The CEO and CTO both sold shares in the same week, which is a bearish signal for a high-growth stock. While the dollar amount is modest relative to market cap, the involvement of top executives and the cross-filing amplifier context warrant caution. Monitor for any upcoming negative news or guidance revision that may have prompted the sales.
Price Chart
Executive Summary
Four Amprius insiders, including the CEO and CTO, sold a total of $2.28M in shares over a 7-day window. The CEO and a director sold ~$1.9M combined at ~$14.79 on May 21, while the CTO and another director sold ~$375K at higher prices later in the week. At a $2.4B market cap, the total represents ~0.1% of market cap — a modest but notable cluster, amplified by C-suite participation and the cross-filing context of recent earnings and press activity.
Key Financial Metrics
Key Facts
- CEO Thomas Stepien sold 60.7K shares for $898K on May 21 at $14.79.
- Director Sun Kang sold 67.8K shares for $1.00M on May 21 at $14.79.
- CTO Stefan Ionel sold 3.2K shares for $55K on May 27 at $17.19.
- Director Donald Dixon sold 17.9K shares for $320K on May 26 at $17.90.
- Total insider sales of $2.28M represent ~0.1% of $2.4B market cap.
- All four trades were open-market sales (code S); no 10b5-1 plan pattern is evident from the data.
- Cross-filing context includes recent earnings and press activity, which the actuarial model flags as amplifiers for insider sales.
Financial Impact
Total insider sales of $2.28M, or ~0.1% of market cap.
Risk Factors
- CEO and CTO selling concurrently may signal insider concern about near-term valuation or business outlook.
- The stock has rallied significantly (prior reports show large positive moves), increasing the risk of a pullback.
- No 10b5-1 plan identified — sales appear discretionary.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMPX-1780006411015 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 9, 2026 17d ago | S-3ASR | $8.87 | awaiting T+60 | — | $8.35 (−5.86%) |
Sep 25, 2026 4w ago | 8-K | $9.60 | awaiting T+60 | — | $8.35 (−13.02%) |
Aug 25, 2026 8w ago | Insider Cluster | $10.20 | awaiting T+60 | — | $8.35 (−18.14%) |
Aug 13, 2026 10w ago | 8-K | $12.51 | awaiting T+60 | — | $8.35 (−33.25%) |
Aug 1, 2026 12w ago | Institutional Cluster | $10.12 | awaiting T+60 | — | $8.35 (+17.49%) |
Jun 11, 2026 19w ago | Insider Cluster | $16.31 $10.39 | ▼ −36.30% | ▼ −39.56% | $8.35 (−48.80%) |
Jun 11, 2026 19w ago | Institutional Cluster | $17.10 $9.89 | ▼ −42.16% | ▼ −46.56% | $8.35 (−51.17%) |
Jun 8, 2026 20w ago | 144 | $4.84 | awaiting T+60 | — | $8.35 (−72.52%) |
May 28, 2026 21w ago | 144 | — | awaiting T+60 | — | — |
May 28, 2026 21w ago | Insider Cluster | $20.28 $9.86 | ▲ +51.38% | ▲ +52.56% | $8.35 (+58.83%) |
US Market Status
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