No.2
Disclosure
2026/11/07 02:05
四半期報告書（10-Q）
KOP Koppers Holdings Inc.US-listed
2 posts
Koppers Holdings Inc. stock plunged on Nov 6: what happened
It closed at $29.97 on Nov 6 (−$9.67, −24.39%), ranking #13 among the top losers of 5,526 US stocks priced $1 or more.
Disclosures around that day
- 11/06 12:0510-Q
- 11/06 08:138-K 決算発表（経営成績・財政状態）（Item 2.02）／財務諸表および添付資料（Item 9.01）
Changes are calculated from the closing prices this site collects daily. Please make your own investment decisions.
Koppers Holdings Inc. (KOP) at a glance
Prices are from Yahoo! Finance and may be delayed. Always check the latest price before trading.
Koppers Holdings Inc. (KOP) Stock Price History
Koppers Holdings Inc. closed at $29.97 on Nov 6, 2026, −34.9% over 1 month, +12.2% over 1 year.
Price5-day MA25-day MAS&P 500Disclosures
1-Month High$46.03Oct 6
1-Month Low$29.97Nov 6
1-Week Change−27.8%vs Oct 30
1-Month Change−34.9%vs Oct 6
If you had invested $1,000 1 month ago, it would be worth $651 today (−34.9%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved −5.7%, while this stock moved −34.9%.
Last 10 Trading Days
| Date | Close | Change | % Change |
|---|---|---|---|
| Nov 6 (Fri) | $29.97 | −9.67 | −24.39% |
| Nov 5 (Thu) | $39.64 | −3.25 | −7.58% |
| Nov 4 (Wed) | $42.89 | +1.09 | +2.61% |
| Nov 3 (Tue) | $41.80 | −0.03 | −0.07% |
| Nov 2 (Mon) | $41.83 | +0.33 | +0.80% |
| Oct 30 (Fri) | $41.50 | −0.36 | −0.86% |
| Oct 29 (Thu) | $41.86 | −0.22 | −0.52% |
| Oct 28 (Wed) | $42.08 | +0.64 | +1.54% |
| Oct 27 (Tue) | $41.44 | +1.61 | +4.04% |
| Oct 26 (Mon) | $39.83 | −0.35 | −0.87% |
Price5-day MA25-day MAS&P 500Disclosures
3-Month High$52.33Aug 6
3-Month Low$29.97Nov 6
1-Month Change−34.9%vs Oct 6
3-Month Change−42.7%vs Aug 6
If you had invested $1,000 3 months ago, it would be worth $573 today (−42.7%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved −4.3%, while this stock moved −42.7%.
Last 10 Trading Days
| Date | Close | Change | % Change |
|---|---|---|---|
| Nov 6 (Fri) | $29.97 | −9.67 | −24.39% |
| Nov 5 (Thu) | $39.64 | −3.25 | −7.58% |
| Nov 4 (Wed) | $42.89 | +1.09 | +2.61% |
| Nov 3 (Tue) | $41.80 | −0.03 | −0.07% |
| Nov 2 (Mon) | $41.83 | +0.33 | +0.80% |
| Oct 30 (Fri) | $41.50 | −0.36 | −0.86% |
| Oct 29 (Thu) | $41.86 | −0.22 | −0.52% |
| Oct 28 (Wed) | $42.08 | +0.64 | +1.54% |
| Oct 27 (Tue) | $41.44 | +1.61 | +4.04% |
| Oct 26 (Mon) | $39.83 | −0.35 | −0.87% |
Price25-day MA75-day MAS&P 500Disclosures
6-Month High$52.33Aug 6
6-Month Low$29.97Nov 6
3-Month Change−42.7%vs Aug 6
6-Month Change−28.0%vs May 6
If you had invested $1,000 6 months ago, it would be worth $720 today (−28.0%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved +0.2%, while this stock moved −28.0%.
Monthly Closes
| Month | Month-End Close | Monthly % |
|---|---|---|
| Nov 2026 | $29.97 | −27.8% |
| Oct 2026 | $41.50 | −9.0% |
| Sep 2026 | $45.59 | −0.6% |
| Aug 2026 | $45.87 | −6.4% |
| Jul 2026 | $49.02 | +9.2% |
| Jun 2026 | $44.90 | +10.0% |
| May 2026 | $40.80 | −0.1% |
Price25-day MA75-day MAS&P 500Disclosures
52-Week High$52.33Aug 6
52-Week Low$26.67Jan 2
Year to Date+10.7%vs Dec 31
From 52-Week High−42.7%Aug 6
If you had invested $1,000 1 year ago, it would be worth $1,122 today (+12.2%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved +9.6%, while this stock moved +12.2%.
Monthly Closes
| Month | Month-End Close | Monthly % |
|---|---|---|
| Nov 2026 | $29.97 | −27.8% |
| Oct 2026 | $41.50 | −9.0% |
| Sep 2026 | $45.59 | −0.6% |
| Aug 2026 | $45.87 | −6.4% |
| Jul 2026 | $49.02 | +9.2% |
| Jun 2026 | $44.90 | +10.0% |
| May 2026 | $40.80 | −0.1% |
| Apr 2026 | $40.83 | +5.6% |
| Mar 2026 | $38.68 | +2.3% |
| Feb 2026 | $37.80 | +28.3% |
| Jan 2026 | $29.46 | +8.8% |
| Dec 2025 | $27.08 | −8.7% |
| Nov 2025 | $29.67 | ― |
Price13-week MA26-week MAS&P 500
3-Year High$56.06Apr 1, 2024
3-Year Low$24.88Apr 14, 2025
Annualized Return−10.2%
Max Drawdown−55.6%
If you had invested $1,000 3 years ago, it would be worth $725 today (−27.5%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved +67.1%, while this stock moved −27.5%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | $29.97 | +10.7% |
| 2025 | $27.08 | ― |
Price13-week MA26-week MAS&P 500
5-Year High$56.06Apr 1, 2024
5-Year Low$20.78Sep 26, 2022
Annualized Return−2.8%
Max Drawdown−55.6%
If you had invested $1,000 5 years ago, it would be worth $866 today (−13.4%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved +57.5%, while this stock moved −13.4%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | $29.97 | +10.7% |
| 2025 | $27.08 | ― |
Price1-year MA2-year MAS&P 500
All-Time High$56.62Feb 2024
All-Time Low$12.37Mar 2020
Total Change+58.6%vs Feb 2006
Annualized Return+2.2%
If you had invested $1,000 in Feb 2006, it would be worth $1,586 today (+58.6%).Price change only; dividends and fees are not included.
Over the same period the S&P 500 moved +476.0%, while this stock moved +58.6%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | $29.97 | +10.7% |
| 2025 | $27.08 | −16.4% |
| 2024 | $32.40 | −36.7% |
| 2023 | $51.22 | +81.6% |
| 2022 | $28.20 | −9.9% |
| 2021 | $31.30 | +0.4% |
| 2020 | $31.16 | −18.5% |
| 2019 | $38.22 | +124.3% |
| 2018 | $17.04 | −66.5% |
| 2017 | $50.90 | +26.3% |
| 2016 | $40.30 | +120.8% |
| 2015 | $18.25 | −29.8% |
| 2014 | $25.98 | −43.2% |
| 2013 | $45.75 | +19.9% |
| 2012 | $38.15 | +11.0% |
| 2011 | $34.36 | −4.0% |
| 2010 | $35.78 | +17.5% |
| 2009 | $30.44 | +40.8% |
| 2008 | $21.62 | −50.0% |
| 2007 | $43.24 | +65.9% |
| 2006 | $26.07 | ― |
Daily, weekly and monthly closes (Yahoo! Finance, split-adjusted, dividends excluded). "All" covers the range Yahoo provides (from Feb 2006). Please check the latest prices before trading.
Recent SEC filings (EDGAR)
- 11/06 12:05 10-Q
- 11/06 08:13 8-K 決算発表（経営成績・財政状態）（Item 2.02）／財務諸表および添付資料（Item 9.01）
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No.1
Disclosure
2026/11/06 22:13
臨時報告（重要事象）（8-K）
決算発表（経営成績・財政状態）（Item 2.02）／財務諸表および添付資料（Item 9.01）
決算発表（経営成績・財政状態）（Item 2.02）／財務諸表および添付資料（Item 9.01）
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