Vanguard's increased passive stake to 7.04% is routine index-fund portfolio rebalancing. No activist intent is signaled. Monitor for any future conversion to a 13D filing, which would indicate a shift in strategy.
Price Chart
Executive Summary
Vanguard Portfolio Management LLC filed an amended Schedule 13G disclosing a 7.04% passive stake in Ambarella Inc as of September 30, 2026, up from a prior filing. The filing confirms the stake remains passive under Rule 13d-1(b) with no activist intent.
Key Financial Metrics
Key Facts
- Vanguard Portfolio Management LLC reported beneficial ownership of 3,107,820 shares of Ambarella Inc common stock as of September 30, 2026.
- The stake represents 7.04% of shares outstanding.
- The filing is an amendment (SC 13G/A) to a prior passive stake disclosure.
- The filer certifies the securities were acquired and held in the ordinary course of business, not for changing or influencing control of the issuer.
- Vanguard Portfolio Management LLC is an investment adviser (IA) and includes holdings from Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC.
Financial Impact
Vanguard's disclosed stake of 3,107,820 shares at a market cap of $2.9B implies a position value of approximately $204M (based on market cap and share count).
Risk Factors
- No material risks identified; this is a routine passive stake amendment.
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) | 0002100121-26-001058 |
| Document: 0002100121-26-001058-index.html | 0002100121-26-001058 |
| Document: 0002100121-26-001058.txt | 0002100121-26-001058 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 30, 2026 2d ago | SC 13G/A | $59.61 | awaiting T+20 | awaiting T+20 | $63.12 (+5.89%) |
Sep 28, 2026 4w ago | Insider Cluster | $68.73 $67.12 | ▼ −2.34% | ▼ −3.06% | $63.12 (−8.16%) |
Sep 25, 2026 5w ago | 144 | $72.68 $66.50 | ▼ −8.50% | ▼ −7.03% | $63.12 (−13.15%) |
Sep 21, 2026 5w ago | Insider Cluster | $67.06 $63.22 | ▲ +5.73% | ▲ +5.17% | $63.12 (+5.88%) |
Sep 18, 2026 6w ago | Insider Cluster | $68.85 $62.76 | ▲ +8.85% | ▲ +7.94% | $63.12 (+8.32%) |
Aug 11, 2026 11w ago | Press Release | $83.53 | awaiting T+20 | awaiting T+20 | $63.12 (−24.43%) |
Jul 2, 2026 17w ago | Insider Cluster | $79.73 $82.68 | ▲ +3.70% | ▲ +2.85% | $63.12 (−20.83%) |
May 28, 2026 22w ago | Insider Cluster | $72.18 $67.01 | ▼ −7.16% | ▼ −5.37% | $63.12 (−12.55%) |
May 28, 2026 22w ago | 8-K | $72.18 $67.01 | ▼ −7.16% | ▼ −5.37% | $63.12 (−12.55%) |
May 15, 2026 24w ago | DEFA14A | $78.88 $67.12 | ▼ −14.91% | ▼ −16.49% | $63.12 (−19.98%) |
US Market Status
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