The divergence between active buyers (Capital World, Millennium) and passive sellers (Fidelity, UBS) suggests conviction buying by informed managers post-Q2 earnings, but the 45-day lag means the cluster may have already been unwound. Watch for insider Form 4 filings and next quarter's 13F to confirm whether active accumulation continued into Q3.
Executive Summary
In Q2 2026, 30 institutional buyers accumulated $372.2M in BeOne Medicines (ONC) while 16 sellers reduced holdings by $493.7M, resulting in a net reduction of $121.5M. The buying was concentrated among active asset managers and quant funds (Millennium, Capital World Investors, T. Rowe Price, RenTech), while the selling was dominated by a single mega-passive seller (Fidelity, trimming $390.6M). The cluster is mixed overall — active conviction buying is notable but offset by large passive outflows, and the 45-day reporting lag means positions may have shifted since quarter-end.
Key Financial Metrics
Institutional Positions
Net institutional flow: -$121.5M
▲ Buyers (30)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Capital World Investors | ADD | +38.6% | $641.1M | $159.2M |
| Millennium | DOUBLED | +165.2% | $154.8M | $94.0M |
| T. Rowe Price | ADD | +40.6% | $216.2M | $55.9M |
| JPMorgan | DOUBLED | +143% | $54.6M | $32.6M |
| Goldman Sachs | ADD | +63.1% | $44.9M | $16.2M |
▼ Sellers (16)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Fidelity | TRIM | -32.9% | $1.1B | -$390.6M |
| UBS | TRIM | -37.7% | $123.3M | -$49.7M |
| Jane Street Group | NEAR_EXIT | -87.6% | $22.6M | -$19.9M |
| Jennison Associates | TRIM | -34.8% | $45.9M | -$17.2M |
Key Facts
- 30 buyers added $372.2M in net new value; 16 sellers reduced by $493.7M; net -$121.5M across all tracked institutions.
- Top buyer: Capital World Investors added $159.2M (+38.6% to $641.1M). Millennium doubled its position (+$94.0M to $154.8M).
- Top seller: Fidelity trimmed $390.6M (-32.9% to $706.3M), accounting for 79% of total sell-side dollar outflow.
- Active managers (Capital World, Millennium, RenTech, Baillie Gifford) were net buyers; passive/index funds (Fidelity, UBS) were net sellers.
- The 13F data reflects positions as of June 30, 2026 — 45+ days stale. Q2 2026 earnings were reported on August 5, 2026, after quarter-end.
Financial Impact
30 institutions accumulated $372.2M in new positions while 16 reduced holdings by $493.7M, net -$121.5M. Fidelity alone accounted for $390.6M of the sell-side outflow.
Risk Factors
- 13F data is 45+ days stale; positions may have been reversed since quarter-end.
- Fidelity's large trim ($390.6M) could indicate a broader risk-off or sector rotation that outweighs active manager buying.
- No insider buying confluence was identified in the cross-filing context to corroborate the institutional accumulation 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-ONC-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 2, 2026 24d ago | Insider Cluster | $361.65 | awaiting T+20 | — | — |
Sep 22, 2026 4w ago | Institutional Cluster | $368.08 $384.50 | ▲ +4.46% | ▲ +5.02% | — |
Sep 10, 2026 6w ago | Insider Cluster | $346.51 $354.47 | ▲ +2.30% | ▲ +0.43% | — |
Sep 3, 2026 7w ago | Insider Cluster | $358.26 $361.65 | ▲ +0.95% | ▲ +0.09% | — |
Aug 26, 2026 8w ago | 8-K | $375.80 $365.67 | ▼ −2.70% | ▼ −3.90% | — |
Aug 13, 2026 10w ago | Insider Cluster | $347.48 $353.83 | ▲ +1.83% | ▲ +3.82% | — |
Aug 12, 2026 10w ago | Insider Cluster | $356.01 $346.51 | ▼ −2.67% | ▼ −0.92% | — |
Aug 10, 2026 11w ago | 144 | $359.27 $351.00 | ▲ +2.30% | ▲ +1.24% | — |
Aug 5, 2026 11w ago | Insider Cluster | $329.80 $362.68 | ▲ +9.97% | ▲ +9.37% | — |
Aug 5, 2026 11w ago | 8-K | $327.53 $361.78 | ▲ +10.46% | ▲ +11.06% | — |
US Market Status
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