Illumina, Inc.
Illumina, Inc. (ILMN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ILMN · as of Sep 30, 2025
Ownership Breakdown
817
Institutional Holders
▲ 35 vs Q2
$14.91B
Total Inst. Value
▲ $56.17M vs Q2
151.30M
Shares Outstanding
freeFloat 97.84%
157.23M
13F Shares Held
▲ 1.48M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ILMN largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CAPITAL WORLD INVESTORS laboratory analytical instruments | 19.98M | 12.64% | 12.64% | $1.90T | Nov 13, 2025 | ▲ 3.33M |
BLACKROCK, INC. laboratory analytical instruments | 18.69M | 11.83% | 11.83% | $1.77T | Nov 12, 2025 | ▼ 671.3K |
VANGUARD GROUP INC laboratory analytical instruments | 14.63M | 9.26% | 9.26% | $1.39T | Nov 7, 2025 | ▼ 525.2K |
STATE STREET CORP laboratory analytical instruments | 6.00M | 3.80% | 3.80% | $569.80B | Nov 14, 2025 | ▲ 382.5K |
SESSA CAPITAL IM, L.P. laboratory analytical instruments | 4.69M | 2.97% | 2.97% | $445.10B | Nov 14, 2025 | ▼ 36.1K |
LOOMIS SAYLES & CO L P laboratory analytical instruments | 4.29M | 2.71% | 2.71% | $407.18B | Nov 13, 2025 | ▲ 61.9K |
WCM INVESTMENT MANAGEMENT, LLC laboratory analytical instruments | 4.18M | 2.65% | 2.65% | $384.17B | Nov 4, 2025 | ▼ 244.8K |
CORVEX MANAGEMENT LP laboratory analytical instruments | 3.83M | 2.42% | 2.42% | $363.70B | Nov 14, 2025 | — held |
AQR CAPITAL MANAGEMENT LLC laboratory analytical instruments | 3.40M | 2.15% | 2.15% | $315.91B | Nov 14, 2025 | ▲ 102.1K |
GEODE CAPITAL MANAGEMENT, LLC laboratory analytical instruments | 2.74M | 1.73% | 1.73% | $259.30B | Nov 12, 2025 | ▼ 130.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+7.56M shares0
New Positions
first time holders24
Decreased
−6.40M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.17M
+7.56M / −6.40M
Net new holders
+0
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ILMN insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
43
Sell transactions
0.28
Buy/Sell ratio
$2M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Leckman Patricia SVP, Chief People Officer | Jun 2, 2026 | Sale | 176 | $160.66 | $28.3K | 22.6K | Form 4 ↗ |
Leckman Patricia SVP, Chief People Officer | Jun 2, 2026 | Sale | 318 | $162.00 | $51.5K | 22.3K | Form 4 ↗ |
Leckman Patricia SVP, Chief People Officer | Jun 2, 2026 | Sale | 290 | $163.02 | $47.3K | 22.0K | Form 4 ↗ |
Meister Keith A. director | May 28, 2026 | X-InTheMoney | 24,562 | $102.82 | $2.53M | 3.52M | Form 4 ↗ |
Meister Keith A. director | May 28, 2026 | J-Other | 24,562 | $156.40 | $3.84M | 3.50M | Form 4 ↗ |
Meister Keith A. director | May 28, 2026 | Sale | 37,590 | $156.50 | $5.88M | 3.46M | Form 4 ↗ |
Meister Keith A. director | May 28, 2026 | Sale | 71,986 | $157.38 | $11.33M | 3.39M | Form 4 ↗ |
Meister Keith A. director | May 28, 2026 | Sale | 110,424 | $147.50 | $16.29M | 3.28M | Form 4 ↗ |
Meister Keith A. director | May 29, 2026 | Sale | 11,760 | $159.57 | $1.88M | 3.27M | Form 4 ↗ |
Meister Keith A. director | May 29, 2026 | Sale | 4,579 | $160.50 | $734.9K | 3.26M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Illumina, Inc. (ILMN) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 2.16%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Illumina, Inc. is CAPITAL WORLD INVESTORS, holding approximately 19.98 million shares — equal to 12.64% of outstanding shares — as of September 30, 2025.
A total of 817 institutional investors currently hold ILMN stock, with a combined institutional value of approximately $14.91 billion as of the most recent 13F filing period.
Frequently asked questions
ILMN ownershipIllumina, Inc. (ILMN) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is CAPITAL WORLD INVESTORS with a 12.64% stake. Company insiders hold 2.16%. Data sourced from SEC Form 13F as of September 30, 2025.