[Form 4] Ambarella, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ambarella, Inc. (AMBA) – Form 4 Insider Transaction

Chief Operating Officer Chan W. Lee filed a Form 4 reporting a sale of 1,601 ordinary shares on 17 June 2025 at an average price of $52.26. The disclosure states the shares were sold to satisfy tax obligations arising from the vesting of restricted stock units (RSUs). Following the transaction, Lee’s direct ownership stands at 128,696 shares.

No derivative securities were involved and no Rule 10b5-1 trading plan was indicated in the filing. The sale represents roughly 1.2 % of Lee’s reported holdings, a level generally considered routine for tax-withholding purposes rather than a material reduction in economic exposure.

Given the modest size and stated purpose of the disposition, the filing is unlikely to materially affect Ambarella’s investment thesis or signal a strategic shift by management.

Insights

Financial Analyst

TL;DR: Small tax-related insider sale; negligible impact on AMBA outlook.

The Form 4 shows COO Chan W. Lee selling 1,601 shares (<≈1.2 % of his holdings) at $52.26 to cover RSU tax liabilities. He retains 128,696 shares, keeping a substantial stake aligned with shareholders. Because the sale is modest, explained as tax withholding, and not tied to a 10b5-1 plan, I view the transaction as neutral. It neither signals insider pessimism nor provides a positive catalyst. Investors should monitor future filings for pattern changes, but this single event is not impactful to valuation or near-term stock performance.

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^*

Lee Chan W

(Last) (First) (Middle)

3101 JAY STREET

(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)
06/17/2025

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	06/17/2025		S		1,601(1)	D	$52.26	128,696	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.

	By: /s/ Michael Morehead, Attorney-in-Fact For: Chan W. Lee	06/20/2025
	** 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

How many AMBA shares did COO Chan W. Lee sell on 06/17/2025?

He sold 1,601 ordinary shares.

At what price were the AMBA shares sold according to the Form 4?

The shares were sold at an average price of $52.26 per share.

Why did Chan W. Lee dispose of the shares?

The filing states the shares were sold to pay tax obligations arising from the vesting of RSUs.

How many AMBA shares does Lee own after the transaction?

He now directly owns 128,696 shares of Ambarella.

Does the Form 4 reference a Rule 10b5-1 trading plan?

The document includes a checkbox for Rule 10b5-1 but does not indicate it was selected.