OUST insider files Rule 144 to sell 40,000 shares

OUST-related Rule 144 filing reports an intended sale of 40,000 common shares.

Rhea-AI Filing Summary

OUST-related Rule 144 filing reports an intended sale of 40,000 common shares. The filing states the shares are to be sold on 04/14/2026 via an exercise of stock options with cash proceeds. The notice also lists prior 10b5-1 dispositions by Mark Frichtl: 40,000 shares sold on 03/25/2026 for $837,576.00 and 15,689 shares sold on 03/12/2026 for $367,637.20.

Key Figures

Planned shares to be sold: 40,000 shares 10b5-1 sale — 03/25/2026: 40,000 shares 10b5-1 sale — 03/12/2026: 15,689 shares +1 more

4 metrics

Planned shares to be sold 40,000 shares to be sold on 04/14/2026 via exercise of stock options

10b5-1 sale — 03/25/2026 40,000 shares sold by Mark Frichtl on 03/25/2026 for $837,576.00

10b5-1 sale — 03/12/2026 15,689 shares sold by Mark Frichtl on 03/12/2026 for $367,637.20

Aggregate proceeds shown $1,205,213.20 aggregate of the two prior 10b5-1 sales listed (03/25 and 03/12/2026)

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options

3 terms

Rule 144 regulatory

"Securities To Be Sold / Securities Sold During The Past 3 Months"

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.

10b5-1 regulatory

"10b5-1 Sales for MARK FRICHTL 350 Treat Avenue"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Securities To Be Sold | Exercise of Stock Options"

FAQ

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

What does the OUST Rule 144 filing disclose about planned sales?

It discloses a planned sale of 40,000 common shares on 04/14/2026. The filing states the sale arises from an exercise of stock options and will be settled for cash, per the entry labeled "Securities To Be Sold."

What 10b5-1 sales are reported for OUST in the filing?

Two prior 10b5-1 sales by Mark Frichtl are listed. The filing shows 40,000 shares sold on 03/25/2026 for $837,576.00 and 15,689 shares sold on 03/12/2026 for $367,637.20.

Who is the reporting party named in the OUST filing?

Mark Frichtl is named as a seller in prior 10b5-1 transactions. The filing associates his name and address with the 03/25/2026 and 03/12/2026 dispositions recorded in the notice.

How were the planned shares to be settled according to the filing?

The planned 40,000-share transaction is described as an exercise of options settled for cash. The Securities To Be Sold row lists "Exercise of Stock Options" and indicates cash as the settlement method.

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

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Accepted by SEC EDGAR 04/14/2026 - 04:40 PM EDT 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	0001847596
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	MARK FRICHTL
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	40000	875200.00	62803991	04/14/2026	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	04/14/2026	Exercise of Stock Options	Issuer			40000	04/14/2026	Cash

* 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
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	03/25/2026	40000	837576.00
MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	03/12/2026	15689	367637.20

144: Remarks and Signature

Remarks
Date of Notice	04/14/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/15/2025
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/ Mark Frichtl
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)