Form 144: Insider 10b5-1 Sales and Option Exercise

Company Form 144 filing reports an insider sale notice for Common shares under multiple methods, including 10b5-1 programmed sales.

Rhea-AI Filing Summary

Company Form 144 filing reports an insider sale notice for Common shares under multiple methods, including 10b5-1 programmed sales. The filing lists an exercise of stock options for 52,775 shares and 83,659 restricted stock units (dated 03/11/2024), and multiple 10b5-1 sale executions between 03/12/2026 and 05/05/2026.

The excerpt shows several discrete 10b5-1 sales by Mark Frichtl, including 60,000, 40,000, and other share quantities with corresponding proceeds listed in dollars. The filing is an issuer-related sale notice; cash-flow treatment is the selling holder proceeds from reported transactions.

Insights

Corporate Governance Analyst

Routine insider resale pattern under a 10b5-1 plan; multiple executed sales are reported.

The filing lists repeated programmed sales attributed to Mark Frichtl on dated executions between 03/12/2026 and 05/05/2026. Each executed trade shows a share count and dollar proceeds, consistent with systematic dispositions.

The primary dependency is the existence of an active 10b5-1 plan; timing and amounts are set by that plan. Subsequent filings would show further executed blocks or cease activity if the plan ends.

Key Figures

Option exercise shares: 52,775 shares Restricted stock units: 83,659 shares 10b5-1 sale (05/05/2026): 13,451 shares +2 more

5 metrics

Option exercise shares 52,775 shares Exercise of Stock Options dated <date>05/13/2026</date>

Restricted stock units 83,659 shares Restricted Stock Units dated <date>03/11/2024</date>

10b5-1 sale (05/05/2026) 13,451 shares 10b5-1 Sale by Mark Frichtl on <date>05/05/2026</date>

10b5-1 sale (05/04/2026) 21,149 shares 10b5-1 Sale by Mark Frichtl on <date>05/04/2026</date>

Large 10b5-1 sale blocks 60,000 shares Reported 10b5-1 sales on <date>04/21/2026</date> and <date>04/20/2026</date>

Key Terms

10b5-1, Restricted Stock Units, Exercise of Stock Options

3 terms

10b5-1 regulatory

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

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.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | | | 83659 | 03/11/2024"

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.

Exercise of Stock Options financial

"Common | 05/13/2026 | Exercise of Stock Options | Issuer"

FAQ

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

What does OUST Form 144 show about insider activity?

The filing reports insider resale notices and executed 10b5-1 sales. It lists an option exercise of 52,775 shares and 83,659 RSUs, plus multiple 10b5-1 sale executions dated between 03/12/2026 and 05/05/2026.

Who executed the reported 10b5-1 sales in the filing?

The excerpt shows multiple programmed sales attributed to Mark Frichtl. Individual executed blocks and proceeds in dollars are listed for transactions dated from 03/12/2026 through 05/05/2026.

How many shares were exercised or covered by RSUs in this filing?

The filing lists an exercise of stock options for 52,775 shares and 83,659 restricted stock units dated 03/11/2024, presented as securities to be sold in the notice.

Are sale proceeds disclosed in the Form 144 excerpt?

Yes. Each reported 10b5-1 execution includes dollar proceeds alongside share counts, for example $637,160.15 for 21,149 shares on 05/04/2026 and other per-trade amounts listed in the excerpt.

Does this Form 144 indicate the sales were pre-arranged or discretionary?

The filing explicitly labels many entries as 10b5-1 Sales, indicating programmed, pre-arranged trading plans for those reported executions rather than ad hoc open-market sales.

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

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Accepted by SEC EDGAR 05/13/2026 - 04:21 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	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	136434	3697361.40	63672949	05/13/2026	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	05/13/2026	Exercise of Stock Options	Issuer			52775	05/13/2026	Cash
Common	03/11/2024	Restricted Stock Units	Issuer			83659	03/11/2024	N/A

* 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	05/05/2026	13451	403530.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/04/2026	21149	637160.15
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/22/2026	400	12000.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/21/2026	60000	1713861.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/20/2026	60000	1594806.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/17/2026	30000	754395.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/15/2026	20000	480000.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/14/2026	40000	910248.00
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	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 03/11/2024 through 12/11/2024.
Date of Notice	05/13/2026
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)