The mixed cluster with no insider buying suggests limited conviction — monitor for a follow-up 13F filing or insider purchases to confirm the bullish thesis. The Assenagon doubling is the strongest signal but may reflect passive rebalancing rather than active conviction. Given the 45-day 13F lag, these positions may already be unwound.
Executive Summary
A mixed institutional cluster in Arista Networks (ANET) for 2026-Q2 shows $299.8M in net buying from 4 asset managers, led by Assenagon Asset Management doubling its stake to $351.9M and Rathbones Group adding a new $53.4M position. However, 3 sellers trimmed $30.9M, including Congress Asset Management reducing by $12.9M and Mediolanum International Funds cutting $17.9M. The divergence between active buyers and sellers, combined with zero insider buying (Form 4 score 17/100), suggests the cluster reflects portfolio rebalancing rather than a strong shared catalyst, though the scale of Assenagon's doubling is notable.
Key Financial Metrics
Institutional Positions
Net institutional flow: $268.9M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | DOUBLED | +106.4% | $351.9M | $228.7M |
| Rathbones Group | DOUBLED | +4261.6% | $53.4M | $52.6M |
| Exchange Traded Concepts | ADD | +85.2% | $29.8M | $18.2M |
▼ Sellers (3)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Mediolanum International Funds | TRIM | -44.8% | $81.3M | -$17.9M |
| Congress Asset Management | TRIM | -32.1% | $212.8M | -$12.9M |
Key Facts
- 4 institutional buyers added $299.8M in net new positions, led by Assenagon Asset Management doubling to $351.9M (+$228.7M) and Rathbones Group adding $53.4M
- 3 institutional sellers trimmed $30.9M, led by Mediolanum International Funds cutting $17.9M and Congress Asset Management reducing $12.9M
- No insider open-market buying detected (Form 4 score 17/100, divergent from 13F cluster)
- All participants are asset managers — no activist or hedge fund names in the cluster
- Historical reports on ANET show strong average T+20 alpha of +10.12% with 80% win rate, but this cluster's mixed direction limits conviction
Financial Impact
4 institutional buyers accumulated $436.0M in current holdings (net change +$299.8M) while 3 sellers reduced holdings by $30.9M, for a net institutional inflow of approximately $268.9M
Risk Factors
- 45-day reporting lag means positions may have been unwound since quarter-end
- No insider buying corroborates the institutional thesis, reducing signal strength
- All participants are asset managers, not activist or event-driven funds, limiting catalyst-driven conviction
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-ANET-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 10, 2026 21d ago | Insider Cluster | $199.59 $199.39 | ▼ −0.10% | ▲ +0.12% | — |
Sep 3, 2026 28d ago | Insider Cluster | $193.78 $187.81 | ▼ −3.08% | ▼ −1.87% | — |
Aug 31, 2026 4w ago | Insider Cluster | $189.26 $192.93 | ▲ +1.94% | ▲ +1.86% | — |
Aug 31, 2026 4w ago | Insider Cluster | $189.26 $192.93 | ▲ +1.94% | ▲ +1.86% | — |
Aug 27, 2026 5w ago | Insider Cluster | $195.38 $193.78 | ▼ −0.82% | ▼ −0.93% | — |
Aug 25, 2026 5w ago | Insider Cluster | $202.25 $186.10 | ▼ −7.99% | ▼ −7.87% | — |
Aug 14, 2026 6w ago | Insider Cluster | $201.80 $188.15 | ▼ −6.76% | ▼ −5.57% | — |
Aug 10, 2026 7w ago | Insider Cluster | $197.85 $193.18 | ▼ −2.36% | ▼ −1.96% | — |
Aug 7, 2026 7w ago | Insider Cluster | $191.52 $201.80 | ▲ +5.37% | ▲ +5.41% | — |
Aug 6, 2026 8w ago | 144 | $188.67 $198.82 | ▲ +5.38% | ▲ +4.98% | — |
US Market Status
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