[Form 4] Ambarella, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ambarella, Inc. (symbol AMBA) has filed a Form 4 detailing a minor insider transaction by Senior Vice President, Systems, Chi-Hong Ju. On 06/17/2025 the executive sold 1,108 ordinary shares of AMBA at $52.26 per share, for gross proceeds of roughly $57.9 thousand. A single explanatory note states the shares were sold strictly to cover tax withholding obligations associated with the vesting of restricted stock units (RSUs).

After completing the sale, Mr. Ju still directly owns 171,032 ordinary shares and indirectly holds 8,000 additional shares through a foundation, leaving more than 99 % of his prior direct stake intact. The filing shows no derivative security activity and no indication that the trade occurred under a Rule 10b5-1 plan.

The sale represents less than 1 % of Mr. Ju’s direct holdings and appears routine. No operational, strategic, or earnings-related information is provided in this document, and there are no indications of broader insider sentiment shifts.

Insights

Securities Analyst

TL;DR: Routine tax-related share sale; negligible impact on AMBA valuation.

The 1,108-share disposition equates to about 0.65 % of Ju’s direct stake and just 0.004 % of Ambarella’s 25 million-share float, so market impact should be immaterial. Because the filing cites tax-withholding as the reason, it does not signal a negative view of the company’s prospects. Insider sale volume remains low, and Ju retains meaningful skin in the game with 179 k total shares. I view the disclosure as neutral for investors.

Corporate Governance Expert

TL;DR: Governance-clean, procedural Form 4; no red flags detected.

The transaction was promptly reported (within the two-business-day SEC window), includes a clear footnote, and is limited to tax withholding. No 10b5-1 plan was checked, but the modest size and reason disclosed mitigate concerns. From a governance standpoint, the filing reflects compliant insider reporting practices and presents no material risk issues.

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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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^*

Ju Chi-Hong

(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)
	Sr. Vice President, Systems

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		1,108(1)	D	$52.26	171,032	D
Ordinary Shares								8,000	I	by Foundation

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: Chi-Hong Ju	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 Chi-Hong Ju sell on 06/17/2025?

The Form 4 reports a sale of 1,108 ordinary shares.

At what price were the AMBA shares sold?

The shares were sold at $52.26 per share.

Why were the shares sold according to the filing?

They were sold to cover tax obligations arising from the vesting of restricted stock units.

How many AMBA shares does Chi-Hong Ju own after the sale?

He owns 171,032 shares directly and 8,000 shares indirectly via a foundation.

Does the filing mention any derivative security transactions?

No, no derivative securities were acquired or disposed of.