The cluster is small and dominated by a single new position from Congress Asset Management. Without insider buying or additional institutional sellers to create a clear directional signal, the filing suggests mild institutional interest but no urgent catalyst. Monitor next quarter's 13F for follow-through or exits.
Executive Summary
Three institutional asset managers increased their MTRN holdings in Q3 2026, led by a new $51.8M position from Congress Asset Management and a $2.4M add from Proshare Advisors. The cluster is small in scale relative to MTRN's $4.9B market cap and lacks insider buying corroboration, limiting its signal strength.
Key Financial Metrics
Institutional Positions
Net institutional flow: $54.2M
▲ Buyers (3)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Congress Asset Management | NEW | +100% | $51.8M | $51.8M |
| Proshare Advisors | ADD | +40% | $11.4M | $2.4M |
Key Facts
- Congress Asset Management initiated a new $51.8M position in MTRN during Q3 2026.
- Proshare Advisors added $2.4M, increasing its stake by 40.0%.
- Assetmark added a trivial $875 position (22 shares).
- No institutional sellers were identified in the cluster.
- The 13F × Form 4 confluence score is 3/100 (divergent), with zero open-market insider buyers.
- Total institutional buying in the cluster was $54.2M, representing about 1.1% of MTRN's market cap.
Financial Impact
Three asset managers accumulated $54.2M in net new MTRN holdings during Q3 2026, with Congress Asset Management accounting for $51.8M of the total.
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end.
- No insider buying corroboration weakens the conviction signal.
- The cluster is small in dollar terms relative to MTRN's $4.9B market cap.
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-MTRN-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 29, 2026 3d ago | Institutional Cluster | $239.81 | awaiting T+60 | awaiting T+60 | No price |
Oct 12, 2026 20d ago | Institutional Cluster | $270.15 | awaiting T+60 | awaiting T+60 | No price |
Sep 3, 2026 8w ago | Insider Cluster | $240.56 | awaiting T+60 | awaiting T+60 | No price |
Sep 3, 2026 8w ago | Insider Cluster | $240.56 | awaiting T+60 | awaiting T+60 | No price |
Sep 1, 2026 8w ago | 144 | $234.19 | awaiting T+60 | awaiting T+60 | No price |
Aug 11, 2026 11w ago | Insider Cluster | $283.26 | awaiting T+60 | awaiting T+60 | No price |
Aug 11, 2026 11w ago | Insider Cluster | $283.26 | awaiting T+60 | awaiting T+60 | No price |
Aug 5, 2026 12w ago | 8-K | $297.08 $240.68 | ▼ −18.98% | ▼ −19.18% | No price |
Jun 14, 2026 20w ago | Institutional Cluster | $252.14 $253.07 | ▲ +0.37% | ▼ −0.63% | No price |
May 15, 2026 24w ago | Insider Cluster | $205.02 $280.80 | ▲ +36.96% | ▲ +32.45% | No price |
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