Who owns The Boston Beer Company (SAM)
Which tracked institutional funds hold SAM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SAM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
Conviction spread
SAM’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes SAM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in SAM divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, we do not read how tracked institutions changed their SAM positions: many holders could not be matched across the two filings, most often because the security’s identifier changed and our mapping is incomplete, or because funds are still filing for the newer quarter. Over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 1,015,254 | $180M | 12.6% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 609,360 | $108M | 7.5% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 539,988 | $96M | 6.7% | 2026-Q2 |
| UBS Group AG added | 434,656 | $77M | 5.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 385,326 | $68M | 4.8% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 345,822 | $61M | 4.3% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 321,080 | $57M | 4.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 320,885 | $57M | 4.0% | 2026-Q2 |
| STATE STREET CORP added | 314,732 | $56M | 3.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 283,512 | $50M | 3.5% | 2026-Q2 |
| Global Alpha Capital Management Ltd. added | 267,567 | $47M | 3.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 205,368 | $36M | 2.5% | 2026-Q2 |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ added | 146,043 | $26M | 1.8% | 2026-Q2 |
| SOUTHERNSUN ASSET MANAGEMENT, LLC added | 131,877 | $23M | 1.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 130,819 | $23M | 1.6% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 126,182 | $22M | 1.6% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC new | 117,548 | $21M | 1.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 104,302 | $18M | 1.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 103,039 | $18M | 1.3% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 102,562 | $18M | 1.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 102,179 | $18M | 1.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 99,454 | $18M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 98,799 | $17M | 1.2% | 2026-Q2 |
| Trexquant Investment LP added | 73,254 | $13M | 0.9% | 2026-Q2 |
| Calamos Advisors LLC trimmed | 65,364 | $12M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp added | 63,464 | $11M | 0.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 63,070 | $11M | 0.8% | 2026-Q2 |
| WORLDQUANT MILLENNIUM ADVISORS LLC new | 62,666 | $11M | 0.8% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 62,634 | $11M | 0.8% | 2026-Q2 |
| FMR LLC trimmed | 60,625 | $11M | 0.8% | 2026-Q2 |
| Invesco Ltd. trimmed | 58,648 | $10M | 0.7% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 58,288 | $10M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 52,748 | $9M | 0.7% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 48,829 | $9M | 0.6% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 45,318 | $8M | 0.6% | 2026-Q2 |
| Prescott General Partners LLC | 45,000 | $8M | 0.6% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 42,474 | $8M | 0.5% | 2026-Q2 |
| GABELLI FUNDS LLC added | 42,400 | $8M | 0.5% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 35,905 | $7M | 0.5% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 33,447 | $6M | 0.4% | 2026-Q2 |
| WINTON GROUP Ltd added | 33,018 | $6M | 0.4% | 2026-Q2 |
| Edgestream Partners, L.P. added | 32,914 | $6M | 0.4% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 32,567 | $6M | 0.4% | 2026-Q2 |
| Darwins River Capital, LP new | 30,820 | $5M | 0.4% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 30,517 | $5M | 0.4% | 2026-Q2 |
| ING GROEP NV new | 29,300 | $5M | 0.4% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL added | 28,352 | $5M | 0.4% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 27,251 | $5M | 0.3% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP added | 26,691 | $5M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 23,416 | $4M | 0.3% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 21,786 | $4M | 0.3% | 2026-Q2 |
| Bridgewater Associates, LP added | 18,630 | $3M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 17,853 | $3M | 0.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 17,575 | $3M | 0.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 17,353 | $3M | 0.2% | 2026-Q2 |
| NOMURA HOLDINGS INC trimmed | 16,534 | $3M | 0.2% | 2026-Q2 |
| Odyssean, LLC added | 16,344 | $3M | 0.2% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 15,846 | $3M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 15,684 | $3M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 15,100 | $3M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 14,841 | $3M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 14,469 | $3M | 0.2% | 2026-Q2 |
| CenterBook Partners LP added | 13,820 | $2M | 0.2% | 2026-Q2 |
| XTX Topco Ltd added | 13,712 | $2M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 13,652 | $2M | 0.2% | 2026-Q2 |
| CAXTON ASSOCIATES LLP new | 12,900 | $2M | 0.2% | 2026-Q2 |
| Creative Planning trimmed | 12,350 | $2M | 0.2% | 2026-Q2 |
| WEDGE CAPITAL MANAGEMENT L L P/NC added | 12,238 | $2M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 12,018 | $2M | 0.1% | 2026-Q2 |
| Oak Thistle LLC added | 11,934 | $2M | 0.1% | 2026-Q2 |
| Savoir Faire Capital Management, L.P. trimmed | 11,897 | $2M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 11,796 | $2M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 11,156 | $2M | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC trimmed | 10,691 | $2M | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 10,324 | $2M | 0.1% | 2026-Q2 |
| BCGM Wealth Management, LLC added | 10,247 | $2M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 9,610 | $2M | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd added | 9,452 | $2M | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 8,947 | $2M | 0.1% | 2026-Q2 |
| Numerai GP LLC added | 8,867 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 8,750 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 8,515 | $2M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 8,105 | $1M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 8,097 | $1M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 8,075 | $1M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 7,989 | $1M | 0.1% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 7,732 | $1M | 0.1% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec added | 7,552 | $1M | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 7,438 | $1M | 0.1% | 2026-Q2 |
| GAGNON SECURITIES LLC added | 7,283 | $1M | 0.1% | 2026-Q2 |
| Jain Global LLC added | 7,086 | $1M | 0.1% | 2026-Q2 |
| OPPENHEIMER ASSET MANAGEMENT INC. added | 6,821 | $1M | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 6,784 | $1M | 0.1% | 2026-Q2 |
| OSSIAM new | 6,720 | $1M | 0.1% | 2026-Q2 |
| Atom Investors LP trimmed | 6,470 | $1M | 0.1% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT added | 6,449 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 6,103 | $1M | 0.1% | 2026-Q2 |
| TORONTO DOMINION BANK trimmed | 5,976 | $1M | 0.1% | 2026-Q2 |
| denkapparat Operations GmbH | 5,616 | $994K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC trimmed | 5,519 | $976K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.