The unanimous buying by active managers suggests a shared catalyst thesis, likely Amphenol's exposure to defense/aerospace, data center connectivity, or automotive electrification. Monitor upcoming earnings for revenue growth confirmation and any guidance revisions that could validate the cluster's conviction.
Executive Summary
A cluster of 11 institutional investors accumulated positions in Amphenol Corp during Q3 2026, with net buying of $424.0M in current holdings. The cluster is entirely composed of active asset managers, with no sellers, indicating a strong shared bullish thesis on the company's fundamentals or sector positioning. The 45-day reporting lag means these positions may have been adjusted since quarter-end.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$38.8M
▲ Buyers (11)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Congress Asset Management | ADD | +75.9% | $181.0M | -$34.2M |
| Fjarde Ap-Fonden /Fourth Swedish National | ADD | +85.1% | $104.8M | -$13.6M |
| Banque Pictet & Cie | NEW | +100% | $29.7M | $29.7M |
| Robeco Institutional Asset Management B.v. | ADD | +37.6% | $29.4M | -$15.3M |
| Assenagon Asset Management | ADD | +76.4% | $16.9M | -$3.1M |
Key Facts
- 11 institutional buyers, 0 sellers in Q3 2026
- Aggregate current holdings of $424.0M across all buyers
- Net dollar change of -$38.8M due to share price decline, not selling
- Congress Asset Management added 75.9% to become the largest holder in the cluster at $181.0M
- Banque Pictet & Cie initiated a new position worth $29.7M
- Fjarde Ap-Fonden (Fourth Swedish National Pension Fund) added 85.1% to $104.8M
- All buyers are active asset managers, no passive/index funds in the cluster
Financial Impact
11 institutions accumulated positions totaling $424.0M in current value, with net buying of approximately $38.8M (net of price decline). No institutional selling occurred.
Risk Factors
- 13F data is 45+ days stale; positions may have been reduced or exited since quarter-end
- The cluster's net dollar change is negative (-$38.8M) due to share price decline, indicating the buying occurred at higher prices
- No insider buying corroboration is present in this cluster data
- Concentrated buying in a single quarter could reflect a one-time rebalancing rather than a sustained thesis
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-APH-2026-Q3 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 28, 2026 today | 8-K | $80.11 | awaiting T+1 | awaiting T+1 | No price |
Oct 28, 2026 today | Press Release | $83.15 | awaiting T+1 | awaiting T+1 | No price |
Oct 22, 2026 5d ago | Institutional Cluster | $74.09 $75.27 | ▲ +1.59% | ▲ +0.88% | No price |
Oct 6, 2026 21d ago | 8-K | $87.55 $85.32 | ▼ −2.55% | ▼ −2.12% | No price |
Sep 4, 2026 7w ago | 8-K | $81.76 $81.34 | ▼ −0.51% | ▼ −0.05% | No price |
Aug 6, 2026 11w ago | 8-K | $84.59 $83.85 | ▼ −0.87% | ▼ −0.85% | No price |
Aug 5, 2026 11w ago | Insider Cluster | $170.61 $169.18 | ▼ −0.84% | ▼ −1.45% | No price |
Aug 5, 2026 11w ago | Insider Cluster | $170.61 $169.18 | ▼ −0.84% | ▼ −1.45% | No price |
Aug 5, 2026 11w ago | Insider Cluster | $170.61 $169.18 | ▼ −0.84% | ▼ −1.45% | No price |
Jul 25, 2026 13w ago | Institutional Cluster | $149.28 $143.85 | ▼ −3.64% | ▼ −3.88% | No price |
US Market Status
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