As of November 6, 2026, Boston Beer Co. Inc. is a publicly traded company (NYSE: SAM); its largest reported holder is BlackRock, with 13.4% on Schedule 13G/A of October 27, 2026, then Vanguard (7.58%). The largest insider holding is C. James Koch, the chairman and chief executive, with 207,328 shares, per Form 4 of October 28, 2026 (Schedule 13G/A, October 27, 2026).
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Is Boston Beer Co. Inc. a real, registered company?
- Boston Beer Co Inc files with the SEC under CIK 949870 (its SEC filings).
- Its shares are listed under the ticker SAM on NYSE (SEC company record).
- Incorporated in Massachusetts; business address in Boston, Massachusetts, 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 BOSTON BEER CO INC in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Diego Reynoso, Chief Financial Officer (Form 8-K filed 2026-08-20). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-10-27).
Who are Boston Beer Co. Inc.'s owners and officers?
Boston Beer Co. Inc.: incorporated in Massachusetts; business address in Boston, Massachusetts; industry Malt Beverages (Schedule 13G/A, 2026-10-27).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-27 | Blackrock, Inc. | 13.4% |
| Schedule 13G/A, 2026-08-13 | Aqr Capital Management, LLC | 6.47% |
| Schedule 13G, 2026-07-22 | Millennium Management LLC | 4.9% |
| Schedule 13G/A, 2026-07-08 | Blackrock, Inc. | 11.3% |
| Schedule 13G/A, 2026-05-14 | Aqr Capital Management, LLC | 7.78% |
| Schedule 13G/A, 2026-05-06 | Fmr LLC | 2.3% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 7.58% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-02-12 | Aqr Capital Management, LLC | 5.12% |
| Schedule 13G/A, 2026-02-11 | C. James Koch | 21.62% |
| Schedule 13G/A, 2026-01-30 | The Vanguard Group | 12.09% |
| Schedule 13G, 2025-11-14 | Aqr Capital Management, LLC | 7.34% |
Questions about who owns Boston Beer Co. Inc.
Who owns Boston Beer Co. Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Boston Beer Co. Inc.: C. James Koch (21.62%, Schedule 13G/A, filed 2026-02-11), Blackrock, Inc. (13.4%, Schedule 13G/A, filed 2026-10-27), Vanguard Portfolio Management (7.58%, Schedule 13G, filed 2026-04-29) and Aqr Capital Management, LLC (6.47%, Schedule 13G/A, filed 2026-08-13).
Who are the largest shareholders of Boston Beer Co. Inc.?
By the share each holder's latest filing reports, the largest holders of Boston Beer Co. Inc. on this page are C. James Koch (21.62%), Blackrock, Inc. (13.4%) and Vanguard Portfolio Management (7.58%).
When did C. James Koch buy into Boston Beer Co. Inc.?
The filings give report dates, not purchase dates. The earliest filing from C. James Koch on this page is the Schedule 13G/A, filed 2026-02-11, reporting 21.62%. 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%); 12 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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What the Full Report on Boston Beer Co. Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
19 cited sources found
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-08-20 | Diego Reynoso | Chief Financial Officer | departed |
Which insiders own Boston Beer Co. 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.
- , the chairman and chief executive: 207,328 shares, 16,483 held directly and 190,845 indirectly (Form 4, 2026-10-28).
- , a director: 158,694 shares, 6,097 held directly and 152,597 indirectly (Form 4, 2026-11-02).
- , the chief operating officer: 45,301 shares (Form 4, 2026-03-03).
- , the chief financial officer and treasurer: 26,376 shares (Form 4, 2026-03-03).
- , the chief sales officer: 23,418 shares (Form 4, 2026-03-03).
Shares only: the company's cover page does not give one share count for a single class, so no percentage is worked out.
How much has Boston Beer Co. Inc. raised?
No fundraising or offering filing from Boston Beer Co. Inc. is on file with us.
Keep reading
More on Boston Beer Co. Inc. and the records around it.
Boston Beer Co. Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
- Leadership changes Aug 2026
Companies that share a holder
- Millennium Management LLC also filed stake reports on 121 other companies: StepStone Group Inc. (Nov 2026), Catalyst Acquisition Corp. (Nov 2026), RxSight, Inc. (Nov 2026)
- AQR Capital Management, LLC also filed stake reports on 190 other companies: Bold Eagle Acquisition Corp. (Nov 2026), Centurion Acquisition Corp. (Aug 2026), FG Merger II Corp. n/k/a BOXABL Inc. (Aug 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
Related pages
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