The broad-based institutional accumulation is a positive signal, but the 45-day reporting lag and lack of insider buying warrant caution. Monitor for any Q3 2026 13F updates or insider filings to confirm the thesis is still active. The stock's historical volatility (recent -12% days) suggests position sizing should be conservative.
Executive Summary
A strong institutional cluster of 9 buyers accumulated $186.9M in ALMS during Q2 2026, led by Fidelity doubling its position to $190.5M. The buying is broad-based across asset managers and a mega-passive fund, while only 2 small sellers trimmed. This signals a shared positive thesis on Alumis, though the 13F data is 45+ days stale and the stock has been volatile historically. No insider open-market buying corroborates the institutional conviction, which tempers the signal slightly.
Key Financial Metrics
Institutional Positions
Net institutional flow: $185.4M
▲ Buyers (9)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Fidelity | DOUBLED | +595.1% | $190.5M | $169.0M |
| Citigroup | DOUBLED | +289.6% | $10.8M | $8.7M |
| Morgan Stanley | ADD | +42.7% | $9.0M | $4.1M |
▼ Sellers (2)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Td Asset Management | TRIM | -49.3% | $4.2M | -$1.5M |
| Optiver Holding B.v. | TRIM | -58% | $5.0K | -$2.3K |
Key Facts
- 9 institutional buyers added $186.9M in net new positions during Q2 2026
- Fidelity doubled its stake from $21.5M to $190.5M (+595% shares)
- Citigroup doubled its position to $10.8M (+290% shares)
- Only 2 sellers trimmed a combined $1.48M, a negligible counterweight
- No insider open-market buying (confluence score 23/100, divergent) weakens the signal
Financial Impact
9 institutional buyers added $186.9M in net new positions; 2 sellers trimmed $1.48M. Net institutional inflow of ~$185.4M.
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound
- No insider open-market buying to corroborate institutional conviction
- Stock has shown high volatility with recent -12% single-day moves
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-ALMS-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 9, 2026 6w ago | Insider Buy | $9.90 $9.18 | ▼ −7.27% | ▼ −8.13% | — |
Sep 1, 2026 8w ago | 8-K | $9.47 $10.35 | ▲ +9.29% | ▲ +8.85% | — |
Aug 15, 2026 10w ago | Institutional Cluster | $25.50 $24.88 | ▼ −2.43% | ▼ −1.76% | — |
Aug 10, 2026 11w ago | 8-K | $25.37 $25.55 | ▲ +0.71% | ▲ +0.46% | — |
Aug 5, 2026 11w ago | Insider Cluster | $27.80 $27.60 | ▼ −0.72% | ▼ −1.33% | — |
Aug 5, 2026 11w ago | Insider Cluster | $27.80 $27.60 | ▼ −0.72% | ▼ −1.33% | — |
Jun 29, 2026 17w ago | 8-K | $27.14 $28.14 | ▲ +3.68% | ▲ +2.91% | — |
Jun 11, 2026 19w ago | Institutional Cluster | $20.90 $24.15 | ▲ +15.55% | ▲ +15.01% | — |
May 18, 2026 23w ago | DEFA14A | $21.53 $22.04 | ▲ +2.39% | ▲ +1.35% | — |
Mar 28, 2026 30w ago | Press Release | $20.21 $22.03 | ▲ +9.01% | ▲ +6.11% | — |
US Market Status
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