The buying cluster is small relative to IBKR's $60B+ market cap and dominated by asset managers, not event-driven funds. The Assenagon trim (-$32.1M) is larger than all four buys combined, creating a net outflow. Monitor next quarter's 13F for follow-through from the doublers (Concurrent) and whether the large seller continues to exit.
Executive Summary
Four asset managers added to their IBKR positions in Q3 2026, accumulating $14.5M in net new value, while one large holder trimmed $32.1M. The buying cluster is modest in scale and dominated by small-to-mid-size advisors, not high-conviction activists or quant funds. The cluster follows a Q3 earnings miss (EPS -9.4% vs consensus) and a sequential DARTs decline, suggesting the buying may reflect long-term account growth trends rather than a near-term catalyst.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$17.6M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Wealth Enhancement Advisory Services | ADD | +35.2% | $4.4M | $854.0K |
| Mather Group | ADD | +70.4% | $56.0K | $23.0K |
| Concurrent Investment Advisors | DOUBLED | +312.4% | $8.5M | $6.4M |
| Td Waterhouse Canada | ADD | +25% | $55.5M | $7.3M |
▼ Sellers (1)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | TRIM | -56.4% | $56.2M | -$32.1M |
Key Facts
- 4 institutional buyers added $14.5M in net new value during Q3 2026
- 1 seller (Assenagon) trimmed $32.1M, reducing its position by 56.4%
- Largest buyer by dollar value: TD Waterhouse Canada added $7.3M (+25%)
- Highest conviction buyer: Concurrent Investment Advisors more than quadrupled its position (+312.4%, +$6.4M)
- Cluster follows Q3 2026 earnings miss (EPS $0.69 vs $0.74 consensus) and -11% QoQ DARTs decline
Financial Impact
Net institutional buying of $14.5M vs selling of $32.1M, for a net outflow of $17.6M across 5 tracked funds
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Net selling ($17.6M outflow) outweighs buying conviction despite 4:1 buyer count
- Q3 earnings miss and declining DARTs may weigh on near-term sentiment
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-IBKR-2026-Q3 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 16, 2026 10d ago | Institutional Cluster | $81.35 $81.82 | ▲ +0.58% | ▲ +0.72% | — |
Oct 15, 2026 11d ago | 8-K | $82.69 $82.28 | ▲ +0.50% | ▲ +0.59% | — |
Jul 31, 2026 12w ago | 8-K | $87.99 $87.83 | ▼ −0.18% | ▼ −3.69% | — |
Jul 31, 2026 12w ago | S-3ASR | $87.99 $87.83 | ▼ −0.18% | ▼ −3.69% | — |
Apr 21, 2026 26w ago | 8-K | $77.80 $77.09 | ▼ −0.91% | ▼ −0.96% | — |
US Market Status
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