The massive Fidelity and Jane Street accumulation suggests conviction in Illumina's post-Grail turnaround, but Corvex's trim and the 45-day reporting lag mean this cluster may already be stale. Watch for any Q3 13F amendments or insider buying to confirm the thesis remains active.
Executive Summary
A mixed institutional cluster for Illumina in Q2 2026 shows 54 buyers accumulating $1.02B net (dominated by Fidelity's $604.7M addition and strong adds from MFS, Goldman Sachs, and Jane Street) while 38 sellers trimmed only $23.1M net, with notable activist Corvex trimming 26% of its stake.
Key Financial Metrics
Institutional Positions
Net institutional flow: $997.0M
▲ Buyers (54)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Fidelity | DOUBLED | +192.4% | $795.4M | $604.7M |
| Massachusetts Financial Services | ADD | +70.4% | $308.5M | $181.2M |
| Goldman Sachs | ADD | +31.5% | $174.5M | $81.5M |
| Jane Street Group | DOUBLED | +4431% | $65.5M | $64.5M |
| Robeco Institutional Asset Management B.v. | DOUBLED | +346.5% | $54.1M | $45.6M |
▼ Sellers (38)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Corvex | TRIM | -26.1% | $472.0M | $25.7M |
| Millennium | TRIM | -58.6% | $25.2M | -$10.3M |
| UBS | TRIM | -27.7% | $143.3M | $4.5M |
| Vaughan Nelson Investment Management | TRIM | -26.2% | $106.5M | $5.7M |
| Eurizon Capital Sgr S.p.a. | TRIM | -57.9% | $5.2M | -$2.1M |
Key Facts
- 54 institutional buyers added $1.02B in net new positions vs 38 sellers trimming only $23.1M net
- Fidelity doubled its stake (+192.4%) adding $604.7M, now holding $795.4M
- Jane Street Group increased 44x (+4,431%) adding $64.5M to reach $65.5M
- MFS added 70.4% (+$181.2M) to hold $308.5M
- Activist Corvex trimmed 26.1% (-999K shares) but still holds $497.7M
- Millennium trimmed 58.6% (-$10.3M) and Eurizon trimmed 57.9% (-$2.1M)
- Aggregate buyer holdings $1.44B vs seller holdings $147.8M (net buyer-dominated)
Financial Impact
54 institutions accumulated $1.02B in new positions while 38 sellers reduced holdings by $23.1M net, a net institutional inflow of approximately $997M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound since quarter-end
- Corvex trimming 26% despite being an activist holder suggests potential thesis fatigue or exit strategy
- Mega-passive buyers (Fidelity, Goldman) may reflect index rebalancing rather than fundamental conviction
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-ILMN-2026-Q2 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 27, 2026 today | SC 13G/A | $269.42 | awaiting T+5 | — | — |
Oct 20, 2026 7d ago | Institutional Cluster | $282.86 | awaiting T+5 | — | — |
Oct 13, 2026 14d ago | 8-K | $271.76 $282.86 | ▲ +4.08% | ▲ +3.63% | — |
Oct 12, 2026 15d ago | Institutional Cluster | $276.67 $262.66 | ▼ −5.06% | ▼ −3.57% | — |
Oct 7, 2026 20d ago | SC 13G | $267.76 $271.76 | ▲ +1.49% | ▲ +2.47% | — |
Sep 30, 2026 28d ago | Court Ruling | $265.72 $264.57 | ▼ −0.43% | ▼ −1.73% | — |
Aug 27, 2026 8w ago | Insider Cluster | $215.59 $218.22 | ▲ +1.22% | ▲ +1.11% | — |
Aug 21, 2026 9w ago | Insider Cluster | $223.22 $213.63 | ▲ +4.30% | ▲ +4.77% | — |
Aug 17, 2026 10w ago | 8-K | $188.29 $224.99 | ▲ +19.49% | ▲ +19.69% | — |
Aug 12, 2026 10w ago | 8-K | $192.91 $205.00 | ▲ +6.27% | ▲ +6.71% | — |
US Market Status
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