The unanimous buying by active managers suggests a shared positive thesis on ATI, but the 45-day reporting lag means these positions may already be unwound. Monitor upcoming 13F filings for Q4 to see if the cluster persists or reverses, and watch for insider buying as a corroborating signal.
Executive Summary
Six institutional investors accumulated $44.9M in ATI during Q3 2026, with no sellers detected. The cluster is dominated by active asset managers, including Assenagon Asset Management ($29.2M addition) and Robeco Institutional Asset Management ($8.5M addition), both doubling their positions.
Key Financial Metrics
Institutional Positions
Net institutional flow: $44.9M
▲ Buyers (6)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | ADD | +27.5% | $158.7M | $29.2M |
| Robeco Institutional Asset Management B.v. | DOUBLED | +528.4% | $10.2M | $8.5M |
| Concurrent Investment Advisors | DOUBLED | +437.8% | $6.9M | $5.6M |
| Assetmark | DOUBLED | +2647.8% | $1.1M | $1.0M |
| Vontobel Holding | ADD | +65.8% | $848.0K | $316.0K |
| Davenport & Co | ADD | +41.7% | $887.0K | $236.0K |
Key Facts
- 6 institutional buyers added $44.9M in net new value, with 0 sellers
- Assenagon Asset Management added $29.2M (largest dollar increase), raising stake to $158.7M
- Robeco Institutional Asset Management doubled its position (+528.4%), adding $8.5M
- Concurrent Investment Advisors nearly quintupled its position (+437.8%), adding $5.6M
- All buyers are active asset managers, not passive/index funds, strengthening the signal
Financial Impact
6 institutions accumulated $44.9M in new ATI positions during Q3 2026, with total disclosed holdings reaching $178.7M. No institutional selling was reported.
Risk Factors
- 13F data is 45+ days stale; positions may have been sold since quarter-end
- No insider buying or other catalysts confirmed in the filing data
- Small position sizes from most buyers (except Assenagon) limit conviction signal
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-ATI-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 27, 2026 today | SC 13G/A | $165.60 | awaiting T+5 | awaiting T+5 | No price |
Oct 21, 2026 6d ago | Institutional Cluster | $161.84 | awaiting T+5 | awaiting T+5 | No price |
Sep 10, 2026 6w ago | Insider Cluster | $198.77 $191.63 | ▼ −3.59% | ▼ −3.25% | No price |
Sep 4, 2026 7w ago | Insider Cluster | $207.32 $186.69 | ▼ −9.95% | ▼ −8.83% | No price |
Aug 26, 2026 8w ago | Insider Cluster | $212.86 $201.69 | ▼ −5.25% | ▼ −5.13% | No price |
Aug 6, 2026 11w ago | 8-K | $223.43 $227.22 | ▲ +1.70% | ▲ +0.48% | No price |
Aug 3, 2026 12w ago | Institutional Cluster | $193.12 $228.19 | ▲ +18.16% | ▲ +16.13% | No price |
Jul 22, 2026 13w ago | Institutional Cluster | $199.84 $181.90 | ▼ −8.98% | ▼ −9.45% | No price |
Jun 3, 2026 20w ago | 8-K | $181.10 $199.50 | ▲ +10.16% | ▲ +12.71% | No price |
Jun 3, 2026 20w ago | 8-K | $179.94 $183.37 | ▲ +1.91% | ▲ +5.73% | No price |
US Market Status
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