[Form 4] AMBARELLA INC Insider Trading Activity

Rhea-AI Filing Summary

Chi-Hong Ju, Senior Vice President, Systems at Ambarella Inc (AMBA), reported a sale of 1,168 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 transaction Mr. Ju directly beneficially owns 170,087 ordinary shares and indirectly holds 8,000 shares through a foundation. The filing also notes Mr. Ju acquired 223 shares under the company’s employee stock purchase plan on 09/15/2025. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Ju on 09/19/2025.

Positive

• Substantial remaining ownership: Mr. Ju retains 170,087 shares directly and 8,000 indirectly, indicating continued alignment with shareholders
• Employee participation: Acquisition of 223 shares through the employee stock purchase plan on 09/15/2025

Negative

• Share sale occurred: Disposal of 1,168 shares on 09/17/2025 at $79.43 per share (used to pay taxes on RSU vesting)

Insights

Securities Analyst

TL;DR Insider sold a small number of shares to satisfy tax withholding after RSU vesting; substantial residual holdings remain.

The transaction is routine for executives receiving equity compensation. The sale of 1,168 shares at $79.43 to cover taxes is explicitly described as tax withholding related to RSU vesting, not a discretionary open-market sale for diversification or liquidity. Post-transaction direct ownership of 170,087 shares and indirect holding of 8,000 shares indicate continued significant alignment with shareholders. The 223 shares bought under the employee stock purchase plan increase ownership slightly and are noted separately.

Corporate Governance Expert

TL;DR Disclosure is complete for the reported transactions and indicates standard equity-compensation activity.

The Form 4 properly discloses the dates, amounts, prices, and the stated reason that shares were sold to satisfy tax obligations from RSU vesting. Indirect ownership via a foundation is disclosed. There are no unexplained or atypical transactions, and the filing is signed by an authorized attorney-in-fact, indicating customary compliance with Section 16 reporting requirements.

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^*

Ju Chi-Hong

(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)
	Sr. Vice President, Systems

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		1,168(1)	D	$79.43	170,087(2)	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.

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: Chi-Hong Ju	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 AMBA insider Chi-Hong Ju report on the Form 4?

The Form 4 reports a sale of 1,168 ordinary shares on 09/17/2025 at $79.43 per share to pay taxes from RSU vesting, plus total holdings after the sale.

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

After the transactions Mr. Ju directly beneficially owns 170,087 shares and indirectly owns 8,000 shares via a foundation.

Did Chi-Hong Ju acquire any shares recently under a company plan?

Yes, the filing notes acquisition of 223 shares under Ambarella’s employee stock purchase plan on 09/15/2025.

Why were the 1,168 shares sold according to the Form 4?

The Form 4 states the shares were sold to pay tax obligations resulting from the vesting of restricted stock units.

Who signed the Form 4 for Chi-Hong Ju?

The Form 4 was signed by /s/ Michael Morehead, Attorney-in-Fact on behalf of Chi-Hong Ju on 09/19/2025.