Monitor next 13F filing to see if Congress Asset Management's conviction persists and whether Assenagon's near-exit was a one-quarter anomaly or the start of broader institutional distribution. The mixed signal with a slight bullish tilt does not warrant immediate action.
Executive Summary
A mixed institutional cluster in Rubrik (RBRK) during Q3 2026 shows four asset managers adding positions (net +$40.4M) while two others reduced (net -$17.5M). The buying is concentrated in Congress Asset Management, which added $38.6M to its stake, while Assenagon Asset Management nearly exited its position, selling $17.3M. The 45-day reporting lag and mixed net direction limit the signal's immediacy.
Key Financial Metrics
Institutional Positions
Net institutional flow: $22.9M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Congress Asset Management | ADD | +32.6% | $81.9M | $38.6M |
| Hb Wealth Management | ADD | +88.5% | $2.2M | $1.4M |
▼ Sellers (2)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | NEAR_EXIT | -83.7% | $22.5M | -$17.3M |
| Vontobel Holding | TRIM | -32.7% | $6.4M | -$262.0K |
Key Facts
- 4 institutional buyers added $40.4M in net new value during Q3 2026
- Congress Asset Management was the largest buyer, adding $38.6M (32.6% share increase)
- 2 institutional sellers reduced holdings by $17.5M, led by Assenagon's near-exit (-83.7% of shares)
- Net institutional flow was positive at approximately $22.9M ($40.4M buys - $17.5M sells)
- All participants are asset managers; no activist or quant funds detected
Financial Impact
Net institutional accumulation of approximately $22.9M during Q3 2026, with total buyer holdings reaching $84.9M and seller holdings dropping to $11.4M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- No insider buying corroboration to reinforce the institutional accumulation signal
- Mixed net direction (4 buyers vs 2 sellers) reduces conviction in a single 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-RBRK-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 23, 2026 4d ago | Institutional Cluster | $128.74 | awaiting T+60 | — | — |
Oct 12, 2026 15d ago | Institutional Cluster | $120.01 | awaiting T+60 | — | — |
Sep 25, 2026 4w ago | 144 | $113.09 | awaiting T+60 | — | — |
Sep 17, 2026 5w ago | Insider Cluster | $106.71 | awaiting T+60 | — | — |
Sep 10, 2026 6w ago | Insider Cluster | $86.65 | awaiting T+60 | — | — |
Sep 3, 2026 7w ago | Insider Cluster | $93.67 | awaiting T+60 | — | — |
Aug 28, 2026 8w ago | 3 | $93.04 | awaiting T+60 | — | — |
Aug 5, 2026 11w ago | Insider Cluster | $84.60 | awaiting T+60 | — | — |
Aug 4, 2026 12w ago | Insider Cluster | $84.81 | awaiting T+60 | — | — |
Jul 16, 2026 14w ago | Insider Cluster | $78.97 $120.01 | ▲ +51.97% | ▲ +47.29% | — |
US Market Status
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