As of November 6, 2026, Alkermes plc. is a publicly traded company (Nasdaq: ALKS); its largest reported holder is Baker Bros. Advisors LP, with 6.1% on Schedule 13G of February 17, 2026, then Vanguard (5.8%). The largest insider holding is Richard F. Pops, the chief executive and alkermes plc, with 1,377,740 shares (0.82% of shares outstanding), per Form 4 of February 6, 2026 (Schedule 13G, February 17, 2026).
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Is Alkermes plc. a real, registered company?
- Alkermes plc. files with the SEC under CIK 1520262 (its SEC filings).
- Its shares are listed under the ticker ALKS on Nasdaq (SEC company record).
- business address in Dublin 4, L2, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under ALKERMES PLC in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Anne C. Whitaker, Director (Form 8-K filed 2026-09-16). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Vanguard (filed 2026-04-28).
Who are Alkermes plc.'s owners and officers?
Alkermes plc.: business address in Dublin 4, L2; industry Pharmaceutical Preparations (Form D, 2026-09-16).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-05-15 | T. Rowe Price Associates, Inc. | 2.8% |
| Schedule 13G, 2026-04-28 | Vanguard Capital Management | 5.21% |
| Schedule 13G, 2026-04-28 | Vanguard Portfolio Management | 5.8% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G, 2026-02-17 | Baker Bros. Advisors LP | 6.1% |
| Schedule 13G, 2025-11-10 | State Street Corporation | 5.2% |
| Schedule 13G/A, 2025-08-14 | T. Rowe Price Associates, Inc. | 6.1% |
Questions about who owns Alkermes plc.
Who owns Alkermes plc.?
On this page, 4 holders' latest ownership filings report 5% or more of Alkermes plc.: Baker Bros. Advisors LP (6.1%, Schedule 13G, filed 2026-02-17), Vanguard Portfolio Management (5.8%, Schedule 13G, filed 2026-04-28), Vanguard Capital Management (5.21%, Schedule 13G, filed 2026-04-28) and State Street Corporation (5.2%, Schedule 13G, filed 2025-11-10).
Who are the largest shareholders of Alkermes plc.?
By the share each holder's latest filing reports, the largest holders of Alkermes plc. on this page are Baker Bros. Advisors LP (6.1%), Vanguard Portfolio Management (5.8%) and Vanguard Capital Management (5.21%).
When did Baker Bros. Advisors LP buy into Alkermes plc.?
The filings give report dates, not purchase dates. The earliest filing from Baker Bros. Advisors LP on this page is the Schedule 13G, filed 2026-02-17, reporting 6.1%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-16 | Anne C. Whitaker | Director | appointed |
Which insiders own Alkermes plc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and alkermes plc: 1,377,740 shares (0.82% of shares outstanding) (Form 4, 2026-02-06).
- , the chief operating officer and executive vice president: 241,308 shares (0.14% of shares outstanding) (Form 4, 2026-02-27).
- , the executive vice president and chief legal officer: 219,353 shares (0.13% of shares outstanding) (Form 4, 2026-11-03).
- , the chief financial officer and senior vice president: 148,196 shares (0.09% of shares outstanding) (Form 4, 2025-02-28).
- , a director: 106,679 shares (0.06% of shares outstanding) (Form 4, 2026-05-22).
Shares outstanding: 168,043,540 as of 2026-10-30, from the company's latest SEC cover page.
How much has Alkermes plc. raised?
Acquisitions reported on Form 8-K, Item 2.01: acquired Avadel (2026-02-12).
Keep reading
More on Alkermes plc. and the records around it.
Alkermes plc. elsewhere on the record
- Leadership changes Sep 2026
- Acquisition Feb 2026
Companies that share a holder
- Baker Bros. Advisors LP also filed stake reports on 25 other companies: Madrigal Pharmaceuticals, Inc. (Nov 2026), Kodiak Sciences Inc. (Sep 2026), BeOne Medicines Ltd. (Sep 2026)
- T. Rowe Price Associates, Inc. also filed stake reports on 191 other companies: PACIFIC BIOSCIENCES OF CALIF (Nov 2026), APARTMENT INVT & MGMT CO -A (Oct 2026), BETA BIONICS INC (Oct 2026)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
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