4398 BroadBand Security,Inc.ブロードバンドセキュリティTSE Standard / Information & Communication
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BroadBand Security,Inc. stock plunged on Oct 28: what happened
It closed at ¥2,767 on Oct 28 (−¥503, −15.38%), ranking #13 among the top losers of all stocks on the Tokyo Stock Exchange.
No disclosures were found for this stock around that day. Share what you know in the posts below.
Changes are calculated from the closing prices this site collects daily; limit-up/down is an estimate based on the daily price limit. Please make your own investment decisions.
BroadBand Security,Inc. (4398) at a glance
Prices are from Yahoo! Finance and may be delayed. Always check the latest price before trading.
BroadBand Security,Inc. (4398) Stock Price History
BroadBand Security,Inc. closed at ¥2,544 on Oct 30, 2026, +77.8% over 1 month, +77.9% over 1 year.
If you had invested ¥100,000 1 month ago, it would be worth ¥177,778 today (+77.8%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved −5.2%, while this stock moved +77.8%.
Last 10 Trading Days
| Date | Close | Change | % Change |
|---|---|---|---|
| Oct 30 (Fri) | ¥2,544 | −141 | −5.25% |
| Oct 29 (Thu) | ¥2,685 | −82 | −2.96% |
| Oct 28 (Wed) | ¥2,767 | −503 | −15.38% |
| Oct 27 (Tue) | ¥3,270 | +503 | +18.18% |
| Oct 26 (Mon) | ¥2,767 | +84 | +3.13% |
| Oct 23 (Fri) | ¥2,683 | −275 | −9.30% |
| Oct 22 (Thu) | ¥2,958 | +500 | +20.34% |
| Oct 21 (Wed) | ¥2,458 | +254 | +11.52% |
| Oct 20 (Tue) | ¥2,204 | −259 | −10.52% |
| Oct 19 (Mon) | ¥2,463 | −133 | −5.12% |
If you had invested ¥100,000 3 months ago, it would be worth ¥204,010 today (+104.0%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +2.3%, while this stock moved +104.0%.
Last 10 Trading Days
| Date | Close | Change | % Change |
|---|---|---|---|
| Oct 30 (Fri) | ¥2,544 | −141 | −5.25% |
| Oct 29 (Thu) | ¥2,685 | −82 | −2.96% |
| Oct 28 (Wed) | ¥2,767 | −503 | −15.38% |
| Oct 27 (Tue) | ¥3,270 | +503 | +18.18% |
| Oct 26 (Mon) | ¥2,767 | +84 | +3.13% |
| Oct 23 (Fri) | ¥2,683 | −275 | −9.30% |
| Oct 22 (Thu) | ¥2,958 | +500 | +20.34% |
| Oct 21 (Wed) | ¥2,458 | +254 | +11.52% |
| Oct 20 (Tue) | ¥2,204 | −259 | −10.52% |
| Oct 19 (Mon) | ¥2,463 | −133 | −5.12% |
If you had invested ¥100,000 6 months ago, it would be worth ¥206,829 today (+106.8%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +6.8%, while this stock moved +106.8%.
Monthly Closes
| Month | Month-End Close | Monthly % |
|---|---|---|
| Oct 2026 | ¥2,544 | +77.8% |
| Sep 2026 | ¥1,431 | +10.8% |
| Aug 2026 | ¥1,291 | +4.1% |
| Jul 2026 | ¥1,240 | −0.2% |
| Jun 2026 | ¥1,242 | −2.4% |
| May 2026 | ¥1,273 | +3.5% |
| Apr 2026 | ¥1,230 | +0.1% |
If you had invested ¥100,000 1 year ago, it would be worth ¥177,902 today (+77.9%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +23.3%, while this stock moved +77.9%.
Monthly Closes
| Month | Month-End Close | Monthly % |
|---|---|---|
| Oct 2026 | ¥2,544 | +77.8% |
| Sep 2026 | ¥1,431 | +10.8% |
| Aug 2026 | ¥1,291 | +4.1% |
| Jul 2026 | ¥1,240 | −0.2% |
| Jun 2026 | ¥1,242 | −2.4% |
| May 2026 | ¥1,273 | +3.5% |
| Apr 2026 | ¥1,230 | +0.1% |
| Mar 2026 | ¥1,229 | −8.5% |
| Feb 2026 | ¥1,343 | −5.8% |
| Jan 2026 | ¥1,426 | −1.1% |
| Dec 2025 | ¥1,442 | −3.8% |
| Nov 2025 | ¥1,499 | +6.2% |
| Oct 2025 | ¥1,412 | ― |
If you had invested ¥100,000 3 years ago, it would be worth ¥184,615 today (+84.6%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +98.1%, while this stock moved +84.6%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | ¥2,544 | +76.4% |
| 2025 | ¥1,442 | ― |
If you had invested ¥100,000 5 years ago, it would be worth ¥184,615 today (+84.6%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +113.7%, while this stock moved +84.6%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | ¥2,544 | +76.4% |
| 2025 | ¥1,442 | ― |
If you had invested ¥100,000 in Sep 2018, it would be worth ¥118,381 today (+18.4%).Price change only; dividends and fees are not included.
Over the same period the Nikkei 225 moved +162.4%, while this stock moved +18.4%.
Yearly Closes
| Year | Year-End Close | Yearly % |
|---|---|---|
| 2026 (YTD) | ¥2,544 | +76.4% |
| 2025 | ¥1,442 | +2.5% |
| 2024 | ¥1,407 | +5.1% |
| 2023 | ¥1,339 | +0.9% |
| 2022 | ¥1,327 | +11.3% |
| 2021 | ¥1,192 | −44.0% |
| 2020 | ¥2,127 | +38.9% |
| 2019 | ¥1,531 | −1.2% |
| 2018 | ¥1,550 | ― |
Daily, weekly and monthly closes (Yahoo! Finance, split-adjusted, dividends excluded). "All" covers the range Yahoo provides (from Sep 2018). Please check the latest prices before trading.
BroadBand Security,Inc. (4398) financial indicators
PER, ROE and dividend yield are based on company forecasts, calculated from earnings reports and the closing price after each trading day.
BroadBand Security,Inc. in Kabutaro's Daily Blog
- Oct 6, 2026 Japan Stock of the Day: On October 6, 2026, the most talked-about Japanese stock online was BroadBand Security <4398>.
Days when Kabutaro's daily blog featured this stock.
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