The simultaneous CEO/CTO sale at identical prices suggests a coordinated exit or a shared response to a blackout-window opening. Monitor for an upcoming earnings release, material agreement, or offering — the cross-filing actuarial verdicts flag cluster-insider-trades + cluster-offering-context and cluster-insider-trades + cluster-press-context as amplifiers. If the stock breaks below $14.50, the cluster may signal near-term weakness. Conversely, if no negative catalyst emerges within 10 trading days, the selling may be purely liquidity-driven.
Price Chart
Executive Summary
Three Amprius insiders — the CEO, CTO, and a director — collectively sold $2.33M in open-market shares on May 21, 2026, all at ~$14.79. This is the largest insider selling cluster in the trailing 30 days ($2.33M vs. $2.3M prior), representing ~0.1% of the $2.3B market cap. While the dollar amount is modest relative to market cap, the simultaneous sale by the CEO and CTO — the two most operationally informed executives — on the same day at the same price raises a caution flag, especially given the stock's recent run and the 93% bullish analyst consensus.
Key Financial Metrics
Key Facts
- CEO Stepien Thomas M sold 60,702 shares for $898K on May 21, 2026.
- CTO Stefan Constantin Ionel sold 28,812 shares for $426K on May 21, 2026.
- Director Sun Kang sold 67,796 shares for $1.00M on May 21, 2026.
- Total cluster value: $2.33M, or ~0.1% of AMPX's $2.3B market cap.
- All three sales were open-market (code S) at the same price of $14.7884.
- Prior 30-day insider activity: 3 sells totaling $2.3M — this cluster nearly doubles that volume in a single day.
Financial Impact
Total insider selling of $2.33M, representing ~0.1% of market cap. No direct financial impact to the company.
Risk Factors
- Insiders may be reacting to non-public negative information (e.g., a pending offering, weak Q2 pre-announcement, or customer loss).
- The stock has a 93% bullish analyst consensus — a contrarian insider sell cluster could trigger a sharp re-rating if negative news follows.
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-1779838339705 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 9, 2026 17d ago | S-3ASR | $8.87 | awaiting T+60 | — | $8.61 (−2.87%) |
Sep 25, 2026 4w ago | 8-K | $9.60 | awaiting T+60 | — | $8.61 (−10.26%) |
Aug 25, 2026 8w ago | Insider Cluster | $10.20 | awaiting T+60 | — | $8.61 (−15.54%) |
Aug 13, 2026 10w ago | 8-K | $12.51 | awaiting T+60 | — | $8.61 (−31.14%) |
Aug 1, 2026 12w ago | Institutional Cluster | $10.12 | awaiting T+60 | — | $8.61 (+14.87%) |
Jun 11, 2026 19w ago | Insider Cluster | $16.31 $10.39 | ▼ −36.30% | ▼ −39.56% | $8.61 (−47.18%) |
Jun 11, 2026 19w ago | Institutional Cluster | $17.10 $9.89 | ▼ −42.16% | ▼ −46.56% | $8.61 (−49.62%) |
Jun 8, 2026 20w ago | 144 | $4.84 | awaiting T+60 | — | $8.61 (−78.00%) |
May 28, 2026 21w ago | 144 | — | awaiting T+60 | — | — |
May 28, 2026 21w ago | Insider Cluster | $20.28 $9.86 | ▲ +51.38% | ▲ +52.56% | $8.61 (+57.52%) |
US Market Status
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