[144] AMBARELLA INC SEC Filing

Rhea-AI Filing Summary

Form 144 notice: An insider filing indicates proposed and recent sales of Ambarella Inc. common stock under Rule 144. The notice lists a proposed sale of 829 shares through Morgan Stanley Smith Barney on 09/18/2025 on NASDAQ with an aggregate market value of $68,392.50. Acquisition data show 611 shares received as restricted stock on 09/15/2025 and 218 shares purchased via an Employee Stock Purchase Plan on 03/15/2024. Recent sales by the filer, Christopher Day at the Santa Clara address, total 5,551 shares across four transactions from 07/14/2025 to 09/17/2025 with gross proceeds reported.

Insights

Securities Analyst

TL;DR: Routine Rule 144 insider sale notice showing modest insider dispositions across recent months.

The filing documents a proposed sale of 829 shares and prior insider sales totaling 5,551 shares between July and September 2025. The broker identified is Morgan Stanley Smith Barney and the trades are on NASDAQ. The acquisitions include restricted stock and ESPP purchases, which explains the mix of acquisition dates and payment types. This filing is procedural disclosure of insider sales rather than an operational update.

Compliance/Risk Analyst

TL;DR: Disclosure appears compliant with Rule 144 requirements; no material adverse information reported.

The signer affirms no undisclosed material adverse information and provides acquisition and payment details for the securities being sold. Dates and nature of acquisitions (restricted stock and ESPP) are provided, and recent sales list gross proceeds. The filing contains standard attestations and broker information, consistent with routine insider reporting obligations.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	829	68392.50	42689006	09/18/2025	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	09/15/2025	Restricted Stock	Issuer			611	09/15/2025	Not Applicable
Common	03/15/2024	Employee Stock Purchase Plan	Issuer			218	03/15/2024	Cash

* 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
CHRISTOPHER DAY 3001 Tasman Drive Santa Clara CA 95054	Common	09/17/2025	361	28672.93
CHRISTOPHER DAY 3001 Tasman Drive Santa Clara CA 95054	Common	09/15/2025	611	50407.50
CHRISTOPHER DAY 3001 Tasman Drive Santa Clara CA 95054	Common	09/08/2025	1772	150620.00
CHRISTOPHER DAY 3001 Tasman Drive Santa Clara CA 95054	Common	07/14/2025	2907	194289.32

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Ambarella Inc (AMBA) Form 144 disclose about proposed sales?

The filing discloses a proposed sale of 829 common shares through Morgan Stanley Smith Barney on 09/18/2025 for an aggregate market value of $68,392.50 on NASDAQ.

Who is the filer and how many shares has the filer sold recently?

The seller is listed as Christopher Day and recent sales from 07/14/2025 to 09/17/2025 total 5,551 shares across four transactions.

What types of acquisitions are reported for the shares to be sold?

The filing shows shares acquired as restricted stock on 09/15/2025 (611 shares) and via an Employee Stock Purchase Plan on 03/15/2024 (218 shares).

On which exchange will the proposed sale occur and who is the broker?

The proposed sale is reported to take place on NASDAQ and the broker is Morgan Stanley Smith Barney LLC.

Does the filer assert any undisclosed material information about Ambarella?

The filer represents by signing the notice that they do not know any material adverse information regarding the issuer that has not been publicly disclosed.