Lightron Fiber-Optic Devices Inc. Stock: price and insider trades · South Korea
빛과전자
No insider purchase over the last 90 days. The latest, by 에스디비조합, was filed 24 Apr 2026.
Lightron Fiber-Optic Devices Inc.: what insiders have been doing
This page follows insider dealings at Lightron Fiber-Optic Devices Inc. as filed with DART (FSS), a company from the Technology sector. The last twelve months, up to 27 October 2026, brought 19 filings signed by 10 insiders.
The record shows 8 purchases on the open market worth €27.4M, made by 6 insiders, against 9 sales worth €31.5M by 4 insiders. No amount is published for 13 filings, which the totals therefore leave out. Buying on the open market means paying the going price with one's own funds, a different act from receiving shares as pay. The largest single trade was a purchase of €22.1M by Csa 코스믹, published on 17 April 2026, equal to 13.4% of the market capitalisation.
In the case of 1 purchase, another manager of the company was buying within the same 30 days. Such overlaps are known as a cluster signal: distinct people reaching the same decision at about the same time. The last purchase on record was published on 24 April 2026, which is 199 days ago. Between a trade and the moment it shows up on DART (FSS), the median delay is 2 days. The shorter that gap, the sooner other investors can see what insiders have done. A sale on its own says little: insiders also sell to pay tax, fund a purchase or diversify.
For context, the typical company on the same exchange (median of 2,652 companies) published 7 filings over the same period, against 19 filings here. Our records for Lightron Fiber-Optic Devices Inc. go back to 2021, with 18 purchases and 42 sales on the open market in total.
Other companies in the same sector with recent insider buying flagged by our signals: Lime Technologies AB (publ). Source: insider filings from DART (FSS). Past trades are no guide to future returns.
Who traded when
BuySale+4 other insiders
Since the insiders bought
- -39.4%Entry ₩5,580 · Close 23 Oct 2026 ₩3,380
- -48.2%Entry ₩6,520 · Close 23 Oct 2026 ₩3,380
- +338.2%Entry ₩1,100 · Close at T+90 ₩4,820
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2025FY ended December 2025 · cache
- 3,857,000 sharesShareKRXDART:20261027000370
- Other0DART
- 5,330,879 sharesShareKRXDART:20261015000423
- Other0DART
- Other0DART
- Other0DART
- 1,120,000 sharesShareKRXDART:20260904000524
- Other0DART
- Other0DART
- 1,968,067 sharesKRXDART:20260609000435
- ●Executives0DART
- 4,564,048 shares8.78% mcap100.0% of flowKRXDART:20260513000841
- 5,649,717 shares10.41% mcap100.0% of flowKRXDART:20260424000693
- 1,773,049 shares3.27% mcap100.0% of flowKRXDART:20260424000743Canonical exit: 16 Jul 2026 (T+90)
- 6,568,144 shares13.44% mcap100.0% of flowKRXDART:20260417000681Canonical exit: 16 Jul 2026 (T+90)
- ●Executives0DART
- 33,806,959 sharesKRXDART:20260205000449Canonical exit: 6 May 2026 (T+90)
- 11,001,642 sharesKRXDART:20260205000595Canonical exit: 29 Apr 2026 (T+90)
- 11,967,879 sharesKRXDART:20260205000479
- 11,001,642 sharesShareKRXDART:20260205000598Canonical exit: 6 May 2026 (T+90)
- 21,839,080 sharesShareKRXDART:20260205000453Canonical exit: 6 May 2026 (T+90)
- 3,160,210 sharesKRXDART:20260114000128
- 3,250,000 sharesShareKRXDART:20260114000132
- 5,649,717 sharesKRXDART:20251231000547Canonical exit: 29 Mar 2026 (T+90)
- 10,254 sharesKRXDART:20251230000144Canonical exit: 29 Mar 2026 (T+90)
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About Lightron Fiber-Optic Devices Inc.
빛과전자 is a technology company listed on the XKRX. It specializes in developing innovative electronic solutions.
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