Intuitive Surgical officer plans $254K stock sale

Form 144 reports an officer’s planned sale of 694 ISRG shares under Rule 144, following prior small 10b5-1 sales.

Rhea-AI Filing Summary

INTUITIVE SURGICAL INC (ISRG) received a Rule 144 notice covering a planned sale of its common stock by officer Mark Preston Brosius. The notice relates to 694 shares of common stock held in an account at Morgan Stanley Smith Barney, with an aggregate market value of $254,489.80 as of September 8, 2026.

The shares derive from performance stock units awarded by the issuer, with a grant date of February 28, 2026. The notice also lists prior Rule 10b5-1 plan sales of ISRG common stock by Brosius over the past three months in small increments.

Key Figures

Shares to be sold under Rule 144: 694 shares Aggregate market value of shares to be sold: $254,489.80 Company share count referenced: 353,278,000 shares +3 more

6 metrics

Shares to be sold under Rule 144 694 shares Planned sale of INTUITIVE SURGICAL INC common stock reported for September 8, 2026

Aggregate market value of shares to be sold $254,489.80 Value of 694 ISRG shares referenced in the Rule 144 notice as of September 8, 2026

Company share count referenced 353,278,000 shares INTUITIVE SURGICAL INC common shares referenced in the securities information section dated September 8, 2026

Sale on August 21, 2026 77 shares for $28,918.89 Rule 10b5-1 sale of ISRG common stock by Mark Brosius during the past three months

Sale on July 31, 2026 28 shares for $9,828.00 Rule 10b5-1 sale of ISRG common stock by Mark Brosius

Sale on June 12, 2026 25 shares for $10,353.25 Rule 10b5-1 sale of ISRG common stock by Mark Brosius

Key Terms

Rule 144, Form 144, Performance Stock Units, Rule 10b5-1

4 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.

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.

Performance Stock Units financial

"Common | 02/28/2026 | Performance Stock Units | Issuer"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Rule 10b5-1 regulatory

"10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

What does the Form 144 filing for ISRG disclose about Mark Brosius’s planned sale?

It discloses a planned sale under Rule 144 by officer Mark Preston Brosius of 694 shares of INTUITIVE SURGICAL INC common stock, held at Morgan Stanley Smith Barney, with an aggregate market value of $254,489.80 based on market prices on September 8, 2026.

How many ISRG shares are covered by this Rule 144 notice?

The notice covers 694 shares of INTUITIVE SURGICAL INC common stock, with an indicated aggregate market value of $254,489.80 as of September 8, 2026, held through Morgan Stanley Smith Barney Executive Financial Services.

What is the source of the ISRG shares being sold by Mark Brosius?

The shares are tied to performance stock units granted by INTUITIVE SURGICAL INC, with a grant date of February 28, 2026. The Form 144 identifies the issuer as the source of these securities.

What ISRG share count is referenced as outstanding in this Form 144?

The filing references 353,278,000 shares of INTUITIVE SURGICAL INC common stock, in connection with the securities information section dated September 8, 2026. This figure appears as a company share count context for the notice.

What prior ISRG sales by Mark Brosius are listed in the last three months?

The filing lists multiple small Rule 10b5-1 sales of ISRG common stock, including 77 shares sold on August 21, 2026 for $28,918.89 and 25 shares sold on June 12, 2026 for $10,353.25, among other similar transactions.

Which broker is involved in the ISRG shares covered by this Form 144?

The shares are held through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as stated in the securities information section.

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

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Available on EDGAR 09/08/2026 - 04:31 PM EDT Accepted by SEC EDGAR 09/08/2026 - 04:29 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	0002010300
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	INTUITIVE SURGICAL INC
SEC File Number	000-30713
Address of Issuer	1020 Kifer Road Sunnyvale CALIFORNIA 94086
Phone	4085232100
Name of Person for Whose Account the Securities are To Be Sold	MARK BROSIUS
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	694	254489.80	353278000	09/08/2026	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	02/28/2026	Performance Stock Units	Issuer			694	02/28/2026	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 MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	08/21/2026	77	28918.89
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	08/20/2026	77	30520.49
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	08/19/2026	77	30358.02
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	08/18/2026	77	30338.00
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	08/17/2026	77	30081.59
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	07/31/2026	28	9828.00
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	07/30/2026	28	9711.24
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	07/29/2026	28	10085.88
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	07/28/2026	28	10236.24
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	07/27/2026	28	9632.00
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	06/12/2026	25	10353.25
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	06/11/2026	23	9479.68
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	06/10/2026	23	9755.22
10b5-1 Sales for MARK BROSIUS 1020 Kifer Road Sunnyvale CA 94086	Common	06/09/2026	23	9685.99

144: Remarks and Signature

Remarks
Date of Notice	09/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/12/2025
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 Preston Brosius
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)