Sec Form 4 Filing - HACKETT PATRICK T @ Outset Medical, Inc. - 2025-03-07

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person HACKETT PATRICK T 2. Issuer Name and Ticker or Trading Symbol Outset Medical, Inc. [ OM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 3052 ORCHARD DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 03/07/2025 (Street) SAN JOSE, CA95134 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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) Code V Amount (A) or (D) Price Common Stock 03/10/2025 M 1,250,000 A 1,292,849 D Common Stock 03/10/2025 M 1,250,000 A 1,250,000 I GST Trust Common Stock 03/10/2025 M 625,000 A 625,000 I Hackett Family Fund

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/07/2025 A 5,000 03/10/2025( 2 ) ( 2 ) Preferred Stock 5,000 $ 200 ( 2 ) 5,000 D Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/10/2025 M 5,000 03/10/2025( 2 ) ( 2 ) Preferred Stock 5,000 $ 0 ( 2 ) 0 D Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/07/2025 A 5,000 03/10/2025( 2 ) ( 2 ) Preferred Stock 5,000 $ 200 ( 2 ) 5,000 I GST Trust Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/10/2025 M 5,000 03/10/2025( 2 ) ( 2 ) Preferred Stock 5,000 ( 2 ) 0 I GST Trust Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/07/2025 A 2,500 03/10/2025( 2 ) ( 2 ) Preferred Stock 2,500 $ 200 ( 2 ) 2,500 I Hackett Family Fund Series A Non-Voting Convertible Preferred $ 0 ( 2 ) 03/10/2025 M 2,500 03/10/2025( 2 ) ( 2 ) Preferred Stock 2,500 $ 0 ( 2 ) 0 I Hackett Family Fund

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other HACKETT PATRICK T 3052 ORCHARD DRIVE SAN JOSE, CA95134 X Signatures By: John L Brottem For: Patrick T Hackett 03/11/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Issuer's stockholders approved the conversion of shares of the Issuer's Series A Non-Voting Convertible Preferred Stock ("Preferred Stock") into shares of the Issuer's common stock ("Common Stock") at its Meeting of Stockholders, held on March 5, 2025, after which each share of Preferred Stock automatically converted into 250 shares of Common Stock on March 10, 2025. ( 2 )These shares of Series A Non-Voting Convertible Preferred Stock ("Preferred Stock") were issued to the Reporting Person under securities purchase agreements entered into with the Issuer, pursuant to which the Issuer agreed to submit to its stockholders the approval of the conversion of the Preferred Stock into shares of Common Stock at its March 5, 2025 Meeting of Stockholders (the "Conversion Proposal"). The Issuer's stockholders approved the Conversion Proposal and each share of Preferred Stock will automatically convert into 250 shares of Common Stock, subject to certain limitations. The Preferred Stock has no expiration 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).

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