The cluster is dominated by small asset managers with no activist or high-conviction fund participation, and the sole seller's reduction is 6x larger than all buying combined. Monitor upcoming 13F filings for Q4 2026 to see if Congress Asset Management continued reducing or if new large buyers emerged.
Executive Summary
A small institutional cluster formed in RAMBUS INC during Q3 2026, with 5 asset managers adding positions totaling $10.9M in net buying value, while one large holder (Congress Asset Management) trimmed $65.2M. The buying is concentrated among small-to-mid-sized asset managers, while the sole seller's reduction dwarfs the aggregate buying, resulting in a net negative dollar flow of -$54.3M. The cluster is too small in absolute dollar terms and too stale (45-day lag) to carry a strong signal.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$54.3M
▲ Buyers (5)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Wealth Enhancement Advisory Services | DOUBLED | +284.9% | $2.3M | $619.0K |
| Assenagon Asset Management | DOUBLED | +304.4% | $13.8M | $9.5M |
| Td Waterhouse Canada | ADD | +26.8% | $17.0K | $2.0K |
| Vontobel Holding | ADD | +58.7% | $1.1M | $229.0K |
| Hb Wealth Management | DOUBLED | +217.6% | $847.0K | $515.0K |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Congress Asset Management | TRIM | -54.1% | $103.3M | -$65.2M |
Key Facts
- 5 buyers added a net $10.9M in RMBS positions during Q3 2026
- 1 seller (Congress Asset Management) reduced its stake by $65.2M, or 54.1% of its prior position
- Net dollar flow across the cluster was negative $54.3M due to the large trim by Congress Asset Management
- All 5 buyers are asset managers; no activist, quant, or family office funds participated
- The largest buyer, Assenagon Asset Management, more than quadrupled its position to $13.8M
Financial Impact
Aggregate buying of $10.9M by 5 institutions was offset by a single $65.2M trim, for a net negative $54.3M in institutional dollar flow during Q3 2026.
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- The net dollar flow is heavily negative due to one large seller, suggesting institutional distribution rather than accumulation
- No activist or high-conviction fund participation weakens the 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-RMBS-2026-Q3 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | 8-K | $87.05 | awaiting T+60 | — | — |
Oct 23, 2026 3d ago | Institutional Cluster | $85.65 | awaiting T+60 | — | — |
Aug 5, 2026 11w ago | 8-K | $97.30 | awaiting T+60 | — | — |
Jul 27, 2026 13w ago | 8-K | $87.75 $92.80 | ▲ +5.75% | ▲ +1.40% | — |
Jun 3, 2026 20w ago | Insider Cluster | $169.35 $85.76 | ▼ −49.36% | ▼ −51.24% | — |
Jun 2, 2026 20w ago | Insider Cluster | $170.66 $91.11 | ▼ −46.61% | ▼ −49.11% | — |
May 27, 2026 21w ago | Insider Cluster | $148.02 $91.24 | ▼ −38.36% | ▼ −40.09% | — |
May 26, 2026 21w ago | Insider Cluster | $148.66 $92.15 | ▼ −38.01% | ▼ −39.89% | — |
May 7, 2026 24w ago | Insider Cluster | $126.60 $92.21 | ▼ −27.16% | ▼ −31.00% | — |
Apr 29, 2026 25w ago | 8-K | $115.11 $96.42 | ▼ −16.24% | ▼ −19.34% | — |
US Market Status
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