The Boston Beer Company, Inc.
US ˙ NYSE ˙ US1005571070

SecuritySAM / The Boston Beer Company, Inc.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership45,645 shares
Latest Disclosed Value $ 10,516,608
Marshall Wace, Llp reports 69.56% increase in ownership of SAM / The Boston Beer Company, Inc.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 45,645 shares of The Boston Beer Company, Inc. (US:SAM) valued at $10,516,608 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 26,919 shares of The Boston Beer Company, Inc.. This represents a change in shares of 69.56% during the quarter. The current value of the position is $7,518,644 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 45,645 18,726 69.56 10,517 100.23 0.0105
2026-02-13 2025-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 26,919 9,284 52.65 5,253 40.88 0.0048
2025-11-13 2025-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 17,635 -15,176 -46.25 3,728 -40.45 0.0038
2025-08-13 2025-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 32,811 29,829 1,000.30 6,261 779.21 0.0071
2025-05-15 2025-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 2,982 2,982 712 0.0009
2025-02-13 2024-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 0 -20,322 -100.00 0 -100.00
2024-11-14 2024-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 20,322 -80,301 -79.80 5,876 -80.86 0.0072
2024-08-14 2024-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 100,623 -36,892 -26.83 30,695 -26.68 0.0410
2024-05-15 2024-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 137,515 108,770 378.40 41,862 321.44 0.0638
2024-02-14 2023-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 28,745 22,274 344.21 9,934 294.17 0.0168
2023-11-14 2023-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 6,471 -41,264 -86.44 2,521 -82.88 0.0051
2023-08-14 2023-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 47,735 46,887 5,529.13 14,723 5,196.04 0.0288
2023-05-15 2023-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 848 -13,355 -94.03 279 -94.06 0.0006
2023-02-14 2022-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 14,203 14,203 4,680 0.0105
2022-05-16 2022-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 0 -381 -100.00 0 -100.00
2022-02-14 2021-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 381 -23,250 -98.39 193 -98.40 0.0004
2021-11-15 2021-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 23,631 -16,892 -41.68 12,047 -70.88 0.0500
2021-08-13 2021-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 40,523 -32,621 -44.60 41,366 -53.12 0.2015
2021-05-17 2021-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 73,144 -23,779 -24.53 88,232 -8.44 0.4045
2021-02-16 2020-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 96,923 -11,945 -10.97 96,369 0.21 0.5222
2020-11-16 2020-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 108,868 -56,999 -34.36 96,170 8.04 0.6155
2020-08-13 2020-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 165,867 893 0.54 89,012 46.79 0.6236
2020-05-15 2020-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 164,974 147,943 868.67 60,638 842.32 0.6057
2020-02-14 2019-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 17,031 15,485 1,001.62 6,435 1,042.98 0.0442
2019-11-14 2019-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 1,546 -6,157 -79.93 563 -80.65 0.0044
2019-08-14 2019-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 7,703 7,703 398.25 2,910 416.87 0.0239
2017-02-10 2016-12-31 13F BOSTON BEER-A COMMON STOCK 100557107 0 -1,712 -100.00 0 -100.00
2016-11-10 2016-09-30 13F BOSTON BEER-A COMMON STOCK 100557107 1,712 1,712 266 0.0019
2016-08-12 2016-06-30 13F BOSTON BEER-A COMMON STOCK 100557107 0 -3,673 -100.00 0 -100.00
2016-05-13 2016-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 3,673 -18,879 -83.71 680 -87.68 0.0066
2014-05-14 2014-03-31 13F BOSTON BEER-A COMMON STOCK 100557107 22,552 22,552 5,519 0.1004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.