The cluster is dominated by a single massive Assenagon build, which may reflect a concentrated thesis rather than broad conviction. Monitor upcoming MU earnings and guidance for confirmation of the catalyst that drove Q3 buying. The 45-day reporting lag means this position may already be partially unwound.
Executive Summary
Five institutional buyers accumulated $2.99B in net new MU positions during Q3 2026, led by Assenagon Asset Management nearly tripling its stake to $2.99B. One seller exited $71.3M.
Key Financial Metrics
Institutional Positions
Net institutional flow: $2.9B
▲ Buyers (5)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Congress Asset Management | ADD | +99% | $126.2M | $57.4M |
| Mather Group | ADD | +47.5% | $14.0M | $3.7M |
| Assenagon Asset Management | DOUBLED | +1528.1% | $3.0B | $2.8B |
| Ninety One Uk | DOUBLED | +15818.9% | $72.6M | $72.1M |
| Td Waterhouse Canada | ADD | +39.3% | $195.0M | $63.4M |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Artemis Investment Management | NEAR_EXIT | -93% | $76.3M | -$71.3M |
Key Facts
- 5 institutional buyers added $2.99B in net new MU holdings in Q3 2026
- Assenagon Asset Management DOUBLED its position by +1,528% to $2.99B, accounting for ~93% of total buying
- 1 seller (Artemis Investment Management) reduced by -93% for -$71.3M
- Total buyer current holdings: $3.40B; total seller exit: $71.3M
- All participants are active asset managers — no passive/index funds in the cluster
Financial Impact
5 institutions accumulated $2.99B in new MU positions while 1 reduced holdings by $71.3M, for net institutional inflow of ~$2.92B
Risk Factors
- 13F data is 45+ days stale; the cluster may have been partially or fully unwound since quarter-end
- Single-fund dominance (Assenagon = 93% of buying) reduces diversification of the signal
- No insider buying corroboration provided — institutional-only signal is weaker
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-MU-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 20, 2026 6d ago | Insider Cluster | $913.67 | awaiting T+60 | — | — |
Oct 19, 2026 7d ago | Press Release | $904.90 | awaiting T+60 | — | — |
Oct 16, 2026 10d ago | Institutional Cluster | $904.90 | awaiting T+60 | — | — |
Oct 12, 2026 14d ago | Institutional Cluster | $988.88 | awaiting T+60 | — | — |
Sep 30, 2026 26d ago | Press Release | $1,097.39 | awaiting T+60 | — | — |
Sep 2, 2026 7w ago | Court Ruling | $955.73 | awaiting T+60 | — | — |
Aug 28, 2026 8w ago | Insider Cluster | $958.73 | awaiting T+60 | — | — |
Aug 26, 2026 8w ago | 8-K | $938.40 | awaiting T+60 | — | — |
Aug 25, 2026 8w ago | Insider Cluster | $938.40 | awaiting T+60 | — | — |
Aug 14, 2026 10w ago | ANALYST-UPGRADE | $971.66 | awaiting T+60 | — | — |
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.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers