SOUTH KOREA · OPENDART
Sphere Corp.
스피어 · 347700 · KOSDAQ · Healthcare · Health Information Services
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insider timeline
2 insiders bought on the same day, 31 Aug: 2 Executive. 2 of them bought again later. The share closed at 21,000.00 that day and at 20,900.00 most recently (−0.5%).
Tap an item for what it means.
●A purchase: the bigger the dot, the more was bought
Each dot is one insider's purchases on one day. The dot's area follows the amount: the largest purchase here gets the largest dot. Hold the pointer over a dot to see the date and the amount.
×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.
▮Purple band: several insiders bought within 15 days
The band marks the stretch with the most different buyers: at most 15 days long and at least two people. Here it is 31 Aug, with 2 insiders. Only the strongest stretch is marked. Several people deciding the same thing is harder to explain by one person's private reasons, but insiders often buy together just after a closed period ends, so compare it with the grey weekly bars.
Blue line: this share's price, −52.8% over these six months
The closing price of each day, from 44,250.00 on 2026-04-21 to 20,900.00 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 −52.8%, the typical one −31.9%, 20.9 points behind. It is not an index and not a comparison within one industry.
This company: insiders buying per month, last 12 months
Darker bars are inside the 180-day window above.
Who traded
| Insider | Role | Purchases | Sales | Bought | First purchase | Share price since |
|---|---|---|---|---|---|---|
| Choi Byung Chul | Executive | 2 | — | 15.2M KRW | 2026-08-31 | −0.5% |
| Yoon Sang-hyeon | Executive | 2 | — | 15.0M KRW | 2026-08-31 | −0.5% |
| Andrew Thomas Ermatinger | Executive | — | 1 | — | — | — |
Purchases against sales
Shares of the reported value of insider transactions in the 180-day window. Sales include disposals for tax, at option exercise or under a pre-set plan, which say little about an insider's view. The split describes what was disclosed; it is not a signal.
Insiders' buying price vs the latest close
Insiders paid 23,445.74 KRW a share on average (4 purchase lines, 2 buyers, 2026-08-31 – 2026-10-07). The close on 2026-10-16 was 10.9% below that price.
The latest purchase (2026-10-07) was at 25,100.00 KRW; the close was 16.7% below that price.
Prices paid are weighted by shares and taken from the filings; dividends are not counted. Not scored.
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.
| Trade date | Insider | Role | Trade | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-07 | Choi Byung Chul | Vice president | Bought on the exchange | 400 | ₩25,300 | ₩10.1M | DART ↗ |
| 2026-10-07 | Yoon Sang-hyeon | Managing director | Bought on the exchange | 400 | ₩24,900 | ₩10.0M | DART ↗ |
| 2026-10-06 | Andrew Thomas Ermatinger | Vice president | Sold on the exchange | 75,000 | ₩26,600 | ₩2.0B | DART ↗ |
| 2026-08-31 | Choi Byung Chul | Vice president | Bought on the exchange | 250 | ₩20,500 | ₩5.1M | DART ↗ |
| 2026-08-31 | Yoon Sang-hyeon | Managing director | Bought on the exchange | 240 | ₩21,000 | ₩5.0M | DART ↗ |
| 2026-03-03 | Edward Shin | Vice president | Sold on the exchange | 600 | ₩44,400 | ₩26.6M | DART ↗ |
| 2026-02-26 | Choi Jin Haeng | President | Sold on the exchange | 25,000 | ₩42,463 | ₩1.1B | DART ↗ |
| 2026-02-20 | Yoon Sang-hyeon | Managing director | Sold on the exchange | 10,000 | ₩43,872 | ₩438.7M | DART ↗ |
| 2026-02-20 | Choi Byung Chul | Vice president | Sold on the exchange | 10,000 | ₩42,800 | ₩428.0M | DART ↗ |
| 2025-12-29 | Edward Shin | Vice president | Sold on the exchange | 500 | ₩19,090 | ₩9.5M | DART ↗ |
Other changes in holdings · 12
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 |
|---|---|---|---|---|---|
| 2026-04-30 | Choi Gwang-su | CEO | Others(+) | 222,573 | DART ↗ |
| 2026-02-12 | Edward Shin | Vice president | Treasury stock bonus(+) | 1,000 | DART ↗ |
| 2026-02-12 | Choi Jin Haeng | President | Treasury stock bonus(+) | 25,000 | DART ↗ |
| 2026-02-12 | Yoon Sang-hyeon | Managing director | Treasury stock bonus(+) | 20,000 | DART ↗ |
| 2026-02-12 | Choi Byung Chul | Vice president | Treasury stock bonus(+) | 20,000 | DART ↗ |
| 2026-02-03 | Andrew Thomas Ermatinger | Vice president | Treasury stock bonus(+) | 100,000 | DART ↗ |
| 2026-01-30 | Choi Gwang-su | CEO | Others(+) | 520,650 | DART ↗ |
| 2025-06-30 | KIM MIKE TAE KYUNG | President | Executive retirement(-) | 1,481,481 | DART ↗ |
| 2025-06-02 | Edward Shin | Vice president | New report(+) | 500 | DART ↗ |
| 2025-03-04 | Choi Gwang-su | CEO | Merger(+) | 13,991,769 | DART ↗ |
| 2025-03-04 | KIM MIKE TAE KYUNG | President | Merger(+) | 1,481,481 | DART ↗ |
| 2025-03-04 | Sphere Korea Inc. | 10% shareholder | Merger(-) | 3,615,686 | DART ↗ |