Benefit Diego Reynoso - 01 Mar 2026 Form 4 Insider Report for BOSTON BEER CO INC (SAM)

Role: CFO and Treasurer
Signature: Michael G. Andrews under POA for the benefit of Diego Reynoso
Issuer symbol: SAM
Transactions as of: 01 Mar 2026
Net transactions value: -$141,057
Form type: 4
Filing time: 03 Mar 2026, 10:06:57 UTC
Previous filing: 12 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Reynoso Diego	CFO and Treasurer	C/O THE BOSTON BEER COMPANY, INC., ONE DESIGN CENTER PLACE, SUITE 850, BOSTON	Michael G. Andrews under POA for the benefit of Diego Reynoso	03 Mar 2026	0001971267

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SAM	Class A Common	Tax liability	$141,057	-622	-2.9%	$226.78	20,642	01 Mar 2026	Direct	F1
transaction	SAM	Class A Common	Award	$0	+5,734	+28%	$0.000000	26,376	01 Mar 2026	Direct	F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SAM	October 31, 2023 Stock Option	Award	$0	+2,429	+50%	$0.000000	7,287	01 Mar 2026	Class A Common	9,717	$333.50	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The Issuer net withheld the vesting of a percentage of shares to satisfy the tax obligations of the Reporting Person flowing from the vesting of Restricted Stock Units ("RSUs"). The Reporting Person had a total of 2,116 RSUs vest on March 1, 2026.
F2	Represents grants of Restricted Stock Units ("RSUs") under the Issuer's Restated Employee Equity Incentive Plan ("EEIP"). The details of these grants were disclosed in a Current Report on Form 8-K filed by the Issuer on February 17, 2026.
F3	The shares reported include 23,097 shares of restricted stock subject to vesting conditions.
F4	The Time-Based Stock Option was granted pursuant to the Issuer's EEIP on October 31, 2023. The shares will vest in four equal installments on March 1 in the years 2024-2027 provided that the Reporting Person remains employed by the Issuer on the applicable vesting dates, and subject to accelerated vesting in certain situations.