Ambarella director gets 3,151-share RSU grant

Ambarella granted director Chenming Hu 3,151 RSU-based Ordinary Shares that vest quarterly from September 2026 to September 2027.

Rhea-AI Filing Summary

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

AMBARELLA INC (AMBA) reported that director Chenming Hu received an annual equity award in the form of 3,151 Ordinary Shares as a restricted stock unit (RSU) grant effective September 8, 2026. Following this grant, Hu directly holds 32,667 Ordinary Shares.

The RSU award vests in four equal installments every three months starting from a vesting start date of September 15, 2026, becoming fully vested on September 15, 2027, subject to Hu’s continued service with the company.

Insider Trade Summary

Grant/Award: 3,151 shares

Grant/Award 1 txn

Insider Hu Chenming

Role Director

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

Holdings After Transaction: Ordinary Shares — 32,667 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

RSU grant shares: 3,151 shares Price per share for grant: $0.00 per share Shares owned after transaction: 32,667 shares +3 more

6 metrics

RSU grant shares 3,151 shares Annual restricted stock unit grant effective September 8, 2026

Price per share for grant $0.00 per share Reported acquisition price for 3,151 Ordinary Shares awarded to director

Shares owned after transaction 32,667 shares Chenming Hu’s direct holdings following the RSU grant

Vesting start date September 15, 2026 RSU grant vests quarterly beginning on this date

Full vesting date September 15, 2027 RSU grant becomes 100% vested on this date, subject to continued service

Number of vesting installments 4 installments RSU vests as to one-quarter of the shares each three months

Key Terms

restricted stock unit, vesting start date, independent director

3 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.

vesting start date financial

"following the vesting start date of September 15, 2026"

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.

FAQ

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

What insider transaction did AMBA director Chenming Hu report on this Form 4 for AMBA?

Chenming Hu reported an equity award of 3,151 Ordinary Shares in the form of restricted stock units, effective September 8, 2026. The shares were acquired at a reported price of $0.00 per share as part of director compensation.

How does this RSU grant affect Chenming Hu’s total AMBA shares?

After the reported grant of 3,151 Ordinary Shares, Chenming Hu directly holds 32,667 Ordinary Shares of Ambarella Inc. This reflects his updated direct ownership position following the director equity award.

What is the vesting schedule of the 3,151-share RSU grant at AMBA?

The RSU grant of 3,151 Ordinary Shares vests as to one-quarter every three months after the vesting start date of September 15, 2026, and is expected to be 100% vested by September 15, 2027, subject to continued service.

Was the AMBA RSU grant to Chenming Hu made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates no Rule 10b5-1 trading plan for this transaction, meaning the grant is reported as a standard director equity award rather than under a pre-arranged trading plan.

What type of security did AMBA grant to director Chenming Hu?

Ambarella granted Chenming Hu restricted stock units (RSUs) representing 3,151 Ordinary Shares. These RSUs convert into Ordinary Shares as they vest over the one-year vesting period ending on September 15, 2027.

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

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Available on EDGAR 09/10/2026 - 05:37 PM Accepted by SEC EDGAR 09/10/2026 - 05:36 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^*

Hu Chenming

(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	32,667	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: Chenming Hu	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)