Intuitive Surgical (NASDAQ: ISRG) EVP sells 54 shares via Rule 10b5-1 plan

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Intuitive Surgical EVP & Chief Manufacturing and Supply Chain officer Mark Brosius reported small open-market sales of company common stock. Over three days, he sold 18 shares on each of May 18, May 19, and May 20, 2026 at prices of $422.47, $440.70, and $440.38 per share.

After these sales totaling 54 shares, Brosius directly holds 1,559 shares of Intuitive Surgical common stock. The filing notes that the transactions were executed under a pre-arranged Trading Plan that complies with SEC Rule 10b5-1 and runs through February 14, 2027, indicating they were scheduled in advance rather than discretionary trades.

Insights

Small pre-planned insider sales with modest impact.

Executive vice president Mark Brosius sold a total of 54 shares of Intuitive Surgical common stock through three small open-market transactions between May 18 and May 20, 2026, at prices around $422–$441 per share.

Following these sales, he still directly holds 1,559 shares, so the transactions represent a limited portion of his reported equity position. The filing specifies that the trades occurred under a Trading Plan that complies with SEC Rule 10b5-1 and expires on February 14, 2027, suggesting they were scheduled in advance as part of a systematic diversification or liquidity strategy.

Because the amounts are small and executed under a pre-arranged plan, the informational value of the timing is low, and the transactions appear routine rather than a strong signal about management’s view of Intuitive Surgical’s prospects.

Insider Trade Summary 10b5-1

Net Seller: 54 shares ($23,464)

Net Sell 3 txns

Insider Brosius Mark

Role EVP & Chief Mfg and Supply Cha

Sold 54 shs ($23K)

Type	Security	Shares	Price	Value
Sale	Common Stock	18	$440.38	$8K
Sale	Common Stock	18	$440.70	$8K
Sale	Common Stock	18	$422.47	$8K

Holdings After Transaction: Common Stock — 1,559 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold May 20, 2026: 18 shares at $440.38 Shares sold May 19, 2026: 18 shares at $440.70 Shares sold May 18, 2026: 18 shares at $422.47 +3 more

6 metrics

Shares sold May 20, 2026 18 shares at $440.38 Open-market sale of common stock

Shares sold May 19, 2026 18 shares at $440.70 Open-market sale of common stock

Shares sold May 18, 2026 18 shares at $422.47 Open-market sale of common stock

Total shares sold 54 shares Net insider sales across three days

Shares held after transactions 1,559 shares Direct holdings after May 20, 2026 sale

10b5-1 plan expiry February 14, 2027 End date of pre-arranged trading plan

Key Terms

Rule 10b5-1, Trading Plan, open-market sale, Form 4

4 terms

Rule 10b5-1 regulatory

"a Trading Plan that complies with SEC Rule 10b5-1 and expires on February 14, 2027"

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.

Trading Plan financial

"The transaction took place in accordance with a Trading Plan that complies with SEC Rule 10b5-1"

A trading plan is a written set of rules an investor follows about what to buy or sell, when to enter and exit positions, and how much risk to accept—like a travel itinerary that maps the route, stops, and budget before a trip. It matters because it helps remove emotional decisions during market swings, enforces discipline, and makes performance easier to review and improve, reducing the chance of costly impulsive moves.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

05/20/2026 - 06:02 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brosius Mark

(Last)

(First)

(Middle)

1020 KIFER ROAD

(Street)

SUNNYVALE

CALIFORNIA

94086

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
INTUITIVE SURGICAL INC [ ISRG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP & Chief Mfg and Supply Cha

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/18/2026		S⁽¹⁾		18	D	$422.47	1,595	D
Common Stock	05/19/2026		S⁽¹⁾		18	D	$440.7	1,577	D
Common Stock	05/20/2026		S⁽¹⁾		18	D	$440.38	1,559	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The transaction took place in accordance with a Trading Plan that complies with SEC Rule 10b5-1 and expires on February 14, 2027.

	By: Stephanie Lim-Ignacio For: Brosius, Mark	05/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did ISRG executive Mark Brosius report?

Mark Brosius reported three small open-market sales totaling 54 shares of Intuitive Surgical common stock. He sold 18 shares on each of May 18, 19, and 20, 2026, at prices between $422.47 and $440.70 per share, according to the Form 4 filing.

At what prices did ISRG shares sell in Mark Brosius’s recent trades?

Brosius sold Intuitive Surgical common stock at prices of $422.47, $440.70, and $440.38 per share. Each transaction involved 18 shares, executed on May 18, 19, and 20, 2026, respectively, reflecting modest, pre-planned sales rather than large discretionary trades.

How many ISRG shares does Mark Brosius hold after these Form 4 sales?

After the reported sales, Mark Brosius directly holds 1,559 shares of Intuitive Surgical common stock. Before selling the 54 shares across the three days, his direct holdings were slightly higher, so the transactions reduced but did not significantly change his reported equity position.

Were Mark Brosius’s ISRG stock sales made under a Rule 10b5-1 plan?

Yes. The Form 4 footnote states the transactions occurred under a Trading Plan that complies with SEC Rule 10b5-1. The plan remains in effect until February 14, 2027, indicating these sales were pre-arranged rather than timed in response to short-term market developments.

What is the significance of Rule 10b5-1 for ISRG insider stock sales?

A Rule 10b5-1 Trading Plan allows insiders to schedule trades in advance, helping separate routine portfolio management from opportunistic trading. For Intuitive Surgical, Brosius’s sales under such a plan suggest a structured approach to selling shares, reducing the signaling impact of trade timing.