The selling is not economically massive relative to TWST's $4B cap, but the breadth (6 officers + 1 director) and timing (concentrated around a likely corporate catalyst window) are notable. Per the calibration model, cluster insider trades at this company act as an amplifier when paired with earnings, press, offering, or agreement context — suggesting an upcoming material disclosure. Monitor for an 8-K, offering filing, or earnings release in the next 2-4 weeks. A blackout-window opening is the most benign explanation, but the actuarial pattern favors caution.
Price Chart
Executive Summary
A substantial insider selling cluster at Twist Bioscience, concentrated on May 21-26, 2026, with CEO Emily Leproust alone selling ~$3.1M in open-market shares after exercising options. The cluster spans the C-suite (CEO, COO, CFO, Chief Accounting Officer), SVP of HR, and a director. Total open-market sales exceed $3.9M, representing approximately 0.1% of the $4.0B market cap, placing it at the modest-to-notable boundary. The pattern suggests a coordinated response to a single event — likely a planned post-blackout or 10b5-1 window opening following earnings, a press release, or an offering — consistent with the cross-filing amplifications flagged by the actuarial model. While the cluster is broad, the proportionality check to market cap caps the directional read as modest; the strong historical win rate (71% at T+20) and actuarial amplifier for insider-trade clusters at this company support a moderately negative read.
Key Financial Metrics
Key Facts
- CEO Emily Leproust sold 48,034 open-market shares across May 26-27, realizing ~$3.13M in proceeds
- CEO also exercised 74,316 stock options (non-cash and $8.82 strike) over the same period
- Four other C-suite officers (COO, CFO, Chief Accounting Officer, SVP HR) sold shares on May 21, totaling $443K
- A director (Starovasnik) sold $30.5K on May 26 — not in a 10b5-1 pattern
- Total open-market sales in this cluster: ~$3.95M, roughly 0.1% of TWST's $4.0B market cap
- All C-suite sales occurred at prices near $53 (May 21) and $65 (May 26-27), with later sales at higher prices
- No open-market purchases occurred in the cluster — the net direction is unequivocally selling
Financial Impact
Total insider selling of ~$3.95M in open-market sales over one week, representing ~0.1% of market cap
Risk Factors
- Insider cluster selling may indicate upcoming negative news or earnings miss that is not yet public
- CEO sold near $65, near all-time or recent highs for the stock, potentially signaling a belief that shares are fully valued
- Option exercises by CEO created shares that were immediately sold, increasing public float modestly (~74k shares) and increasing tax-related selling pressure
- The lack of any insider buying alongside this cluster confirms uniform bearish positioning among the C-suite
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-TWST-1779998804422 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 10, 2026 22d ago | Insider Cluster | $127.22 $166.99 | ▲ +31.26% | ▲ +31.60% | $188.67 (+48.30%) |
Aug 27, 2026 5w ago | Insider Cluster | $153.10 $128.71 | ▼ −15.93% | ▼ −16.20% | $188.67 (+23.23%) |
Aug 25, 2026 5w ago | Insider Cluster | $151.42 $132.06 | ▼ −12.79% | ▼ −12.25% | $188.67 (+24.60%) |
Aug 21, 2026 6w ago | Insider Cluster | $145.59 $141.38 | ▼ −2.89% | ▼ −3.37% | $188.67 (+29.59%) |
Aug 20, 2026 6w ago | Insider Cluster | $136.23 $153.10 | ▲ +12.38% | ▲ +11.27% | $188.67 (+38.49%) |
Aug 14, 2026 7w ago | Insider Cluster | $124.41 $140.80 | ▲ +13.17% | ▲ +14.36% | $188.67 (+51.65%) |
Aug 14, 2026 7w ago | Insider Cluster | $124.41 $140.80 | ▼ −13.17% | ▼ −14.36% | $188.67 (−51.65%) |
Aug 12, 2026 7w ago | Insider Cluster | $125.29 $136.23 | ▲ +8.73% | ▲ +10.70% | $188.67 (+50.59%) |
Aug 12, 2026 7w ago | 144 | $125.29 $136.23 | ▲ +8.73% | ▲ +10.70% | $188.67 (+50.59%) |
Aug 11, 2026 7w ago | Insider Cluster | $123.12 $116.10 | ▼ −5.70% | ▼ −5.30% | $188.67 (+53.24%) |
US Market Status
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