TWSE · 6691 · stock

Yankey Engineering Co., Ltd. (6691) stock price history

Every TWSE trading session of Yankey Engineering Co., Ltd. from Aug 8, 2018 to Sep 24, 2026: 1,977 daily bars, adjusted for splits and dividends, with minute bars from Sep 15, 2026 forward. The full series is served by the API: a free key covers the last year, paid plans the whole history and minute bars.

Get 6691 data, free keyYear by year table

6691 adjusted close, 2018 to 2026

6691Yankey Engineering Co., Ltd.
NT$667.00+68.2% over one year
2020202220242026
NT$700.84
All time high, 2026
NT$733.37
52 week high, NT$375.92 low
1,977
Daily sessions since 2018

Last updated Sep 24, 2026, the last stored session. Refreshes after each trading day. Full 2018 to 2026 series and minute bars.

6691 key facts

  • Yankey Engineering Co., Ltd. (6691) closed at NT$667.00 on Sep 24, 2026 on TWSE.
  • 6691's all time high close is NT$700.84, set on Jun 25, 2026; its all time low close is NT$21.75 on Aug 21, 2018.
  • 6691's 52 week range is NT$375.92 to NT$733.37.
  • 6691 returned +68.2% over the year to Sep 24, 2026 and +620.5% over five years.
  • Since Aug 8, 2018 6691 returned +2,283%, +47.7% a year compounded.
  • 6691's deepest drawdown was -41.5% from Aug 2, 2021 to Jul 6, 2022.
  • DataCedar holds 1,977 daily sessions of 6691 history from Aug 8, 2018 and minute bars from Sep 15, 2026, adjusted for splits and dividends, served by the API under a key.

6691 price chart, 2018 to 2026

6691 adjusted close, Aug 8, 2018 to Sep 24, 2026NT$22.23NT$69.08NT$214.66NT$667.00201820192020202120222023202420252026
Adjusted daily close, log scale. 260 sampled points across the full history; the API serves every session.

6691 returns

Price return from the last close on or before the window start to Sep 24, 2026, on adjusted closes.

PeriodReturn
1 month+9.2%
3 months+0.1%
6 months+25.4%
Year to date+37.7%
1 year+68.2%
3 years+347.1%
5 years+620.5%
10 yearsn/a
Since Aug 8, 2018+2,283%
Compound annual growth, 8.1 years+47.7%

6691 records

Measured on the stored closes; every figure is reproducible from the API series.

All time high close
NT$700.84 on Jun 25, 2026
All time low close
NT$21.75 on Aug 21, 2018
52 week high
NT$733.37 on Jun 29, 2026
52 week low
NT$375.92 on Nov 12, 2025
Deepest drawdown
-41.5% from Aug 2, 2021 to Jul 6, 2022, recovered Feb 20, 2023
Best single session
+15.5% on Jul 15, 2021
Worst single session
-9.9% on Apr 7, 2025
Volatility, 1 year annualised
42.9%
Sessions closing higher, 1 year
51%
Growth of 1 since 2018
23.8×
Best calendar year
2023, +121%
Worst calendar year
2022, -15%

6691 price history by year

Open is the first session's open, high and low span the year, close is the last session's close, and the return is close over the previous year's close. 2018 starts on Aug 8, 2018; 2026 runs to Sep 24, 2026.

YearOpenHighLowCloseReturnVolumeSessions
2026NT$496.83NT$733.37NT$487.16NT$667.00+35.9%151.6M178
2025NT$315.18NT$564.54NT$241.34NT$490.67+55.7%261.1M242
2024NT$184.21NT$326.20NT$181.29NT$315.18+70.8%158.7M242
2023NT$83.51NT$206.98NT$83.09NT$184.50+120.9%244.1M239
2022NT$89.30NT$94.69NT$61.58NT$83.51-14.7%49.5M246
2021NT$43.33NT$107.00NT$43.33NT$97.96+120.9%30.7M243
2020NT$36.18NT$46.01NT$26.31NT$44.35+22.6%26.9M245
2019NT$22.71NT$39.55NT$22.64NT$36.18+59.6%41.4M241
2018NT$27.99NT$28.31NT$21.59NT$22.66n/a2.6M101

6691 monthly closes, last 12 months

MonthMonth end closeChange
September 2026NT$667.00+8.5%
August 2026NT$615.00+7.6%
July 2026NT$571.57-14.6%
June 2026NT$669.18+17.1%
May 2026NT$571.57+3.0%
April 2026NT$554.87+13.7%
March 2026NT$488.04-18.7%
February 2026NT$600.59+15.2%
January 2026NT$521.45+6.3%
December 2025NT$490.67+10.9%
November 2025NT$442.31+9.3%
October 2025NT$404.50+4.0%

About the 6691 data

Daily bars. 1,977 sessions from Aug 8, 2018 to Sep 24, 2026, one row per TWSE trading day with open, high, low, close and volume. Prices are adjusted for splits and cash dividends so the series is comparable across its whole length; the API also serves the raw, split only and dividend only views.

Minute bars. Stored from Sep 15, 2026 forward, most recent session Sep 24, 2026. Minute history is captured from the day collection began and is never backfilled, so this start date is exact. Five minute, fifteen minute and hourly bars are derived from these minutes.

Time and currency. Session dates are TWSE trading days; minute timestamps are UTC. Prices are in TWD. Volume is shares traded on the session.

Get the data. The REST endpoint returns the daily series as JSON with pagination; a free key serves the last year, Quant and above the full history back to Aug 8, 2018, and minute bars come with the paid windows. It takes timeframe (1Min, 5Min, 15Min, 1Hour, 1Day), adjustment, start and end. See the bars endpoint and authentication, and pricing for the plan windows.

curl "https://api.datacedar.com/v3/stocks/6691/bars?timeframe=1Day&adjustment=all&limit=50000" \
  -H "X-API-Key: YOUR_KEY"

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