The cluster is entirely passive/index-driven (Vanguard, BlackRock, Morgan Stanley), likely reflecting index rebalancing or ETF inflows rather than a fundamental thesis. With MAZE's historical T+20 performance deeply negative and zero prior winning calls, this passive accumulation does not signal near-term upside. Monitor for active manager 13F filings or insider buying for a more reliable signal.
Executive Summary
Three mega-passive institutional investors (Vanguard, BlackRock, Morgan Stanley) collectively doubled their positions in Maze Therapeutics during Q3 2025, adding $61.2M in new holdings to reach $74.3M total. This is a passive index-driven accumulation signal, not an active fundamental thesis, and follows a period of poor historical stock performance with zero winning calls at T+20.
Key Financial Metrics
Institutional Positions
Net institutional flow: $61.2M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Vanguard | DOUBLED | +218.1% | $34.6M | $29.5M |
| BlackRock | DOUBLED | +114.1% | $34.1M | $26.6M |
| Morgan Stanley | DOUBLED | +569.5% | $5.5M | $5.1M |
Key Facts
- 3 institutional buyers, 0 sellers in Q3 2025
- Aggregate net buying: $61.2M (from $13.0M to $74.3M)
- Vanguard doubled shares (+218.1%), BlackRock doubled (+114.1%), Morgan Stanley increased 569.5%
- All three buyers are mega-passive/index funds — not active managers
- Historical MAZE reports show 0% win rate at T+20 (n=6 settled), avg T+20 return -13.45%
Financial Impact
3 institutions accumulated $61.2M in new positions, bringing total disclosed holdings to $74.3M
Risk Factors
- Passive buying provides no fundamental validation — may be mechanically reversed in next rebalance
- Historical MAZE reports show consistent negative T+20 returns regardless of filing type
- No active manager participation suggests lack of conviction from informed capital
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-MAZE-2025-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 4, 2026 27d ago | Insider Cluster | $26.37 $24.23 | ▼ −8.12% | ▼ −7.00% | — |
Sep 4, 2026 27d ago | Insider Cluster | $26.37 $24.23 | ▼ −8.12% | ▼ −7.00% | — |
Sep 3, 2026 29d ago | Insider Cluster | $25.87 $24.60 | ▼ −4.91% | ▼ −3.76% | — |
Sep 2, 2026 29d ago | 144 | $25.87 $24.60 | ▼ −4.91% | ▼ −3.76% | — |
Sep 1, 2026 4w ago | 144 | $26.72 $24.82 | ▼ −7.11% | ▼ −6.15% | — |
Aug 17, 2026 6w ago | 3 | $29.13 $30.42 | ▲ +4.43% | ▲ +4.63% | — |
Aug 11, 2026 7w ago | Press Release | $27.53 $29.75 | ▲ +8.06% | ▲ +8.51% | — |
Aug 7, 2026 8w ago | Institutional Cluster | $28.65 $27.18 | ▼ −5.13% | ▼ −5.53% | — |
Aug 5, 2026 8w ago | Insider Cluster | $27.81 $27.53 | ▼ −1.01% | ▼ −1.36% | — |
Jul 2, 2026 13w ago | Insider Cluster | $31.26 $32.42 | ▲ +3.71% | ▲ +2.78% | — |
US Market Status
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