The large block sale by Summit Partners is a strong bearish signal, suggesting a key insider is reducing exposure. Monitor for further sales from Summit or other insiders; the stock could face continued pressure from overhang. The C-suite tax-withholdings are routine but the CFO's open-market sale adds to the negative read.
Price Chart
Executive Summary
A significant insider selling cluster at Klaviyo, driven by a $88.55M open-market sale by 10% owner Summit Partners and a $259K sale by the CFO, alongside tax-withholding share surrenders by four C-suite executives. The Summit Partners sale represents ~1.8% of market cap, a highly material reduction by a key investor, while the tax-withholding events are routine and non-directional. The cluster signals potential overhang and reduced insider confidence, but the selling is concentrated in one large block holder rather than broad C-suite distribution.
Key Financial Metrics
Key Facts
- Summit Partners L.P., a 10% owner, sold 5.00M shares for $88.55M in an open-market sale on August 11, 2026.
- CFO Amanda Whalen sold 14,000 shares for $259K in an open-market sale on August 14, 2026.
- Four C-suite executives (Co-CEO, Chief People Officer, Chief Legal Officer, CFO) had tax-withholding share surrenders totaling $2.05M, which are non-cash events.
- The Summit Partners sale amounts to approximately 1.77% of Klaviyo's $5.0B market cap.
- Recent insider activity (30d) prior to this cluster totaled $88.8M in sells, now extended by this cluster.
Financial Impact
Summit Partners sold $88.55M of stock, representing ~1.77% of market cap. CFO sale added $259K. Total open-market selling value: $88.81M.
Risk Factors
- Continued selling by Summit Partners or other large holders could create sustained downward pressure.
- The selling cluster may spook retail and institutional investors, accelerating price decline.
- No recent positive company-specific catalysts (e.g., earnings beat, guidance raise) are available to counterbalance the insider selling signal.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-KVYO-1787121129519 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 7, 2026 18d ago | 144 | $17.57 | awaiting T+20 | — | $20.61 (+17.30%) |
Sep 11, 2026 6w ago | 144 | $16.36 $17.32 | ▲ +5.87% | ▲ +4.00% | $20.61 (+25.98%) |
Sep 1, 2026 7w ago | Insider Cluster | $19.31 $15.73 | ▼ −18.54% | ▼ −18.21% | $20.61 (+6.73%) |
Aug 18, 2026 9w ago | Insider Cluster | $18.20 $15.87 | ▲ +12.80% | ▲ +10.85% | $20.61 (−13.24%) |
Aug 18, 2026 9w ago | Insider Cluster | $18.20 $15.87 | ▲ +12.80% | ▲ +10.85% | $20.61 (−13.24%) |
Aug 11, 2026 10w ago | 144 | $17.25 $16.13 | ▲ +6.49% | ▲ +4.59% | $20.61 (−19.48%) |
May 20, 2026 22w ago | Insider Cluster | $14.91 $12.82 | ▼ −14.02% | ▼ −14.35% | $20.61 (+38.23%) |
May 18, 2026 22w ago | Insider Cluster | $14.70 $13.46 | ▼ −8.44% | ▼ −9.42% | $20.61 (+40.20%) |
May 18, 2026 23w ago | 144 | $14.61 $13.84 | ▼ −5.27% | ▼ −6.85% | $20.61 (+41.07%) |
Apr 29, 2026 25w ago | DEFA14A | $20.09 $15.84 | ▼ −21.15% | ▼ −26.38% | $20.61 (+2.59%) |
US Market Status
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