The increase from below 5% to nearly 9% is notable in size but routine for a passive index manager. Monitor for any subsequent 13D filing if Vanguard's intent changes, but no activist conversion is indicated here.
Price Chart
Executive Summary
Vanguard Portfolio Management LLC filed an amended Schedule 13G disclosing a 8.80% passive stake in Five9, Inc. as of September 30, 2026, up from 4.93% in the prior filing. The increase reflects routine portfolio rebalancing by a large passive index fund manager and does not signal any change in investment intent or activist posture.
Key Financial Metrics
Key Facts
- Vanguard Portfolio Management LLC disclosed beneficial ownership of 6,579,962 shares of Five9, Inc. common stock as of September 30, 2026.
- The stake represents 8.80% of shares outstanding, an increase from the prior 4.93% stake reported in the August 2026 filing.
- The filing certifies passive intent under Rule 13d-1(b), the shares were acquired and are held in the ordinary course of business, not to influence control.
- Vanguard is a large passive index fund manager; the increase is consistent with normal portfolio rebalancing and index fund inflows.
Financial Impact
Stake increased from ~4.93% to 8.80% of shares outstanding; no transaction prices disclosed.
Risk Factors
- A large passive holder accumulating a 9% stake could become a swing factor in any future proxy vote or M&A scenario.
- No indication of activist intent, but the stake size gives Vanguard meaningful influence if they choose to engage.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G/A Filing (Primary) | 0002100121-26-001060 |
| Document: 0002100121-26-001060-index.html | 0002100121-26-001060 |
| Document: 0002100121-26-001060.txt | 0002100121-26-001060 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 30, 2026 2d ago | SC 13G/A | $35.65 | awaiting T+20 | awaiting T+20 | $36.34 (+1.94%) |
Oct 30, 2026 2d ago | SC 13G/A | $36.18 | awaiting T+20 | awaiting T+20 | $36.34 (+0.46%) |
Oct 21, 2026 11d ago | Institutional Cluster | $35.10 | awaiting T+20 | awaiting T+20 | $36.34 (+3.53%) |
Oct 16, 2026 16d ago | SC 13G/A | $32.23 | awaiting T+20 | awaiting T+20 | $36.34 (+12.75%) |
Sep 9, 2026 7w ago | Insider Cluster | $30.25 $35.15 | ▲ +16.20% | ▲ +13.82% | $36.34 (+20.13%) |
Sep 9, 2026 7w ago | Insider Cluster | $30.25 $35.15 | ▲ +16.20% | ▲ +14.07% | $36.34 (+20.13%) |
Sep 8, 2026 7w ago | Insider Cluster | $30.37 $33.78 | ▼ −11.23% | ▼ −9.28% | $36.34 (−19.66%) |
Aug 21, 2026 10w ago | Institutional Cluster | $32.75 $37.01 | ▲ +13.01% | ▲ +13.53% | $36.34 (+10.96%) |
Jun 22, 2026 18w ago | 8-K | $19.06 $25.70 | ▲ +34.84% | ▲ +33.68% | $36.34 (+90.66%) |
Jun 8, 2026 20w ago | Insider Cluster | $21.68 $24.99 | ▲ +15.24% | ▲ +13.80% | $36.34 (+67.62%) |
US Market Status
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