[Form 4] LITHIUM AMERICAS CORP. Insider Trading Activity

Rhea-AI Filing Summary

Lithium Americas Corp. (LAC) reported insider equity activity by its Vice President of Human Resources, Aubree Barnum. On October 24, 2025, 11,417 restricted share units (RSUs) were exercised, converting into the same number of common shares at an exercise price of $0. On November 14, 2025, 4,763 common shares were sold at $4.50 per share. After these transactions, the insider directly owned 66,373 common shares and indirectly owned 24 common shares held by a spouse. The derivative table shows 22,834 RSUs beneficially owned following the reported transactions, and the notes state that 34,251 unvested RSUs remained from a grant that vests in five equal annual installments through October 24, 2027.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BARNUM AUBREE

(Last) (First) (Middle)

C/O LITHIUM AMERICAS CORP.

5310 KIETZKE LANE, SUITE 200

(Street)

RENO NV 89511

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
LITHIUM AMERICAS CORP. [ LAC ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, Human Resources

3. Date of Earliest Transaction (Month/Day/Year)
10/24/2025

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	10/24/2025		M		11,417	A	$0	71,136	D
Common Shares								24	I	Held by spouse
Common Shares	11/14/2025		S		4,763	D	$4.5	66,373	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Units	(1)	10/24/2025		M			11,417	(2)	(1)	Common Shares	11,417	$0	22,834	D

Explanation of Responses:

1. Each restricted share unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock.

2. Represents grant of RSUs on October 24, 2023, which vest as follows: 1/5 on October 24, 2023; 1/5 on October 24, 2024; 1/5 on October 24, 2025; 1/5 on October 24, 2026; and 1/5 on October 24, 2027. As of this date of this Form3, 34,251 unvested RSUs remain.

	/s/ Tereza Fonda as attorney-in-fact for Aubree Barnum	11/18/2025
	** 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 4 (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 insider transaction did Lithium Americas (LAC) report on this Form 4?

The filing reports that VP of Human Resources Aubree Barnum exercised 11,417 restricted share units into common shares on October 24, 2025 and later sold 4,763 common shares on November 14, 2025.

At what price were Lithium Americas (LAC) shares sold in the reported transaction?

The Form 4 shows a sale of 4,763 common shares at a price of $4.50 per share on November 14, 2025.

How many Lithium Americas (LAC) shares does the insider own after the transactions?

Following the reported transactions, the insider directly owned 66,373 common shares and indirectly owned 24 common shares held by a spouse.

What restricted share unit (RSU) position does the Lithium Americas (LAC) insider report?

The derivative table indicates 22,834 RSUs beneficially owned after the transactions, and the notes state that 34,251 unvested RSUs remained from the original grant as of the form date.

When were the reported Lithium Americas (LAC) RSUs granted and how do they vest?

The RSUs were granted on October 24, 2023 and vest in five equal installments of 1/5 each year on October 24 of 2023, 2024, 2025, 2026, and 2027.

What is the relationship of the reporting person to Lithium Americas (LAC)?

The reporting person is an officer of Lithium Americas Corp., serving as Vice President, Human Resources, and the Form 4 is filed for one reporting person.