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 8358 金居. Please read: https://finlab.finance/en/setup?stock=8358

No install, open FinLab Studio

8358

金居 Electronic Components As of 2026-06-17 Updated daily after market close

strong quality, premium valuation.

2 active signals
Revenue ≥20% Foreign buy
This page refreshes daily after the close. Add 金居 to your watchlist to track signal changes on your next visit.
Valuation 12Quality 90Growth 81Momentum 99Chips 75

Is 金居 a buy? Fundamentals and valuation first

  • Top-tier profitability.Operating margin beats ~90% of the market. Latest quarterly ROE ≈ 6.6%.

  • Valuation is high.PE is in the 92th market percentile; within its own history, PE is around the 100th percentile.

  • Foreign investors are net buying.Foreign 20-day net flow ≈ 4.4% of volume (net buy).

  • Strong revenue growth.Latest monthly revenue YoY ≈ 41.4%, above the 20% growth threshold.

  • Signals are active now.On the latest data, signals such as Revenue YoY ≥ 20%, Foreign net buying 5 straight days are active — see the historical forward returns after each occurrence below.

Chip flow

Bullish +0.67
BearishNeutralBullish

Single-sided accumulation, concentration rising — bullish

  • Single-sided accumulation, concentration rising — bullish
  • 法銀巴黎 holds 6,775 lots
  • sellers have 9,223 lots left, ~255 sessions to clear

Window from 2026-01-17 · Price +131% · branches to 2026-06-17· TDCC to 2026-06-12

  • Largest holder 法銀巴黎 has accumulated 6,775 lots since the start (sold 0%), holding.
  • Main distributor 台灣摩根士丹利 peaked at 6,668 lots, has sold 39%, 4,071 left, ~73 sessions to clear at the recent pace.
  • TDCC big holders (absolute) >1000-lot holders +3.56pp, mid holders -17, retail +0.14pp — concentration shifting upward.
  • Foreign hedge-desk net short Net short -2,812 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
法銀巴黎美商高盛摩根大通新加坡商瑞銀美林兆豐證券
Distributing
台灣摩根士丹利元大證券永豐金證券凱基-台北國票-敦北法人華南永昌
Desks
own scale
國泰證券凱基-站前台新證券(牛牛牛)亞證券
Price Accumulating & Distributing share one scale (comparable); Desks is independent. Zero is the baseline
Branch details Unit: lots

Accumulating

  • 法銀巴黎 +6,775
    sold 0%
  • 美商高盛 +6,712
    sold 21%· still adding
  • 摩根大通 +6,428
    sold 0%· still adding
  • 新加坡商瑞銀 +5,577
    sold 25%
  • 美林 +5,422
    sold 10%
  • 兆豐證券 +1,617
    sold 17%

Distributing

  • 台灣摩根士丹利 4,071 left
    sold 39%· ~73 sessions to clear
  • 元大證券 3,899 left
    sold 37%· ~111 sessions to clear
  • 永豐金證券 675 left
    sold 82%· paused recently
  • 凱基-台北 990 left
    sold 66%· paused recently
  • 國票-敦北法人 586 left
    sold 67%· ~255 sessions to clear
  • 華南永昌 1,061 left
    sold 30%· paused recently

Desks

  • 國泰證券 -7,057
    unclassified
  • 凱基-站前 -5,237
    unclassified
  • 台新證券 -3,321
    unclassified
  • (牛牛牛)亞證券 -3,238
    unclassified
Still selling 9,223 lots ~255 sessions to bottom at most
Recent buy/sell force +4,634 absorbed / -1,655 sold buyers slightly ahead
Hedge-desk net short -172 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

Signals active now

These signals are true on the latest data, with this stock's own historical forward-return stats after each occurrence.

Monthly revenue YoY ≥ 20% (from filing deadline)

Active · now 41.37%

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

70 historical occurrences (since 2010-09-27)
Average forward return after Monthly revenue YoY ≥ 20% (from filing deadline)。20-day: Win 48.3%, Sample 58, Median -0.1%, Excess +1.86%, Beat mkt rate 43.1%；60-day: Win 51.8%, Sample 56, Median +1.22%, Excess +8.28%, Beat mkt rate 46.4%；120-day: Win 41.5%, Sample 53, Median -4.2%, Excess +13.4%, Beat mkt rate 32.1%

120 days after: historical avg +21.74%

20-day +3.77%
60-day +13.48%
120-day +21.74%
20-day
60-day
120-day
Win
48.3%
51.8%
41.5%
Sample
58
56
53
Median
-0.1%
+1.22%
-4.2%
Excess
+1.86%
+8.28%
+13.4%
Beat mkt rate
43.1%
46.4%
32.1%

Over 53 occurrences, 120-day forward avg gained 21.74%, beat the market by 13.4 pts; win rate 41.5%.

Foreign net buying for 5 straight days

Active · now 9%

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

45 historical occurrences (since 2016-05-10)
Average forward return after Foreign net buying for 5 straight days。20-day: Win 60.5%, Sample 43, Median +2.47%, Excess +6.04%, Beat mkt rate 48.8%；60-day: Win 57.1%, Sample 42, Median +11.52%, Excess +9.92%, Beat mkt rate 52.4%；120-day: Win 70%, Sample 40, Median +20.48%, Excess +37.4%, Beat mkt rate 62.5%

120 days after: historical avg +47.4%

20-day +8.78%
60-day +15.99%
120-day +47.4%
20-day
60-day
120-day
Win
60.5%
57.1%
70%
Sample
43
42
40
Median
+2.47%
+11.52%
+20.48%
Excess
+6.04%
+9.92%
+37.4%
Beat mkt rate
48.8%
52.4%
62.5%

Over 40 occurrences, 120-day forward avg gained 47.4%, beat the market by 37.4 pts; win rate 70%.

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)
0-20 170+46% +53.3% 89.4% +29.2%
20-40 107+48.8% +33.6% 80.4% +29.8%
40-60 507+166.5% +15.7% 60.9% +144.6%
60-80 555+50.4% +44.3% 78.9% +24.4%
80-100 You are here442-2.7% -4.2% 34.4% -20.3%

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 ≈ 122.84, at the 100.0th 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
-1.6%
Win rate 47.5% Excess -11.7%
40d
+37.6%
Win rate 63.8% Excess +29.8%
235d
Now
+20.4%
Win rate 55.9% Excess +5.2%
655d
60-day momentum down
+24.5%
Win rate 76.3% Excess +20.7%
194d
+55.1%
Win rate 47.7% Excess +49.9%
497d
+17%
Win rate 80.7% Excess -0.2%
280d

Currently in “Expensive (own-history top 1/3) × 60-day momentum up”: across 655 historical days, 120-day forward avg gained 20.4%, win rate 55.9%, beat the market by 5.2%.

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.

Does this signal hold up across the market

Over the past 242 months, on average ~404 stocks per month met “monthly revenue YoY ≥ 20%”; their adjusted-close return over the next 60 trading days averaged 6.94% (equal-weighted), beating the market by 2.37 points on average, and outperformed the TAIEX total-return index in 64.5% of months.

Each month, equal-weighted 60-day forward adjusted return of all signal-matching stocks, then averaged across months; excess vs the TAIEX total-return index.

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.

26 times historically; 60-day forward avg +28.71%, win rate 62.5%, beating the market by +21.58 pts on average.

What does 金居 do? Company profile

電子零組件業；電解銅箔／PCB上游材料 上櫃（櫃買中心 TPEx）

Overview

金居開發股份有限公司成立於1998年5月22日，總部位於台北市內湖區瑞光路392號18樓，工廠位於雲林縣斗六市科工八路56號；股票代號8358，2007年11月7日登錄興櫃，2010年9月27日上櫃，為營運公司普通股。公司英文名稱為Co-Tech Development Corporation。依公開資訊與公司官網，2026年6月17日前後最新揭露的經營團隊為董事長李思賢；第三方股市資料亦列董事長兼總經理為李思賢。公司113年度年報揭露114年2月28日流通在外普通股252,588,000股、核定股本300,000,000股；第三方資料換算實收資本額約新台幣25.26億元。113年度年報列114年2月28日員工307人，113年度員工315人。主要股東依113年7月15日年報資料包括宋恭源13,812,998股、5.47%；大松投資12,497,270股、4.95%；華榮電線電纜7,812,375股、3.09%；滙豐台灣受託保管摩根士丹利國際投資專戶4,836,637股、1.91%；詹其哲3,696,000股、1.46%；光隆實業3,000,000股、1.19%；國泰世華商業銀行2,600,000股、1.03%；大通託管梵加德新興市場基金2,445,000股、0.97%；滙豐台灣受託保管美林國際投資專戶2,138,000股、0.85%；大通託管JP摩根證券投資專戶2,063,373股、0.82%。公司沿革中，2023年取得進階反轉電解銅箔、銅箔基板、微粗糙電解銅箔等日本、美國、大陸發明專利與UL2809再生料含量驗證。

Business

金居主業為電子級電解銅箔，年報明確指出公司產製單一產品「電子級銅箔」，為印刷電路板業主要原料之一，供應銅箔基板（CCL）製造商與多層印刷電路板（PCB）廠。官網說明金居生產電解銅箔，提供銅箔基板、多層印刷電路板與高密度連接板電鍍相關關鍵材料。產品與技術包含Low Profile、反轉銅箔、Advanced RTF（RG系列）、HVLP3/HVLP4/HVLP5（VL/PF系列）、AI Server用HVLP4/HVLP5、5G軟板MPI/LCP用FL系列、一般軟板RV/FL、無線充電RC系列、車載與大電流散熱基板用210um厚銅箔，以及9um、12um、18um、35um、70um等厚度規格。應用端包括銅箔基板、PCB、HDI、軟板、伺服器、資料儲存器、交換器、路由器、5G基地台、微波通訊、衛星傳輸、汽車電子、ADAS、LED車燈模組、3C電子、家電、工業與醫療儀器。商業模式為採購回收銅線及金屬化學品，經銅線溶解、硫酸銅電解、生箔、表面處理、檢查、裁切包裝後銷售給CCL與PCB供應鏈；產品報價受銅價、加工費、規格與認證狀態影響，高階低粗糙度產品有較高附加價值。113年度合併銷貨淨額6,821,558仟元，113年年報揭露銷售區域以外銷為主，內銷約10-15%，外銷至中國、日本、韓國、東南亞、歐美合計約85-90%；公司穩定供應國內前三大銅箔基板廠及多層PCB廠，但依契約以代號揭露主要客戶，113年主要銷貨客戶D0304占16%、D0948占11%，其餘客戶占73%。2025年第三方財務資料顯示全年營收約78.80億元，毛利率約21.8%；公司官網營運資訊與Yahoo股市營收資料顯示2026年1月營收820,421仟元，年增45.92%，2026年2月營收850,914仟元，2026年5月營收941,901仟元，較2025年5月666,236仟元明顯成長。

Outlook 2025–2028

2025展望：公司113年度年報的2025營業計畫明確聚焦5G、AI、IoT、邊緣運算、AR/VR、自駕車、智慧家庭、資料中心與伺服器等高頻高速應用；公司自行開發先進式反轉銅箔，並持續開發低訊號傳輸損失、超低粗糙度與高抗撕裂強度銅箔，以對應高可靠度、低延遲大規模資料傳輸；同時已完成FCCL用銅箔及大功率充放電厚銅箔開發。2026展望：截至2026年6月17日，公開營收資料顯示2026年前段營收年增強勁，官網揭露5月營收941,901仟元，市場新聞並稱HVLP4供不應求、每股配息2元；較可信的成長動能來自AI伺服器、交換器、資料儲存與高階CCL材料升級，尤其224G高速傳輸對HVLP4/HVLP5、Low Dk/Df材料與低粗糙度銅箔需求提高。2027-2028展望屬推估：若AI伺服器平台由800G/1.6T交換器、224G SerDes與更高層數PCB持續升級，金居高階HVLP4/HVLP5及RG系列有機會拉高產品組合與毛利率；雲林科技工業區新廠擴建若按規劃放量，可能提供更多5G、AI相關產品產能。主要風險包括國際銅價波動牽動營收與成本、電價上漲、環保與用工限制、中國大陸銅箔產能擴張造成標準品供需失衡、ECFA早收清單關稅變動、美中科技戰與關稅衝突、通膨與終端需求循環、主要客戶認證導入速度不如預期，以及高階銅箔良率與量產穩定性風險。

Supply Chain

Upstream
  • K1786（年報代號，未揭露供應商名稱） 113年度主要供應商，進貨2,237,434仟元、占進貨淨額52%；公司依契約以代號揭露，無法確認是否台股掛牌。
  • K1822（年報代號，未揭露供應商名稱） 113年度主要供應商，進貨1,527,635仟元、占進貨淨額35%；公司依契約以代號揭露，無法確認是否台股掛牌。
  • 回收銅線供應商 主要原料為回收銅線，來源含國內、東南亞、東北亞、歐洲等地，年報稱供應量充足、生產來源不虞匱乏；未揭露具名供應商。
  • 金屬化學品與添加劑供應商 製程需硫酸銅溶液、硫酸、鍍銅、鍍鋅、鍍鉻及表面處理添加劑；年報未揭露具名供應商。
Downstream
  • 國內前三大銅箔基板廠 年報稱公司穩定供應國內前三大銅箔基板廠；因契約限制未揭露客戶名稱。
  • 多層印刷電路板廠 年報稱供應多層PCB廠，產品用於PCB外層線路、電鍍通孔、盲孔等；具名客戶以D0304、D0948等代號揭露。
  • 台光電子材料 2383 台股上市高階銅箔基板廠，屬金居產品的典型下游產業；未由金居年報直接點名為客戶，列為產業鏈推定關係。
  • 台燿科技 6274 台股上市銅箔基板材料廠，屬高頻高速CCL下游；未由金居年報直接點名為客戶，列為產業鏈推定關係。
  • 聯茂電子 6213 台股上市銅箔基板廠，屬金居電解銅箔的可能下游；未由金居年報直接點名為客戶，列為產業鏈推定關係。
  • AI伺服器、資料儲存器、網路交換器與路由器供應鏈 終端應用端；金居年報稱雲端產品、伺服器、資料儲存器、網路交換器等需求帶動高頻高速材料放量。

Competitors

  • 南亞塑膠 1303 台股上市公司，產品線含電子材料與銅箔/銅箔基板相關材料，為台灣電解銅箔與CCL供應鏈競爭者之一。
  • 榮科材料 4989 台股上櫃公司，從事電解銅箔材料，為國內電解銅箔同業。
  • 長春石化 台灣未上市化工與電子材料集團，市場資料列為銅箔競爭者；非台股上市櫃。
  • 台灣銅箔 台灣電解銅箔同業，未確認為台股上市櫃公司。
  • 台日古河銅箔 台灣/日本技術背景銅箔同業，未確認為台股上市櫃公司。
  • Fukuda Metal Foil & Powder 日本銅箔與金屬粉末廠，非台股掛牌。
  • Furukawa Electric 日本上市公司古河電工，銅箔/電子材料相關競爭者，非台股掛牌。
  • JX Nippon Mining & Metals 日本ENEOS集團旗下材料公司，非台股掛牌。
  • Mitsui Kinzoku 日本上市材料公司三井金屬，銅箔競爭者，非台股掛牌。
  • Lotte Energy Materials（原ILJIN Materials） 韓國上市材料公司，銅箔競爭者，非台股掛牌。
  • 建滔集團 香港上市PCB/CCL與材料集團，銅箔與銅箔基板供應鏈競爭者，非台股掛牌。
Sources（16）

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.