Navratil Tomas Insider Trading Activity
Navratil Tomas has been net-selling over the last 12 months with 0 purchases and 14 sales across 1 company.
GKOS is the most-traded position with 14 trades. The largest single transaction was a sale of GKOS for $144K on Apr 10, 2026.
Performance Scorecard
Forward stock performance after each transaction by Navratil Tomas. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | -7.5% | 42% | 12 |
| 90 days | — | -32.3% | 0% | 12 |
| 120 days | — | -48.1% | 0% | 12 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersGKOS · GLAUKOS Corp
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
Sep 16, 2026 | GKOS | Sell | 460 | $167.32 | $77K | −0.6% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 103 | $163.20 | $17K | −0.1% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 345 | $164.60 | $57K | −0.5% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 191 | $166.20 | $32K | −0.3% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 120 | $168.38 | $20K | −0.2% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 234 | $170.95 | $40K | −0.3% | CHIEF DEVELOPMENT OFFICER | |
Sep 16, 2026 | GKOS | Sell | 4 | $172.00 | $688 | −0.0% | CHIEF DEVELOPMENT OFFICER | |
Apr 10, 2026 | GKOS | Sell | 32 | $120.23 | $4K | −0.0% | CHIEF DEVELOPMENT OFFICER | |
Apr 10, 2026 | GKOS | Sell | 614 | $119.35 | $73K | −0.7% | CHIEF DEVELOPMENT OFFICER | |
Apr 10, 2026 | GKOS | Sell | 210 | $117.45 | $25K | −0.2% | CHIEF DEVELOPMENT OFFICER | |
Apr 10, 2026 | GKOS | Sell | 1,237 | $116.72 | $144K | −1.3% | CHIEF DEVELOPMENT OFFICER | |
Mar 16, 2026 Filed 3d late | GKOS | Sell | 272 | $99.05 | $27K | −0.4% | CHIEF DEVELOPMENT OFFICER | |
Mar 16, 2026 Filed 3d late | GKOS | Sell | 460 | $97.33 | $45K | −0.6% | CHIEF DEVELOPMENT OFFICER | |
Mar 16, 2026 Filed 3d late | GKOS | Sell | 299 | $98.21 | $29K | −0.4% | CHIEF DEVELOPMENT OFFICER | |
Sep 22, 2025 | GKOS | Sell | 276 | $84.70 | $23K | −0.4% | CHIEF DEVELOPMENT OFFICER | |
Sep 22, 2025 | GKOS | Sell | 218 | $83.76 | $18K | −0.3% | CHIEF DEVELOPMENT OFFICER | |
Sep 22, 2025 | GKOS | Sell | 23 | $82.79 | $2K | −0.0% | CHIEF DEVELOPMENT OFFICER | |
Sep 11, 2025 | GKOS | Sell | 1,948 | $88.61 | $173K | −2.5% | CHIEF DEVELOPMENT OFFICER | |
Sep 11, 2025 | GKOS | Sell | 3,194 | $87.98 | $281K | −4.0% | CHIEF DEVELOPMENT OFFICER |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| GKOS | GLAUKOS Corp | 19 | $1.1M |
Other insiders at GLAUKOS Corp
5 other tracked filers at GKOS.