TWSE · 6658 · stock
SynPower Co., Ltd. (6658) stock price history
Every TWSE trading session of SynPower Co., Ltd. from Nov 5, 2021 to Sep 24, 2026: 1,187 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.
6658 adjusted close, 2021 to 2026
- NT$257.00
- All time high, 2026
- NT$260.00
- 52 week high, NT$45.71 low
- 1,187
- Daily sessions since 2021
Last updated Sep 24, 2026, the last stored session. Refreshes after each trading day. Full 2021 to 2026 series and minute bars.
6658 key facts
- SynPower Co., Ltd. (6658) closed at NT$179.00 on Sep 24, 2026 on TWSE.
- 6658's all time high close is NT$257.00, set on Jul 1, 2026; its all time low close is NT$29.80 on Jul 19, 2022.
- 6658's 52 week range is NT$45.71 to NT$260.00.
- 6658 returned +200.2% over the year to Sep 24, 2026.
- Since Nov 5, 2021 6658 returned +411%, +39.6% a year compounded.
- 6658's deepest drawdown was -56.1% from Oct 25, 2024 to Nov 21, 2025.
- DataCedar holds 1,187 daily sessions of 6658 history from Nov 5, 2021 and minute bars from Sep 15, 2026, adjusted for splits and dividends, served by the API under a key.
6658 price chart, 2021 to 2026
6658 returns
Price return from the last close on or before the window start to Sep 24, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | +14.4% |
| 3 months | -4.8% |
| 6 months | +177.2% |
| Year to date | +202.8% |
| 1 year | +200.2% |
| 3 years | +292.8% |
| 5 years | n/a |
| 10 years | n/a |
| Since Nov 5, 2021 | +410.9% |
| Compound annual growth, 4.9 years | +39.6% |
6658 records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- NT$257.00 on Jul 1, 2026
- All time low close
- NT$29.80 on Jul 19, 2022
- 52 week high
- NT$260.00 on Jul 2, 2026
- 52 week low
- NT$45.71 on Nov 21, 2025
- Deepest drawdown
- -56.1% from Oct 25, 2024 to Nov 21, 2025, recovered Apr 24, 2026
- Best single session
- +30.4% on Nov 8, 2021
- Worst single session
- -19.7% on Nov 16, 2021
- Volatility, 1 year annualised
- 64.4%
- Sessions closing higher, 1 year
- 46%
- Growth of 1 since 2021
- 5.1×
- Best calendar year
- 2024, +75%
- Worst calendar year
- 2025, -19%
6658 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. 2021 starts on Nov 5, 2021; 2026 runs to Sep 24, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | NT$60.11 | NT$260.00 | NT$50.08 | NT$179.00 | +207.4% | 181.1M | 178 |
| 2025 | NT$72.71 | NT$93.30 | NT$45.71 | NT$58.23 | -19.5% | 339.5M | 242 |
| 2024 | NT$41.80 | NT$110.31 | NT$36.93 | NT$72.32 | +75.2% | 400.4M | 242 |
| 2023 | NT$35.63 | NT$50.29 | NT$34.88 | NT$41.27 | +18.6% | 14.7M | 239 |
| 2022 | NT$42.66 | NT$43.68 | NT$29.76 | NT$34.80 | -18.4% | 2.5M | 246 |
| 2021 | NT$26.61 | NT$78.94 | NT$26.61 | NT$42.66 | n/a | 6.6M | 40 |
6658 monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | NT$179.00 | +4.4% |
| August 2026 | NT$171.50 | +22.5% |
| July 2026 | NT$140.00 | -40.2% |
| June 2026 | NT$234.00 | +7.0% |
| May 2026 | NT$218.60 | +47.2% |
| April 2026 | NT$148.55 | +108.5% |
| March 2026 | NT$71.24 | +23.2% |
| February 2026 | NT$57.83 | +10.4% |
| January 2026 | NT$52.36 | -10.1% |
| December 2025 | NT$58.23 | +17.0% |
| November 2025 | NT$49.78 | -11.6% |
| October 2025 | NT$56.34 | -3.2% |
About the 6658 data
Daily bars. 1,187 sessions from Nov 5, 2021 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 29, 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 Nov 5, 2021, 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/6658/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on TWSE
Common questions
6658 share price history
