Alkermes plc: Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in Alkermes plc. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
24
13F filers
Aggregate Value
$1.6B
Across holders
Last Price
—
EOD close
Sector
—
GICS
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| BAKER BROS. ADVISORS LP CIK 0001263508 | Hedge Fund | 10.01M | $524.6M | 31.9% | 2.6% | Unchanged | +$0 | Q2 2026 |
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 6.46M | $338.5M | 20.6% | 0.5% | Added | +$15.7M | Q2 2026 |
| Holocene Advisors, LP CIK 0001700574 | Hedge Fund | 3.60M | $188.7M | 11.5% | 0.4% | Added | +$67.3M | Q2 2026 |
| PRIMECAP MANAGEMENT CO/CA/ CIK 0000763212 | Institutional Manager | 2.53M | $132.5M | 8.1% | 0.1% | Reduced | $-593K | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 1.65M | $86.2M | 5.2% | 0.0% | Added | +$83.1M | Q2 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 0001165408 | Hedge Fund | 1.37M | $71.7M | 4.4% | 0.1% | New | — | Q2 2026 |
| SHAW D E & CO INC CIK 0001009207 | Hedge Fund | 1.31M | $68.7M | 4.2% | 0.0% | Added | +$67.3M | Q2 2026 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 1.04M | $54.4M | 3.3% | 0.0% | Added | +$13.5M | Q2 2026 |
| MARSHALL WACE, LLP CIK 0001318757 | Hedge Fund | 970K | $50.8M | 3.1% | 0.0% | Added | +$50.5M | Q2 2026 |
| Woodline Partners LP CIK 0001784547 | Hedge Fund | 560K | $29.4M | 1.8% | 0.1% | Added | +$90K | Q2 2026 |
Unchanged
Hedge Fund
$524.6M· 31.9% of total· 2.6% port· 10.01M sh· +$0 QoQ· Q2 2026
Added
Hedge Fund
$338.5M· 20.6% of total· 0.5% port· 6.46M sh· +$15.7M QoQ· Q2 2026
Added
Hedge Fund
$188.7M· 11.5% of total· 0.4% port· 3.60M sh· +$67.3M QoQ· Q2 2026
Reduced
Institutional Manager
$132.5M· 8.1% of total· 0.1% port· 2.53M sh· $-593K QoQ· Q2 2026
Added
Hedge Fund
$86.2M· 5.2% of total· 0.0% port· 1.65M sh· +$83.1M QoQ· Q2 2026
New
Hedge Fund
$71.7M· 4.4% of total· 0.1% port· 1.37M sh· — QoQ· Q2 2026
Added
Hedge Fund
$68.7M· 4.2% of total· 0.0% port· 1.31M sh· +$67.3M QoQ· Q2 2026
Added
Hedge Fund
$54.4M· 3.3% of total· 0.0% port· 1.04M sh· +$13.5M QoQ· Q2 2026
Added
Hedge Fund
$50.8M· 3.1% of total· 0.0% port· 970K sh· +$50.5M QoQ· Q2 2026
Added
Hedge Fund
$29.4M· 1.8% of total· 0.1% port· 560K sh· +$90K QoQ· Q2 2026
Added
Institutional Manager
$22.0M· 1.3% of total· 0.0% port· 419K sh· +$1.5M QoQ· Q2 2026
New
Hedge Fund
$16.7M· 1.0% of total· 0.0% port· 320K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$11.2M· 0.7% of total· 0.0% port· 213K sh· $-108.7M QoQ· Q2 2026
Added
Hedge Fund
$10.2M· 0.6% of total· 0.0% port· 195K sh· +$9.4M QoQ· Q2 2026
Added
Hedge Fund
$10.0M· 0.6% of total· 1.6% port· 190K sh· +$1.6M QoQ· Q2 2026
Added
Hedge Fund
$7.5M· 0.5% of total· 0.0% port· 142K sh· +$7.4M QoQ· Q2 2026
Reduced
Hedge Fund
$6.5M· 0.4% of total· 0.0% port· 124K sh· $-35.3M QoQ· Q2 2026
Reduced
Hedge Fund
$6.0M· 0.4% of total· 0.0% port· 115K sh· $-8.5M QoQ· Q2 2026
Reduced
Hedge Fund
$4.0M· 0.2% of total· 0.1% port· 77K sh· $-4.3M QoQ· Q2 2026
New
Hedge Fund
$1.7M· 0.1% of total· 0.0% port· 32K sh· — QoQ· Q2 2026
New
Hedge Fund
$1.4M· 0.1% of total· 0.0% port· 26K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$585K· 0.0% of total· 0.0% port· 11K sh· $-1.6M QoQ· Q2 2026
New
Hedge Fund
$306K· 0.0% of total· 0.0% port· 6K sh· — QoQ· Q2 2026
Added
Hedge Fund
$133K· 0.0% of total· 0.0% port· 3K sh· +$3K QoQ· Q2 2026
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