Ambarella director gets 3,151-share RSU grant

Ambarella granted a 3,151-share annual restricted stock unit award to an independent director, vesting quarterly over one year.

Rhea-AI Filing Summary

AMBARELLA INC (symbol: AMBA) is the issuer of record for a Form 4 filing submitted to the SEC. Hon Hsiao-Wuen reported acquisition or exercise transactions in this Form 4 filing.

AMBARELLA INC (AMBA) reported that director Hon Hsiao-Wuen received an annual grant of 3,151 Ordinary Shares in the form of restricted stock units effective September 8, 2026. These RSUs vest in four equal installments every three months starting September 15, 2026, becoming fully vested on September 15, 2027, subject to continued service. Following this award, the director directly holds 33,927 Ordinary Shares. No Rule 10b5-1 trading plan is reported in connection with this grant.

Insider Trade Summary

Grant/Award: 3,151 shares

Grant/Award 1 txn

Insider Hon Hsiao-Wuen

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Ordinary Shares F1	3,151	$0.00	$0.00

Holdings After Transaction: Ordinary Shares — 33,927 shares (Direct)

Footnotes (1)

1. F1. Effective as of September 8, 2026, the Board of Directors approved an annual restricted stock unit grant of 3,151 Ordinary Shares to each independent director. The RSU grant vests as to 1/4th of the Ordinary Shares each three months following the vesting start date of September 15, 2026, so as to be 100% vested on September 15, 2027, subject to continued service with the Company.

Key Figures

RSUs granted: 3,151 Ordinary Shares Exercise/award price: $0.00 per share Shares held after transaction: 33,927 Ordinary Shares +2 more

5 metrics

RSUs granted 3,151 Ordinary Shares Annual restricted stock unit grant to an independent director effective September 8, 2026

Exercise/award price $0.00 per share Equity award recorded at zero price per share in the Form 4

Shares held after transaction 33,927 Ordinary Shares Director’s direct holdings following the RSU grant

Vesting start date September 15, 2026 Start date for quarterly vesting of the RSU grant

Full vesting date September 15, 2027 Date on which the RSUs are expected to be 100% vested, subject to continued service

Key Terms

restricted stock unit, independent director, vesting start date, continued service

4 terms

restricted stock unit financial

"approved an annual restricted stock unit grant of 3,151 Ordinary Shares"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

independent director financial

"grant of 3,151 Ordinary Shares to each independent director"

An independent director is a member of a company's board of directors who is not involved in the company's day-to-day operations and has no significant relationships with the company that could influence their judgment. Their role is to provide unbiased oversight and ensure the company is managed in the best interests of all shareholders. This helps build trust and confidence among investors by promoting transparency and accountability.

vesting start date financial

"each three months following the vesting start date of September 15, 2026"

continued service financial

"100% vested on September 15, 2027, subject to continued service"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did AMBA (Ambarella Inc) disclose in this Form 4?

Ambarella disclosed that director Hon Hsiao-Wuen received an annual grant of 3,151 restricted stock units representing Ordinary Shares on September 8, 2026, approved by the Board of Directors.

How many AMBA shares does the director hold after the reported grant?

After the reported restricted stock unit grant, the director directly holds 33,927 Ordinary Shares of Ambarella Inc, according to the Form 4 data.

What are the vesting terms of the 3,151 Ambarella (AMBA) RSUs granted?

The 3,151 RSUs vest as to one-fourth of the Ordinary Shares every three months after the vesting start date of September 15, 2026, and are expected to be 100% vested on September 15, 2027, subject to continued service.

Who received the annual restricted stock unit grant from Ambarella (AMBA)?

Independent director Hon Hsiao-Wuen received the annual restricted stock unit grant of 3,151 Ordinary Shares, as approved by Ambarella’s Board of Directors effective September 8, 2026.

Was the AMBA insider equity grant made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not selected, and there is no footnote stating that the grant was made pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

Is the Ambarella (AMBA) RSU grant contingent on the director’s continued service?

Yes. The footnote states that the RSU grant will be 100% vested on September 15, 2027 and that vesting is subject to continued service with the Company.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/10/2026 - 04:48 PM Accepted by SEC EDGAR 09/10/2026 - 04:48 PM Learn about SEC filing dates

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^*

Hon Hsiao-Wuen

(Last) (First) (Middle)

3001 TASMAN DRIVE

(Street)

SANTA CLARA CALIFORNIA 95054

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/08/2026		A		3,151(1)	A	$0.0	33,927	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. Effective as of September 8, 2026, the Board of Directors approved an annual restricted stock unit grant of 3,151 Ordinary Shares to each independent director. The RSU grant vests as to 1/4th of the Ordinary Shares each three months following the vesting start date of September 15, 2026, so as to be 100% vested on September 15, 2027, subject to continued service with the Company.

	By: /s/Michael Morehead, Attorney-in-Fact, For: Hsiao-Wuan Hon	09/10/2026
	** 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.
* Form 4: SEC 1474 (03-26)