[144] Ouster, Inc. SEC Filing

Rhea-AI Filing Summary

A filer submitted a notice reporting intended sales of restricted common stock under Rule 144. The filing lists planned dispositions tied to restricted stock vesting on 07/17/2020 and 09/22/2020, with reported share entries of 1,735, 3,470, and 4,111. The filing shows the date 05/21/2026 and references NASDAQ.

Insights

Securities Compliance Specialist

Form 144 notice lists intended sales of restricted common stock; procedural compliance document.

The filing lists multiple restricted stock vesting entries with share counts of 1,735, 3,470, and 4,111, and a filing date of 05/21/2026. This document is a required notice under resale rules rather than a completed open‑market trade.

Timing and execution method are not detailed in the excerpt; subsequent transaction reports would show whether sales occurred and the actual proceeds.

Corporate Governance Analyst

Routine insider resale notice tied to vested restricted shares; not a material corporate event.

The entries are described as "Restricted stock vesting under a registered plan" with listed vesting dates 07/17/2020 and 09/22/2020. The broker/agent line references Morgan Stanley Smith Barney LLC.

Because this is a filing of intent, not a confirmation of sale, material impact depends on whether and how the shares are sold; follow-up Form 4/144 updates would provide execution details.

FAQ

What does this Form 144 filing for OUST indicate?

It indicates an intention to sell restricted common shares under resale rules. The filing lists planned dispositions of 1,735, 3,470, and 4,111 shares tied to vesting dates and shows 05/21/2026.

Are these sales completed transactions for OUST?

No. This filing reports an intent to sell restricted shares under Rule 144. Execution details and proceeds are not shown; completed trades would appear in later transaction reports.

Which shares are described in the filing for OUST?

The filing describes common stock from "Restricted stock vesting under a registered plan" with vesting dates 07/17/2020 and 09/22/2020 and the listed share counts above.

Who is listed as the broker or agent in this filing?

The filing references Morgan Stanley Smith Barney LLC at 1 New York Plaza, suggesting that broker‑dealer details were provided for the intended resale arrangement.

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

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Accepted by SEC EDGAR 05/21/2026 - 04:16 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	0001334330
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) 949-0108
Name of Person for Whose Account the Securities are To Be Sold	SUSAN HEYSTEE
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	Director

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	9316	324243.38	63672949	05/21/2026	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	07/17/2020	Restricted stock vesting under a registered plan	Issuer			1735	07/17/2020	Compensation
Common	07/17/2020	Restricted stock vesting under a registered plan	Issuer			3470	07/17/2020	Compensation
Common	09/22/2020	Restricted stock vesting under a registered plan	Issuer			4111	09/22/2020	Compensation

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	05/21/2026
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/ Susan Lynn Heystee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)