Ouster holder plans sale of 30,000 shares

Darien R. Spencer filed to permit the sale of up to 30,000 shares of Ouster, Inc. common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on or after August 4, 2026 on NASDAQ.

Rhea-AI Filing Summary

Darien R. Spencer filed to permit the sale of up to 30,000 shares of Ouster, Inc. common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on or after August 4, 2026 on NASDAQ. These shares are restricted stock acquired from the issuer on December 11, 2023. The filing lists an aggregate market value of approximately $1,350,000.00 for the planned sale. In the preceding three months, Spencer sold 30,001 shares for $1,350,045.00 on May 26, 2026 and 12,559 shares for $487,579.64 on June 12, 2026.

Key Figures

Planned shares to be sold: 30,000 shares Aggregate market value of planned sale: $1,350,000.00 Past sale on May 26, 2026: 30,001 shares for $1,350,045.00 +3 more

6 metrics

Planned shares to be sold 30,000 shares Common stock planned for sale on or after August 4, 2026

Aggregate market value of planned sale $1,350,000.00 Estimated value of 30,000 Ouster common shares

Past sale on May 26, 2026 30,001 shares for $1,350,045.00 Common stock sold during the past three months

Past sale on June 12, 2026 12,559 shares for $487,579.64 Common stock sold during the past three months

Acquisition date of restricted stock December 11, 2023 Date restricted stock to be sold was acquired from issuer

Planned sale date August 4, 2026 Date from which sale of 30,000 shares may occur

Key Terms

Form 144, restricted stock, aggregate market value, Executive Financial Services

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

restricted stock financial

"Common | 12/11/2023 | Restricted Stock | Issuer"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

aggregate market value financial

"| 30000 | 1350000.00 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

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

What does the Form 144 filing for OUST disclose about planned stock sales?

The filing shows Darien R. Spencer plans to sell up to 30,000 shares of Ouster common stock, with an aggregate market value of $1,350,000.00, through Morgan Stanley Smith Barney LLC Executive Financial Services on or after August 4, 2026.

What type of OUST shares are covered by Darien R. Spencer’s planned sale?

The planned sale covers restricted stock in Ouster common shares. These 30,000 shares were acquired from the issuer on December 11, 2023, and are being registered for potential sale on NASDAQ via Morgan Stanley Smith Barney LLC Executive Financial Services.

What past OUST stock sales by Darien R. Spencer are reported in this Form 144?

The filing reports two recent sales: 30,001 shares of Ouster common stock for $1,350,045.00 on May 26, 2026, and 12,559 shares for $487,579.64 on June 12, 2026, both listed under securities sold during the past three months.

On which market is the planned OUST share sale by Darien R. Spencer expected to occur?

The shares are indicated for potential sale on the NASDAQ market. The Form 144 specifies that up to 30,000 Ouster common shares may be sold there through Morgan Stanley Smith Barney LLC Executive Financial Services beginning on or after August 4, 2026.

Who is the broker handling Darien R. Spencer’s planned sale of OUST shares?

The planned transaction is to be handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, for the potential sale of 30,000 Ouster common shares on NASDAQ.

How does the planned OUST share sale compare to Darien R. Spencer’s recent transactions?

Beyond the planned 30,000-share sale valued at $1,350,000.00, Spencer recently sold 30,001 shares for $1,350,045.00 on May 26, 2026 and 12,559 shares for $487,579.64 on June 12, 2026, as disclosed in the filing.

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

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Available on EDGAR 08/04/2026 - 04:19 PM Accepted by SEC EDGAR 08/04/2026 - 04:18 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	0001226378
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	DARIEN R SPENCER
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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	30000	1350000.00	63672949	08/04/2026	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	12/11/2023	Restricted Stock	Issuer			30000	12/11/2023	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
DARIEN R SPENCER 350 Treat Avenue San Francisco CA 94110	Common	06/12/2026	12559	487579.64
DARIEN R SPENCER 350 Treat Avenue San Francisco CA 94110	Common	05/26/2026	30001	1350045.00

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of Restricted Stock during the period of 12/11/2023 through 12/11/2024
Date of Notice	08/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/18/2025
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/ Darien Raymond Spencer
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)