This activity is administrative and not a signal of insider sentiment. Traders should not interpret these transactions as bearish; monitor for actual open-market purchases or sales by insiders for directional signals.
Price Chart
Executive Summary
GLAUKOS Corp's President and COO, Joseph E. Gilliam, surrendered a total of 7,730 shares in two separate tax withholding transactions over the past week to cover tax obligations, valued at approximately $817,942 based on market prices. These transactions are non-cash, routine events related to vesting of equity awards and do not represent open-market selling of shares.
Key Financial Metrics
Key Facts
- President & COO Joseph E. Gilliam surrendered 7,730 shares in two tax withholding (Form 4 'F' code) transactions over 7 days.
- Total value of shares surrendered: $817,942 ($518,363 on 2026-03-24 and $299,579 on 2026-03-23).
- Transactions were not open-market sales; they were automatic share surrenders to cover tax liabilities upon vesting of equity awards.
- No open-market selling or purchasing activity by insiders in this cluster.
Financial Impact
$817,942 in non-cash share cancellations, representing 0.013% of market cap
Risk Factors
- Misinterpretation of tax withholding events as insider selling could create false bearish perception.
- Lack of open-market buying may reflect neutral sentiment, but not negative given the nature of the transactions.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CONTEXT: Insider Cluster Data (2 trades, 7d window) | cluster-GKOS-1774485638939 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 13, 2026 7w ago | Insider Cluster | $184.53 $171.09 | ▼ −7.28% | ▼ −5.29% | $164.42 (−10.90%) |
Aug 11, 2026 7w ago | Insider Cluster | $186.63 $170.38 | ▼ −8.71% | ▼ −6.81% | $164.42 (−11.90%) |
Aug 3, 2026 8w ago | 8-K | $170.87 $179.56 | ▲ +5.09% | ▲ +3.85% | $164.42 (−3.77%) |
Jul 9, 2026 12w ago | Insider Cluster | $155.07 $170.99 | ▲ +10.27% | ▲ +8.02% | $164.42 (+6.03%) |
May 4, 2026 21w ago | 8-K | $135.85 $103.12 | ▼ −24.09% | ▼ −29.74% | $164.42 (+21.03%) |
May 1, 2026 22w ago | Insider Cluster | $140.22 $103.12 | ▼ −26.46% | ▼ −31.74% | $164.42 (+17.26%) |
Mar 16, 2026 28w ago | Insider Cluster | $98.94 $120.52 | ▲ +21.81% | ▲ +18.03% | $164.42 (+66.18%) |
Mar 16, 2026 28w ago | Insider Cluster | $98.94 $120.52 | ▲ +21.81% | ▲ +18.03% | $164.42 (+66.18%) |
US Market Status
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