Ambarella SVP sells 2,009 shares at $64.83

Ambarella’s Senior VP, Systems & GM sold shares to cover RSU tax obligations while retaining significant direct and indirect holdings.

Rhea-AI Filing Summary

AMBARELLA INC (AMBA) reported that Senior VP, Systems & GM Ju Chi-Hong sold 2,009 Ordinary Shares on September 17, 2026 at $64.83 per share in a transaction described as covering tax obligations from the vesting of restricted stock units. Following this sale, he directly holds 154,153 Ordinary Shares, which include 238 shares acquired under the company’s employee stock purchase plan on September 15, 2026. In addition, 8,000 Ordinary Shares are held indirectly by a foundation. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

Net Seller: 2,009 shares

Net Sell 2 txns

Insider Ju Chi-Hong

Role Senior VP, Systems & GM

Sold 2,009 shs ($130K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F2	2,009	$64.83	$130K
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Ordinary Shares — 154,153 shares (Direct); Ordinary Shares — 8,000 shares (Indirect, by Foundation)

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: 2,009 Ordinary Shares Sale price per share: $64.83 per share Direct holdings after transaction: 154,153 Ordinary Shares +2 more

5 metrics

Shares sold 2,009 Ordinary Shares Sale reported for September 17, 2026

Sale price per share $64.83 per share Price for 2,009 Ordinary Shares sold on September 17, 2026

Direct holdings after transaction 154,153 Ordinary Shares Direct ownership reported following the September 17, 2026 sale

Indirect holdings by foundation 8,000 Ordinary Shares Indirect ownership classified as held by a foundation

Shares acquired under ESPP 238 Ordinary Shares Included in direct holdings from employee stock purchase plan on September 15, 2026

Key Terms

restricted stock units, employee stock purchase plan, indirect ownership

3 terms

restricted stock units financial

"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

"acquired under the Company's employee stock purchase plan on September 15, 2026"

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.

indirect ownership financial

"8,000 Ordinary Shares are reported as indirectly owned by a foundation"

FAQ

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

What insider transaction did AMBA’s Senior VP report on this Form 4?

Senior VP, Systems & GM Ju Chi-Hong reported a sale of 2,009 Ordinary Shares of Ambarella Inc. on September 17, 2026 at $64.83 per share, described as a sale to cover tax obligations from the vesting of restricted stock units.

How many AMBA shares does Ju Chi-Hong hold after the reported transaction?

After the transaction, Ju Chi-Hong directly holds 154,153 Ordinary Shares of Ambarella Inc. and indirectly holds 8,000 Ordinary Shares through a foundation, as reported in the Form 4.

What was the purpose of the AMBA share sale reported by Ju Chi-Hong?

The Form 4 states that the 2,009 shares were sold to pay tax obligations arising from the vesting of restricted stock units, indicating a tax-related sale rather than a discretionary portfolio trade.

Were any AMBA shares acquired by Ju Chi-Hong around the time of this filing?

Yes. The filing notes that his direct holdings include 238 shares acquired under the company’s employee stock purchase plan on September 15, 2026.

Does this AMBA Form 4 indicate trades under a Rule 10b5-1 plan?

No. The document-level checkbox for Rule 10b5-1 plans is not marked, and there is no footnote stating the transactions were made pursuant to a trading plan, so no Rule 10b5-1 plan is reported.

How are Ju Chi-Hong’s indirect AMBA holdings structured?

The Form 4 reports 8,000 Ordinary Shares held indirectly by a foundation. These are classified as indirect ownership, separate from his 154,153 directly held shares.

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^*

Ju Chi-Hong

(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)
	Senior VP, Systems & GM

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		2,009(1)	D	$64.83	154,153(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 238 shares acquired under the Company's employee stock purchase plan on September 15, 2026.

	By: /s/Michael Morehead, Attorney-in-Fact, For: Chi-Hong Ju	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)