[Form 3] AGENUS INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Agenus Inc. filed an initial ownership report for Principal Accounting Officer Austin Charette, detailing his equity position as of January 8, 2026. He directly beneficially owns 9,115 shares of Agenus common stock and a series of employee stock options (rights to buy common stock) with various exercise prices and expiration dates. These options include grants made under the Agenus Inc. 2019 Equity Incentive Plan (as amended), with vesting schedules that provide for one third of the underlying shares to vest on a specified anniversary date and the remaining shares to vest in equal quarterly installments thereafter, generally contingent on continued employment. The filing is informational and records Charette’s current direct holdings rather than new share purchases or sales.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Charette Austin

(Last) (First) (Middle)

3 FORBES ROAD

(Street)

LEXINGTON MA 02421

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/08/2026

3. Issuer Name and Ticker or Trading Symbol
AGENUS INC [ AGEN ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Principal Accounting Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	9,115	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	08/07/2018	09/01/2027	Common Stock	337	$74.4	D
Stock Option (Right to Buy)	03/02/2019	03/02/2028	Common Stock	101	$113	D
Stock Option (Right to Buy)	01/01/2020	06/19/2029	Common Stock	237	$47.6	D
Stock Option (Right to Buy)	12/24/2020	12/24/2029	Common Stock	325	$82.4	D
Stock Option (Right to Buy)	12/17/2021	03/08/2031	Common Stock	375	$74	D
Stock Option (Right to Buy)	01/01/2023	01/01/2031	Common Stock	375	$63.6	D
Stock Option (Right to Buy)	01/02/2023	01/02/2032	Common Stock	375	$64.4	D
Stock Option (Right to Buy)	01/05/2024	01/05/2032	Common Stock	375	$49	D
Stock Option (Right to Buy)	06/27/2024	01/16/2034	Common Stock	4,843	$12.26	D
Stock Option (Right to Buy)	01/16/2025(1)	01/16/2034	Common Stock	625	$12.26	D
Stock Option (Right to Buy)	(2)	06/18/2035	Common Stock	625	$3.02	D

Explanation of Responses:

1. Options awarded in accordance with the Agenus Inc. 2019 Equity Incentive Plan (as amended), which vested as to one third of the underlying shares on January 16, 2025, and the balance in equal quarterly installments thereafter, generally subject to continued employment.

2. Options awarded in accordance with the Agenus Inc. 2019 Equity Incentive Plan (as amended) and vests over three years with one third vesting on the one-year anniversary of the grant date (May 28, 2025) and the balance in equal quarterly installments thereafter, generally subject to continued employment.

	By: /s/ Austin Charette	01/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does the Form 3 filing for Agenus (AGEN) disclose about Austin Charette?

The Form 3 discloses that Austin Charette, Principal Accounting Officer of Agenus Inc., directly beneficially owns 9,115 shares of common stock and multiple stock options to purchase additional common shares.

How many Agenus (AGEN) common shares does Austin Charette directly own?

Austin Charette directly beneficially owns 9,115 shares of Agenus common stock, reported as non-derivative securities held in direct form.

What types of derivative securities are reported in the Agenus (AGEN) Form 3?

The Form 3 reports several stock options (rights to buy Agenus common stock) with different exercisable dates, expiration dates, share amounts and exercise prices, all held directly by Austin Charette.

Under what plan were Austin Charette’s Agenus (AGEN) options granted?

Footnotes state the options were awarded under the Agenus Inc. 2019 Equity Incentive Plan (as amended), with vesting generally subject to continued employment.

How do Austin Charette’s Agenus (AGEN) stock options vest?

According to the footnotes, certain options vest as to one third of the underlying shares on a specified date, with the balance vesting in equal quarterly installments thereafter, generally contingent on continued employment.

Is the Agenus (AGEN) Form 3 an initial ownership report or a record of new trades?

This Form 3 is an initial statement of beneficial ownership, listing Austin Charette’s existing common stock and option holdings rather than reporting new purchases or sales.