[144] AMBARELLA INC SEC Filing

Rhea-AI Filing Summary

Form 144 filed for Ambarella, Inc. (AMBA): The notice reports a proposed sale of 1,000 common shares through Morgan Stanley Smith Barney on 09/19/2025 with an aggregate market value of $84,000. The shares were acquired as performance shares on 03/15/2021. The filer, identified in related sales as Christopher Day, sold common shares on 07/14/2025 (2,907 shares), 09/08/2025 (1,772 shares), 09/17/2025 (361 shares), and 09/18/2025 (829 shares). The filing includes the standard representation that the seller is not aware of undisclosed material adverse information.

Positive

• Disclosure completeness: Form 144 includes acquisition date, nature of acquisition, broker, proposed sale date, and recent sales history.
• Acquisition transparency: Indicates securities were granted as performance shares on 03/15/2021.

Negative

• Insider selling: The filer (Christopher Day) reported multiple sales totaling 7,869 shares across 07/14/2025 to 09/18/2025, which may reduce insider ownership.
• No operational or financial context: The filing contains no company performance or reason for sales beyond standard representations.

Insights

Securities Analyst

Insider selling activity is documented but appears routine; no new company disclosures are included.

The filing documents continued disposals by an insider, Christopher Day, across multiple dates and a proposed sale of 1,000 shares on 09/19/2025 via Morgan Stanley. Sales over the past two months total meaningful share counts (7,869 shares reported). There is no accompanying financial or operational disclosure in this notice; its informational impact is limited to insider liquidity and ownership changes.

Compliance/Risk Analyst

Form 144 meets procedural requirements and includes requisite insider representation.

The form states acquisition source (performance shares dated 03/15/2021) and confirms the filer’s certification about undisclosed material information. The notice identifies broker details and the issuer’s outstanding shares count (42,689,006). From a compliance perspective, the filing appears complete for a Rule 144 sale notice; it does not allege any regulatory exceptions or waivers.

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	1000	84000.00	42689006	09/19/2025	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	03/15/2021	Performance Shares	Issuer			1000	03/15/2021	Not Applicable

* 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	09/18/2025	829	68392.50
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	09/08/2025	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 the Form 144 for AMBA report?

The form reports a proposed sale of 1,000 common shares by the filer through Morgan Stanley on 09/19/2025 with an aggregate market value of $84,000.

Who is the seller listed in the filing?

Recent sales are attributed to Christopher Day with address information provided in the filing.

When were the shares being sold originally acquired?

The 1,000 shares to be sold were acquired as performance shares on 03/15/2021 from the issuer.

How many shares has the filer sold in the past three months according to the filing?

The filer sold 2,907 (07/14/2025), 1,772 (09/08/2025), 361 (09/17/2025), and 829 (09/18/2025), totaling 7,869 shares.

What issuer-level details are included in the Form 144?

The filing lists the issuer’s number of shares outstanding as 42,689,006 and indicates the proposed sale on NASDAQ via Morgan Stanley Smith Barney LLC.