TWSE · 6505 · stock

Formosa Petrochemical Corporation (6505) stock price history

Every TWSE trading session of Formosa Petrochemical Corporation from Dec 26, 2003 to Nov 12, 2026: 5,572 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 6505 data, free keyYear by year table

6505 adjusted close, 2003 to 2026

6505Formosa Petrochemical Corporation
NT$90.20+66.8% over one year
20052010201520202025
NT$122.50
All time high, 2026
NT$129.00
52 week high, NT$44.73 low
5,572
Daily sessions since 2003

Last updated Nov 12, 2026, the last stored session. Refreshes after each trading day. Full 2003 to 2026 series and minute bars.

6505 key facts

  • Formosa Petrochemical Corporation (6505) closed at NT$90.20 on Nov 12, 2026 on TWSE.
  • 6505's all time high close is NT$122.50, set on Oct 16, 2026; its all time low close is NT$15.42 on Dec 26, 2003.
  • 6505's 52 week range is NT$44.73 to NT$129.00.
  • 6505 returned +66.8% over the year to Nov 12, 2026 and +0.1% over five years.
  • Over ten years 6505 returned +22%, +2.0% a year compounded.
  • 6505's deepest drawdown was -75.4% from Oct 1, 2018 to Apr 9, 2025.
  • DataCedar holds 5,572 daily sessions of 6505 history from Dec 26, 2003 and minute bars from Sep 15, 2026, adjusted for splits and dividends, served by the API under a key.

6505 price chart, 2003 to 2026

6505 adjusted close, Dec 26, 2003 to Nov 12, 2026NT$15.42NT$44.78NT$74.13NT$103.4920052010201520202025
Adjusted daily close. 260 sampled points across the full history; the API serves every session.

6505 returns

Price return from the last close on or before the window start to Nov 12, 2026, on adjusted closes.

PeriodReturn
1 month-16.9%
3 months+28.5%
6 months+73.7%
Year to date+88.3%
1 year+66.8%
3 years+21.1%
5 years+0.1%
10 years+21.6%
Since Dec 26, 2003+484.9%
Compound annual growth, 22.9 years+8.0%

6505 records

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

All time high close
NT$122.50 on Oct 16, 2026
All time low close
NT$15.42 on Dec 26, 2003
52 week high
NT$129.00 on Oct 14, 2026
52 week low
NT$44.73 on Jan 21, 2026
Deepest drawdown
-75.4% from Oct 1, 2018 to Apr 9, 2025, recovered Oct 16, 2026
Best single session
+12.5% on Sep 22, 2008
Worst single session
-10.0% on Aug 4, 2025
Volatility, 1 year annualised
58.8%
Sessions closing higher, 1 year
50%
Growth of 1 since 2003
5.8×
Best calendar year
2016, +49%
Worst calendar year
2024, -56%

6505 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. 2003 starts on Dec 26, 2003; 2026 runs to Nov 12, 2026.

YearOpenHighLowCloseReturnVolumeSessions
2026NT$47.03NT$129.00NT$44.73NT$90.20+93.0%5.1B206
2025NT$32.86NT$55.93NT$29.27NT$46.74+41.4%1.9B242
2024NT$74.56NT$75.21NT$32.62NT$33.05-55.8%1.4B242
2023NT$73.26NT$82.42NT$72.34NT$74.84+1.8%425.3M239
2022NT$84.29NT$90.97NT$68.87NT$73.54-12.8%666.6M246
2021NT$86.86NT$102.67NT$77.25NT$84.29-3.3%1B243
2020NT$82.90NT$88.40NT$55.91NT$87.21+5.7%1B245
2019NT$87.25NT$96.59NT$79.52NT$82.48-6.8%638.1M241
2018NT$89.71NT$122.56NT$81.57NT$88.47-0.5%738.2M245
2017NT$81.84NT$90.48NT$73.81NT$88.94+8.7%711.2M243
2016NT$55.23NT$84.04NT$51.88NT$81.84+48.7%919.9M241
2015NT$47.46NT$58.93NT$44.56NT$55.02+15.9%810.3M242
2014NT$54.49NT$56.17NT$43.59NT$47.46-13.2%510.5M240
2013NT$57.30NT$58.97NT$45.98NT$54.69-4.6%410.6M233
2012NT$60.65NT$63.05NT$50.38NT$57.30-6.0%509.5M245
2011NT$61.62NT$72.80NT$49.79NT$60.97-1.4%797.3M241
2010NT$49.11NT$61.99NT$44.10NT$61.87+26.0%651.2M241
2009NT$38.62NT$51.97NT$29.96NT$49.11+27.2%3B243
2008NT$51.37NT$55.61NT$35.20NT$38.62-23.5%83.4B246
2007NT$36.12NT$57.20NT$32.96NT$50.47+40.5%1.4B243
2006NT$26.25NT$36.12NT$25.39NT$35.92+36.9%10.9B239
2005NT$21.29NT$28.87NT$21.11NT$26.25+24.4%9.2B260
2004NT$16.93NT$22.02NT$16.69NT$21.11+24.7%2.4B262
2003NT$15.42NT$17.26NT$15.42NT$16.93n/a177.3M4

6505 monthly closes, last 12 months

MonthMonth end closeChange
November 2026NT$90.20-8.2%
October 2026NT$98.30+1.0%
September 2026NT$97.30+32.4%
August 2026NT$73.50+3.8%
July 2026NT$70.80+28.5%
June 2026NT$55.10+9.6%
May 2026NT$50.26-8.9%
April 2026NT$55.15+2.4%
March 2026NT$53.88+1.1%
February 2026NT$53.29+2.1%
January 2026NT$52.21+11.7%
December 2025NT$46.74-8.6%

About the 6505 data

Daily bars. 5,572 sessions from Dec 26, 2003 to Nov 12, 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 Nov 9, 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 Dec 26, 2003, 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/twse%3A6505/bars?timeframe=1Day&adjustment=all&limit=50000" \
  -H "X-API-Key: YOUR_KEY"

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