The 13F data is 45+ days stale — confirm whether the buying persisted into Q4 2026 via next 13F batch. If Assenagon and Robeco continue accumulating, it would reinforce the thesis; any reversal would weaken the cluster signal.
Executive Summary
Five institutional asset managers, led by Assenagon and Robeco, collectively added $483.2M in ABNB positions during Q3 2026, while only one small seller trimmed $67K. The cluster is overwhelmingly bullish, with two large managers doubling or adding over 60% to their stakes, signaling conviction in Airbnb's business trajectory.
Key Financial Metrics
Institutional Positions
Net institutional flow: $483.1M
▲ Buyers (5)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | DOUBLED | +114.6% | $546.5M | $319.6M |
| Robeco Institutional Asset Management B.v. | ADD | +61.1% | $353.6M | $158.2M |
| Concurrent Investment Advisors | ADD | +69.1% | $1.8M | $865.0K |
| Nisa Investment Advisors | ADD | +29.6% | $8.2M | $2.5M |
| Hb Wealth Management | ADD | +46.1% | $5.2M | $2.0M |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Davenport & Co | TRIM | -29.4% | $325.0K | -$67.0K |
Key Facts
- 5 buyers accumulated $483.2M in net new positions, totaling $915.3M in current holdings
- Assenagon Asset Management doubled its stake (+114.6%), adding $319.6M in value
- Robeco Institutional Asset Management added 61.1% (+$158.2M in value)
- Only 1 seller (Davenport & Co trimmed $67K — negligible at $257K remaining)
- All participants are active asset managers — no passive/index funds absent from the cluster
Financial Impact
5 institutions accumulated $483.2M in new ABNB positions (net buying $483.1M after the sole $67K trim); total disclosed institutional holdings in the cluster rose to $915.3M
Risk Factors
- 13F reporting lag: positions may have been partially or fully unwound since quarter-end
- Cluster is entirely long-only; short interest or hedging activity is not captured
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-ABNB-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 1d ago | 144 | $171.05 | awaiting T+60 | — | — |
Oct 23, 2026 4d ago | Institutional Cluster | $172.01 | awaiting T+60 | — | — |
Oct 19, 2026 8d ago | Insider Cluster | $176.94 | awaiting T+60 | — | — |
Oct 15, 2026 12d ago | 144 | $174.28 | awaiting T+60 | — | — |
Oct 1, 2026 26d ago | Press Release | $162.43 | awaiting T+60 | — | — |
Sep 17, 2026 5w ago | Insider Cluster | $166.22 | awaiting T+60 | — | — |
Sep 15, 2026 6w ago | 144 | $168.32 | awaiting T+60 | — | — |
Sep 8, 2026 7w ago | ANALYST-UPGRADE | $174.54 | awaiting T+60 | — | — |
Sep 3, 2026 7w ago | Insider Cluster | $181.94 | awaiting T+60 | — | — |
Sep 1, 2026 8w ago | 144 | $182.55 | awaiting T+60 | — | — |
US Market Status
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