Ambarella officer plans sale of 1,896 shares

Officer John Young filed a Rule 144 notice to sell 1,896 AMBARELLA shares, following sales of 3,126 shares in the prior three months.

Available on EDGAR 09/18/2026 - 04:19 PM EDT Accepted by SEC EDGAR 09/18/2026 - 04:19 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

AMBARELLA, INC. (AMBA) received a Rule 144 notice from officer John Young covering a proposed sale of 1,896 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on NASDAQ.

The shares relate to Restricted Stock Units with a date of September 15, 2026, and the notice lists an aggregate market value of $126,861.36. The filing also reports that Young sold 3,126 shares of common stock during the prior three months for $202,669.21.

Key Figures

Shares proposed for sale: 1,896 shares Aggregate market value of proposed sale: $126,861.36 Shares sold in prior three months: 3,126 shares +2 more

5 metrics

Shares proposed for sale 1,896 shares Common stock covered by John Young's Rule 144 notice

Aggregate market value of proposed sale $126,861.36 Value listed for 1,896 shares in the Rule 144 filing

Shares sold in prior three months 3,126 shares Common stock sold by John Young on September 17, 2026

Proceeds from prior three-month sales $202,669.21 Total consideration for 3,126 shares sold on September 17, 2026

RSU date September 15, 2026 Date associated with the Restricted Stock Units underlying the shares

Key Terms

Rule 144, Restricted Stock Units, aggregate market value

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Units financial

"Common | 09/15/2026 | Restricted Stock Units | Issuer"

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.

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services ... | 126861.36"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does the Form 144 filing disclose for AMBA (AMBARELLA, INC.)?

It discloses that officer John Young filed a Rule 144 notice covering a proposed sale of 1,896 shares of AMBARELLA common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on NASDAQ.

How many AMBARELLA (AMBA) shares are covered by John Young's planned sale?

The notice covers a proposed sale of 1,896 shares of AMBARELLA common stock, with an associated aggregate market value of $126,861.36 listed in the filing.

What is the source of the AMBARELLA (AMBA) shares John Young plans to sell?

The shares are tied to Restricted Stock Units with a date of September 15, 2026, and the issuer is listed as AMBARELLA, INC.

Which broker is handling John Young's proposed AMBA (AMBA) share sale?

The proposed sale of 1,896 shares is to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

What AMBARELLA (AMBA) stock sales has John Young made in the past three months?

In the prior three months, John Young is reported to have sold 3,126 shares of AMBARELLA common stock on September 17, 2026 for total proceeds of $202,669.21.

When was the Form 144 for AMBARELLA (AMBA) signed by John Young?

The Form 144 notice was signed by John Young on September 18, 2026, as indicated by the signature line in the filing.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002009866
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	AMBARELLA, INC.
SEC File Number	001-35667
Address of Issuer	3001 Tasman Drive Santa Clara CALIFORNIA 95054
Phone	4087348888
Name of Person for Whose Account the Securities are To Be Sold	JOHN YOUNG
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	1896	126861.36	44140971	09/18/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/15/2026	Restricted Stock Units	Issuer			1896	09/15/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
JOHN YOUNG 3001 Tasman Drive Santa Clara CA 95054	Common	09/17/2026	3126	202669.21

144: Remarks and Signature

Remarks
Date of Notice	09/18/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	01/15/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ John Young
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)