Welcome to our dedicated page for Ambarella SEC filings (Ticker: AMBA), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Ambarella Inc (NASDAQ:AMBA) files quarterly and annual reports with the SEC that detail semiconductor revenue trends, research spending, and customer concentration risks. For a fabless chip company, these filings reveal critical dependencies on foundry partners, exposure to specific customer segments, and the capital allocation between product development and operations.
The company's 10-K annual reports break down revenue by geographic region and end market, showing which sectors—security cameras, automotive, or consumer devices—drive chip sales. Ambarella's 10-Q quarterly filings track how seasonal patterns and product cycles affect semiconductor demand. The company's filings also disclose customer concentration, identifying when a significant portion of revenue depends on a small number of large customers, which carries implications for revenue stability.
Form 4 filings document insider transactions, showing when executives and directors buy or sell Ambarella shares. These transactions occur within trading windows following earnings announcements and may reflect insider perspectives on company performance. The company's DEF 14A proxy statements detail executive compensation structures, revealing how stock-based compensation aligns management incentives with shareholder interests in the competitive semiconductor employment market.
Material events disclosed in 8-K filings include earnings announcements, significant customer agreements, and changes in foundry relationships. Our AI-powered summaries extract key financial metrics from dense accounting disclosures, highlighting revenue trends, gross margin changes, and research spending patterns. Access Ambarella's complete filing history to analyze the company's financial trajectory and strategic disclosures.
Leslie Kohn, Chief Technology Officer and director of Ambarella, reported a small sale of company stock on 09/17/2025. The filing shows 2,249 ordinary shares were sold at $79.43 per share under transaction code S, with the stated purpose that the shares were sold to pay tax obligations arising from restricted stock unit vesting.
After the sale, the filing reports 977,428 shares beneficially owned by Kohn. The transaction appears routine and limited in size relative to the reported holdings.
Chi-Hong Ju, Senior Vice President, Systems at Ambarella Inc (AMBA), reported a sale of 1,168 ordinary shares on 09/17/2025 at a price of $79.43 per share to cover tax obligations arising from the vesting of restricted stock units. After the transaction Mr. Ju directly beneficially owns 170,087 ordinary shares and indirectly holds 8,000 shares through a foundation. The filing also notes Mr. Ju acquired 223 shares under the company’s employee stock purchase plan on 09/15/2025. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Ju on 09/19/2025.
Filing snapshot: AMBARELLA INC director and CEO Feng-Ming Wang reported a sale of 4,928 ordinary shares on 09/17/2025 at $79.43 per share. The filing states the sale was to pay tax obligations arising from the vesting of restricted stock units. After the transaction, Mr. Wang beneficially owned 788,929 shares, which the filing notes includes 223 shares purchased under the companys employee stock purchase plan on 09/15/2025.
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.
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.
Ambarella, Inc. (AMBA) Form 144 notice reports a proposed sale of 8,492 shares of Ambarella common stock through Morgan Stanley Smith Barney LLC. The filer acquired these shares as restricted stock on 06/15/2019. The planned approximate sale date is 09/10/2025 on the NASDAQ, with an aggregate market value reported at $716,894.64. The filing lists 42,689,006 shares outstanding, and indicates no related sales in the past three months. The notice includes the standard representation that the seller is unaware of any undisclosed material adverse information and a signature declaration regarding the accuracy of the notice.
Ambarella, Inc. (AMBA) filed a Form 144 reporting proposed insider sales of common stock. The filing notifies a brokered sale of 1,772 shares with an aggregate market value of $150,620, to be executed approximately on 09/08/2025 on NASDAQ. The seller previously acquired 1,463 restricted shares on 03/15/2021 and 309 restricted shares on 06/15/2022. The filing also discloses two recent open-market sales by the same person: 2,907 shares on 07/14/2025 for $194,289.32 and 342 shares on 06/17/2025 for $17,872.10. The notice includes the signer’s representation that no undisclosed material adverse information is known.
Ambarella, Inc. director Chantelle Y. Breithaupt received an annual grant of 2,498 restricted stock units (RSUs). The grant, approved by the board and effective September 2, 2025, vests in four equal quarterly installments beginning September 15, 2025, and becomes fully vested on September 15, 2026, subject to continued service. After the reported acquisition, Ms. Breithaupt beneficially owned 4,940 ordinary shares. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person on September 4, 2025.
Ambarella director Elizabeth M. Schwarting received an annual restricted stock unit (RSU) award of 2,498 ordinary shares approved by the board, reported as a transaction dated 09/02/2025. The grant has a vesting schedule that vests one-fourth every three months beginning with a vesting start date of 09/15/2025 and becomes fully vested on 09/15/2026, subject to continued service. The Form 4 shows Schwarting beneficially owns 9,978 shares following the grant and the reported price for the award is listed as $0.0, consistent with an equity grant rather than a purchase.
Ambarella, Inc. director Hsiao-Wuen Hon received an annual restricted stock unit (RSU) award of 2,498 ordinary shares, effective September 2, 2025. The filing shows the grant was approved by the Board and reported on Form 4, with 30,776 shares reported as beneficially owned by Mr. Hon after the award. The RSUs vest in four quarterly installments beginning September 15, 2025, with 1/4th of the shares vesting each three months and full vesting on September 15, 2026, subject to continued service. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.
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