SOUTH KOREA · OPENDART
TAIHAN Fiberoptics Co.,LTD
대한광통신 · 010170 · KOSDAQ · Technology · Communication Equipment
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insider timeline
No purchase in the last 180 days; 2 insiders sold.
Tap an item for what it means.
×A sale
A cross is one insider's sales on one day. People sell to pay tax, to cash in share awards or to hold less of one company, so a sale says less than a purchase does. When someone bought and sold on the same day, the cross sits beside the dot. The totals are under “Purchases against sales” below.
Blue line: this share's price, −15.0% over these six months
The closing price of each day, from 15,700.00 on 2026-04-21 to 13,340.00 on 2026-10-16. The line has no scale; read it for high and low: a dot on a low stretch was bought cheaply, a dot on a high stretch was not.
Dashed line: the typical stock on the same exchange, −31.9%
Taken from the 1525 other stocks on the same exchange that this site holds prices for. Each is measured from the first day of the window, and every day the middle one is drawn. It starts where the blue line starts, so the gap between the two is the difference: this share −15.0%, the typical one −31.9%, 16.8 points ahead. It is not an index and not a comparison within one industry.
Who traded
| Insider | Role | Purchases | Sales | Bought | First purchase | Share price since |
|---|---|---|---|---|---|---|
| Sull Yoon Suk | CEO / chair | — | 1 | — | — | — |
| Sull Yoon Sung | Role not classified | — | 1 | — | — | — |
Insider trades on the exchange
Purchases and sales on the exchange in the last 12 months. The filing gives the settlement date; the trade date is two trading days earlier.
Other changes in holdings · 20
Option exercises, grants, new shares, inheritance, gifts, off-exchange trades and trades by companies and funds. Not counted in the score.
| Date | Insider | Role | Reason | Shares | Filing |
|---|---|---|---|---|---|
| 2026-07-03 | TFO Industry | 10% shareholder | Disposal in exchange(-) | 34,423 | DART ↗ |
| 2026-07-02 | TFO Industry | 10% shareholder | Disposal in exchange(-) | 590,437 | DART ↗ |
| 2026-06-29 | TFO Industry | 10% shareholder | Disposal in exchange(-) | 512,000 | DART ↗ |
| 2026-06-26 | TFO Industry | 10% shareholder | Disposal in exchange(-) | 250,000 | DART ↗ |
| 2026-06-25 | TFO Industry | 10% shareholder | Disposal in exchange(-) | 250,000 | DART ↗ |
| 2026-03-09 | Sull Yoon Suk | CEO | Others(-) | 89,167 | DART ↗ |
| 2026-03-09 | Sull Yoon Suk | CEO | Others(-) | 713,334 | DART ↗ |
| 2026-03-09 | Sull Yoon Suk | CEO | Acquisition of paid-in new shares(+) | 713,334 | DART ↗ |
| 2026-03-09 | TFO Industry | 10% shareholder | Others(-) | 73,982 | DART ↗ |
| 2026-03-09 | TFO Industry | 10% shareholder | Others(-) | 591,860 | DART ↗ |
| 2026-03-09 | TFO Industry | 10% shareholder | Acquisition in exchange(+) | 591,860 | DART ↗ |
| 2026-02-02 | Sull Yoon Suk | CEO | Disposal in OTC(-) | 761,886 | DART ↗ |
| 2026-02-02 | TFO Industry | 10% shareholder | Disposal in OTC(-) | 1,246,137 | DART ↗ |
| 2026-01-23 | TFO Industry | 10% shareholder | Others(+) | 1,911,979 | DART ↗ |
| 2026-01-23 | Sull Yoon Suk | CEO | Others(+) | 1,564,387 | DART ↗ |
| 2025-02-19 | Sull Yoon Suk | CEO | Acquisition of paid-in new shares(+) | 3,361,661 | DART ↗ |
| 2006-05-12 | Sull Yoon Sung | 10% shareholder | Acquisition of new shares without compensation(+) | 189,984 | DART ↗ |
| 2004-09-16 | Sull Yoon Sung | 10% shareholder | Others(-) | 474,960 | DART ↗ |
| 2004-09-16 | Sull Yoon Sung | 10% shareholder | Others(+) | 474,960 | DART ↗ |
| 2001-12-15 | Sull Yoon Sung | 10% shareholder | Acquisition of new shares without compensation(+) | 158,320 | DART ↗ |