域具可比性。
  • 源大環能股份有限公司 台股掛牌公司,市場資料列為汽電共生同業。
  • 台灣水泥股份有限公司 1101 MoneyDJ 資料列為台汽電汽電共生同業之一;台泥集團具能源、餘熱、循環經濟與水泥窯替代燃料布局,但與大汽電業務重疊度屬部分重疊。
  • 台塑石化股份有限公司 6505 MoneyDJ 資料列為台汽電汽電共生同業之一;大型石化與能源業者,具自用發電與能源相關業務,與大汽電區域供汽供電模式不同。
  • 日友環保科技股份有限公司 8341 廢棄物處理上市櫃同業之一,與大汽電再生資源廠在事業廢棄物、有害廢棄物處理領域部分競爭。
  • 可寧衛股份有限公司 8422 廢棄物處理上市櫃同業之一,主要在事業廢棄物處理、固化、掩埋等領域具競爭性。
  • 崑鼎投資控股股份有限公司 6803 環工與焚化、資源循環相關上市櫃同業,與大汽電再生資源與廢棄物能源化方向部分可比。
Sources(11)

This company profile is compiled from public sources (annual reports, filings, news and analyst reports), not finlab backtest data; the 2025–2028 outlook contains forward-looking estimates and is for reference only.

Method and limitations

  • All returns use adjusted close (etl:adj_close), already adjusted for dividends and splits.
  • Excess return is measured against the TAIEX total-return index (dividends included).
  • Valuation regime and percentile stats use an expanding own-history window (no future data).
  • Revenue-signal event dates align to the first trading day after the filing deadline, avoiding look-ahead.
  • Event samples may overlap in time; stats describe historical distribution only and are less reliable when samples are few.

This page is historical statistics for educational purposes and is not investment advice. Investing involves risk; past performance does not indicate future results. Assess and bear the risk yourself before trading.