The CEO's massive sale is a bearish signal, but the exercise-and-sell pattern suggests a pre-arranged plan rather than opportunistic selling. Monitor for any 10b5-1 plan disclosure or subsequent filings that clarify intent. The stock's recent run-up (trading ~$165 vs. $26.66 exercise price) may have triggered a planned liquidity event.
Price Chart
Executive Summary
CEO Emily Leproust executed a massive derivative exercise and open-market sale of ~$55M in TWST stock on September 17, 2026, followed by a smaller $279K sale on September 21. The SVP of HR also sold $49K. The CEO's sales are overwhelmingly the dominant signal, but the sheer size and pattern suggest a planned exercise-and-sell program, not opportunistic selling. The cluster is notable for its dollar magnitude but likely reflects a pre-arranged 10b5-1 plan or tax-related disposition.
Key Financial Metrics
Key Facts
- CEO Leproust sold ~$55M in open-market sales on Sep 17, 2026, alongside derivative exercises at $26.66 and $8.82 strike prices.
- CEO sold an additional $279K on Sep 21 at $165.49/share.
- SVP of HR Green sold $49K on Sep 21.
- Total cluster open-market sales: ~$55.3M, with $55M from the CEO alone.
- The CEO's sales represent a significant portion of her holdings and are large in absolute dollar terms.
- No 10b5-1 plan is explicitly mentioned in the filing data, but the pattern of exercise-and-sell is consistent with a planned liquidity event.
Financial Impact
CEO sold ~$55M in open-market sales, representing a material portion of her stake. The Sep 17 sales alone were ~$55M, with an additional $279K on Sep 21.
Risk Factors
- CEO selling a large portion of her stake could signal lack of confidence in near-term prospects.
- The derivative exercises add shares to the market, increasing dilution.
- No explicit 10b5-1 plan disclosed, leaving open the possibility of opportunistic selling.
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-TWST-1790231193420 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 13, 2026 13d ago | Insider Cluster | $148.16 | awaiting T+20 | — | $145.25 (+1.96%) |
Oct 9, 2026 17d ago | 144 | $159.78 | awaiting T+20 | — | $145.25 (−9.09%) |
Oct 5, 2026 21d ago | Insider Cluster | $166.97 | awaiting T+20 | — | $145.25 (+13.01%) |
Sep 25, 2026 4w ago | Insider Cluster | $179.60 $145.25 | ▼ −19.13% | ▼ −19.09% | $145.25 (−19.13%) |
Sep 23, 2026 4w ago | Insider Cluster | $184.03 $135.47 | ▲ +26.39% | ▲ +25.97% | $145.25 (+21.07%) |
Sep 10, 2026 6w ago | Insider Cluster | $127.22 $159.78 | ▲ +25.59% | ▲ +23.73% | $145.25 (+14.17%) |
Aug 27, 2026 8w ago | Insider Cluster | $141.38 $179.60 | ▲ +27.03% | ▲ +27.52% | $145.25 (+2.74%) |
Aug 25, 2026 8w ago | Insider Cluster | $150.06 $184.03 | ▲ +22.64% | ▲ +22.49% | $145.25 (−3.21%) |
Aug 21, 2026 9w ago | Insider Cluster | $140.80 $164.60 | ▲ +16.90% | ▲ +15.61% | $145.25 (+3.16%) |
Aug 20, 2026 9w ago | Insider Cluster | $145.59 $165.83 | ▲ +13.90% | ▲ +12.89% | $145.25 (−0.23%) |
US Market Status
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