13F · Illumina Inc
ILMN institutional ownership and 13F activity
Track ILMN institutional ownership through SEC 13F filings, including top shareholders, reported positions, portfolio weights, buys, sells, and quarterly holding trends.
Historical filing data, not live positions.Snapshot generated Sep 12, 2026 from SEC EDGAR 13F-HR information tables. 13F reports can arrive up to 45 days after quarter-end and omit many asset types.
01
ILMN Institutional Ownership Snapshot
See how many institutions reported ILMN, their combined market value, ownership concentration, and latest position changes.
Active holders1
Reported value$183.7M
Top 5 concentration100.0%
New holders0
Reduced holders1
Exited holders0
02
ILMN Ownership Takeaways
Highlights from the latest ILMN 13F filings, including the largest holder, biggest increase, largest reduction, and ownership concentration.
03
Who Owns ILMN? Institutional Holders
Compare 1 current and exited ILMN positions by manager, shares, reported market value, portfolio weight, and quarter-over-quarter change.
| Manager | Shares | Reported value | Portfolio weight | Share change | Status |
|---|---|---|---|---|---|
| Cathie Wood / ARK InvestJun 30, 2026 · CIK 0001697748 | 1M | $183.7M | 1.19% | -7.5% | Reduced |
04
ILMN Institutional Buying and Selling
See which institutions opened, increased, reduced, or exited ILMN positions compared with their previous 13F filing.
New 0
No holders in this category.
Increased 0
No holders in this category.
Reduced 1
ARK Invest$183.7M · -7.5%
Exited 0
No holders in this category.
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Types of Institutional Holders
Compare concentrated funds, diversified managers, and broad portfolios that reported ILMN. Categories are based on portfolio breadth, not SEC classifications.
Broad portfolios1
tracked holders06
ILMN Institutional Ownership by Quarter
Follow reported ILMN holders, shares, and market value across recent quarters. The institutions included may vary by filing period.
Q2 20261 holders
$183.7M1M sharesQ1 20261 holders
$139.2M1.1M sharesQ4 20251 holders
$202M1.5M sharesQ3 20251 holders
$139.4M1.5M sharesQ2 20252 holders
$111.5M1.5M shares| Quarter | Holders | Reported value | Shares | New | Exits |
|---|---|---|---|---|---|
| Jun 30, 2026 | 1 | $183.7M | 1M | 0 | 0 |
| Mar 31, 2026 | 1 | $139.2M | 1.1M | 0 | 0 |
| Dec 31, 2025 | 1 | $202M | 1.5M | 0 | 0 |
| Sep 30, 2025 | 1 | $139.4M | 1.5M | 0 | 1 |
| Jun 30, 2025 | 2 | $111.5M | 1.5M | 1 | 0 |
07
Stocks Held by Similar Institutions
Discover other stocks reported by institutions that also hold ILMN, and compare holder counts, market value, and concentration.
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Common Questions About ILMN
Who is the largest tracked institutional holder of ILMN?
ARK Invest is the largest active holder in the current ILMN sample, reporting $183.7M. The ILMN holder table ranks every matched manager.
Which institution increased its ILMN position the most?
No tracked institution reported an increase or new ILMN position in the current cycle.
Which institution reduced or exited ILMN most significantly?
ARK Invest recorded the largest reduction or exit by prior reported value at $139.2M.
Did new holders enter or existing holders exit ILMN?
0 new holders entered and 0 holders fully exited in the current filing cycle. Counts reflect the SEC 13F filings currently included on BasisPilot.
How concentrated is tracked ownership in ILMN?
The five largest tracked holders account for 100.0% of aggregate reported ILMN value. This is concentration within the tracked sample, not the entire market.
How has tracked ownership in ILMN changed across four quarters?
From the oldest comparable quarter to the latest, aggregate reported ILMN value among tracked managers increased by 64.8%. Manager coverage can vary by quarter.
What company evidence should be checked alongside ILMN's 13F changes?
Review Illumina Inc's latest earnings, SEC filings, guidance, capital allocation, and material company events. Delayed 13F data alone cannot confirm that a manager still holds the same position today.
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Sources and Methodology
Source: SEC EDGAR Form 13F-HR information tables. Positions are grouped by investment manager and ticker, then compared with the prior available filing. 13F data is delayed, historical, and does not represent a manager's complete or current portfolio.