Vanguard's passive 5%+ stake is routine for a large index fund manager and does not signal activist intent. Monitor for any subsequent 13D conversion or additional accumulation by Vanguard or other institutional holders, though none is expected given the passive certification.
Price Chart
Executive Summary
Vanguard Capital Management LLC disclosed a 5.02% passive stake in Alto Neuroscience via a new Schedule 13G filing, reporting beneficial ownership of 1,970,108 common shares as of September 30, 2026. This is a new 13G filing for Vanguard, which was not listed as a filer in prior passive stake filings by other investors. The filing certifies passive intent and is consistent with Vanguard's typical index fund and managed account strategies.
Key Financial Metrics
Key Facts
- Vanguard Capital Management LLC filed a new Schedule 13G disclosing a 5.02% stake in Alto Neuroscience Inc.
- Beneficial ownership: 1,970,108 shares of common stock as of September 30, 2026.
- The filing certifies passive intent under Rule 13d-1(b) with no purpose of changing or influencing control.
- Vanguard was not a filer in prior SC 13G/A filings for Alto Neuroscience (Perceptive Advisors, Sirenia Capital, EcoR1 Capital).
- The stake is held across Vanguard affiliates including Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC, and Vanguard Investments Australia Ltd.
Financial Impact
5.02% stake valued at approximately $46M based on $916M market cap at analysis time.
Risk Factors
- No material risks identified from this passive stake filing.
- Vanguard's stake is below the 10% threshold that would typically warrant closer scrutiny.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G Filing (Primary) | 0002100119-26-001537 |
| Document: 0002100119-26-001537-index.html | 0002100119-26-001537 |
| Document: 0002100119-26-001537.txt | 0002100119-26-001537 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 30, 2026 2d ago | SC 13G | $23.00 | awaiting T+5 | awaiting T+5 | $22.60 (−1.74%) |
Aug 12, 2026 11w ago | Institutional Cluster | $32.30 $34.25 | ▲ +6.04% | ▲ +8.00% | $22.60 (−30.03%) |
Jul 14, 2026 15w ago | 8-K | $27.80 $25.90 | ▲ +6.83% | ▲ +5.54% | $22.60 (+18.71%) |
Jul 14, 2026 15w ago | 424B5 | $27.80 $25.90 | ▲ +6.83% | ▲ +5.54% | $22.60 (+18.71%) |
Jul 13, 2026 15w ago | 8-K | $28.03 $27.54 | ▼ −1.75% | ▼ −0.96% | $22.60 (−19.37%) |
Jun 11, 2026 20w ago | Institutional Cluster | $21.47 $22.74 | ▲ +5.92% | ▲ +5.24% | $22.60 (+5.26%) |
May 29, 2026 22w ago | 3 | $19.80 $18.26 | ▼ −7.78% | ▼ −5.03% | $22.60 (+14.14%) |
May 28, 2026 22w ago | 8-K | $20.22 $18.85 | ▼ −6.78% | ▼ −6.73% | $22.60 (+11.77%) |
May 13, 2026 24w ago | 8-K | $22.85 $20.45 | ▼ −10.50% | ▼ −9.35% | $22.60 (−1.09%) |
Apr 21, 2026 27w ago | EFFECT | $25.59 $24.47 | ▼ −4.38% | ▼ −5.46% | $22.60 (−11.68%) |
US Market Status
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