LAC VP exercises 15,673 RSUs, 17,278 shares withheld

Lithium Americas Corp. VP, Human Resources Aubree Barnum exercised 15,673 Restricted Share Units into an equal number of common shares on April 10, 2026.

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Form Type

Rhea-AI Filing Summary

Lithium Americas Corp. VP, Human Resources Aubree Barnum exercised 15,673 Restricted Share Units into an equal number of common shares on April 10, 2026. After this derivative exercise, a separate transaction withheld 17,278 common shares at $4.17 per share to cover tax obligations, reducing open-market impact. Barnum now directly holds 99,094 common shares and indirectly holds 24 common shares through a spouse. Footnotes explain that each RSU converts into one common share and reference a 47,020‑RSU grant made on April 10, 2025 that vests in thirds beginning in 2026.

Insider Trade Summary

15,673 shares exercised/converted

Exercise 4 txns

Insider BARNUM AUBREE

Role VP, Human Resources

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units	15,673	$0.00	$0.00
Exercise	Common Shares	15,673	$0.00	$0.00
Exercise Price or Tax Liability	Common Shares	17,278	$4.17	$72K
holding	Common Shares	--	--	--

Holdings After Transaction: Restricted Share Units — 31,347 contracts (Direct); Common Shares — 99,094 shares (Direct); Common Shares — 24 shares (Indirect, Held by spouse)

Footnotes (2)

F1. Each restricted share unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock.
F2. Represents grant of 47,020 RSUs on April 10, 2025, which vests 1/3 annually beginning in 2026.

Key Figures

RSUs exercised: 15,673 units Shares withheld for taxes: 17,278 shares Tax withholding price: $4.17 per share +4 more

7 metrics

RSUs exercised 15,673 units Restricted Share Units converted to common shares on April 10, 2026

Shares withheld for taxes 17,278 shares Common shares disposed at $4.17 per share for tax withholding

Tax withholding price $4.17 per share Price used for 17,278-share tax-withholding disposition

Direct common shares after transactions 99,094 shares Direct LAC common share holdings following April 10, 2026 transactions

Indirect common shares via spouse 24 shares Indirect holdings categorized as held by spouse

Prior direct common share balance 116,372 shares Direct holdings after RSU exercise, before tax-withholding disposition

RSU grant referenced in footnote 47,020 RSUs Grant on April 10, 2025, vesting one-third annually starting in 2026

Key Terms

Restricted Share Units, derivative exercise/conversion, tax-withholding disposition, contingent right, +1 more

5 terms

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

contingent right financial

"represents a contingent right to receive one share of the Issuer's common stock"

Held by spouse financial

"nature_of_ownership": "Held by spouse""

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did LAC VP Aubree Barnum report on this Form 4?

Aubree Barnum reported exercising 15,673 Restricted Share Units into 15,673 Lithium Americas common shares. A related tax-withholding transaction then disposed of 17,278 common shares. The filing updates total direct and indirect holdings after these compensation-related equity events.

How many Lithium Americas (LAC) shares does Aubree Barnum hold after the transactions?

After the reported transactions, Aubree Barnum directly holds 99,094 Lithium Americas common shares. The filing also shows an additional 24 common shares held indirectly through a spouse, reflecting combined exposure after the RSU exercise and tax-withholding share disposition.

What was the size of the RSU exercise reported by LAC VP Aubree Barnum?

Barnum exercised 15,673 Restricted Share Units, each converting into one Lithium Americas common share. This derivative exercise increased direct common share holdings before a subsequent tax-withholding share disposition adjusted the net position reported in the same Form 4 filing.

How many LAC shares were withheld for taxes in the Form 4 filing?

The filing reports 17,278 Lithium Americas common shares disposed of at $4.17 per share for tax withholding. This F-code transaction reflects shares delivered to satisfy tax obligations, rather than an open-market sale initiated for investment or trading purposes.

What do the RSU footnotes in Aubree Barnum’s LAC Form 4 explain?

The footnotes explain each Restricted Share Unit represents a contingent right to receive one common share. They also note a grant of 47,020 RSUs on April 10, 2025, vesting one-third annually starting in 2026, outlining the longer-term equity compensation structure.

Are the transactions in this LAC Form 4 open-market buys or sells?

No open-market buys or sells are reported. The Form 4 shows a derivative exercise of 15,673 RSUs into common shares and a tax-withholding disposition of 17,278 shares, which are compensation and tax events rather than discretionary market trades.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 04/14/2026 - 07:59 PM EDT

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

NEVADA

89511

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/10/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Shares	04/10/2026		M		15,673	A	⁽¹⁾	116,372	D
Common Shares	04/10/2026		F		17,278	D	$4.17	99,094	D
Common Shares								24	I	Held by spouse

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Units	⁽¹⁾	04/10/2026		M			15,673	⁽²⁾	⁽²⁾	Common Shares	15,673	$0	31,347	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 47,020 RSUs on April 10, 2025, which vests 1/3 annually beginning in 2026.

	/s/ Tereza Fonda as attorney-in-fact for Aubree Barnum	04/14/2026
	** 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 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR