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 3490 單井. Please read: https://finlab.finance/en/setup?stock=3490

3490

單井 Optoelectronics As of 2026-06-17 Updated daily after market close

quality needs a look, discounted valuation, no active signal today.

This page refreshes daily after the close. Add 單井 to your watchlist to track signal changes on your next visit.
Valuation 66Quality 53Growth 30Momentum 79Chips 27

Is 單井 a buy? Fundamentals and valuation first

  • Weak profitability.Operating margin is in the 11th market percentile. Latest quarterly ROE ≈ 8.7%.

  • Valuation is low.PE is in the 15th market percentile; within its own history, PE is around the 38th percentile.

  • Foreign investors are net selling.Foreign 20-day net flow ≈ -1.4% of volume (net sell).

Chip flow

Bullish +0.18
BearishNeutralBullish

Institutional rotation, concentration steady — bullish

  • Institutional rotation, concentration steady — bullish
  • 台新證券 holds 1,204 lots
  • sellers have 711 lots left, ~207 sessions to clear

Window from 2026-01-17 · Price +28% · branches to 2026-06-17· TDCC to 2026-06-12

  • Largest holder 台新證券 has accumulated 1,204 lots since the start (sold 0%), holding.
  • Main distributor 凱基-台北 peaked at 1,151 lots, has sold 75%, 287 left, paused recently.
  • TDCC big holders (absolute) >1000-lot holders -0.04pp, mid holders +1, retail -0.19pp — little change.
  • Foreign hedge-desk net short Net short -634 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
台新證券台新-林園富邦-公益華南永昌-高雄永豐金-內湖陽信-石牌
Distributing
凱基-台北摩根大通中國信託-三重富邦-仁愛華南永昌-敦南國泰-敦南
Desks
own scale
台新美林國票-博愛永豐金-板盛
Price Accumulating & Distributing share one scale (comparable); Desks is independent. Zero is the baseline
Branch details Unit: lots

Accumulating

  • 台新證券 +1,204
    sold 0%
  • 台新-林園 +650
    sold 3%· still adding
  • 富邦-公益 +408
    sold 16%· still adding
  • 華南永昌-高雄 +231
    sold 3%
  • 永豐金-內湖 +214
    sold 0%
  • 陽信-石牌 +191
    sold 0%· still adding

Distributing

  • 凱基-台北 287 left
    sold 75%· paused recently
  • 摩根大通 199 left
    sold 69%· ~105 sessions to clear
  • 中國信託-三重 156 left
    sold 45%· paused recently
  • 富邦-仁愛 49 left
    sold 78%· ~5 sessions to clear
  • 華南永昌-敦南 66 left
    sold 69%· ~19 sessions to clear
  • 國泰-敦南 55 left
    sold 73%· ~5 sessions to clear

Desks

  • 台新 -1,875
    unclassified
  • 美林 -714
    hedge desk · will cover
  • 國票-博愛 -551
    unclassified
  • 永豐金-板盛 -526
    unclassified
Still selling 711 lots ~207 sessions to bottom at most
Recent buy/sell force +1,127 absorbed / -471 sold buyers slightly ahead
Hedge-desk net short -581 lots potential cover-buying, not selling pressure
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)
0-20 181-29% -35.5% 21% -48.2%
20-40 You are here429-15.4% -4.3% 31.7% -44.8%
40-60 505-5.6% -11.7% 41.2% -16.9%
60-80 432+24.1% +1.6% 50.5% +5.4%
80-100 412+115.9% +13.3% 76% +78.3%

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 ≈ 12.43, at the 37.5th percentile of its own history (20-40 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
-8.8%
Win rate 43.5% Excess -17.5%
85d
Now
-12.4%
Win rate 24.9% Excess -14%
386d
+54.6%
Win rate 66.4% Excess +42.3%
420d
60-day momentum down
-13.6%
Win rate 30% Excess -23.7%
377d
0%
Win rate 52.8% Excess -8.8%
500d
+40%
Win rate 68.8% Excess +8.9%
311d

Currently in “Mid × 60-day momentum up”: across 386 historical days, 120-day forward avg declined 12.4%, win rate 24.9%, lagged the market by 14%.

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.

15 times historically; 60-day forward avg +32.67%, win rate 64.3%, beating the market by +25.77 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).

77 times historically; 60-day forward avg +9.64%, win rate 53.5%, beating the market by +8.08 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.

46 times historically; 60-day forward avg +1.66%, win rate 40%, beating the market by -2.48 pts on average.

What does 單井 do? Company profile

光電業 上櫃(證券櫃檯買賣中心)

Overview

單井工業股份有限公司為台灣上櫃普通股,股票代號 3490,產業別為光電業。公司設立於 1989/07/20,公開發行日期 2005/08/10,興櫃日期 2006/05/10,上櫃掛牌日期 2007/10/15。總部位於新北市土城區中山路77號,統一編號 23393652;董事長王祥亨,總經理游孟哲,發言人亦為游孟哲。實收資本額新台幣 550,064,350 元,流通在外普通股 55,006,435 股,無特別股、公司債及海外存託憑證。員工規模依 114 年報:2025 年底 96 人,2026/03/31 為 93 人;2025 年底員工組成為行政 22 人、研發 11 人、製造 63 人。主要股東依 2026/03/29 年報資料:王祥亨 4.01%、玉山銀行受託單井工業員工持股會信託財產專戶 3.25%、葉龍雄 2.75%、邱振德 2.57%、鄒麗芬 2.40%、花旗託管柏克萊資本證券有限公司投資專戶 1.45%、平果投資有限公司 1.21%、林國棟 1.10%、彭春翊 0.67%、陳嘉臨 0.67%。2025 年擬配現金股利每股 0.5 元;股利政策原則上優先配發現金,剩餘可分配盈餘原則上優先分派 50% 以上為股東股利,但仍視資本支出、投資環境及營運資金需求決定。

Business

單井主要從事 LED 光電與 IC/半導體封裝模具、自動化後段製程設備、光電太陽能電站維運與售電。2025 年營收新台幣 255,765 仟元,年減 8.56%;營收結構為光電/半導體封裝模具 69,540 仟元、占 27%,光電/半導體自動化設備 20,462 仟元、占 8%,光電太陽能 82,295 仟元、占 32%,其他零組件、修繕等 83,468 仟元、占 33%。產品包括半導體 P-DIP、SOIC、TSOP、TQFP、BGA、MMC 等封裝模具,光電 SMD、IRM、IRDA、LED、EMC/SMC 等封裝模具,Leadframe 自動排片機、自動切彎腳成型機、LED 自動測試分類機、SMD 自動包裝機、自動點膠機、自動雷射印碼機、自動料片分裝機、P/H 雷射/測試一貫機、LED 自動下料機等。商業模式以客製化接單設計、製造、加工、銷售為主,模具與設備通常依客戶規格開發;太陽能業務則為持有及維運分布式/屋頂型太陽能光伏發電系統並售電予供電單位。2025 年銷售地區為內銷 137,697 仟元、占 54%,亞洲外銷 118,068 仟元、占 46%。年報揭露主要銷貨客戶以代碼表示,2025 年 FL013 占銷貨淨額 11%,其餘客戶合計 89%;2024 年 FL013 占 18%、FR001 占 14%、其他占 68%。公司未揭露 FL013/FR001 真實公司名稱。

Outlook 2025–2028

2025 年本業仍承壓:全年營收 255,765 仟元、營業損失 35,196 仟元,稅後淨利僅 3,022 仟元,主要因去年度處分投資性不動產的業外收益基期較高,2025 年營業外收入大幅下降;本業營收則受市場需求下滑影響。公司在 2025 年度營業計畫強調深化研發、提升品質與技術、拓展國內外市場、投入再生能源、數位轉型與智慧管理。2026 年官方展望指出,AI 商機、低碳發展、自動化需求強勁,可能推升 LED 與 IC 封裝廠資本支出;公司將強化 LED/IC 封裝技術服務,並持續增加太陽能發電系統設備以擴大再生能源收入。2026 年研發計畫包括全自動收捲帶機、電子凸輪 D/T 沖壓系統、IC/PHOTO COUPLER 自動取放至壓模機系統、PCB 自動取放至壓模機系統、自動智慧顆粒選取機,預計投入合計約 13,383 仟元,多數預計於 2026 年第 2 至第 3 季完成。2026 年太陽能投資計畫為由公司或太陽能子公司共同投資太陽能發電案場,預計投入新台幣 3 億元以內,資金規劃為自有資金 20%、銀行融資 80%。2027-2028 年未見公司公開財測;依年報揭露的產業趨勢推估,中長期動能來自 Mini/Micro LED、車用照明、IR/UV LED、AI/HPC、5G/6G、車用電子、SiC/GaN 功率半導體、Fan-out、2.5D/3D、Chiplet 等封裝技術需求提升,對高精密封裝模具、自動化設備與檢測需求有利;太陽能電站可提供較穩定售電收入。主要風險包括中國中低階競爭者價格壓力、日本與德國高階精密模具技術競爭、人工成本高、高技術人才招募困難、全球景氣與封裝廠資本支出循環、客製化訂單波動、匯率與利率、太陽能案場投資帶來借款及利率風險。

Supply Chain

Upstream
  • 五金零件業者 年報揭露為模具與自動化設備上游;提供五金零件,未揭露具體供應商名稱。
  • 一般鋼材與工具鋼供應商 年報揭露為模具上游主要原料來源;2025 年供應充足,未揭露具體供應商名稱。
  • 電機控制器材供應商 年報揭露為模具與設備上游;用於電控與自動化設備,未揭露具體供應商名稱。
  • 金屬加工業者 年報揭露為模具與設備上游;協助精密加工與零組件供應,未揭露具體公司。
  • 電腦設備與空油壓零組件供應商 年報揭露為光電、半導體後段製程設備上游;未揭露具體公司。
  • 太陽能設備與工程協力廠商 支援公司持有、維運太陽能電站與新增太陽能設備;年報僅揭露持續投資案場,未揭露供應商名稱。
Downstream
  • FL013 2025 年主要銷貨客戶代碼,占銷貨淨額 11%;公司年報未揭露真實名稱與是否掛牌。
  • FR001 2024 年主要銷貨客戶代碼,占銷貨淨額 14%;2025 年未列入前二大,年報未揭露真實名稱與是否掛牌。
  • 半導體封裝業者 模具與後段自動化設備下游;用於 IC/半導體封測製程,年報未揭露具體客戶。
  • 光電產品封裝業者 LED、SMD、IRM、IRDA、EMC/SMC 等封裝模具與設備下游,年報未揭露具體客戶。
  • 被動元件業者 年報列為模具與後段製程設備下游之一,未揭露具體客戶。
  • 台灣電力公司 太陽能發電系統售電下游;台電為國營事業,非台股上市櫃公司。

Competitors

  • 萬潤 6187 台股上櫃公司,自動化設備與半導體/LED/被動元件設備供應商;在封測自動化設備與 LED 設備部分與單井有競爭或替代關係。
  • 均豪 5443 台股上櫃公司,半導體製程暨檢測設備、顯示器製程設備與自動化整合系統供應商;屬廣義半導體設備與自動化設備同業。
  • 志聖 2467 台股上市公司,電子與半導體相關製程設備供應商;屬廣義設備同業,與單井在封裝/電子製程設備資本支出循環上受相似產業需求影響。
  • 公準 3178 台股上櫃公司,精密機械加工與半導體設備零組件相關業務;屬廣義半導體設備供應鏈競爭者。
  • 均華 6640 台股上櫃公司,半導體封裝設備相關供應商;在先進封裝與封測設備領域屬可比同業。
  • 弘塑 3131 台股上櫃公司,半導體濕製程設備供應商;產品線不完全相同,但同屬半導體設備供應鏈競爭者。
  • 中國、日本、德國、美國、韓國精密模具與封裝設備廠商 年報指出全球半導體與精密模具競爭激烈,中國在中低端具價格優勢,日本與德國在高端精密模具較強;未列具體公司名稱。
Sources(17)

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.