[Form 4] Ambarella, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ambarella, Inc. (AMBA) – Form 4 insider transaction

On 06/17/2025, Christopher Day, Ambarella’s Vice President of Marketing, reported the sale of 342 ordinary shares at an average price of $52.26 per share. The shares were automatically sold to cover withholding taxes triggered by the vesting of restricted stock units, a routine administrative event disclosed in the filing. After the transaction, Day retains 15,099 shares of AMBA common stock, indicating that more than 97 % of his direct holdings remain intact. No derivative security activity was reported, and there are no indications of additional open‐market sales. Given the small size relative to both the executive’s total holdings and Ambarella’s public float, the filing is unlikely to carry material valuation implications for investors.

Insights

Securities Analyst

TL;DR: Small tax-related insider sale; negligible market impact.

This Form 4 shows a routine 342-share sale (≈2.3 % of the insider’s position) executed to satisfy RSU tax obligations. Such withholding transactions are administrative and do not signal a change in the executive’s confidence or corporate outlook. The remaining 15,099-share stake preserves substantial alignment with shareholders. Volume and dollar value (≈$18 k) are immaterial versus Ambarella’s average daily trading volume and $2 bn market cap, so I classify the disclosure as neutral for the stock.

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^*

Day Christopher

(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)
	VP, Marketing

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		342(1)	D	$52.26	15,099	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: Christopher Day	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 insider Christopher Day sell on 06/17/2025?

342 shares were sold, according to the Form 4.

What was the sale price of the AMBA shares in the Form 4 filing?

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

Why were the shares sold by Ambarella’s VP of Marketing?

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

How many AMBA shares does Christopher Day still own after the transaction?

He continues to hold 15,099 shares directly.

Does the Form 4 report any derivative security activity?

No. No options or other derivatives were acquired or disposed.