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ALKS · Alkermes plc.

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Market Cap
$7.80B
Shares
167.76M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 425
Total Value: $9,406,800,371
Total Shares: 179,524,956
Showing 1–100 of 437 holdings by value · page 1 of 5

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 425 13F filers · Δ vs Mar 31, 2026
Top Holder
16.3%
Sep 2023 → Jun 2026 · range 11.3% – 17.1%
+0.3 pts
Top 5
36.4%
Sep 2023 → Jun 2026 · range 36.4% – 46.6%
−0.1 pts
Top 10
50.8%
Sep 2023 → Jun 2026 · range 50.8% – 61.2%
−0.2 pts
HHI
453
Sep 2023 → Jun 2026 · range 403 – 612
Broadly held+3

Quarterly Activity

vs Mar 31, 2026
New
91
Increased
144
Decreased
134
Sold Out
59
Unchanged
56
Holder count: +32
Institutional value: +50.2%
Shares held: +1.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 437
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1520262 CUSIP G01767105 13F (30d) 304 filings 298 filers Visit website Investor relations