As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Boston Beer Co Inc. The largest reported stake is C. James Koch's, at 21.62%. 12 filings are on record since November 14, 2025 (Schedule 13G/A, February 11, 2026).
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Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 1,087,506 · Shared voting: 0 · Sole dispositive: 1,104,030 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-27
- · Reporting person: AQR Capital Management, LLC · Sole voting: 0 · Shared voting: 539,988 · Sole dispositive: 0 · Shared dispositive: 539,988 · SCHEDULE 13G/A, 2026-08-13
- · Reporting person: Millennium Management LLC · Sole voting: 0 · Shared voting: 409,624 · Sole dispositive: 0 · Shared dispositive: 411,413 · SCHEDULE 13G, 2026-07-22
- · Holder: BlackRock, Inc. · Percent: 11.3% · SCHEDULE 13G/A
- · Holder: AQR Capital Management, LLC · Percent: 7.78% · SCHEDULE 13G/A
Boston Beer Co Inc has 12 Schedule 13D or 13G filings on record since 2025-11-14. 4 holders' latest filing reports 5% or more of class a stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 21.62% | 2,271,472 | SCHEDULE 13G/A, 2026-02-11 | 2025-12-31 | |
| BlackRock, Inc. | 13.4% | 1,104,030 | SCHEDULE 13G/A, 2026-10-27 | 2026-09-30 |
| Vanguard Portfolio Management | 7.58% | 635,388 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| AQR Capital Management, LLC | 6.47% | 539,988 | SCHEDULE 13G/A, 2026-08-13 | 2026-06-30 |
| Millennium Management LLC | 4.9% | 411,413 | SCHEDULE 13G, 2026-07-22 | 2026-07-16 |
| Fmr LLC | 2.3% | 195,365 | SCHEDULE 13G/A, 2026-05-06 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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Keep reading
More on Boston Beer Co Inc and the records around it.
Boston Beer Co Inc elsewhere on the record
- Leadership changes Aug 2026
- Who owns it
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)
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What the Full Report on Boston Beer Co Inc covers
The Short Answer
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What They Do, And How The Money Works
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Who Pays Them, And Who They Are Up Against
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| BlackRock, Inc. | 1,087,506 | 0 | 1,104,030 | 0 | SCHEDULE 13G/A, 2026-10-27 |
| AQR Capital Management, LLC | 0 | 539,988 | 0 | 539,988 | SCHEDULE 13G/A, 2026-08-13 |
| AQR Capital Management Holdings, LLC | 0 | 539,988 | 0 | 539,988 | SCHEDULE 13G/A, 2026-08-13 |
| Millennium Management LLC | 0 | 409,624 | 0 | 411,413 | SCHEDULE 13G, 2026-07-22 |
| Millennium Group Management LLC | 0 | 409,624 | 0 | 411,413 | SCHEDULE 13G, 2026-07-22 |
| Israel A. Englander | 0 | 409,624 | 0 | 411,413 | SCHEDULE 13G, 2026-07-22 |
The latest filing identifies Boston Beer Co Inc by CUSIP 100557107 and gives its principal executive office as ONE DESIGN CENTER PLACE SUITE 850, Boston, MA 02210 (SCHEDULE 13G/A, 2026-10-27).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-14 | AQR Capital Management, LLC | 7.34% | SCHEDULE 13G |
| 2026-01-30 | The Vanguard Group | 12.09% | SCHEDULE 13G/A |
| 2026-02-11 | C. James Koch | 21.62% | SCHEDULE 13G/A |
| 2026-02-12 | AQR Capital Management, LLC | 5.12% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 7.58% | SCHEDULE 13G |
| 2026-05-06 | Fmr LLC | 2.3% | SCHEDULE 13G/A |
| 2026-05-14 | AQR Capital Management, LLC | 7.78% | SCHEDULE 13G/A |
| 2026-07-08 | BlackRock, Inc. | 11.3% | SCHEDULE 13G/A |
| 2026-07-22 | Millennium Management LLC | 4.9% | SCHEDULE 13G |
| 2026-08-13 | AQR Capital Management, LLC | 6.47% | SCHEDULE 13G/A |
| 2026-10-27 | BlackRock, Inc. | 13.4% | SCHEDULE 13G/A |
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.
Also on the record for Boston Beer Co Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 20, 2026 | Leadership change: Diego Reynoso departs, Chief Financial Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.