[Form 4] AMBARELLA INC Insider Trading Activity

Rhea-AI Filing Summary

Chan W. Lee, Chief Operating Officer of Ambarella, reported a sale of 1,947 ordinary shares on 09/17/2025 at a price of $79.43 per share to cover tax obligations arising from the vesting of restricted stock units. After the sale, Mr. Lee beneficially owns 126,972 shares, which includes 223 shares acquired under the company's employee stock purchase plan on 09/15/2025. The Form 4 was filed as a single reporting person filing and bears a signature by an attorney-in-fact on 09/19/2025.

Positive

• Continued significant ownership: Reporting person retains 126,972 shares following the transaction
• Employee share plan participation: 223 shares were acquired under the company's ESPP on 09/15/2025

Negative

• Disposition of shares: 1,947 ordinary shares were sold on 09/17/2025
• Sale price recorded: Shares sold at $79.43 each to cover tax obligations

Insights

Corporate Governance Expert

TL;DR: Routine tax-related sale after RSU vesting; maintains significant ownership.

The reported transaction is a common post-vesting sell-to-cover of tax liabilities and does not indicate a change in executive role or company control. Retaining 126,972 shares suggests continued alignment with shareholder interests. The filing was executed by an attorney-in-fact, which is standard practice for timely submission. No material governance concerns are evident from this single Form 4.

Securities Analyst

TL;DR: Small disposition relative to total holdings; transaction is administrative, not strategic.

The sale of 1,947 shares at $79.43 to satisfy tax obligations following RSU vesting is a routine liquidity event. The remaining beneficial ownership of 126,972 shares provides the executive with meaningful equity exposure to company performance. The inclusion of 223 ESPP shares on 09/15/2025 is a minor additive to holdings. This Form 4 contains no earnings or operational metrics.

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
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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^*

Lee Chan W

(Last) (First) (Middle)

3001 TASMAN DRIVE

(Street)

SANTA CLARA CA 95054

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AMBARELLA INC [ AMBA ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/17/2025

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
Ordinary Shares	09/17/2025		S		1,947(1)	D	$79.43	126,972(2)	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

Explanation of Responses:

1. Shares sold to pay tax obligations resulting from the vesting of restricted stock units.

2. Includes 223 shares acquired under the Company's employee stock purchase plan on September 15, 2025.

	By: /s/ Michael Morehead, Attorney-in-Fact For: Chan W. Lee	09/19/2025
	** 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 did Ambarella (AMBA) executive Chan W. Lee do on 09/17/2025?

He sold 1,947 ordinary shares on 09/17/2025 at $79.43 per share to pay tax obligations from RSU vesting.

How many Ambarella shares does Chan W. Lee beneficially own after the reported transaction?

He beneficially owns 126,972 shares following the reported transaction.

Were any shares acquired by Chan W. Lee shortly before the sale?

Yes. The filing notes 223 shares were acquired under the company's employee stock purchase plan on 09/15/2025.

Why were shares sold according to the Form 4?

The filing explains the 1,947 shares were sold to pay tax obligations resulting from the vesting of restricted stock units.

Who filed and signed the Form 4 for Chan W. Lee?

The Form 4 was filed by one reporting person and executed by an attorney-in-fact, Michael Morehead, with a signature date of 09/19/2025.