SentinelOne officer plans sale of 8,143 shares

SentinelOne officer Robin Tomasello filed a Rule 144 notice to sell up to 8,143 shares, following recent 10b5-1 plan sales in the prior three months.

Rhea-AI Filing Summary

SentinelOne, Inc. (S) officer Robin Tomasello filed a notice of proposed sale of securities under Rule 144 for up to 8,143 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC. The shares relate to Restricted Stock Units and SentinelOne reported 342,184,493 shares outstanding as of September 10, 2026.

Over the prior three months, Tomasello reported sales of SentinelOne common stock, including 7,235 shares for $140,643.95 and 14,205 shares for $281,116.95 on September 8, 2026, and 5,467 shares for $109,799.23 on August 6, 2026, some of which were identified as 10b5-1 plan transactions.

Key Figures

Proposed shares to be sold: 8,143 shares Aggregate market value of proposed sale: $158,299.92 Shares outstanding: 342,184,493 shares +3 more

6 metrics

Proposed shares to be sold 8,143 shares Rule 144 notice for SentinelOne common stock

Aggregate market value of proposed sale $158,299.92 Value associated with 8,143 shares in the Rule 144 notice

Shares outstanding 342,184,493 shares SentinelOne common stock outstanding as of September 10, 2026

Sale on September 8, 2026 (10b5-1) 7,235 shares for $140,643.95 10b5-1 sales for Robin Tomasello

Additional sale on September 8, 2026 14,205 shares for $281,116.95 Common stock sale by Robin Tomasello

Sale on August 6, 2026 5,467 shares for $109,799.23 Common stock sale by Robin Tomasello in prior three months

Key Terms

Rule 144, Restricted Stock Units, 10b5-1

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

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.

Restricted Stock Units financial

"Common | 09/05/2026 | Restricted Stock Units | Issuer"

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.

10b5-1 regulatory

"10b5-1 Sales for ROBIN TOMASELLO 444 Castro Street"

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.

FAQ

What does SentinelOne (S) disclose in this Form 144 filing?

The filing states that officer Robin Tomasello filed a Rule 144 notice to potentially sell up to 8,143 shares of SentinelOne common stock, with Morgan Stanley Smith Barney LLC listed as the broker and the shares tied to Restricted Stock Units.

How many SentinelOne (S) shares are proposed to be sold by Robin Tomasello?

The notice covers a proposed sale of up to 8,143 shares of SentinelOne common stock. The aggregate market value for these shares is listed as $158,299.92 in the securities information section.

What were recent SentinelOne (S) stock sales by Robin Tomasello in the last three months?

Reported sales include 7,235 shares for $140,643.95 and 14,205 shares for $281,116.95 on September 8, 2026, and 5,467 shares for $109,799.23 on August 6, 2026. Some are identified as 10b5-1 plan sales.

How many SentinelOne (S) shares were outstanding as of the Form 144 reference date?

The filing lists 342,184,493 shares of SentinelOne common stock outstanding as of September 10, 2026. This figure provides context and is separate from the 8,143 shares covered by the proposed Rule 144 sale.

What type of security is being sold in this SentinelOne (S) Form 144?

The security is SentinelOne common stock, originating from Restricted Stock Units. The filing indicates the securities to be sold are RSU-related shares held for the account of officer Robin Tomasello under Rule 144.

Is the SentinelOne (S) Form 144 filing tied to a trading plan?

The section on past three months’ sales identifies certain transactions as 10b5-1 Sales for Robin Tomasello. The 8,143-share proposed sale itself is disclosed under Rule 144, with the broker listed as Morgan Stanley Smith Barney LLC.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/10/2026 - 04:38 PM Accepted by SEC EDGAR 09/10/2026 - 04:37 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	0001608511
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	SENTINELONE, INC.
SEC File Number	001-40531
Address of Issuer	444 Castro Street, Suite 400 Mountain View CALIFORNIA 94041
Phone	8558683733
Name of Person for Whose Account the Securities are To Be Sold	ROBIN TOMASELLO
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	8143	158299.92	342184493	09/10/2026	NYSE

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	09/05/2026	Restricted Stock Units	Issuer			8143	09/05/2026	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 ROBIN TOMASELLO 444 Castro Street, Suite 400 Mountain View CA 94041	Common	09/08/2026	7235	140643.95
ROBIN TOMASELLO 444 Castro Street, Suite 400 Mountain View CA 94041	Common	09/08/2026	14205	281116.95
ROBIN TOMASELLO 444 Castro Street, Suite 400 Mountain View CA 94041	Common	08/06/2026	5467	109799.23

144: Remarks and Signature

Remarks
Date of Notice	09/10/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/09/2026
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/ Robin Tomasello
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)