Ambarella director granted 3,151 RSUs

Independent director David Jeffrey Richardson received a time-vested RSU grant that increases his direct and family trust holdings in AMBARELLA INC.

Rhea-AI Filing Summary

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

AMBARELLA INC (AMBA) reported that independent director David Jeffrey Richardson received an annual equity award on September 8, 2026. He was granted 3,151 Ordinary Shares in the form of restricted stock units at no cash cost. The award vests in four equal installments every three months starting September 15, 2026, becoming fully vested on September 15, 2027, subject to his continued service. After this grant he holds 5,649 Ordinary Shares directly, in addition to 25,812 Ordinary Shares held indirectly by a family trust. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 3,151 shares

Grant/Award 2 txns

Insider RICHARDSON DAVID JEFFREY

Role Director

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

Holdings After Transaction: Ordinary Shares — 5,649 shares (Direct); Ordinary Shares — 25,812 shares (Indirect, by Family Trust)

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 size: 3,151 Ordinary Shares Vesting completion date: September 15, 2027 Direct holdings after grant: 5,649 Ordinary Shares +2 more

5 metrics

RSU grant size 3,151 Ordinary Shares Annual restricted stock unit grant to each independent director effective September 8, 2026

Vesting completion date September 15, 2027 RSU grant becomes fully vested on this date, subject to continued service

Direct holdings after grant 5,649 Ordinary Shares Direct ownership reported for David Jeffrey Richardson following the RSU award

Indirect family trust holdings 25,812 Ordinary Shares Indirect ownership reported as held by a family trust

Vesting schedule 1/4 every three months RSU grant vests in four equal installments after the September 15, 2026 vesting start date

Key Terms

restricted stock unit, independent director, continued service

3 terms

restricted stock unit financial

"the Board of Directors 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

"an annual restricted stock unit 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.

continued service financial

"so as to be 100% vested on September 15, 2027, subject to continued service with the Company"

FAQ

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

What equity award did AMBA director David Jeffrey Richardson receive according to this Form 4 for AMBA?

He received an annual grant of 3,151 Ordinary Shares in the form of restricted stock units on September 8, 2026, approved by the Board of Directors.

How do the RSUs granted to AMBA director Richardson vest?

The 3,151 RSUs vest as to one quarter of the Ordinary Shares every three months starting September 15, 2026, and are 100% vested on September 15, 2027, subject to continued service with the company.

What are David Jeffrey Richardson’s direct share holdings in AMBA after this transaction?

Following the RSU grant, David Jeffrey Richardson holds 5,649 Ordinary Shares directly in AMBARELLA INC.

What indirect AMBA holdings does Richardson report after this Form 4 filing?

He reports indirect ownership of 25,812 Ordinary Shares held by a family trust after the reported transactions.

Was the AMBA Form 4 transaction made under a Rule 10b5-1 trading plan?

No. The filing indicates that no Rule 10b5-1 trading plan applies to the reported RSU grant.

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^*

RICHARDSON DAVID JEFFREY

(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	5,649	D
Ordinary Shares								25,812	I	by Family Trust

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: David Jeffrey Richardson	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)