As of November 6, 2026, Acadia Pharmaceuticals Inc. is a publicly traded company (Nasdaq: ACAD). The largest holder reporting an active stake on Schedule 13D is Baker Bros. Advisors LP, at 25.4%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include State Street (5.3%), Vanguard (5.15%) (Schedule 13D/A, February 26, 2026).
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Is Acadia Pharmaceuticals Inc. a real, registered company?
- Acadia Pharmaceuticals Inc files with the SEC under CIK 1070494 (its SEC filings).
- Its shares are listed under the ticker ACAD on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in San Diego, California, 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 ACADIA PHARMACEUTICALS INC in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Z. Thompson (Form 8-K filed 2026-05-01). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names State Street (filed 2026-08-07).
Who are Acadia Pharmaceuticals Inc.'s owners and officers?
Acadia Pharmaceuticals Inc.: incorporated in Delaware; business address in San Diego, California; industry Pharmaceutical Preparations (Schedule 13G, 2026-08-07).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-08-07 | State Street Corporation | 5.3% |
| Schedule 13G, 2026-04-28 | Vanguard Portfolio Management | 5.15% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13D/A, 2026-02-26 | Baker Bros. Advisors LP | 25.4% |
| Schedule 13G/A, 2025-11-14 | Rtw Investments, LP | 4.2% |
Questions about who owns Acadia Pharmaceuticals Inc.
Who owns Acadia Pharmaceuticals Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Acadia Pharmaceuticals Inc.: Baker Bros. Advisors LP (25.4%, Schedule 13D/A, filed 2026-02-26), State Street Corporation (5.3%, Schedule 13G, filed 2026-08-07) and Vanguard Portfolio Management (5.15%, Schedule 13G, filed 2026-04-28).
Who are the largest shareholders of Acadia Pharmaceuticals Inc.?
By the share each holder's latest filing reports, the largest holders of Acadia Pharmaceuticals Inc. on this page are Baker Bros. Advisors LP (25.4%), State Street Corporation (5.3%) and Vanguard Portfolio Management (5.15%).
When did Baker Bros. Advisors LP buy into Acadia Pharmaceuticals Inc.?
The filings give report dates, not purchase dates. The earliest filing from Baker Bros. Advisors LP on this page is the Schedule 13D/A, filed 2026-02-26, reporting 25.4%. That earliest filing is itself an amendment, which updates an earlier report.
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%); 5 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, 2026-05-01 | Z. Thompson | departed |
Which insiders own Acadia Pharmaceuticals Inc. 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.
- , a director and 10% owner: 39,487,463 shares (22.8% of shares outstanding), 102,876 held directly and 39,384,587 indirectly, on a joint filing (Form 4, 2026-06-02).
- 667, L.P., a director and 10% owner: 39,487,463 shares (22.8% of shares outstanding), 102,876 held directly and 39,384,587 indirectly, on a joint filing (Form 4, 2026-06-02).
- Baker Bros. Advisors LP, a director and 10% owner: 39,487,463 shares (22.8% of shares outstanding), 102,876 held directly and 39,384,587 indirectly, on a joint filing (Form 4, 2026-06-02).
- Baker Bros. Advisors (GP) LLC, a director and 10% owner: 39,487,463 shares (22.8% of shares outstanding), 102,876 held directly and 39,384,587 indirectly, on a joint filing (Form 4, 2026-06-02).
- , a director and 10% owner: 39,487,463 shares (22.8% of shares outstanding), 102,876 held directly and 39,384,587 indirectly, on a joint filing (Form 4, 2026-06-02).
Shares outstanding: 172,828,972 as of 2026-10-28, from the company's latest SEC cover page.
How much has Acadia Pharmaceuticals Inc. raised?
No fundraising or offering filing from Acadia Pharmaceuticals Inc. is on file with us.
Keep reading
More on Acadia Pharmaceuticals Inc. and the records around it.
Acadia Pharmaceuticals Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
- Leadership changes May 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)
- RTW Investments, LP also filed stake reports on 43 other companies: CG Oncology, Inc. (Aug 2026), iRhythm Holdings, Inc. (Aug 2026), Kailera Therapeutics, Inc. (Aug 2026)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ALLEGION PLC (Aug 2026)
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