The cluster is small in both dollar value and insider seniority (directors only, no C-suite). Per the asymmetric calibration rule, insider sales are weak predictors — especially when driven by directors rather than executives. Monitor for any subsequent 8-K filings or earnings pre-announcements, but this cluster alone does not warrant a bearish stance. The historical calibration for this filing type shows score-6 reports have only a 42% chance of upward movement at T+20, reinforcing that this is a low-signal event.
Price Chart
Executive Summary
Two Amkor directors sold a combined $1.64M in open-market transactions over two days. Director Rutten sold $1.36M at $54.50 and Director Alexander sold $279K at $55.81, the latter also exercising a derivative. While the dollar amount is modest relative to Amkor's $13.5B market cap (0.01%), the cluster of two directors selling within a week warrants attention, though insider sales are generally less predictive than buys per academic literature. The historical calibration for this filing type shows mixed outcomes, with score-6 reports having only a 42% observed probability of upward movement at T+20, suggesting caution in over-interpreting this cluster.
Key Financial Metrics
Key Facts
- Two directors sold a total of 30,000 shares worth $1.64M in open-market transactions on August 6-7, 2026.
- Director Rutten sold 25,000 shares at $54.50 for $1.36M; Director Alexander sold 5,000 shares at $55.81 for $279K.
- Total sales represent approximately 0.01% of Amkor's $13.5B market cap, well below the 0.1% threshold for materiality.
- Director Alexander also exercised 5,000 derivative shares at $8.51 and received 5,000 shares via non-cash derivative exercise.
- No C-suite executives (CEO, CFO, etc.) participated in the selling, reducing the informational signal strength.
Financial Impact
Total insider sales of $1.64M represent 0.01% of market cap — trivial relative to company size.
Risk Factors
- Insider sales could precede negative company news, though the small size and director-only participation reduce this risk.
- The derivative exercises by Alexander suggest tax-related selling, not necessarily a bearish view on the stock.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMKR-1786521772452 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 19, 2026 6w ago | Insider Cluster | $50.89 $47.95 | ▼ −5.78% | ▼ −3.83% | $56.19 (+10.41%) |
Aug 13, 2026 7w ago | Insider Cluster | $57.75 $51.73 | ▼ −10.42% | ▼ −8.68% | $56.19 (−2.70%) |
Aug 11, 2026 7w ago | Insider Cluster | $54.30 $51.35 | ▼ −5.43% | ▼ −4.37% | $56.19 (+3.48%) |
Aug 7, 2026 8w ago | Insider Cluster | $55.27 $47.77 | ▼ −13.57% | ▼ −13.17% | $56.19 (+1.66%) |
Aug 3, 2026 8w ago | Institutional Cluster | $50.84 $47.30 | ▼ −6.96% | ▼ −8.20% | $56.19 (+10.52%) |
Jul 27, 2026 9w ago | 8-K | $45.69 $48.70 | ▲ +6.59% | ▲ +3.21% | $56.19 (+22.98%) |
Jul 23, 2026 10w ago | Institutional Cluster | $65.33 $50.86 | ▼ −22.15% | ▼ −25.46% | $56.19 (−13.99%) |
Jul 20, 2026 10w ago | Insider Cluster | $62.56 $61.30 | ▼ −2.01% | ▼ −6.13% | $56.19 (−10.18%) |
Jul 20, 2026 10w ago | Insider Cluster | $62.56 $61.30 | ▼ −2.01% | ▼ −6.13% | $56.19 (−10.18%) |
May 21, 2026 19w ago | 8-K | $65.90 $93.63 | ▲ +42.07% | ▲ +41.74% | $56.19 (−14.73%) |
US Market Status
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