OUST Form 144: Affiliate Sells 40,000 Shares

Company notice: an affiliate reported proposed and recent sales of common stock under Rule 144/10b5-1 arrangements.

Rhea-AI Filing Summary

Company notice: an affiliate reported proposed and recent sales of common stock under Rule 144/10b5-1 arrangements. The filing lists an exercise-and-sale of 40,000 shares on 05/14/2026 and multiple 10b5-1 dispositions, including 136,434 shares sold on 05/13/2026.

Insights

Securities Compliance Analyst

Routine Rule 144/10b5-1 dispositions by an affiliate; timing and amounts are disclosed.

The filing lists a proposed sale of 40,000 shares on 05/14/2026 via an exercise of stock options and multiple completed 10b5-1 sales, the largest shown being 136,434 shares on 05/13/2026.

These entries are transactional disclosures under resale rules; cash-flow treatment is explicit where shown (cash proceeds per sale lines). Subsequent SEC reports or settlement confirmations may provide final disposition details.

Key Figures

Proposed sale from option exercise: 40,000 shares 10b5-1 sale (largest shown): 136,434 shares Proceeds reported for 05/13/2026 trade: $4,442,371.08 +2 more

5 metrics

Proposed sale from option exercise 40,000 shares exercise of stock options on 05/14/2026

10b5-1 sale (largest shown) 136,434 shares sale on 05/13/2026

Proceeds reported for 05/13/2026 trade <money>$4,442,371.08</money> proceeds tied to the 136,434-share sale on 05/13/2026

Other 10b5-1 sale examples 60,000 shares; 30,000 shares; 40,000 shares sales on 04/21/2026, 04/17/2026, 03/25/2026 respectively

Proceeds example for 04/21/2026 <money>$1,713,861.00</money> proceeds for 60,000 shares sold on 04/21/2026

Key Terms

10b5-1, Form 144, exercise of stock options

3 terms

10b5-1 regulatory

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

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.

Form 144 regulatory

"144: Filer Information"

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.

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 did the Form 144 for OUST disclose about insider sales?

The filing discloses proposed and completed sales of common stock, including 40,000 shares on 05/14/2026. It also lists multiple 10b5-1 sales, notably 136,434 shares sold on 05/13/2026, with per-trade proceeds shown.

Who is the reporting party on the OUST Form 144?

The filing identifies sales associated with Mark Frichtl and Morgan Stanley Smith Barney LLC as broker. Several 10b5-1 sale lines list Mark Frichtl's address and sale dates with share counts and cash amounts.

Did the Form 144 report option exercises for OUST?

Yes. The filing lists an exercise of stock options resulting in 40,000 shares to be sold on 05/14/2026 with cash indicated as the method of payment. The line labels the transaction as an issuer exercise.

How much cash was reported for the largest 10b5-1 sale in the filing?

The largest single 10b5-1 sale shown is 136,434 shares on 05/13/2026, with proceeds listed as $4,442,371.08 in the filing's sale line for that trade.

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

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Accepted by SEC EDGAR 05/14/2026 - 04:25 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	40000	1366800.00	63672949	05/14/2026	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	05/14/2026	Exercise of Stock Options	Issuer			40000	05/14/2026	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	05/13/2026	136434	4442371.08
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
Date of Notice	05/14/2026
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)