Ouster officer plans $361K stock sale for taxes

An Ouster, Inc. officer filed a Rule 144 notice to sell vested RSU shares mainly to cover tax withholding obligations.

Rhea-AI Filing Summary

Ouster, Inc. (OUST) has an officer, Cyrille Jacquemet, filing a Rule 144 notice to sell 9,642 shares of Common Stock through E*TRADE Financial Corporation, with an aggregate market value of $361,478.58 and based on 72,112,333 shares outstanding as of September 11, 2026. The shares relate to restricted stock units granted under an incentive award plan, including blocks of 13,333 and 3,459 RSUs that vested for services rendered, and are to be sold to cover withholding taxes upon vesting. The notice also reports a prior sale of 8,723 shares on June 12, 2026 for $338,653.03.

Key Figures

Shares to be sold: 9,642 shares Aggregate market value of planned sale: $361,478.58 Shares outstanding: 72,112,333 shares +4 more

7 metrics

Shares to be sold 9,642 shares Planned sale of Ouster common stock under Rule 144 as of September 11, 2026

Aggregate market value of planned sale $361,478.58 Value of 9,642 shares of Ouster common stock under the Rule 144 notice

Shares outstanding 72,112,333 shares Ouster common stock outstanding referenced in the securities information section

RSUs vested March 21, 2025 13,333 units Restricted stock units awarded under incentive award plan for services rendered

RSUs vested April 11, 2026 3,459 units Restricted stock units awarded under incentive award plan for services rendered

Recent shares sold 8,723 shares Ouster common stock sold on June 12, 2026 by the same officer

Value of recent sale $338,653.03 Total proceeds from 8,723 shares sold on June 12, 2026

Key Terms

Rule 144, restricted stock units, incentive award plan, withholding taxes

4 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

"Restricted stock units awarded under incentive award plan"

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.

incentive award plan financial

"Restricted stock units awarded under incentive award plan"

An incentive award plan is a formal program that rewards employees, executives, or directors with cash, stock, options, or other pay when the company meets set goals or performance targets. Like a sales commission or a loyalty program that pays out when you hit milestones, it’s designed to align staff behavior with company objectives; investors care because it affects a company’s costs, share count (dilution), leadership incentives, and long-term value creation.

withholding taxes financial

"Shares are to be sold to cover withholding taxes upon vesting"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

FAQ

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

What does the Form 144 filing disclose for OUST (Ouster, Inc.)?

It discloses that officer Cyrille Jacquemet filed a Rule 144 notice to sell 9,642 shares of Ouster common stock, derived from vested restricted stock units, primarily to cover withholding taxes upon vesting of those RSUs.

How many Ouster (OUST) shares are planned to be sold under this Form 144?

The notice states that 9,642 shares of Ouster common stock are planned to be sold through E*TRADE Financial Corporation, with an aggregate market value of $361,478.58 as of September 11, 2026.

What is the source of the OUST shares being sold under Rule 144?

The shares come from restricted stock units granted under an incentive award plan, including 13,333 RSUs vested on March 21, 2025 and 3,459 RSUs vested on April 11, 2026, both for services rendered.

Why is the Ouster (OUST) officer selling these shares?

The remarks state that the shares are to be sold to cover withholding taxes upon vesting of the restricted stock units. This indicates the sale is related to tax obligations on equity compensation rather than a discretionary large open-market sale.

Were there recent OUST share sales by the same officer before this notice?

Yes. The Form 144 reports that Cyrille Jacquemet sold 8,723 shares of Ouster common stock on June 12, 2026 for a total value of $338,653.03 within the past three months.

How many Ouster (OUST) shares were outstanding in this Form 144?

The filing lists 72,112,333 shares outstanding of Ouster common stock as part of the securities information related to the planned sale dated September 11, 2026.

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

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Available on EDGAR 09/11/2026 - 09:08 PM Accepted by SEC EDGAR 09/11/2026 - 09:07 PM Learn about SEC filing dates

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	0002117981
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	Ouster, Inc.
SEC File Number	001-39463
Address of Issuer	350 TREAT AVENUE SAN FRANCISCO CALIFORNIA 94110
Phone	(415) 987-6972
Name of Person for Whose Account the Securities are To Be Sold	Jacquemet Cyrille
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 Stock	ETRADE FINANCIAL CORPORATION 3 EDISON DRIVE ALPHARETTA GA 30005	9642	361478.58	72112333	09/11/2026	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 Stock	09/11/2026	Restricted stock units awarded under incentive award plan	Issuer			13333	03/21/2025	Services rendered
Common Stock	09/11/2026	Restricted stock units awarded under incentive award plan	Issuer			3459	04/11/2026	Services rendered

* 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
Cyrille Jacquemet 350 TREAT AVENUE SAN FRANCISCO CA 94110	Common Stock	06/12/2026	8723	338653.03

144: Remarks and Signature

Remarks	Shares are to be sold to cover withholding taxes upon vesting of restricted stock units.
Date of Notice	09/11/2026
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/ Megan Chung, as Attorney-in-Fact for Cyrille Jacquemet
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)