VSTM Verastem, Inc.
Executive Summary
Three mega-passive institutional investors (BlackRock, Fidelity, Morgan Stanley) collectively added $32.7M to their VSTM positions in Q3 2025, increasing holdings by 34-73%. The buying is entirely from passive/index funds, likely reflecting index rebalancing rather than an active fundamental thesis. Historical calibration shows this filing type has negative average alpha at T+20 (-2.10%), and past VSTM reports have underperformed significantly (-12.56% avg T+20).
Key Financial Metrics
Institutional Positions
Net institutional flow: $32.7M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| BlackRock | ADD | +34.7% | $32.8M | $21.4M |
| Fidelity | ADD | +72.5% | $2.8M | $2.1M |
| Morgan Stanley | ADD | +41.1% | $13.9M | $9.3M |
Actionable Insight
The cluster is entirely passive/index-driven, likely reflecting VSTM's inclusion or rebalancing in broad market indices. No active fundamental thesis is signaled. Given the poor historical performance of VSTM reports (-12.56% avg T+20) and the negative calibration alpha for this filing type, treat this as noise. Monitor for any active manager 13F filings in subsequent quarters for a genuine signal.
Key Facts
- 3 passive institutions added $32.7M net to VSTM in Q3 2025
- BlackRock increased position by 34.7% (now $32.8M), Fidelity +72.5% ($2.8M), Morgan Stanley +41.1% ($13.9M)
- No institutional sellers detected in the cluster
- All buyers are mega-passive/index funds — no active managers or hedge funds involved
- Historical VSTM reports show -12.56% average T+20 return with 0% win rate
Financial Impact
3 passive institutions accumulated $32.7M in new VSTM positions during Q3 2025, with total holdings reaching $49.6M
Risk Factors
- Passive buying provides no fundamental catalyst — the cluster may already be unwound given the 45-day 13F lag
- VSTM has a history of significant negative returns following prior reports (-12.56% avg T+20)
- No active manager participation suggests the buying is mechanical, not thesis-driven
Market Snapshot
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-VSTM-2025-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
|
Jun 11, 2026
1d ago
|
Institutional Cluster
| $3.94 awaiting T+5 | awaiting T+5 | — | — |
|
Jun 11, 2026
2d ago
|
Institutional Cluster
| $3.76 awaiting T+5 | awaiting T+5 | — | — |
|
May 27, 2026
16d ago
|
3
| $4.29 $3.86 | ▼ −10.02% | ▼ −10.34% | — |
|
May 27, 2026
16d ago
|
144
| $4.29 $3.62 | ▼ −15.62% | ▼ −15.57% | — |
|
Mar 4, 2026
14w ago
|
8-K
| $6.15 $5.84 | ▼ −5.04% | ▼ −2.80% | — |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Try SecBot Free Coming soon: SecBot Pro with alerts, watchlists, and API access