Ambarella COO sells 2,893 shares at $64.83

Ambarella’s chief operations officer sold a small block of shares primarily to cover tax obligations from RSU vesting, retaining over 150,000 shares afterward.

Rhea-AI Filing Summary

AMBARELLA INC (AMBA) reported that Chief Operations Officer Lee Chan W sold ordinary shares of the company on September 17, 2026. The transaction involved the sale of 2,893 ordinary shares at a price of $64.83 per share, described as shares sold to pay tax obligations arising from the vesting of restricted stock units. Following this transaction, Lee Chan W held 154,443 ordinary shares directly, which includes 238 shares acquired under the company’s employee stock purchase plan on September 15, 2026. No Rule 10b5-1 trading plan is reported for this sale.

Insider Trade Summary

Net Seller: 2,893 shares

Net Sell 1 txn

Insider Lee Chan W

Role Chief Operations Officer

Sold 2,893 shs ($188K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F2	2,893	$64.83	$188K

Holdings After Transaction: Ordinary Shares — 154,443 shares (Direct)

Footnotes (2)

1. F1. Shares sold to pay tax obligations resulting from the vesting of restricted stock units.
2. F2. Includes 238 shares acquired under the Company's employee stock purchase plan on September 15, 2026.

Key Figures

Shares sold: 2,893 shares Sale price per share: $64.83 per share Shares held after transaction: 154,443 shares +1 more

4 metrics

Shares sold 2,893 shares Ordinary shares sold by the Chief Operations Officer on September 17, 2026

Sale price per share $64.83 per share Price received for each ordinary share sold on September 17, 2026

Shares held after transaction 154,443 shares Direct ownership by the Chief Operations Officer following the September 17, 2026 sale

ESPP shares included in holdings 238 shares Shares acquired under the employee stock purchase plan on September 15, 2026, included in post-transaction total

Key Terms

restricted stock units, employee stock purchase plan, open market or private transaction

3 terms

restricted stock units financial

"Shares sold to pay tax obligations resulting from the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

employee stock purchase plan financial

"Includes 238 shares acquired under the Company's employee stock purchase plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

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

What insider transaction did AMBA’s Chief Operations Officer report on this Form 4?

The Chief Operations Officer, Lee Chan W, reported a sale of 2,893 ordinary shares of Ambarella Inc. on September 17, 2026, in a transaction classified as a sale in the open market or a private transaction.

At what price were the AMBA shares sold in the reported insider transaction?

The 2,893 Ambarella Inc. shares were sold at a price of $64.83 per share. The filing classifies this as a sale in the open market or a private transaction, and the price is reported on a per-share basis.

Why did the AMBA insider sell 2,893 shares according to the Form 4 footnotes?

The footnote states that the 2,893 shares were sold to pay tax obligations resulting from the vesting of restricted stock units, indicating the transaction was related to equity award tax settlement rather than a discretionary portfolio sale.

How many AMBA shares does the Chief Operations Officer hold after this transaction?

After the sale, the Chief Operations Officer directly held 154,443 ordinary shares of Ambarella Inc. This post-transaction amount includes 238 shares acquired under the company’s employee stock purchase plan on September 15, 2026.

Did the AMBA insider use a Rule 10b5-1 trading plan for this stock sale?

No. The filing indicates that the Rule 10b5-1 checkbox is not marked, and there is no footnote stating that the September 17, 2026 sale was made under a Rule 10b5-1 or pre-arranged trading plan.

What additional share activity did the AMBA insider report around the same period?

A footnote states that the post-transaction holdings of 154,443 shares include 238 shares that were acquired under the company’s employee stock purchase plan on September 15, 2026, shortly before the reported sale.

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

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Available on EDGAR 09/18/2026 - 04:51 PM Accepted by SEC EDGAR 09/18/2026 - 04:50 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^*

Lee Chan W

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/17/2026

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	09/17/2026		S		2,893(1)	D	$64.83	154,443(2)	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.

2. Includes 238 shares acquired under the Company's employee stock purchase plan on September 15, 2026.

	By: /s/Michael Morehead, Attorney-in-Fact, For: Chan W. Lee	09/18/2026
	** 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)